fourierdlem112 - Mathbox for Glauco Siliprandi

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Theorem fourierdlem112 47364

Description: Here abbreviations (local definitions) are introduced to prove the fourier 47371 theorem. (𝑍‘𝑚) is the m_th partial sum of the fourier series. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypotheses**
Ref	Expression
fourierdlem112.f	⊢ (𝜑 → 𝐹:ℝ⟶ℝ)
fourierdlem112.d	⊢ 𝐷 = (𝑚 ∈ ℕ ↦ (𝑦 ∈ ℝ ↦ if((𝑦 mod (2 · π)) = 0, (((2 · 𝑚) + 1) / (2 · π)), ((sin‘((𝑚 + (1 / 2)) · 𝑦)) / ((2 · π) · (sin‘(𝑦 / 2)))))))
fourierdlem112.p	⊢ 𝑃 = (𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))})
fourierdlem112.m	⊢ (𝜑 → 𝑀 ∈ ℕ)
fourierdlem112.q	⊢ (𝜑 → 𝑄 ∈ (𝑃‘𝑀))
fourierdlem112.n	⊢ 𝑁 = ((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)
fourierdlem112.v	⊢ 𝑉 = (℩𝑓𝑓 Isom < , < ((0...𝑁), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})))
fourierdlem112.x	⊢ (𝜑 → 𝑋 ∈ ℝ)
fourierdlem112.xran	⊢ (𝜑 → 𝑋 ∈ ran 𝑉)
fourierdlem112.t	⊢ 𝑇 = (2 · π)
fourierdlem112.fper	⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → (𝐹‘(𝑥 + 𝑇)) = (𝐹‘𝑥))
fourierdlem112.fcn	⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → (𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) ∈ (((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))–cn→ℂ))
fourierdlem112.c	⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → 𝐶 ∈ ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘𝑖)))
fourierdlem112.u	⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → 𝑈 ∈ ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘(𝑖 + 1))))
fourierdlem112.fdvcn	⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → ((ℝ D 𝐹) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) ∈ (((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))–cn→ℂ))
fourierdlem112.e	⊢ (𝜑 → 𝐸 ∈ (((ℝ D 𝐹) ↾ (-∞(,)𝑋)) lim_ℂ 𝑋))
fourierdlem112.i	⊢ (𝜑 → 𝐼 ∈ (((ℝ D 𝐹) ↾ (𝑋(,)+∞)) lim_ℂ 𝑋))
fourierdlem112.l	⊢ (𝜑 → 𝐿 ∈ ((𝐹 ↾ (-∞(,)𝑋)) lim_ℂ 𝑋))
fourierdlem112.r	⊢ (𝜑 → 𝑅 ∈ ((𝐹 ↾ (𝑋(,)+∞)) lim_ℂ 𝑋))
fourierdlem112.a	⊢ 𝐴 = (𝑛 ∈ ℕ₀ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) d𝑥 / π))
fourierdlem112.b	⊢ 𝐵 = (𝑛 ∈ ℕ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (sin‘(𝑛 · 𝑥))) d𝑥 / π))
fourierdlem112.z	⊢ 𝑍 = (𝑚 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))))
fourierdlem112.23	⊢ 𝑆 = (𝑛 ∈ ℕ ↦ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))
fourierdlem112.fbd	⊢ (𝜑 → ∃𝑤 ∈ ℝ ∀𝑡 ∈ ℝ (abs‘(𝐹‘𝑡)) ≤ 𝑤)
fourierdlem112.fdvbd	⊢ (𝜑 → ∃𝑧 ∈ ℝ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧)
fourierdlem112.25	⊢ (𝜑 → 𝑋 ∈ ℝ)

**Assertion**
Ref	Expression
fourierdlem112	⊢ (𝜑 → (seq1( + , 𝑆) ⇝ (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2)) ∧ (((𝐴‘0) / 2) + Σ𝑛 ∈ ℕ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) = ((𝐿 + 𝑅) / 2)))

Distinct variable groups: 𝐴,𝑘,𝑚,𝑛 𝑡,𝑅,𝑧 𝑧,𝑋 𝑡,𝑁,𝑤,𝑧 𝜑,𝑓,𝑥,𝑦 𝑖,𝑁,𝑚,𝑤 𝐶,𝑚,𝑥 𝑄,𝑓,𝑖,𝑡,𝑦 𝑓,𝑀,𝑚,𝑥 𝑡,𝐿 𝑥,𝑉 𝑤,𝐿,𝑧 𝑚,𝑍 𝑛,𝑉,𝑝 𝑅,𝑘,𝑛 𝑤,𝐹 𝑛,𝑋,𝑝 𝑡,𝑚 𝑥,𝑋 𝐷,𝑖,𝑘,𝑚,𝑛,𝑥,𝑦 𝑈,𝑚,𝑥 𝑘,𝐹,𝑡,𝑧 𝑖,𝑀,𝑛,𝑝,𝑦 𝑛,𝑁,𝑝 𝑖,𝐹,𝑚,𝑛,𝑥,𝑦 𝐵,𝑘,𝑚,𝑛 𝑇,𝑛,𝑝,𝑦,𝑖 𝑖,𝑉,𝑤,𝑧 𝜑,𝑚,𝑛 𝑓,𝑁,𝑦 𝑡,𝐶 𝑓,𝑉,𝑘,𝑚,𝑡 𝑡,𝑀 𝜑,𝑘 𝑇,𝑘,𝑚,𝑥,𝑓 𝑡,𝑇 𝑅,𝑖,𝑚,𝑤 𝑄,𝑚,𝑛,𝑥 𝑥,𝑁 𝑓,𝑋,𝑘,𝑦 𝑄,𝑘,𝑝 𝑡,𝑈 𝑖,𝑋,𝑚,𝑡,𝑤,𝑧 𝜑,𝑖,𝑡,𝑤,𝑧 𝑖,𝐿,𝑘,𝑚,𝑛 Allowed substitution hints: 𝜑(𝑝) 𝐴(𝑥, 𝑦, 𝑧, 𝑤, 𝑡, 𝑓, 𝑖, 𝑝) 𝐵(𝑥, 𝑦, 𝑧, 𝑤, 𝑡, 𝑓, 𝑖, 𝑝) 𝐶(𝑦, 𝑧, 𝑤, 𝑓, 𝑖, 𝑘, 𝑛, 𝑝) 𝐷(𝑧, 𝑤, 𝑡, 𝑓, 𝑝) 𝑃(𝑥, 𝑦, 𝑧, 𝑤, 𝑡, 𝑓, 𝑖, 𝑘, 𝑚, 𝑛, 𝑝) 𝑄(𝑧, 𝑤) 𝑅(𝑥, 𝑦, 𝑓, 𝑝) 𝑆(𝑥, 𝑦, 𝑧, 𝑤, 𝑡, 𝑓, 𝑖, 𝑘, 𝑚, 𝑛, 𝑝) 𝑇(𝑧, 𝑤) 𝑈(𝑦, 𝑧, 𝑤, 𝑓, 𝑖, 𝑘, 𝑛, 𝑝) 𝐸(𝑥, 𝑦, 𝑧, 𝑤, 𝑡, 𝑓, 𝑖, 𝑘, 𝑚, 𝑛, 𝑝) 𝐹(𝑓, 𝑝) 𝐼(𝑥, 𝑦, 𝑧, 𝑤, 𝑡, 𝑓, 𝑖, 𝑘, 𝑚, 𝑛, 𝑝) 𝐿(𝑥, 𝑦, 𝑓, 𝑝) 𝑀(𝑧, 𝑤, 𝑘) 𝑁(𝑘) 𝑉(𝑦) 𝑍(𝑥, 𝑦, 𝑧, 𝑤, 𝑡, 𝑓, 𝑖, 𝑘, 𝑛, 𝑝)

Proof of Theorem fourierdlem112 Dummy variables 𝑗 𝑙 𝑎 𝑐 𝑟 𝑠 𝑒 𝑞 𝑏 𝑢 ℎ 𝑔 𝑣 𝑜 𝑑 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		fourierdlem112.23	. . . . 5 ⊢ 𝑆 = (𝑛 ∈ ℕ ↦ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))
2		fveq2 6890	. . . . . . . 8 ⊢ (𝑛 = 𝑗 → (𝐴‘𝑛) = (𝐴‘𝑗))
3		oveq1 7431	. . . . . . . . 9 ⊢ (𝑛 = 𝑗 → (𝑛 · 𝑋) = (𝑗 · 𝑋))
4	3	fveq2d 6894	. . . . . . . 8 ⊢ (𝑛 = 𝑗 → (cos‘(𝑛 · 𝑋)) = (cos‘(𝑗 · 𝑋)))
5	2, 4	oveq12d 7442	. . . . . . 7 ⊢ (𝑛 = 𝑗 → ((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) = ((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))))
6		fveq2 6890	. . . . . . . 8 ⊢ (𝑛 = 𝑗 → (𝐵‘𝑛) = (𝐵‘𝑗))
7	3	fveq2d 6894	. . . . . . . 8 ⊢ (𝑛 = 𝑗 → (sin‘(𝑛 · 𝑋)) = (sin‘(𝑗 · 𝑋)))
8	6, 7	oveq12d 7442	. . . . . . 7 ⊢ (𝑛 = 𝑗 → ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))) = ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))
9	5, 8	oveq12d 7442	. . . . . 6 ⊢ (𝑛 = 𝑗 → (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))) = (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))
10	9	cbvmptv 5208	. . . . 5 ⊢ (𝑛 ∈ ℕ ↦ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) = (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))
11	1, 10	eqtri 2783	. . . 4 ⊢ 𝑆 = (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))
12		seqeq3 14156	. . . 4 ⊢ (𝑆 = (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))) → seq1( + , 𝑆) = seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))))
13	11, 12	mp1i 14	. . 3 ⊢ (𝜑 → seq1( + , 𝑆) = seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))))
14		nnuz 13011	. . . . 5 ⊢ ℕ = (ℤ_≥‘1)
15		1zzd 12734	. . . . 5 ⊢ (𝜑 → 1 ∈ ℤ)
16		nfv 1946	. . . . . . 7 ⊢ Ⅎ𝑛𝜑
17		nfcv 2922	. . . . . . . 8 ⊢ Ⅎ𝑛ℕ
18		nfcv 2922	. . . . . . . . 9 ⊢ Ⅎ𝑛( -π(,)0)
19		nfcv 2922	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝐹‘(𝑋 + 𝑠))
20		nfcv 2922	. . . . . . . . . 10 ⊢ Ⅎ𝑛 ·
21		nfcv 2922	. . . . . . . . . 10 ⊢ Ⅎ𝑛((𝐷‘𝑚)‘𝑠)
22	19, 20, 21	nfov 7454	. . . . . . . . 9 ⊢ Ⅎ𝑛((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠))
23	18, 22	nfitg 26104	. . . . . . . 8 ⊢ Ⅎ𝑛∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠
24	17, 23	nfmpt 5202	. . . . . . 7 ⊢ Ⅎ𝑛(𝑚 ∈ ℕ ↦ ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)
25		nfcv 2922	. . . . . . . . 9 ⊢ Ⅎ𝑛(0(,)π)
26	25, 22	nfitg 26104	. . . . . . . 8 ⊢ Ⅎ𝑛∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠
27	17, 26	nfmpt 5202	. . . . . . 7 ⊢ Ⅎ𝑛(𝑚 ∈ ℕ ↦ ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)
28		fourierdlem112.z	. . . . . . . 8 ⊢ 𝑍 = (𝑚 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))))
29		fourierdlem112.a	. . . . . . . . . . . . 13 ⊢ 𝐴 = (𝑛 ∈ ℕ₀ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) d𝑥 / π))
30		nfmpt1 5203	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑛(𝑛 ∈ ℕ₀ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) d𝑥 / π))
31	29, 30	nfcxfr 2920	. . . . . . . . . . . 12 ⊢ Ⅎ𝑛𝐴
32		nfcv 2922	. . . . . . . . . . . 12 ⊢ Ⅎ𝑛0
33	31, 32	nffv 6900	. . . . . . . . . . 11 ⊢ Ⅎ𝑛(𝐴‘0)
34		nfcv 2922	. . . . . . . . . . 11 ⊢ Ⅎ𝑛 /
35		nfcv 2922	. . . . . . . . . . 11 ⊢ Ⅎ𝑛2
36	33, 34, 35	nfov 7454	. . . . . . . . . 10 ⊢ Ⅎ𝑛((𝐴‘0) / 2)
37		nfcv 2922	. . . . . . . . . 10 ⊢ Ⅎ𝑛 +
38		nfcv 2922	. . . . . . . . . . 11 ⊢ Ⅎ𝑛(1...𝑚)
39	38	nfsum1 15866	. . . . . . . . . 10 ⊢ Ⅎ𝑛Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))
40	36, 37, 39	nfov 7454	. . . . . . . . 9 ⊢ Ⅎ𝑛(((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))
41	17, 40	nfmpt 5202	. . . . . . . 8 ⊢ Ⅎ𝑛(𝑚 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))))
42	28, 41	nfcxfr 2920	. . . . . . 7 ⊢ Ⅎ𝑛𝑍
43		fourierdlem112.f	. . . . . . . 8 ⊢ (𝜑 → 𝐹:ℝ⟶ℝ)
44		fourierdlem112.25	. . . . . . . 8 ⊢ (𝜑 → 𝑋 ∈ ℝ)
45		eqid 2760	. . . . . . . 8 ⊢ (𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = ( -π + 𝑋) ∧ (𝑝‘𝑛) = (π + 𝑋)) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))}) = (𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = ( -π + 𝑋) ∧ (𝑝‘𝑛) = (π + 𝑋)) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))})
46		picn 26794	. . . . . . . . . . . . 13 ⊢ π ∈ ℂ
47	46	2timesi 12487	. . . . . . . . . . . 12 ⊢ (2 · π) = (π + π)
48		fourierdlem112.t	. . . . . . . . . . . 12 ⊢ 𝑇 = (2 · π)
49	46, 46	subnegi 11644	. . . . . . . . . . . 12 ⊢ (π − -π) = (π + π)
50	47, 48, 49	3eqtr4i 2793	. . . . . . . . . . 11 ⊢ 𝑇 = (π − -π)
51		fourierdlem112.p	. . . . . . . . . . 11 ⊢ 𝑃 = (𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))})
52		fourierdlem112.m	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑀 ∈ ℕ)
53		fourierdlem112.q	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑄 ∈ (𝑃‘𝑀))
54		pire 26792	. . . . . . . . . . . . . 14 ⊢ π ∈ ℝ
55	54	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝜑 → π ∈ ℝ)
56	55	renegcld 11750	. . . . . . . . . . . 12 ⊢ (𝜑 → -π ∈ ℝ)
57	56, 44	readdcld 11345	. . . . . . . . . . 11 ⊢ (𝜑 → ( -π + 𝑋) ∈ ℝ)
58	55, 44	readdcld 11345	. . . . . . . . . . 11 ⊢ (𝜑 → (π + 𝑋) ∈ ℝ)
59		negpilt0 46433	. . . . . . . . . . . . . 14 ⊢ -π < 0
60		pipos 26796	. . . . . . . . . . . . . 14 ⊢ 0 < π
61	54	renegcli 11626	. . . . . . . . . . . . . . 15 ⊢ -π ∈ ℝ
62		0re 11317	. . . . . . . . . . . . . . 15 ⊢ 0 ∈ ℝ
63	61, 62, 54	lttri 11443	. . . . . . . . . . . . . 14 ⊢ (( -π < 0 ∧ 0 < π) → -π < π)
64	59, 60, 63	mp2an 705	. . . . . . . . . . . . 13 ⊢ -π < π
65	64	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → -π < π)
66	56, 55, 44, 65	ltadd1dd 11934	. . . . . . . . . . 11 ⊢ (𝜑 → ( -π + 𝑋) < (π + 𝑋))
67		oveq1 7431	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = 𝑥 → (𝑦 + (𝑘 · 𝑇)) = (𝑥 + (𝑘 · 𝑇)))
68	67	eleq1d 2845	. . . . . . . . . . . . . 14 ⊢ (𝑦 = 𝑥 → ((𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄 ↔ (𝑥 + (𝑘 · 𝑇)) ∈ ran 𝑄))
69	68	rexbidv 3186	. . . . . . . . . . . . 13 ⊢ (𝑦 = 𝑥 → (∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄 ↔ ∃𝑘 ∈ ℤ (𝑥 + (𝑘 · 𝑇)) ∈ ran 𝑄))
70	69	cbvrabv 3422	. . . . . . . . . . . 12 ⊢ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄} = {𝑥 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑥 + (𝑘 · 𝑇)) ∈ ran 𝑄}
71	70	uneq2i 4163	. . . . . . . . . . 11 ⊢ ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄}) = ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑥 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑥 + (𝑘 · 𝑇)) ∈ ran 𝑄})
72		fourierdlem112.n	. . . . . . . . . . 11 ⊢ 𝑁 = ((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)
73		fourierdlem112.v	. . . . . . . . . . 11 ⊢ 𝑉 = (℩𝑓𝑓 Isom < , < ((0...𝑁), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})))
74	50, 51, 52, 53, 57, 58, 66, 45, 71, 72, 73	fourierdlem54 47306	. . . . . . . . . 10 ⊢ (𝜑 → ((𝑁 ∈ ℕ ∧ 𝑉 ∈ ((𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = ( -π + 𝑋) ∧ (𝑝‘𝑛) = (π + 𝑋)) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))})‘𝑁)) ∧ 𝑉 Isom < , < ((0...𝑁), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄}))))
75	74	simpld 500	. . . . . . . . 9 ⊢ (𝜑 → (𝑁 ∈ ℕ ∧ 𝑉 ∈ ((𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = ( -π + 𝑋) ∧ (𝑝‘𝑛) = (π + 𝑋)) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))})‘𝑁)))
76	75	simpld 500	. . . . . . . 8 ⊢ (𝜑 → 𝑁 ∈ ℕ)
77	75	simprd 501	. . . . . . . 8 ⊢ (𝜑 → 𝑉 ∈ ((𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = ( -π + 𝑋) ∧ (𝑝‘𝑛) = (π + 𝑋)) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))})‘𝑁))
78		fourierdlem112.xran	. . . . . . . 8 ⊢ (𝜑 → 𝑋 ∈ ran 𝑉)
79	43	adantr 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → 𝐹:ℝ⟶ℝ)
80		fveq2 6890	. . . . . . . . . . . . . . . 16 ⊢ (𝑖 = 𝑗 → (𝑝‘𝑖) = (𝑝‘𝑗))
81		oveq1 7431	. . . . . . . . . . . . . . . . 17 ⊢ (𝑖 = 𝑗 → (𝑖 + 1) = (𝑗 + 1))
82	81	fveq2d 6894	. . . . . . . . . . . . . . . 16 ⊢ (𝑖 = 𝑗 → (𝑝‘(𝑖 + 1)) = (𝑝‘(𝑗 + 1)))
83	80, 82	breq12d 5115	. . . . . . . . . . . . . . 15 ⊢ (𝑖 = 𝑗 → ((𝑝‘𝑖) < (𝑝‘(𝑖 + 1)) ↔ (𝑝‘𝑗) < (𝑝‘(𝑗 + 1))))
84	83	cbvralvw 3240	. . . . . . . . . . . . . 14 ⊢ (∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)) ↔ ∀𝑗 ∈ (0..^𝑛)(𝑝‘𝑗) < (𝑝‘(𝑗 + 1)))
85	84	anbi2i 635	. . . . . . . . . . . . 13 ⊢ ((((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1))) ↔ (((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑗 ∈ (0..^𝑛)(𝑝‘𝑗) < (𝑝‘(𝑗 + 1))))
86	85	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑝 ∈ (ℝ ↑_m (0...𝑛)) → ((((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1))) ↔ (((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑗 ∈ (0..^𝑛)(𝑝‘𝑗) < (𝑝‘(𝑗 + 1)))))
87	86	rabbiia 3416	. . . . . . . . . . 11 ⊢ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))} = {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑗 ∈ (0..^𝑛)(𝑝‘𝑗) < (𝑝‘(𝑗 + 1)))}
88	87	mpteq2i 5200	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))}) = (𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑗 ∈ (0..^𝑛)(𝑝‘𝑗) < (𝑝‘(𝑗 + 1)))})
89	51, 88	eqtri 2783	. . . . . . . . 9 ⊢ 𝑃 = (𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = -π ∧ (𝑝‘𝑛) = π) ∧ ∀𝑗 ∈ (0..^𝑛)(𝑝‘𝑗) < (𝑝‘(𝑗 + 1)))})
90	52	adantr 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → 𝑀 ∈ ℕ)
91	53	adantr 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → 𝑄 ∈ (𝑃‘𝑀))
92		fourierdlem112.fper	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → (𝐹‘(𝑥 + 𝑇)) = (𝐹‘𝑥))
93	92	adantlr 728	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ 𝑥 ∈ ℝ) → (𝐹‘(𝑥 + 𝑇)) = (𝐹‘𝑥))
94		eleq1w 2843	. . . . . . . . . . . . 13 ⊢ (𝑖 = 𝑗 → (𝑖 ∈ (0..^𝑀) ↔ 𝑗 ∈ (0..^𝑀)))
95	94	anbi2d 642	. . . . . . . . . . . 12 ⊢ (𝑖 = 𝑗 → ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) ↔ (𝜑 ∧ 𝑗 ∈ (0..^𝑀))))
96		fveq2 6890	. . . . . . . . . . . . . . 15 ⊢ (𝑖 = 𝑗 → (𝑄‘𝑖) = (𝑄‘𝑗))
97	81	fveq2d 6894	. . . . . . . . . . . . . . 15 ⊢ (𝑖 = 𝑗 → (𝑄‘(𝑖 + 1)) = (𝑄‘(𝑗 + 1)))
98	96, 97	oveq12d 7442	. . . . . . . . . . . . . 14 ⊢ (𝑖 = 𝑗 → ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1))) = ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1))))
99	98	reseq2d 5971	. . . . . . . . . . . . 13 ⊢ (𝑖 = 𝑗 → (𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) = (𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))))
100	98	oveq1d 7439	. . . . . . . . . . . . 13 ⊢ (𝑖 = 𝑗 → (((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))–cn→ℂ) = (((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))–cn→ℂ))
101	99, 100	eleq12d 2854	. . . . . . . . . . . 12 ⊢ (𝑖 = 𝑗 → ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) ∈ (((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))–cn→ℂ) ↔ (𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) ∈ (((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))–cn→ℂ)))
102	95, 101	imbi12d 347	. . . . . . . . . . 11 ⊢ (𝑖 = 𝑗 → (((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → (𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) ∈ (((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))–cn→ℂ)) ↔ ((𝜑 ∧ 𝑗 ∈ (0..^𝑀)) → (𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) ∈ (((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))–cn→ℂ))))
103		fourierdlem112.fcn	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → (𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) ∈ (((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))–cn→ℂ))
104	102, 103	chvarvv 2021	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑗 ∈ (0..^𝑀)) → (𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) ∈ (((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))–cn→ℂ))
105	104	adantlr 728	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ 𝑗 ∈ (0..^𝑀)) → (𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) ∈ (((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))–cn→ℂ))
106	57	adantr 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ( -π + 𝑋) ∈ ℝ)
107	57	rexrd 11366	. . . . . . . . . . 11 ⊢ (𝜑 → ( -π + 𝑋) ∈ ℝ^*)
108		pnfxr 11370	. . . . . . . . . . . 12 ⊢ +∞ ∈ ℝ^*
109	108	a1i 11	. . . . . . . . . . 11 ⊢ (𝜑 → +∞ ∈ ℝ^*)
110	58	ltpnfd 13257	. . . . . . . . . . 11 ⊢ (𝜑 → (π + 𝑋) < +∞)
111	107, 109, 58, 66, 110	eliood 46646	. . . . . . . . . 10 ⊢ (𝜑 → (π + 𝑋) ∈ (( -π + 𝑋)(,)+∞))
112	111	adantr 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → (π + 𝑋) ∈ (( -π + 𝑋)(,)+∞))
113		id 23	. . . . . . . . . . 11 ⊢ (𝑖 ∈ (0..^𝑁) → 𝑖 ∈ (0..^𝑁))
114	72	oveq2i 7435	. . . . . . . . . . 11 ⊢ (0..^𝑁) = (0..^((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1))
115	113, 114	eleqtrdi 2870	. . . . . . . . . 10 ⊢ (𝑖 ∈ (0..^𝑁) → 𝑖 ∈ (0..^((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)))
116	115	adantl 487	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → 𝑖 ∈ (0..^((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)))
117	72	oveq2i 7435	. . . . . . . . . . . 12 ⊢ (0...𝑁) = (0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1))
118		isoeq4 7332	. . . . . . . . . . . 12 ⊢ ((0...𝑁) = (0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)) → (𝑓 Isom < , < ((0...𝑁), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) ↔ 𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄}))))
119	117, 118	ax-mp 5	. . . . . . . . . . 11 ⊢ (𝑓 Isom < , < ((0...𝑁), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) ↔ 𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})))
120	119	iotabii 6527	. . . . . . . . . 10 ⊢ (℩𝑓𝑓 Isom < , < ((0...𝑁), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄}))) = (℩𝑓𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})))
121	73, 120	eqtri 2783	. . . . . . . . 9 ⊢ 𝑉 = (℩𝑓𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})))
122	79, 89, 50, 90, 91, 93, 105, 106, 112, 116, 121	fourierdlem98 47350	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → (𝐹 ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) ∈ (((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))–cn→ℂ))
123		fourierdlem112.fbd	. . . . . . . . . 10 ⊢ (𝜑 → ∃𝑤 ∈ ℝ ∀𝑡 ∈ ℝ (abs‘(𝐹‘𝑡)) ≤ 𝑤)
124	123	adantr 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ∃𝑤 ∈ ℝ ∀𝑡 ∈ ℝ (abs‘(𝐹‘𝑡)) ≤ 𝑤)
125		nfra1 3286	. . . . . . . . . . 11 ⊢ Ⅎ𝑡∀𝑡 ∈ ℝ (abs‘(𝐹‘𝑡)) ≤ 𝑤
126		elioore 13513	. . . . . . . . . . . . 13 ⊢ (𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))) → 𝑡 ∈ ℝ)
127		rspa 3251	. . . . . . . . . . . . 13 ⊢ ((∀𝑡 ∈ ℝ (abs‘(𝐹‘𝑡)) ≤ 𝑤 ∧ 𝑡 ∈ ℝ) → (abs‘(𝐹‘𝑡)) ≤ 𝑤)
128	126, 127	sylan2 605	. . . . . . . . . . . 12 ⊢ ((∀𝑡 ∈ ℝ (abs‘(𝐹‘𝑡)) ≤ 𝑤 ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → (abs‘(𝐹‘𝑡)) ≤ 𝑤)
129	128	ex 418	. . . . . . . . . . 11 ⊢ (∀𝑡 ∈ ℝ (abs‘(𝐹‘𝑡)) ≤ 𝑤 → (𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))) → (abs‘(𝐹‘𝑡)) ≤ 𝑤))
130	125, 129	ralrimi 3260	. . . . . . . . . 10 ⊢ (∀𝑡 ∈ ℝ (abs‘(𝐹‘𝑡)) ≤ 𝑤 → ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(𝐹‘𝑡)) ≤ 𝑤)
131	130	reximi 3100	. . . . . . . . 9 ⊢ (∃𝑤 ∈ ℝ ∀𝑡 ∈ ℝ (abs‘(𝐹‘𝑡)) ≤ 𝑤 → ∃𝑤 ∈ ℝ ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(𝐹‘𝑡)) ≤ 𝑤)
132	124, 131	syl 18	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ∃𝑤 ∈ ℝ ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(𝐹‘𝑡)) ≤ 𝑤)
133		ssid 3931	. . . . . . . . . . . 12 ⊢ ℝ ⊆ ℝ
134		dvfre 26280	. . . . . . . . . . . 12 ⊢ ((𝐹:ℝ⟶ℝ ∧ ℝ ⊆ ℝ) → (ℝ D 𝐹):dom (ℝ D 𝐹)⟶ℝ)
135	43, 133, 134	sylancl 598	. . . . . . . . . . 11 ⊢ (𝜑 → (ℝ D 𝐹):dom (ℝ D 𝐹)⟶ℝ)
136	135	adantr 486	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → (ℝ D 𝐹):dom (ℝ D 𝐹)⟶ℝ)
137		eqid 2760	. . . . . . . . . . . . 13 ⊢ (ℝ D 𝐹) = (ℝ D 𝐹)
138	54	a1i 11	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → π ∈ ℝ)
139	61	a1i 11	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → -π ∈ ℝ)
140	98	reseq2d 5971	. . . . . . . . . . . . . . . . 17 ⊢ (𝑖 = 𝑗 → ((ℝ D 𝐹) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) = ((ℝ D 𝐹) ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))))
141	140, 100	eleq12d 2854	. . . . . . . . . . . . . . . 16 ⊢ (𝑖 = 𝑗 → (((ℝ D 𝐹) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) ∈ (((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))–cn→ℂ) ↔ ((ℝ D 𝐹) ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) ∈ (((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))–cn→ℂ)))
142	95, 141	imbi12d 347	. . . . . . . . . . . . . . 15 ⊢ (𝑖 = 𝑗 → (((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → ((ℝ D 𝐹) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) ∈ (((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))–cn→ℂ)) ↔ ((𝜑 ∧ 𝑗 ∈ (0..^𝑀)) → ((ℝ D 𝐹) ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) ∈ (((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))–cn→ℂ))))
143		fourierdlem112.fdvcn	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → ((ℝ D 𝐹) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) ∈ (((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))–cn→ℂ))
144	142, 143	chvarvv 2021	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑗 ∈ (0..^𝑀)) → ((ℝ D 𝐹) ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) ∈ (((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))–cn→ℂ))
145	144	adantlr 728	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ 𝑗 ∈ (0..^𝑀)) → ((ℝ D 𝐹) ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) ∈ (((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))–cn→ℂ))
146		fourierdlem112.x	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑋 ∈ ℝ)
147	56, 146	readdcld 11345	. . . . . . . . . . . . . 14 ⊢ (𝜑 → ( -π + 𝑋) ∈ ℝ)
148	147	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ( -π + 𝑋) ∈ ℝ)
149	147	rexrd 11366	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ( -π + 𝑋) ∈ ℝ^*)
150	55, 146	readdcld 11345	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (π + 𝑋) ∈ ℝ)
151	56, 55, 146, 65	ltadd1dd 11934	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → ( -π + 𝑋) < (π + 𝑋))
152	150	ltpnfd 13257	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (π + 𝑋) < +∞)
153	149, 109, 150, 151, 152	eliood 46646	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (π + 𝑋) ∈ (( -π + 𝑋)(,)+∞))
154	153	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → (π + 𝑋) ∈ (( -π + 𝑋)(,)+∞))
155		oveq1 7431	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑘 = ℎ → (𝑘 · 𝑇) = (ℎ · 𝑇))
156	155	oveq2d 7440	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑘 = ℎ → (𝑦 + (𝑘 · 𝑇)) = (𝑦 + (ℎ · 𝑇)))
157	156	eleq1d 2845	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑘 = ℎ → ((𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄 ↔ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄))
158	157	cbvrexvw 3241	. . . . . . . . . . . . . . . . . . 19 ⊢ (∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄 ↔ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄)
159	158	rgenw 3080	. . . . . . . . . . . . . . . . . 18 ⊢ ∀𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋))(∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄 ↔ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄)
160		rabbi 3441	. . . . . . . . . . . . . . . . . 18 ⊢ (∀𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋))(∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄 ↔ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄) ↔ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄} = {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄})
161	159, 160	mpbi 233	. . . . . . . . . . . . . . . . 17 ⊢ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄} = {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄}
162	161	uneq2i 4163	. . . . . . . . . . . . . . . 16 ⊢ ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄}) = ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄})
163		isoeq5 7333	. . . . . . . . . . . . . . . 16 ⊢ (({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄}) = ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄}) → (𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) ↔ 𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄}))))
164	162, 163	ax-mp 5	. . . . . . . . . . . . . . 15 ⊢ (𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) ↔ 𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄})))
165	164	iotabii 6527	. . . . . . . . . . . . . 14 ⊢ (℩𝑓𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄}))) = (℩𝑓𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄})))
166	121, 165	eqtri 2783	. . . . . . . . . . . . 13 ⊢ 𝑉 = (℩𝑓𝑓 Isom < , < ((0...((♯‘({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃𝑘 ∈ ℤ (𝑦 + (𝑘 · 𝑇)) ∈ ran 𝑄})) − 1)), ({( -π + 𝑋), (π + 𝑋)} ∪ {𝑦 ∈ (( -π + 𝑋)[,](π + 𝑋)) ∣ ∃ℎ ∈ ℤ (𝑦 + (ℎ · 𝑇)) ∈ ran 𝑄})))
167		eleq1w 2843	. . . . . . . . . . . . . . 15 ⊢ (𝑣 = 𝑢 → (𝑣 ∈ dom (ℝ D 𝐹) ↔ 𝑢 ∈ dom (ℝ D 𝐹)))
168		fveq2 6890	. . . . . . . . . . . . . . 15 ⊢ (𝑣 = 𝑢 → ((ℝ D 𝐹)‘𝑣) = ((ℝ D 𝐹)‘𝑢))
169	167, 168	ifbieq1d 4506	. . . . . . . . . . . . . 14 ⊢ (𝑣 = 𝑢 → if(𝑣 ∈ dom (ℝ D 𝐹), ((ℝ D 𝐹)‘𝑣), 0) = if(𝑢 ∈ dom (ℝ D 𝐹), ((ℝ D 𝐹)‘𝑢), 0))
170	169	cbvmptv 5208	. . . . . . . . . . . . 13 ⊢ (𝑣 ∈ ℝ ↦ if(𝑣 ∈ dom (ℝ D 𝐹), ((ℝ D 𝐹)‘𝑣), 0)) = (𝑢 ∈ ℝ ↦ if(𝑢 ∈ dom (ℝ D 𝐹), ((ℝ D 𝐹)‘𝑢), 0))
171	79, 137, 89, 138, 139, 50, 90, 91, 93, 145, 148, 154, 116, 166, 170	fourierdlem97 47349	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) ∈ (((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))–cn→ℂ))
172		cncff 25223	. . . . . . . . . . . 12 ⊢ (((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) ∈ (((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))–cn→ℂ) → ((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))):((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))⟶ℂ)
173		fdm 6724	. . . . . . . . . . . 12 ⊢ (((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))):((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))⟶ℂ → dom ((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) = ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))
174	171, 172, 173	3syl 19	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → dom ((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) = ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))
175		ssdmres 6006	. . . . . . . . . . 11 ⊢ (((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))) ⊆ dom (ℝ D 𝐹) ↔ dom ((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) = ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))
176	174, 175	sylibr 237	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))) ⊆ dom (ℝ D 𝐹))
177	136, 176	fssresd 6754	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))):((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))⟶ℝ)
178		ax-resscn 11264	. . . . . . . . . . 11 ⊢ ℝ ⊆ ℂ
179	178	a1i 11	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ℝ ⊆ ℂ)
180		cncfcdm 25228	. . . . . . . . . 10 ⊢ ((ℝ ⊆ ℂ ∧ ((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) ∈ (((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))–cn→ℂ)) → (((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) ∈ (((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))–cn→ℝ) ↔ ((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))):((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))⟶ℝ))
181	179, 171, 180	syl2anc 596	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → (((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) ∈ (((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))–cn→ℝ) ↔ ((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))):((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))⟶ℝ))
182	177, 181	mpbird 260	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) ∈ (((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))–cn→ℝ))
183		fourierdlem112.fdvbd	. . . . . . . . . . 11 ⊢ (𝜑 → ∃𝑧 ∈ ℝ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧)
184	183	adantr 486	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ∃𝑧 ∈ ℝ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧)
185		nfv 1946	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑡(𝜑 ∧ 𝑖 ∈ (0..^𝑁))
186		nfra1 3286	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑡∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧
187	185, 186	nfan 1931	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑡((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧)
188		fvres 6909	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))) → (((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡) = ((ℝ D 𝐹)‘𝑡))
189	188	adantl 487	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → (((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡) = ((ℝ D 𝐹)‘𝑡))
190	189	fveq2d 6894	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → (abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) = (abs‘((ℝ D 𝐹)‘𝑡)))
191	190	adantlr 728	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧) ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → (abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) = (abs‘((ℝ D 𝐹)‘𝑡)))
192		simplr 781	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧) ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧)
193	176	sselda 3909	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → 𝑡 ∈ dom (ℝ D 𝐹))
194	193	adantlr 728	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧) ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → 𝑡 ∈ dom (ℝ D 𝐹))
195		rspa 3251	. . . . . . . . . . . . . . . 16 ⊢ ((∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧 ∧ 𝑡 ∈ dom (ℝ D 𝐹)) → (abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧)
196	192, 194, 195	syl2anc 596	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧) ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → (abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧)
197	191, 196	eqbrtrd 5126	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧) ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → (abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧)
198	197	ex 418	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧) → (𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))) → (abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧))
199	187, 198	ralrimi 3260	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧) → ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧)
200	199	ex 418	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → (∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧 → ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧))
201	200	reximdv 3177	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → (∃𝑧 ∈ ℝ ∀𝑡 ∈ dom (ℝ D 𝐹)(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧 → ∃𝑧 ∈ ℝ ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧))
202	184, 201	mpd 16	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ∃𝑧 ∈ ℝ ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧)
203		nfra1 3286	. . . . . . . . . . . 12 ⊢ Ⅎ𝑡∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧
204	188	eqcomd 2766	. . . . . . . . . . . . . . . 16 ⊢ (𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))) → ((ℝ D 𝐹)‘𝑡) = (((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡))
205	204	fveq2d 6894	. . . . . . . . . . . . . . 15 ⊢ (𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))) → (abs‘((ℝ D 𝐹)‘𝑡)) = (abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)))
206	205	adantl 487	. . . . . . . . . . . . . 14 ⊢ ((∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧 ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → (abs‘((ℝ D 𝐹)‘𝑡)) = (abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)))
207		rspa 3251	. . . . . . . . . . . . . 14 ⊢ ((∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧 ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → (abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧)
208	206, 207	eqbrtrd 5126	. . . . . . . . . . . . 13 ⊢ ((∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧 ∧ 𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) → (abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧)
209	208	ex 418	. . . . . . . . . . . 12 ⊢ (∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧 → (𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))) → (abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧))
210	203, 209	ralrimi 3260	. . . . . . . . . . 11 ⊢ (∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧 → ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧)
211	210	a1i 11	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → (∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧 → ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧))
212	211	reximdv 3177	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → (∃𝑧 ∈ ℝ ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘(((ℝ D 𝐹) ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1))))‘𝑡)) ≤ 𝑧 → ∃𝑧 ∈ ℝ ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧))
213	202, 212	mpd 16	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → ∃𝑧 ∈ ℝ ∀𝑡 ∈ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))(abs‘((ℝ D 𝐹)‘𝑡)) ≤ 𝑧)
214		nfv 1946	. . . . . . . . . . . 12 ⊢ Ⅎ𝑖(𝜑 ∧ 𝑗 ∈ (0..^𝑀))
215		nfcsb1v 3871	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑖⦋𝑗 / 𝑖⦌𝐶
216	215	nfel1 2938	. . . . . . . . . . . 12 ⊢ Ⅎ𝑖⦋𝑗 / 𝑖⦌𝐶 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘𝑗))
217	214, 216	nfim 1928	. . . . . . . . . . 11 ⊢ Ⅎ𝑖((𝜑 ∧ 𝑗 ∈ (0..^𝑀)) → ⦋𝑗 / 𝑖⦌𝐶 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘𝑗)))
218		csbeq1a 3861	. . . . . . . . . . . . 13 ⊢ (𝑖 = 𝑗 → 𝐶 = ⦋𝑗 / 𝑖⦌𝐶)
219	99, 96	oveq12d 7442	. . . . . . . . . . . . 13 ⊢ (𝑖 = 𝑗 → ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘𝑖)) = ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘𝑗)))
220	218, 219	eleq12d 2854	. . . . . . . . . . . 12 ⊢ (𝑖 = 𝑗 → (𝐶 ∈ ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘𝑖)) ↔ ⦋𝑗 / 𝑖⦌𝐶 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘𝑗))))
221	95, 220	imbi12d 347	. . . . . . . . . . 11 ⊢ (𝑖 = 𝑗 → (((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → 𝐶 ∈ ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘𝑖))) ↔ ((𝜑 ∧ 𝑗 ∈ (0..^𝑀)) → ⦋𝑗 / 𝑖⦌𝐶 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘𝑗)))))
222		fourierdlem112.c	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → 𝐶 ∈ ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘𝑖)))
223	217, 221, 222	chvarfv 2276	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑗 ∈ (0..^𝑀)) → ⦋𝑗 / 𝑖⦌𝐶 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘𝑗)))
224	223	adantlr 728	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ 𝑗 ∈ (0..^𝑀)) → ⦋𝑗 / 𝑖⦌𝐶 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘𝑗)))
225	79, 89, 50, 90, 91, 93, 105, 224, 106, 112, 116, 121	fourierdlem96 47348	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → if(((𝑑 ∈ ( -π(,]π) ↦ if(𝑑 = π, -π, 𝑑))‘((𝑐 ∈ ℝ ↦ (𝑐 + ((⌊‘((π − 𝑐) / 𝑇)) · 𝑇)))‘(𝑉‘𝑖))) = (𝑄‘((𝑦 ∈ ℝ ↦ sup({𝑓 ∈ (0..^𝑀) ∣ (𝑄‘𝑓) ≤ ((𝑑 ∈ ( -π(,]π) ↦ if(𝑑 = π, -π, 𝑑))‘((𝑐 ∈ ℝ ↦ (𝑐 + ((⌊‘((π − 𝑐) / 𝑇)) · 𝑇)))‘𝑦))}, ℝ, < ))‘(𝑉‘𝑖))), ((𝑗 ∈ (0..^𝑀) ↦ ⦋𝑗 / 𝑖⦌𝐶)‘((𝑦 ∈ ℝ ↦ sup({𝑓 ∈ (0..^𝑀) ∣ (𝑄‘𝑓) ≤ ((𝑑 ∈ ( -π(,]π) ↦ if(𝑑 = π, -π, 𝑑))‘((𝑐 ∈ ℝ ↦ (𝑐 + ((⌊‘((π − 𝑐) / 𝑇)) · 𝑇)))‘𝑦))}, ℝ, < ))‘(𝑉‘𝑖))), (𝐹‘((𝑑 ∈ ( -π(,]π) ↦ if(𝑑 = π, -π, 𝑑))‘((𝑐 ∈ ℝ ↦ (𝑐 + ((⌊‘((π − 𝑐) / 𝑇)) · 𝑇)))‘(𝑉‘𝑖))))) ∈ ((𝐹 ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) lim_ℂ (𝑉‘𝑖)))
226		nfcsb1v 3871	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑖⦋𝑗 / 𝑖⦌𝑈
227	226	nfel1 2938	. . . . . . . . . . . 12 ⊢ Ⅎ𝑖⦋𝑗 / 𝑖⦌𝑈 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘(𝑗 + 1)))
228	214, 227	nfim 1928	. . . . . . . . . . 11 ⊢ Ⅎ𝑖((𝜑 ∧ 𝑗 ∈ (0..^𝑀)) → ⦋𝑗 / 𝑖⦌𝑈 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘(𝑗 + 1))))
229		csbeq1a 3861	. . . . . . . . . . . . 13 ⊢ (𝑖 = 𝑗 → 𝑈 = ⦋𝑗 / 𝑖⦌𝑈)
230	99, 97	oveq12d 7442	. . . . . . . . . . . . 13 ⊢ (𝑖 = 𝑗 → ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘(𝑖 + 1))) = ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘(𝑗 + 1))))
231	229, 230	eleq12d 2854	. . . . . . . . . . . 12 ⊢ (𝑖 = 𝑗 → (𝑈 ∈ ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘(𝑖 + 1))) ↔ ⦋𝑗 / 𝑖⦌𝑈 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘(𝑗 + 1)))))
232	95, 231	imbi12d 347	. . . . . . . . . . 11 ⊢ (𝑖 = 𝑗 → (((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → 𝑈 ∈ ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘(𝑖 + 1)))) ↔ ((𝜑 ∧ 𝑗 ∈ (0..^𝑀)) → ⦋𝑗 / 𝑖⦌𝑈 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘(𝑗 + 1))))))
233		fourierdlem112.u	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → 𝑈 ∈ ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘(𝑖 + 1))))
234	228, 232, 233	chvarfv 2276	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑗 ∈ (0..^𝑀)) → ⦋𝑗 / 𝑖⦌𝑈 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘(𝑗 + 1))))
235	234	adantlr 728	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) ∧ 𝑗 ∈ (0..^𝑀)) → ⦋𝑗 / 𝑖⦌𝑈 ∈ ((𝐹 ↾ ((𝑄‘𝑗)(,)(𝑄‘(𝑗 + 1)))) lim_ℂ (𝑄‘(𝑗 + 1))))
236	79, 89, 50, 90, 91, 93, 105, 235, 148, 154, 116, 121	fourierdlem99 47351	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑁)) → if(((𝑒 ∈ ℝ ↦ (𝑒 + ((⌊‘((π − 𝑒) / 𝑇)) · 𝑇)))‘(𝑉‘(𝑖 + 1))) = (𝑄‘(((𝑦 ∈ ℝ ↦ sup({ℎ ∈ (0..^𝑀) ∣ (𝑄‘ℎ) ≤ ((𝑔 ∈ ( -π(,]π) ↦ if(𝑔 = π, -π, 𝑔))‘((𝑒 ∈ ℝ ↦ (𝑒 + ((⌊‘((π − 𝑒) / 𝑇)) · 𝑇)))‘𝑦))}, ℝ, < ))‘(𝑉‘𝑖)) + 1)), ((𝑗 ∈ (0..^𝑀) ↦ ⦋𝑗 / 𝑖⦌𝑈)‘((𝑦 ∈ ℝ ↦ sup({ℎ ∈ (0..^𝑀) ∣ (𝑄‘ℎ) ≤ ((𝑔 ∈ ( -π(,]π) ↦ if(𝑔 = π, -π, 𝑔))‘((𝑒 ∈ ℝ ↦ (𝑒 + ((⌊‘((π − 𝑒) / 𝑇)) · 𝑇)))‘𝑦))}, ℝ, < ))‘(𝑉‘𝑖))), (𝐹‘((𝑒 ∈ ℝ ↦ (𝑒 + ((⌊‘((π − 𝑒) / 𝑇)) · 𝑇)))‘(𝑉‘(𝑖 + 1))))) ∈ ((𝐹 ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) lim_ℂ (𝑉‘(𝑖 + 1))))
237		eqeq1 2764	. . . . . . . . . 10 ⊢ (𝑔 = 𝑠 → (𝑔 = 0 ↔ 𝑠 = 0))
238		oveq2 7432	. . . . . . . . . . . . 13 ⊢ (𝑔 = 𝑠 → (𝑋 + 𝑔) = (𝑋 + 𝑠))
239	238	fveq2d 6894	. . . . . . . . . . . 12 ⊢ (𝑔 = 𝑠 → (𝐹‘(𝑋 + 𝑔)) = (𝐹‘(𝑋 + 𝑠)))
240		breq2 5106	. . . . . . . . . . . . 13 ⊢ (𝑔 = 𝑠 → (0 < 𝑔 ↔ 0 < 𝑠))
241	240	ifbid 4505	. . . . . . . . . . . 12 ⊢ (𝑔 = 𝑠 → if(0 < 𝑔, 𝑅, 𝐿) = if(0 < 𝑠, 𝑅, 𝐿))
242	239, 241	oveq12d 7442	. . . . . . . . . . 11 ⊢ (𝑔 = 𝑠 → ((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) = ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑅, 𝐿)))
243		id 23	. . . . . . . . . . 11 ⊢ (𝑔 = 𝑠 → 𝑔 = 𝑠)
244	242, 243	oveq12d 7442	. . . . . . . . . 10 ⊢ (𝑔 = 𝑠 → (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔) = (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑅, 𝐿)) / 𝑠))
245	237, 244	ifbieq2d 4508	. . . . . . . . 9 ⊢ (𝑔 = 𝑠 → if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)) = if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑅, 𝐿)) / 𝑠)))
246	245	cbvmptv 5208	. . . . . . . 8 ⊢ (𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔))) = (𝑠 ∈ ( -π[,]π) ↦ if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑅, 𝐿)) / 𝑠)))
247		eqeq1 2764	. . . . . . . . . 10 ⊢ (𝑜 = 𝑠 → (𝑜 = 0 ↔ 𝑠 = 0))
248		id 23	. . . . . . . . . . 11 ⊢ (𝑜 = 𝑠 → 𝑜 = 𝑠)
249		oveq1 7431	. . . . . . . . . . . . 13 ⊢ (𝑜 = 𝑠 → (𝑜 / 2) = (𝑠 / 2))
250	249	fveq2d 6894	. . . . . . . . . . . 12 ⊢ (𝑜 = 𝑠 → (sin‘(𝑜 / 2)) = (sin‘(𝑠 / 2)))
251	250	oveq2d 7440	. . . . . . . . . . 11 ⊢ (𝑜 = 𝑠 → (2 · (sin‘(𝑜 / 2))) = (2 · (sin‘(𝑠 / 2))))
252	248, 251	oveq12d 7442	. . . . . . . . . 10 ⊢ (𝑜 = 𝑠 → (𝑜 / (2 · (sin‘(𝑜 / 2)))) = (𝑠 / (2 · (sin‘(𝑠 / 2)))))
253	247, 252	ifbieq2d 4508	. . . . . . . . 9 ⊢ (𝑜 = 𝑠 → if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))) = if(𝑠 = 0, 1, (𝑠 / (2 · (sin‘(𝑠 / 2))))))
254	253	cbvmptv 5208	. . . . . . . 8 ⊢ (𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2)))))) = (𝑠 ∈ ( -π[,]π) ↦ if(𝑠 = 0, 1, (𝑠 / (2 · (sin‘(𝑠 / 2))))))
255		fveq2 6890	. . . . . . . . . 10 ⊢ (𝑟 = 𝑠 → ((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) = ((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑠))
256		fveq2 6890	. . . . . . . . . 10 ⊢ (𝑟 = 𝑠 → ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟) = ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑠))
257	255, 256	oveq12d 7442	. . . . . . . . 9 ⊢ (𝑟 = 𝑠 → (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)) = (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑠) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑠)))
258	257	cbvmptv 5208	. . . . . . . 8 ⊢ (𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟))) = (𝑠 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑠) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑠)))
259		oveq2 7432	. . . . . . . . . 10 ⊢ (𝑑 = 𝑠 → ((𝑘 + (1 / 2)) · 𝑑) = ((𝑘 + (1 / 2)) · 𝑠))
260	259	fveq2d 6894	. . . . . . . . 9 ⊢ (𝑑 = 𝑠 → (sin‘((𝑘 + (1 / 2)) · 𝑑)) = (sin‘((𝑘 + (1 / 2)) · 𝑠)))
261	260	cbvmptv 5208	. . . . . . . 8 ⊢ (𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑))) = (𝑠 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑠)))
262		fveq2 6890	. . . . . . . . . 10 ⊢ (𝑧 = 𝑠 → ((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) = ((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠))
263		fveq2 6890	. . . . . . . . . 10 ⊢ (𝑧 = 𝑠 → ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧) = ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑠))
264	262, 263	oveq12d 7442	. . . . . . . . 9 ⊢ (𝑧 = 𝑠 → (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)) = (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑠)))
265	264	cbvmptv 5208	. . . . . . . 8 ⊢ (𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧))) = (𝑠 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑠)))
266		fveq2 6890	. . . . . . . . . . . . 13 ⊢ (𝑚 = 𝑛 → (𝐷‘𝑚) = (𝐷‘𝑛))
267	266	fveq1d 6892	. . . . . . . . . . . 12 ⊢ (𝑚 = 𝑛 → ((𝐷‘𝑚)‘𝑠) = ((𝐷‘𝑛)‘𝑠))
268	267	oveq2d 7440	. . . . . . . . . . 11 ⊢ (𝑚 = 𝑛 → ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) = ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)))
269	268	adantr 486	. . . . . . . . . 10 ⊢ ((𝑚 = 𝑛 ∧ 𝑠 ∈ ( -π(,)0)) → ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) = ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)))
270	269	itgeq2dv 26111	. . . . . . . . 9 ⊢ (𝑚 = 𝑛 → ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠 = ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠)
271	270	cbvmptv 5208	. . . . . . . 8 ⊢ (𝑚 ∈ ℕ ↦ ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠) = (𝑛 ∈ ℕ ↦ ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠)
272		oveq1 7431	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑐 = 𝑘 → (𝑐 + (1 / 2)) = (𝑘 + (1 / 2)))
273	272	oveq1d 7439	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑐 = 𝑘 → ((𝑐 + (1 / 2)) · 𝑑) = ((𝑘 + (1 / 2)) · 𝑑))
274	273	fveq2d 6894	. . . . . . . . . . . . . . . . 17 ⊢ (𝑐 = 𝑘 → (sin‘((𝑐 + (1 / 2)) · 𝑑)) = (sin‘((𝑘 + (1 / 2)) · 𝑑)))
275	274	mpteq2dv 5198	. . . . . . . . . . . . . . . 16 ⊢ (𝑐 = 𝑘 → (𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑))) = (𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑))))
276	275	fveq1d 6892	. . . . . . . . . . . . . . 15 ⊢ (𝑐 = 𝑘 → ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧) = ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧))
277	276	oveq2d 7440	. . . . . . . . . . . . . 14 ⊢ (𝑐 = 𝑘 → (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧)) = (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)))
278	277	mpteq2dv 5198	. . . . . . . . . . . . 13 ⊢ (𝑐 = 𝑘 → (𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧))) = (𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧))))
279	278	fveq1d 6892	. . . . . . . . . . . 12 ⊢ (𝑐 = 𝑘 → ((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) = ((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠))
280	279	adantr 486	. . . . . . . . . . 11 ⊢ ((𝑐 = 𝑘 ∧ 𝑠 ∈ ( -π(,)0)) → ((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) = ((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠))
281	280	itgeq2dv 26111	. . . . . . . . . 10 ⊢ (𝑐 = 𝑘 → ∫( -π(,)0)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠 = ∫( -π(,)0)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠)
282	281	oveq1d 7439	. . . . . . . . 9 ⊢ (𝑐 = 𝑘 → (∫( -π(,)0)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠 / π) = (∫( -π(,)0)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠 / π))
283	282	cbvmptv 5208	. . . . . . . 8 ⊢ (𝑐 ∈ ℕ ↦ (∫( -π(,)0)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠 / π)) = (𝑘 ∈ ℕ ↦ (∫( -π(,)0)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠 / π))
284		fourierdlem112.r	. . . . . . . 8 ⊢ (𝜑 → 𝑅 ∈ ((𝐹 ↾ (𝑋(,)+∞)) lim_ℂ 𝑋))
285		fourierdlem112.l	. . . . . . . 8 ⊢ (𝜑 → 𝐿 ∈ ((𝐹 ↾ (-∞(,)𝑋)) lim_ℂ 𝑋))
286		fourierdlem112.e	. . . . . . . 8 ⊢ (𝜑 → 𝐸 ∈ (((ℝ D 𝐹) ↾ (-∞(,)𝑋)) lim_ℂ 𝑋))
287		fourierdlem112.i	. . . . . . . 8 ⊢ (𝜑 → 𝐼 ∈ (((ℝ D 𝐹) ↾ (𝑋(,)+∞)) lim_ℂ 𝑋))
288		fourierdlem112.d	. . . . . . . . 9 ⊢ 𝐷 = (𝑚 ∈ ℕ ↦ (𝑦 ∈ ℝ ↦ if((𝑦 mod (2 · π)) = 0, (((2 · 𝑚) + 1) / (2 · π)), ((sin‘((𝑚 + (1 / 2)) · 𝑦)) / ((2 · π) · (sin‘(𝑦 / 2)))))))
289		oveq1 7431	. . . . . . . . . . . . . 14 ⊢ (𝑦 = 𝑠 → (𝑦 mod (2 · π)) = (𝑠 mod (2 · π)))
290	289	eqeq1d 2762	. . . . . . . . . . . . 13 ⊢ (𝑦 = 𝑠 → ((𝑦 mod (2 · π)) = 0 ↔ (𝑠 mod (2 · π)) = 0))
291		oveq2 7432	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = 𝑠 → ((𝑚 + (1 / 2)) · 𝑦) = ((𝑚 + (1 / 2)) · 𝑠))
292	291	fveq2d 6894	. . . . . . . . . . . . . 14 ⊢ (𝑦 = 𝑠 → (sin‘((𝑚 + (1 / 2)) · 𝑦)) = (sin‘((𝑚 + (1 / 2)) · 𝑠)))
293		oveq1 7431	. . . . . . . . . . . . . . . 16 ⊢ (𝑦 = 𝑠 → (𝑦 / 2) = (𝑠 / 2))
294	293	fveq2d 6894	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = 𝑠 → (sin‘(𝑦 / 2)) = (sin‘(𝑠 / 2)))
295	294	oveq2d 7440	. . . . . . . . . . . . . 14 ⊢ (𝑦 = 𝑠 → ((2 · π) · (sin‘(𝑦 / 2))) = ((2 · π) · (sin‘(𝑠 / 2))))
296	292, 295	oveq12d 7442	. . . . . . . . . . . . 13 ⊢ (𝑦 = 𝑠 → ((sin‘((𝑚 + (1 / 2)) · 𝑦)) / ((2 · π) · (sin‘(𝑦 / 2)))) = ((sin‘((𝑚 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2)))))
297	290, 296	ifbieq2d 4508	. . . . . . . . . . . 12 ⊢ (𝑦 = 𝑠 → if((𝑦 mod (2 · π)) = 0, (((2 · 𝑚) + 1) / (2 · π)), ((sin‘((𝑚 + (1 / 2)) · 𝑦)) / ((2 · π) · (sin‘(𝑦 / 2))))) = if((𝑠 mod (2 · π)) = 0, (((2 · 𝑚) + 1) / (2 · π)), ((sin‘((𝑚 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2))))))
298	297	cbvmptv 5208	. . . . . . . . . . 11 ⊢ (𝑦 ∈ ℝ ↦ if((𝑦 mod (2 · π)) = 0, (((2 · 𝑚) + 1) / (2 · π)), ((sin‘((𝑚 + (1 / 2)) · 𝑦)) / ((2 · π) · (sin‘(𝑦 / 2)))))) = (𝑠 ∈ ℝ ↦ if((𝑠 mod (2 · π)) = 0, (((2 · 𝑚) + 1) / (2 · π)), ((sin‘((𝑚 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2))))))
299		simpl 488	. . . . . . . . . . . . . . . 16 ⊢ ((𝑚 = 𝑘 ∧ 𝑠 ∈ ℝ) → 𝑚 = 𝑘)
300	299	oveq2d 7440	. . . . . . . . . . . . . . 15 ⊢ ((𝑚 = 𝑘 ∧ 𝑠 ∈ ℝ) → (2 · 𝑚) = (2 · 𝑘))
301	300	oveq1d 7439	. . . . . . . . . . . . . 14 ⊢ ((𝑚 = 𝑘 ∧ 𝑠 ∈ ℝ) → ((2 · 𝑚) + 1) = ((2 · 𝑘) + 1))
302	301	oveq1d 7439	. . . . . . . . . . . . 13 ⊢ ((𝑚 = 𝑘 ∧ 𝑠 ∈ ℝ) → (((2 · 𝑚) + 1) / (2 · π)) = (((2 · 𝑘) + 1) / (2 · π)))
303	299	oveq1d 7439	. . . . . . . . . . . . . . . 16 ⊢ ((𝑚 = 𝑘 ∧ 𝑠 ∈ ℝ) → (𝑚 + (1 / 2)) = (𝑘 + (1 / 2)))
304	303	oveq1d 7439	. . . . . . . . . . . . . . 15 ⊢ ((𝑚 = 𝑘 ∧ 𝑠 ∈ ℝ) → ((𝑚 + (1 / 2)) · 𝑠) = ((𝑘 + (1 / 2)) · 𝑠))
305	304	fveq2d 6894	. . . . . . . . . . . . . 14 ⊢ ((𝑚 = 𝑘 ∧ 𝑠 ∈ ℝ) → (sin‘((𝑚 + (1 / 2)) · 𝑠)) = (sin‘((𝑘 + (1 / 2)) · 𝑠)))
306	305	oveq1d 7439	. . . . . . . . . . . . 13 ⊢ ((𝑚 = 𝑘 ∧ 𝑠 ∈ ℝ) → ((sin‘((𝑚 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2)))) = ((sin‘((𝑘 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2)))))
307	302, 306	ifeq12d 4503	. . . . . . . . . . . 12 ⊢ ((𝑚 = 𝑘 ∧ 𝑠 ∈ ℝ) → if((𝑠 mod (2 · π)) = 0, (((2 · 𝑚) + 1) / (2 · π)), ((sin‘((𝑚 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2))))) = if((𝑠 mod (2 · π)) = 0, (((2 · 𝑘) + 1) / (2 · π)), ((sin‘((𝑘 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2))))))
308	307	mpteq2dva 5197	. . . . . . . . . . 11 ⊢ (𝑚 = 𝑘 → (𝑠 ∈ ℝ ↦ if((𝑠 mod (2 · π)) = 0, (((2 · 𝑚) + 1) / (2 · π)), ((sin‘((𝑚 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2)))))) = (𝑠 ∈ ℝ ↦ if((𝑠 mod (2 · π)) = 0, (((2 · 𝑘) + 1) / (2 · π)), ((sin‘((𝑘 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2)))))))
309	298, 308	eqtrid 2807	. . . . . . . . . 10 ⊢ (𝑚 = 𝑘 → (𝑦 ∈ ℝ ↦ if((𝑦 mod (2 · π)) = 0, (((2 · 𝑚) + 1) / (2 · π)), ((sin‘((𝑚 + (1 / 2)) · 𝑦)) / ((2 · π) · (sin‘(𝑦 / 2)))))) = (𝑠 ∈ ℝ ↦ if((𝑠 mod (2 · π)) = 0, (((2 · 𝑘) + 1) / (2 · π)), ((sin‘((𝑘 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2)))))))
310	309	cbvmptv 5208	. . . . . . . . 9 ⊢ (𝑚 ∈ ℕ ↦ (𝑦 ∈ ℝ ↦ if((𝑦 mod (2 · π)) = 0, (((2 · 𝑚) + 1) / (2 · π)), ((sin‘((𝑚 + (1 / 2)) · 𝑦)) / ((2 · π) · (sin‘(𝑦 / 2))))))) = (𝑘 ∈ ℕ ↦ (𝑠 ∈ ℝ ↦ if((𝑠 mod (2 · π)) = 0, (((2 · 𝑘) + 1) / (2 · π)), ((sin‘((𝑘 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2)))))))
311	288, 310	eqtri 2783	. . . . . . . 8 ⊢ 𝐷 = (𝑘 ∈ ℕ ↦ (𝑠 ∈ ℝ ↦ if((𝑠 mod (2 · π)) = 0, (((2 · 𝑘) + 1) / (2 · π)), ((sin‘((𝑘 + (1 / 2)) · 𝑠)) / ((2 · π) · (sin‘(𝑠 / 2)))))))
312		eqid 2760	. . . . . . . 8 ⊢ ((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟))) ↾ ( -π[,]𝑙)) = ((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟))) ↾ ( -π[,]𝑙))
313		eqid 2760	. . . . . . . 8 ⊢ ({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙))) = ({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))
314		eqid 2760	. . . . . . . 8 ⊢ ((♯‘({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) − 1) = ((♯‘({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) − 1)
315		isoeq1 7329	. . . . . . . . 9 ⊢ (𝑢 = 𝑤 → (𝑢 Isom < , < ((0...((♯‘({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) − 1)), ({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) ↔ 𝑤 Isom < , < ((0...((♯‘({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) − 1)), ({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙))))))
316	315	cbviotavw 6505	. . . . . . . 8 ⊢ (℩𝑢𝑢 Isom < , < ((0...((♯‘({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) − 1)), ({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙))))) = (℩𝑤𝑤 Isom < , < ((0...((♯‘({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) − 1)), ({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))))
317		fveq2 6890	. . . . . . . . . 10 ⊢ (𝑗 = 𝑖 → (𝑉‘𝑗) = (𝑉‘𝑖))
318	317	oveq1d 7439	. . . . . . . . 9 ⊢ (𝑗 = 𝑖 → ((𝑉‘𝑗) − 𝑋) = ((𝑉‘𝑖) − 𝑋))
319	318	cbvmptv 5208	. . . . . . . 8 ⊢ (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) = (𝑖 ∈ (0...𝑁) ↦ ((𝑉‘𝑖) − 𝑋))
320		eqid 2760	. . . . . . . 8 ⊢ (℩𝑚 ∈ (0..^𝑁)(((℩𝑢𝑢 Isom < , < ((0...((♯‘({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) − 1)), ({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))))‘𝑏)(,)((℩𝑢𝑢 Isom < , < ((0...((♯‘({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) − 1)), ({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))))‘(𝑏 + 1))) ⊆ (((𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋))‘𝑚)(,)((𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋))‘(𝑚 + 1)))) = (℩𝑚 ∈ (0..^𝑁)(((℩𝑢𝑢 Isom < , < ((0...((♯‘({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) − 1)), ({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))))‘𝑏)(,)((℩𝑢𝑢 Isom < , < ((0...((♯‘({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))) − 1)), ({ -π, 𝑙} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ ( -π(,)𝑙)))))‘(𝑏 + 1))) ⊆ (((𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋))‘𝑚)(,)((𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋))‘(𝑚 + 1))))
321		fveq2 6890	. . . . . . . . . . . . . 14 ⊢ (𝑎 = 𝑠 → ((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) = ((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠))
322		oveq2 7432	. . . . . . . . . . . . . . 15 ⊢ (𝑎 = 𝑠 → ((𝑏 + (1 / 2)) · 𝑎) = ((𝑏 + (1 / 2)) · 𝑠))
323	322	fveq2d 6894	. . . . . . . . . . . . . 14 ⊢ (𝑎 = 𝑠 → (sin‘((𝑏 + (1 / 2)) · 𝑎)) = (sin‘((𝑏 + (1 / 2)) · 𝑠)))
324	321, 323	oveq12d 7442	. . . . . . . . . . . . 13 ⊢ (𝑎 = 𝑠 → (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) = (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))))
325	324	cbvitgv 26106	. . . . . . . . . . . 12 ⊢ ∫(𝑙(,)0)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎 = ∫(𝑙(,)0)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠
326	325	fveq2i 6893	. . . . . . . . . . 11 ⊢ (abs‘∫(𝑙(,)0)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) = (abs‘∫(𝑙(,)0)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠)
327	326	breq1i 5109	. . . . . . . . . 10 ⊢ ((abs‘∫(𝑙(,)0)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) < (𝑖 / 2) ↔ (abs‘∫(𝑙(,)0)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠) < (𝑖 / 2))
328	327	anbi2i 635	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝑖 ∈ ℝ⁺) ∧ 𝑙 ∈ ( -π(,)0)) ∧ 𝑏 ∈ ℕ) ∧ (abs‘∫(𝑙(,)0)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) < (𝑖 / 2)) ↔ ((((𝜑 ∧ 𝑖 ∈ ℝ⁺) ∧ 𝑙 ∈ ( -π(,)0)) ∧ 𝑏 ∈ ℕ) ∧ (abs‘∫(𝑙(,)0)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠) < (𝑖 / 2)))
329	324	cbvitgv 26106	. . . . . . . . . . 11 ⊢ ∫( -π(,)𝑙)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎 = ∫( -π(,)𝑙)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠
330	329	fveq2i 6893	. . . . . . . . . 10 ⊢ (abs‘∫( -π(,)𝑙)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) = (abs‘∫( -π(,)𝑙)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠)
331	330	breq1i 5109	. . . . . . . . 9 ⊢ ((abs‘∫( -π(,)𝑙)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) < (𝑖 / 2) ↔ (abs‘∫( -π(,)𝑙)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠) < (𝑖 / 2))
332	328, 331	anbi12i 640	. . . . . . . 8 ⊢ ((((((𝜑 ∧ 𝑖 ∈ ℝ⁺) ∧ 𝑙 ∈ ( -π(,)0)) ∧ 𝑏 ∈ ℕ) ∧ (abs‘∫(𝑙(,)0)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) < (𝑖 / 2)) ∧ (abs‘∫( -π(,)𝑙)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) < (𝑖 / 2)) ↔ (((((𝜑 ∧ 𝑖 ∈ ℝ⁺) ∧ 𝑙 ∈ ( -π(,)0)) ∧ 𝑏 ∈ ℕ) ∧ (abs‘∫(𝑙(,)0)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠) < (𝑖 / 2)) ∧ (abs‘∫( -π(,)𝑙)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠) < (𝑖 / 2)))
333	43, 44, 45, 76, 77, 78, 122, 132, 182, 213, 225, 236, 246, 254, 258, 261, 265, 271, 283, 284, 285, 286, 287, 311, 312, 313, 314, 316, 319, 320, 332	fourierdlem103 47355	. . . . . . 7 ⊢ (𝜑 → (𝑚 ∈ ℕ ↦ ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠) ⇝ (𝐿 / 2))
334		nnex 12348	. . . . . . . . . 10 ⊢ ℕ ∈ V
335	334	mptex 7233	. . . . . . . . 9 ⊢ (𝑚 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))) ∈ V
336	28, 335	eqeltri 2856	. . . . . . . 8 ⊢ 𝑍 ∈ V
337	336	a1i 11	. . . . . . 7 ⊢ (𝜑 → 𝑍 ∈ V)
338	268	adantr 486	. . . . . . . . . 10 ⊢ ((𝑚 = 𝑛 ∧ 𝑠 ∈ (0(,)π)) → ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) = ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)))
339	338	itgeq2dv 26111	. . . . . . . . 9 ⊢ (𝑚 = 𝑛 → ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠 = ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠)
340	339	cbvmptv 5208	. . . . . . . 8 ⊢ (𝑚 ∈ ℕ ↦ ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠) = (𝑛 ∈ ℕ ↦ ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠)
341	279	adantr 486	. . . . . . . . . . 11 ⊢ ((𝑐 = 𝑘 ∧ 𝑠 ∈ (0(,)π)) → ((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) = ((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠))
342	341	itgeq2dv 26111	. . . . . . . . . 10 ⊢ (𝑐 = 𝑘 → ∫(0(,)π)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠 = ∫(0(,)π)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠)
343	342	oveq1d 7439	. . . . . . . . 9 ⊢ (𝑐 = 𝑘 → (∫(0(,)π)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠 / π) = (∫(0(,)π)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠 / π))
344	343	cbvmptv 5208	. . . . . . . 8 ⊢ (𝑐 ∈ ℕ ↦ (∫(0(,)π)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑐 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠 / π)) = (𝑘 ∈ ℕ ↦ (∫(0(,)π)((𝑧 ∈ ( -π[,]π) ↦ (((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑧) · ((𝑑 ∈ ( -π[,]π) ↦ (sin‘((𝑘 + (1 / 2)) · 𝑑)))‘𝑧)))‘𝑠) d𝑠 / π))
345		eqid 2760	. . . . . . . 8 ⊢ ((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟))) ↾ (𝑒[,]π)) = ((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟))) ↾ (𝑒[,]π))
346		eqid 2760	. . . . . . . 8 ⊢ ({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π))) = ({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))
347		eqid 2760	. . . . . . . 8 ⊢ ((♯‘({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) − 1) = ((♯‘({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) − 1)
348		isoeq1 7329	. . . . . . . . 9 ⊢ (𝑢 = 𝑣 → (𝑢 Isom < , < ((0...((♯‘({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) − 1)), ({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) ↔ 𝑣 Isom < , < ((0...((♯‘({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) − 1)), ({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π))))))
349	348	cbviotavw 6505	. . . . . . . 8 ⊢ (℩𝑢𝑢 Isom < , < ((0...((♯‘({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) − 1)), ({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π))))) = (℩𝑣𝑣 Isom < , < ((0...((♯‘({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) − 1)), ({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))))
350		eqid 2760	. . . . . . . 8 ⊢ (℩𝑎 ∈ (0..^𝑁)(((℩𝑢𝑢 Isom < , < ((0...((♯‘({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) − 1)), ({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))))‘𝑏)(,)((℩𝑢𝑢 Isom < , < ((0...((♯‘({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) − 1)), ({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))))‘(𝑏 + 1))) ⊆ (((𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋))‘𝑎)(,)((𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋))‘(𝑎 + 1)))) = (℩𝑎 ∈ (0..^𝑁)(((℩𝑢𝑢 Isom < , < ((0...((♯‘({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) − 1)), ({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))))‘𝑏)(,)((℩𝑢𝑢 Isom < , < ((0...((♯‘({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))) − 1)), ({𝑒, π} ∪ (ran (𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋)) ∩ (𝑒(,)π)))))‘(𝑏 + 1))) ⊆ (((𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋))‘𝑎)(,)((𝑗 ∈ (0...𝑁) ↦ ((𝑉‘𝑗) − 𝑋))‘(𝑎 + 1))))
351	324	cbvitgv 26106	. . . . . . . . . . . 12 ⊢ ∫(0(,)𝑒)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎 = ∫(0(,)𝑒)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠
352	351	fveq2i 6893	. . . . . . . . . . 11 ⊢ (abs‘∫(0(,)𝑒)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) = (abs‘∫(0(,)𝑒)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠)
353	352	breq1i 5109	. . . . . . . . . 10 ⊢ ((abs‘∫(0(,)𝑒)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) < (𝑞 / 2) ↔ (abs‘∫(0(,)𝑒)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠) < (𝑞 / 2))
354	353	anbi2i 635	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝑞 ∈ ℝ⁺) ∧ 𝑒 ∈ (0(,)π)) ∧ 𝑏 ∈ ℕ) ∧ (abs‘∫(0(,)𝑒)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) < (𝑞 / 2)) ↔ ((((𝜑 ∧ 𝑞 ∈ ℝ⁺) ∧ 𝑒 ∈ (0(,)π)) ∧ 𝑏 ∈ ℕ) ∧ (abs‘∫(0(,)𝑒)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠) < (𝑞 / 2)))
355	324	cbvitgv 26106	. . . . . . . . . . 11 ⊢ ∫(𝑒(,)π)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎 = ∫(𝑒(,)π)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠
356	355	fveq2i 6893	. . . . . . . . . 10 ⊢ (abs‘∫(𝑒(,)π)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) = (abs‘∫(𝑒(,)π)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠)
357	356	breq1i 5109	. . . . . . . . 9 ⊢ ((abs‘∫(𝑒(,)π)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) < (𝑞 / 2) ↔ (abs‘∫(𝑒(,)π)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠) < (𝑞 / 2))
358	354, 357	anbi12i 640	. . . . . . . 8 ⊢ ((((((𝜑 ∧ 𝑞 ∈ ℝ⁺) ∧ 𝑒 ∈ (0(,)π)) ∧ 𝑏 ∈ ℕ) ∧ (abs‘∫(0(,)𝑒)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) < (𝑞 / 2)) ∧ (abs‘∫(𝑒(,)π)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑎) · (sin‘((𝑏 + (1 / 2)) · 𝑎))) d𝑎) < (𝑞 / 2)) ↔ (((((𝜑 ∧ 𝑞 ∈ ℝ⁺) ∧ 𝑒 ∈ (0(,)π)) ∧ 𝑏 ∈ ℕ) ∧ (abs‘∫(0(,)𝑒)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠) < (𝑞 / 2)) ∧ (abs‘∫(𝑒(,)π)(((𝑟 ∈ ( -π[,]π) ↦ (((𝑔 ∈ ( -π[,]π) ↦ if(𝑔 = 0, 0, (((𝐹‘(𝑋 + 𝑔)) − if(0 < 𝑔, 𝑅, 𝐿)) / 𝑔)))‘𝑟) · ((𝑜 ∈ ( -π[,]π) ↦ if(𝑜 = 0, 1, (𝑜 / (2 · (sin‘(𝑜 / 2))))))‘𝑟)))‘𝑠) · (sin‘((𝑏 + (1 / 2)) · 𝑠))) d𝑠) < (𝑞 / 2)))
359	43, 44, 45, 76, 77, 78, 122, 132, 182, 213, 225, 236, 246, 254, 258, 261, 265, 340, 344, 284, 285, 286, 287, 311, 345, 346, 347, 349, 319, 350, 358	fourierdlem104 47356	. . . . . . 7 ⊢ (𝜑 → (𝑚 ∈ ℕ ↦ ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠) ⇝ (𝑅 / 2))
360		eqidd 2761	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑚 ∈ ℕ ↦ ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠) = (𝑚 ∈ ℕ ↦ ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠))
361	270	adantl 487	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑚 = 𝑛) → ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠 = ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠)
362		simpr 490	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝑛 ∈ ℕ)
363		elioore 13513	. . . . . . . . . . 11 ⊢ (𝑠 ∈ ( -π(,)0) → 𝑠 ∈ ℝ)
364	43	adantr 486	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑠 ∈ ℝ) → 𝐹:ℝ⟶ℝ)
365	44	adantr 486	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑠 ∈ ℝ) → 𝑋 ∈ ℝ)
366		simpr 490	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑠 ∈ ℝ) → 𝑠 ∈ ℝ)
367	365, 366	readdcld 11345	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑠 ∈ ℝ) → (𝑋 + 𝑠) ∈ ℝ)
368	364, 367	ffvelcdmd 7090	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑠 ∈ ℝ) → (𝐹‘(𝑋 + 𝑠)) ∈ ℝ)
369	368	adantlr 728	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑠 ∈ ℝ) → (𝐹‘(𝑋 + 𝑠)) ∈ ℝ)
370	288	dirkerre 47241	. . . . . . . . . . . . 13 ⊢ ((𝑛 ∈ ℕ ∧ 𝑠 ∈ ℝ) → ((𝐷‘𝑛)‘𝑠) ∈ ℝ)
371	370	adantll 727	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑠 ∈ ℝ) → ((𝐷‘𝑛)‘𝑠) ∈ ℝ)
372	369, 371	remulcld 11346	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑠 ∈ ℝ) → ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) ∈ ℝ)
373	363, 372	sylan2 605	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑠 ∈ ( -π(,)0)) → ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) ∈ ℝ)
374		ioossicc 13571	. . . . . . . . . . . . 13 ⊢ ( -π(,)0) ⊆ ( -π[,]0)
375	61	leidi 11857	. . . . . . . . . . . . . 14 ⊢ -π ≤ -π
376	62, 54, 60	ltleii 11440	. . . . . . . . . . . . . 14 ⊢ 0 ≤ π
377		iccss 13552	. . . . . . . . . . . . . 14 ⊢ ((( -π ∈ ℝ ∧ π ∈ ℝ) ∧ ( -π ≤ -π ∧ 0 ≤ π)) → ( -π[,]0) ⊆ ( -π[,]π))
378	61, 54, 375, 376, 377	mp4an 706	. . . . . . . . . . . . 13 ⊢ ( -π[,]0) ⊆ ( -π[,]π)
379	374, 378	sstri 3918	. . . . . . . . . . . 12 ⊢ ( -π(,)0) ⊆ ( -π[,]π)
380	379	a1i 11	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ( -π(,)0) ⊆ ( -π[,]π))
381		ioombl 25895	. . . . . . . . . . . 12 ⊢ ( -π(,)0) ∈ dom vol
382	381	a1i 11	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ( -π(,)0) ∈ dom vol)
383	43	adantr 486	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑠 ∈ ( -π[,]π)) → 𝐹:ℝ⟶ℝ)
384	44	adantr 486	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑠 ∈ ( -π[,]π)) → 𝑋 ∈ ℝ)
385	56, 55	iccssred 13572	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → ( -π[,]π) ⊆ ℝ)
386	385	sselda 3909	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑠 ∈ ( -π[,]π)) → 𝑠 ∈ ℝ)
387	384, 386	readdcld 11345	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑠 ∈ ( -π[,]π)) → (𝑋 + 𝑠) ∈ ℝ)
388	383, 387	ffvelcdmd 7090	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑠 ∈ ( -π[,]π)) → (𝐹‘(𝑋 + 𝑠)) ∈ ℝ)
389	388	adantlr 728	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑠 ∈ ( -π[,]π)) → (𝐹‘(𝑋 + 𝑠)) ∈ ℝ)
390		iccssre 13567	. . . . . . . . . . . . . . . 16 ⊢ (( -π ∈ ℝ ∧ π ∈ ℝ) → ( -π[,]π) ⊆ ℝ)
391	61, 54, 390	mp2an 705	. . . . . . . . . . . . . . 15 ⊢ ( -π[,]π) ⊆ ℝ
392	391	sseli 3905	. . . . . . . . . . . . . 14 ⊢ (𝑠 ∈ ( -π[,]π) → 𝑠 ∈ ℝ)
393	392, 370	sylan2 605	. . . . . . . . . . . . 13 ⊢ ((𝑛 ∈ ℕ ∧ 𝑠 ∈ ( -π[,]π)) → ((𝐷‘𝑛)‘𝑠) ∈ ℝ)
394	393	adantll 727	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑠 ∈ ( -π[,]π)) → ((𝐷‘𝑛)‘𝑠) ∈ ℝ)
395	389, 394	remulcld 11346	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑠 ∈ ( -π[,]π)) → ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) ∈ ℝ)
396	61	a1i 11	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → -π ∈ ℝ)
397	54	a1i 11	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → π ∈ ℝ)
398	43	adantr 486	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝐹:ℝ⟶ℝ)
399	44	adantr 486	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝑋 ∈ ℝ)
400	76	adantr 486	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝑁 ∈ ℕ)
401	77	adantr 486	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝑉 ∈ ((𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = ( -π + 𝑋) ∧ (𝑝‘𝑛) = (π + 𝑋)) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))})‘𝑁))
402	122	adantlr 728	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑖 ∈ (0..^𝑁)) → (𝐹 ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) ∈ (((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))–cn→ℂ))
403	225	adantlr 728	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑖 ∈ (0..^𝑁)) → if(((𝑑 ∈ ( -π(,]π) ↦ if(𝑑 = π, -π, 𝑑))‘((𝑐 ∈ ℝ ↦ (𝑐 + ((⌊‘((π − 𝑐) / 𝑇)) · 𝑇)))‘(𝑉‘𝑖))) = (𝑄‘((𝑦 ∈ ℝ ↦ sup({𝑓 ∈ (0..^𝑀) ∣ (𝑄‘𝑓) ≤ ((𝑑 ∈ ( -π(,]π) ↦ if(𝑑 = π, -π, 𝑑))‘((𝑐 ∈ ℝ ↦ (𝑐 + ((⌊‘((π − 𝑐) / 𝑇)) · 𝑇)))‘𝑦))}, ℝ, < ))‘(𝑉‘𝑖))), ((𝑗 ∈ (0..^𝑀) ↦ ⦋𝑗 / 𝑖⦌𝐶)‘((𝑦 ∈ ℝ ↦ sup({𝑓 ∈ (0..^𝑀) ∣ (𝑄‘𝑓) ≤ ((𝑑 ∈ ( -π(,]π) ↦ if(𝑑 = π, -π, 𝑑))‘((𝑐 ∈ ℝ ↦ (𝑐 + ((⌊‘((π − 𝑐) / 𝑇)) · 𝑇)))‘𝑦))}, ℝ, < ))‘(𝑉‘𝑖))), (𝐹‘((𝑑 ∈ ( -π(,]π) ↦ if(𝑑 = π, -π, 𝑑))‘((𝑐 ∈ ℝ ↦ (𝑐 + ((⌊‘((π − 𝑐) / 𝑇)) · 𝑇)))‘(𝑉‘𝑖))))) ∈ ((𝐹 ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) lim_ℂ (𝑉‘𝑖)))
404	236	adantlr 728	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑖 ∈ (0..^𝑁)) → if(((𝑒 ∈ ℝ ↦ (𝑒 + ((⌊‘((π − 𝑒) / 𝑇)) · 𝑇)))‘(𝑉‘(𝑖 + 1))) = (𝑄‘(((𝑦 ∈ ℝ ↦ sup({ℎ ∈ (0..^𝑀) ∣ (𝑄‘ℎ) ≤ ((𝑔 ∈ ( -π(,]π) ↦ if(𝑔 = π, -π, 𝑔))‘((𝑒 ∈ ℝ ↦ (𝑒 + ((⌊‘((π − 𝑒) / 𝑇)) · 𝑇)))‘𝑦))}, ℝ, < ))‘(𝑉‘𝑖)) + 1)), ((𝑗 ∈ (0..^𝑀) ↦ ⦋𝑗 / 𝑖⦌𝑈)‘((𝑦 ∈ ℝ ↦ sup({ℎ ∈ (0..^𝑀) ∣ (𝑄‘ℎ) ≤ ((𝑔 ∈ ( -π(,]π) ↦ if(𝑔 = π, -π, 𝑔))‘((𝑒 ∈ ℝ ↦ (𝑒 + ((⌊‘((π − 𝑒) / 𝑇)) · 𝑇)))‘𝑦))}, ℝ, < ))‘(𝑉‘𝑖))), (𝐹‘((𝑒 ∈ ℝ ↦ (𝑒 + ((⌊‘((π − 𝑒) / 𝑇)) · 𝑇)))‘(𝑉‘(𝑖 + 1))))) ∈ ((𝐹 ↾ ((𝑉‘𝑖)(,)(𝑉‘(𝑖 + 1)))) lim_ℂ (𝑉‘(𝑖 + 1))))
405	288	dirkercncf 47253	. . . . . . . . . . . . 13 ⊢ (𝑛 ∈ ℕ → (𝐷‘𝑛) ∈ (ℝ–cn→ℝ))
406	405	adantl 487	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐷‘𝑛) ∈ (ℝ–cn→ℝ))
407		eqid 2760	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ ( -π[,]π) ↦ ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠))) = (𝑠 ∈ ( -π[,]π) ↦ ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)))
408	396, 397, 398, 399, 45, 400, 401, 402, 403, 404, 319, 51, 406, 407	fourierdlem84 47336	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑠 ∈ ( -π[,]π) ↦ ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠))) ∈ 𝐿¹)
409	380, 382, 395, 408	iblss 26134	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑠 ∈ ( -π(,)0) ↦ ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠))) ∈ 𝐿¹)
410	373, 409	itgcl 26113	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠 ∈ ℂ)
411	360, 361, 362, 410	fvmptd 7006	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ((𝑚 ∈ ℕ ↦ ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)‘𝑛) = ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠)
412	411, 410	eqeltrd 2860	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ((𝑚 ∈ ℕ ↦ ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)‘𝑛) ∈ ℂ)
413		eqidd 2761	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑚 ∈ ℕ ↦ ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠) = (𝑚 ∈ ℕ ↦ ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠))
414	339	adantl 487	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑚 = 𝑛) → ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠 = ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠)
415	43	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑠 ∈ (0(,)π)) → 𝐹:ℝ⟶ℝ)
416	44	adantr 486	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑠 ∈ (0(,)π)) → 𝑋 ∈ ℝ)
417		elioore 13513	. . . . . . . . . . . . . . 15 ⊢ (𝑠 ∈ (0(,)π) → 𝑠 ∈ ℝ)
418	417	adantl 487	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑠 ∈ (0(,)π)) → 𝑠 ∈ ℝ)
419	416, 418	readdcld 11345	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑠 ∈ (0(,)π)) → (𝑋 + 𝑠) ∈ ℝ)
420	415, 419	ffvelcdmd 7090	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑠 ∈ (0(,)π)) → (𝐹‘(𝑋 + 𝑠)) ∈ ℝ)
421	420	adantlr 728	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑠 ∈ (0(,)π)) → (𝐹‘(𝑋 + 𝑠)) ∈ ℝ)
422	417, 370	sylan2 605	. . . . . . . . . . . 12 ⊢ ((𝑛 ∈ ℕ ∧ 𝑠 ∈ (0(,)π)) → ((𝐷‘𝑛)‘𝑠) ∈ ℝ)
423	422	adantll 727	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑠 ∈ (0(,)π)) → ((𝐷‘𝑛)‘𝑠) ∈ ℝ)
424	421, 423	remulcld 11346	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑠 ∈ (0(,)π)) → ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) ∈ ℝ)
425		ioossicc 13571	. . . . . . . . . . . . 13 ⊢ (0(,)π) ⊆ (0[,]π)
426	61, 62, 59	ltleii 11440	. . . . . . . . . . . . . 14 ⊢ -π ≤ 0
427	54	leidi 11857	. . . . . . . . . . . . . 14 ⊢ π ≤ π
428		iccss 13552	. . . . . . . . . . . . . 14 ⊢ ((( -π ∈ ℝ ∧ π ∈ ℝ) ∧ ( -π ≤ 0 ∧ π ≤ π)) → (0[,]π) ⊆ ( -π[,]π))
429	61, 54, 426, 427, 428	mp4an 706	. . . . . . . . . . . . 13 ⊢ (0[,]π) ⊆ ( -π[,]π)
430	425, 429	sstri 3918	. . . . . . . . . . . 12 ⊢ (0(,)π) ⊆ ( -π[,]π)
431	430	a1i 11	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (0(,)π) ⊆ ( -π[,]π))
432		ioombl 25895	. . . . . . . . . . . 12 ⊢ (0(,)π) ∈ dom vol
433	432	a1i 11	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (0(,)π) ∈ dom vol)
434	431, 433, 395, 408	iblss 26134	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑠 ∈ (0(,)π) ↦ ((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠))) ∈ 𝐿¹)
435	424, 434	itgcl 26113	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠 ∈ ℂ)
436	413, 414, 362, 435	fvmptd 7006	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ((𝑚 ∈ ℕ ↦ ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)‘𝑛) = ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠)
437	436, 435	eqeltrd 2860	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ((𝑚 ∈ ℕ ↦ ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)‘𝑛) ∈ ℂ)
438		eleq1w 2843	. . . . . . . . . . 11 ⊢ (𝑚 = 𝑛 → (𝑚 ∈ ℕ ↔ 𝑛 ∈ ℕ))
439	438	anbi2d 642	. . . . . . . . . 10 ⊢ (𝑚 = 𝑛 → ((𝜑 ∧ 𝑚 ∈ ℕ) ↔ (𝜑 ∧ 𝑛 ∈ ℕ)))
440		fveq2 6890	. . . . . . . . . . 11 ⊢ (𝑚 = 𝑛 → (𝑍‘𝑚) = (𝑍‘𝑛))
441	270, 339	oveq12d 7442	. . . . . . . . . . 11 ⊢ (𝑚 = 𝑛 → (∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠 + ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠) = (∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠 + ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠))
442	440, 441	eqeq12d 2776	. . . . . . . . . 10 ⊢ (𝑚 = 𝑛 → ((𝑍‘𝑚) = (∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠 + ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠) ↔ (𝑍‘𝑛) = (∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠 + ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠)))
443	439, 442	imbi12d 347	. . . . . . . . 9 ⊢ (𝑚 = 𝑛 → (((𝜑 ∧ 𝑚 ∈ ℕ) → (𝑍‘𝑚) = (∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠 + ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)) ↔ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑍‘𝑛) = (∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠 + ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠))))
444		oveq1 7431	. . . . . . . . . . . . . . . . 17 ⊢ (𝑛 = 𝑚 → (𝑛 · 𝑥) = (𝑚 · 𝑥))
445	444	fveq2d 6894	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 𝑚 → (cos‘(𝑛 · 𝑥)) = (cos‘(𝑚 · 𝑥)))
446	445	oveq2d 7440	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 𝑚 → ((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) = ((𝐹‘𝑥) · (cos‘(𝑚 · 𝑥))))
447	446	adantr 486	. . . . . . . . . . . . . 14 ⊢ ((𝑛 = 𝑚 ∧ 𝑥 ∈ ( -π(,)π)) → ((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) = ((𝐹‘𝑥) · (cos‘(𝑚 · 𝑥))))
448	447	itgeq2dv 26111	. . . . . . . . . . . . 13 ⊢ (𝑛 = 𝑚 → ∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) d𝑥 = ∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑚 · 𝑥))) d𝑥)
449	448	oveq1d 7439	. . . . . . . . . . . 12 ⊢ (𝑛 = 𝑚 → (∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) d𝑥 / π) = (∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑚 · 𝑥))) d𝑥 / π))
450	449	cbvmptv 5208	. . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ₀ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) d𝑥 / π)) = (𝑚 ∈ ℕ₀ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑚 · 𝑥))) d𝑥 / π))
451	29, 450	eqtri 2783	. . . . . . . . . 10 ⊢ 𝐴 = (𝑚 ∈ ℕ₀ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑚 · 𝑥))) d𝑥 / π))
452		fourierdlem112.b	. . . . . . . . . . 11 ⊢ 𝐵 = (𝑛 ∈ ℕ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (sin‘(𝑛 · 𝑥))) d𝑥 / π))
453	444	fveq2d 6894	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 𝑚 → (sin‘(𝑛 · 𝑥)) = (sin‘(𝑚 · 𝑥)))
454	453	oveq2d 7440	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 𝑚 → ((𝐹‘𝑥) · (sin‘(𝑛 · 𝑥))) = ((𝐹‘𝑥) · (sin‘(𝑚 · 𝑥))))
455	454	adantr 486	. . . . . . . . . . . . . 14 ⊢ ((𝑛 = 𝑚 ∧ 𝑥 ∈ ( -π(,)π)) → ((𝐹‘𝑥) · (sin‘(𝑛 · 𝑥))) = ((𝐹‘𝑥) · (sin‘(𝑚 · 𝑥))))
456	455	itgeq2dv 26111	. . . . . . . . . . . . 13 ⊢ (𝑛 = 𝑚 → ∫( -π(,)π)((𝐹‘𝑥) · (sin‘(𝑛 · 𝑥))) d𝑥 = ∫( -π(,)π)((𝐹‘𝑥) · (sin‘(𝑚 · 𝑥))) d𝑥)
457	456	oveq1d 7439	. . . . . . . . . . . 12 ⊢ (𝑛 = 𝑚 → (∫( -π(,)π)((𝐹‘𝑥) · (sin‘(𝑛 · 𝑥))) d𝑥 / π) = (∫( -π(,)π)((𝐹‘𝑥) · (sin‘(𝑚 · 𝑥))) d𝑥 / π))
458	457	cbvmptv 5208	. . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (sin‘(𝑛 · 𝑥))) d𝑥 / π)) = (𝑚 ∈ ℕ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (sin‘(𝑚 · 𝑥))) d𝑥 / π))
459	452, 458	eqtri 2783	. . . . . . . . . 10 ⊢ 𝐵 = (𝑚 ∈ ℕ ↦ (∫( -π(,)π)((𝐹‘𝑥) · (sin‘(𝑚 · 𝑥))) d𝑥 / π))
460		fveq2 6890	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 𝑘 → (𝐴‘𝑛) = (𝐴‘𝑘))
461		oveq1 7431	. . . . . . . . . . . . . . . . 17 ⊢ (𝑛 = 𝑘 → (𝑛 · 𝑋) = (𝑘 · 𝑋))
462	461	fveq2d 6894	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 𝑘 → (cos‘(𝑛 · 𝑋)) = (cos‘(𝑘 · 𝑋)))
463	460, 462	oveq12d 7442	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 𝑘 → ((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) = ((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))))
464		fveq2 6890	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 𝑘 → (𝐵‘𝑛) = (𝐵‘𝑘))
465	461	fveq2d 6894	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 𝑘 → (sin‘(𝑛 · 𝑋)) = (sin‘(𝑘 · 𝑋)))
466	464, 465	oveq12d 7442	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 𝑘 → ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))) = ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))
467	463, 466	oveq12d 7442	. . . . . . . . . . . . . 14 ⊢ (𝑛 = 𝑘 → (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))) = (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
468	467	cbvsumv 15872	. . . . . . . . . . . . 13 ⊢ Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))) = Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))
469	468	oveq2i 7435	. . . . . . . . . . . 12 ⊢ (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) = (((𝐴‘0) / 2) + Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
470	469	mpteq2i 5200	. . . . . . . . . . 11 ⊢ (𝑚 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))) = (𝑚 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))))
471		oveq2 7432	. . . . . . . . . . . . . . 15 ⊢ (𝑚 = 𝑛 → (1...𝑚) = (1...𝑛))
472	471	sumeq1d 15876	. . . . . . . . . . . . . 14 ⊢ (𝑚 = 𝑛 → Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
473	472	oveq2d 7440	. . . . . . . . . . . . 13 ⊢ (𝑚 = 𝑛 → (((𝐴‘0) / 2) + Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))) = (((𝐴‘0) / 2) + Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))))
474	473	cbvmptv 5208	. . . . . . . . . . . 12 ⊢ (𝑚 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))) = (𝑛 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))))
475		fveq2 6890	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 = 𝑚 → (𝐴‘𝑘) = (𝐴‘𝑚))
476		oveq1 7431	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑘 = 𝑚 → (𝑘 · 𝑋) = (𝑚 · 𝑋))
477	476	fveq2d 6894	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 = 𝑚 → (cos‘(𝑘 · 𝑋)) = (cos‘(𝑚 · 𝑋)))
478	475, 477	oveq12d 7442	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 = 𝑚 → ((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) = ((𝐴‘𝑚) · (cos‘(𝑚 · 𝑋))))
479		fveq2 6890	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 = 𝑚 → (𝐵‘𝑘) = (𝐵‘𝑚))
480	476	fveq2d 6894	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 = 𝑚 → (sin‘(𝑘 · 𝑋)) = (sin‘(𝑚 · 𝑋)))
481	479, 480	oveq12d 7442	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 = 𝑚 → ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))) = ((𝐵‘𝑚) · (sin‘(𝑚 · 𝑋))))
482	478, 481	oveq12d 7442	. . . . . . . . . . . . . . 15 ⊢ (𝑘 = 𝑚 → (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = (((𝐴‘𝑚) · (cos‘(𝑚 · 𝑋))) + ((𝐵‘𝑚) · (sin‘(𝑚 · 𝑋)))))
483	482	cbvsumv 15872	. . . . . . . . . . . . . 14 ⊢ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = Σ𝑚 ∈ (1...𝑛)(((𝐴‘𝑚) · (cos‘(𝑚 · 𝑋))) + ((𝐵‘𝑚) · (sin‘(𝑚 · 𝑋))))
484	483	oveq2i 7435	. . . . . . . . . . . . 13 ⊢ (((𝐴‘0) / 2) + Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))) = (((𝐴‘0) / 2) + Σ𝑚 ∈ (1...𝑛)(((𝐴‘𝑚) · (cos‘(𝑚 · 𝑋))) + ((𝐵‘𝑚) · (sin‘(𝑚 · 𝑋)))))
485	484	mpteq2i 5200	. . . . . . . . . . . 12 ⊢ (𝑛 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))) = (𝑛 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑚 ∈ (1...𝑛)(((𝐴‘𝑚) · (cos‘(𝑚 · 𝑋))) + ((𝐵‘𝑚) · (sin‘(𝑚 · 𝑋))))))
486	474, 485	eqtri 2783	. . . . . . . . . . 11 ⊢ (𝑚 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))) = (𝑛 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑚 ∈ (1...𝑛)(((𝐴‘𝑚) · (cos‘(𝑚 · 𝑋))) + ((𝐵‘𝑚) · (sin‘(𝑚 · 𝑋))))))
487	28, 470, 486	3eqtri 2787	. . . . . . . . . 10 ⊢ 𝑍 = (𝑛 ∈ ℕ ↦ (((𝐴‘0) / 2) + Σ𝑚 ∈ (1...𝑛)(((𝐴‘𝑚) · (cos‘(𝑚 · 𝑋))) + ((𝐵‘𝑚) · (sin‘(𝑚 · 𝑋))))))
488		oveq2 7432	. . . . . . . . . . . . 13 ⊢ (𝑦 = 𝑥 → (𝑋 + 𝑦) = (𝑋 + 𝑥))
489	488	fveq2d 6894	. . . . . . . . . . . 12 ⊢ (𝑦 = 𝑥 → (𝐹‘(𝑋 + 𝑦)) = (𝐹‘(𝑋 + 𝑥)))
490		fveq2 6890	. . . . . . . . . . . 12 ⊢ (𝑦 = 𝑥 → ((𝐷‘𝑚)‘𝑦) = ((𝐷‘𝑚)‘𝑥))
491	489, 490	oveq12d 7442	. . . . . . . . . . 11 ⊢ (𝑦 = 𝑥 → ((𝐹‘(𝑋 + 𝑦)) · ((𝐷‘𝑚)‘𝑦)) = ((𝐹‘(𝑋 + 𝑥)) · ((𝐷‘𝑚)‘𝑥)))
492	491	cbvmptv 5208	. . . . . . . . . 10 ⊢ (𝑦 ∈ ℝ ↦ ((𝐹‘(𝑋 + 𝑦)) · ((𝐷‘𝑚)‘𝑦))) = (𝑥 ∈ ℝ ↦ ((𝐹‘(𝑋 + 𝑥)) · ((𝐷‘𝑚)‘𝑥)))
493		eqid 2760	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = ( -π − 𝑋) ∧ (𝑝‘𝑛) = (π − 𝑋)) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))}) = (𝑛 ∈ ℕ ↦ {𝑝 ∈ (ℝ ↑_m (0...𝑛)) ∣ (((𝑝‘0) = ( -π − 𝑋) ∧ (𝑝‘𝑛) = (π − 𝑋)) ∧ ∀𝑖 ∈ (0..^𝑛)(𝑝‘𝑖) < (𝑝‘(𝑖 + 1)))})
494		fveq2 6890	. . . . . . . . . . . 12 ⊢ (𝑗 = 𝑖 → (𝑄‘𝑗) = (𝑄‘𝑖))
495	494	oveq1d 7439	. . . . . . . . . . 11 ⊢ (𝑗 = 𝑖 → ((𝑄‘𝑗) − 𝑋) = ((𝑄‘𝑖) − 𝑋))
496	495	cbvmptv 5208	. . . . . . . . . 10 ⊢ (𝑗 ∈ (0...𝑀) ↦ ((𝑄‘𝑗) − 𝑋)) = (𝑖 ∈ (0...𝑀) ↦ ((𝑄‘𝑖) − 𝑋))
497	451, 459, 487, 288, 51, 52, 53, 146, 43, 92, 492, 103, 222, 233, 48, 493, 496	fourierdlem111 47363	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → (𝑍‘𝑚) = (∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠 + ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠))
498	443, 497	chvarvv 2021	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑍‘𝑛) = (∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠 + ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠))
499	411, 436	oveq12d 7442	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (((𝑚 ∈ ℕ ↦ ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)‘𝑛) + ((𝑚 ∈ ℕ ↦ ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)‘𝑛)) = (∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠 + ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑛)‘𝑠)) d𝑠))
500	498, 499	eqtr4d 2798	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑍‘𝑛) = (((𝑚 ∈ ℕ ↦ ∫( -π(,)0)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)‘𝑛) + ((𝑚 ∈ ℕ ↦ ∫(0(,)π)((𝐹‘(𝑋 + 𝑠)) · ((𝐷‘𝑚)‘𝑠)) d𝑠)‘𝑛)))
501	16, 24, 27, 42, 14, 15, 333, 337, 359, 412, 437, 500	climaddf 46763	. . . . . 6 ⊢ (𝜑 → 𝑍 ⇝ ((𝐿 / 2) + (𝑅 / 2)))
502		limccl 26204	. . . . . . . 8 ⊢ ((𝐹 ↾ (-∞(,)𝑋)) lim_ℂ 𝑋) ⊆ ℂ
503	502, 285	sselid 3907	. . . . . . 7 ⊢ (𝜑 → 𝐿 ∈ ℂ)
504		limccl 26204	. . . . . . . 8 ⊢ ((𝐹 ↾ (𝑋(,)+∞)) lim_ℂ 𝑋) ⊆ ℂ
505	504, 284	sselid 3907	. . . . . . 7 ⊢ (𝜑 → 𝑅 ∈ ℂ)
506		2cnd 12428	. . . . . . 7 ⊢ (𝜑 → 2 ∈ ℂ)
507		2pos 12454	. . . . . . . . 9 ⊢ 0 < 2
508	507	a1i 11	. . . . . . . 8 ⊢ (𝜑 → 0 < 2)
509	508	gt0ne0d 11887	. . . . . . 7 ⊢ (𝜑 → 2 ≠ 0)
510	503, 505, 506, 509	divdird 12138	. . . . . 6 ⊢ (𝜑 → ((𝐿 + 𝑅) / 2) = ((𝐿 / 2) + (𝑅 / 2)))
511	501, 510	breqtrrd 5132	. . . . 5 ⊢ (𝜑 → 𝑍 ⇝ ((𝐿 + 𝑅) / 2))
512		0nn0 12628	. . . . . . . 8 ⊢ 0 ∈ ℕ₀
513	43	adantr 486	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 0 ∈ ℕ₀) → 𝐹:ℝ⟶ℝ)
514		eqid 2760	. . . . . . . . . 10 ⊢ ( -π(,)π) = ( -π(,)π)
515		ioossre 13545	. . . . . . . . . . . . . 14 ⊢ ( -π(,)π) ⊆ ℝ
516	515	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝜑 → ( -π(,)π) ⊆ ℝ)
517	43, 516	feqresmpt 6959	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐹 ↾ ( -π(,)π)) = (𝑥 ∈ ( -π(,)π) ↦ (𝐹‘𝑥)))
518		ioossicc 13571	. . . . . . . . . . . . . 14 ⊢ ( -π(,)π) ⊆ ( -π[,]π)
519	518	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝜑 → ( -π(,)π) ⊆ ( -π[,]π))
520		ioombl 25895	. . . . . . . . . . . . . 14 ⊢ ( -π(,)π) ∈ dom vol
521	520	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝜑 → ( -π(,)π) ∈ dom vol)
522	43	adantr 486	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ ( -π[,]π)) → 𝐹:ℝ⟶ℝ)
523	385	sselda 3909	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ ( -π[,]π)) → 𝑥 ∈ ℝ)
524	522, 523	ffvelcdmd 7090	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ ( -π[,]π)) → (𝐹‘𝑥) ∈ ℝ)
525	43, 385	feqresmpt 6959	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝐹 ↾ ( -π[,]π)) = (𝑥 ∈ ( -π[,]π) ↦ (𝐹‘𝑥)))
526	178	a1i 11	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → ℝ ⊆ ℂ)
527	43, 526	fssd 6732	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝐹:ℝ⟶ℂ)
528	527, 385	fssresd 6754	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝐹 ↾ ( -π[,]π)):( -π[,]π)⟶ℂ)
529		ioossicc 13571	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1))) ⊆ ((𝑄‘𝑖)[,](𝑄‘(𝑖 + 1)))
530	61	rexri 11374	. . . . . . . . . . . . . . . . . . . 20 ⊢ -π ∈ ℝ^*
531	530	a1i 11	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → -π ∈ ℝ^*)
532	54	rexri 11374	. . . . . . . . . . . . . . . . . . . 20 ⊢ π ∈ ℝ^*
533	532	a1i 11	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → π ∈ ℝ^*)
534	51, 52, 53	fourierdlem15 47268	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝜑 → 𝑄:(0...𝑀)⟶( -π[,]π))
535	534	adantr 486	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → 𝑄:(0...𝑀)⟶( -π[,]π))
536		simpr 490	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → 𝑖 ∈ (0..^𝑀))
537	531, 533, 535, 536	fourierdlem8 47261	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → ((𝑄‘𝑖)[,](𝑄‘(𝑖 + 1))) ⊆ ( -π[,]π))
538	529, 537	sstrid 3920	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1))) ⊆ ( -π[,]π))
539	538	resabs1d 6001	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → ((𝐹 ↾ ( -π[,]π)) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) = (𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))))
540	539, 103	eqeltrd 2860	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → ((𝐹 ↾ ( -π[,]π)) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) ∈ (((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))–cn→ℂ))
541	539	eqcomd 2766	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → (𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) = ((𝐹 ↾ ( -π[,]π)) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))))
542	541	oveq1d 7439	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘𝑖)) = (((𝐹 ↾ ( -π[,]π)) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘𝑖)))
543	222, 542	eleqtrd 2862	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → 𝐶 ∈ (((𝐹 ↾ ( -π[,]π)) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘𝑖)))
544	541	oveq1d 7439	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → ((𝐹 ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘(𝑖 + 1))) = (((𝐹 ↾ ( -π[,]π)) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘(𝑖 + 1))))
545	233, 544	eleqtrd 2862	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑖 ∈ (0..^𝑀)) → 𝑈 ∈ (((𝐹 ↾ ( -π[,]π)) ↾ ((𝑄‘𝑖)(,)(𝑄‘(𝑖 + 1)))) lim_ℂ (𝑄‘(𝑖 + 1))))
546	51, 52, 53, 528, 540, 543, 545	fourierdlem69 47321	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝐹 ↾ ( -π[,]π)) ∈ 𝐿¹)
547	525, 546	eqeltrrd 2861	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑥 ∈ ( -π[,]π) ↦ (𝐹‘𝑥)) ∈ 𝐿¹)
548	519, 521, 524, 547	iblss 26134	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑥 ∈ ( -π(,)π) ↦ (𝐹‘𝑥)) ∈ 𝐿¹)
549	517, 548	eqeltrd 2860	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐹 ↾ ( -π(,)π)) ∈ 𝐿¹)
550	549	adantr 486	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 0 ∈ ℕ₀) → (𝐹 ↾ ( -π(,)π)) ∈ 𝐿¹)
551		simpr 490	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 0 ∈ ℕ₀) → 0 ∈ ℕ₀)
552	513, 514, 550, 29, 551	fourierdlem16 47269	. . . . . . . . 9 ⊢ ((𝜑 ∧ 0 ∈ ℕ₀) → (((𝐴‘0) ∈ ℝ ∧ (𝑥 ∈ ( -π(,)π) ↦ (𝐹‘𝑥)) ∈ 𝐿¹) ∧ ∫( -π(,)π)((𝐹‘𝑥) · (cos‘(0 · 𝑥))) d𝑥 ∈ ℝ))
553	552	simplld 780	. . . . . . . 8 ⊢ ((𝜑 ∧ 0 ∈ ℕ₀) → (𝐴‘0) ∈ ℝ)
554	512, 553	mpan2 704	. . . . . . 7 ⊢ (𝜑 → (𝐴‘0) ∈ ℝ)
555	554	rehalfcld 12600	. . . . . 6 ⊢ (𝜑 → ((𝐴‘0) / 2) ∈ ℝ)
556	555	recnd 11344	. . . . 5 ⊢ (𝜑 → ((𝐴‘0) / 2) ∈ ℂ)
557	334	mptex 7233	. . . . . 6 ⊢ (𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))) ∈ V
558	557	a1i 11	. . . . 5 ⊢ (𝜑 → (𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))) ∈ V)
559		simpr 490	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → 𝑚 ∈ ℕ)
560	555	adantr 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → ((𝐴‘0) / 2) ∈ ℝ)
561		fzfid 14123	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → (1...𝑚) ∈ Fin)
562		simpll 779	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑚 ∈ ℕ) ∧ 𝑛 ∈ (1...𝑚)) → 𝜑)
563		elfznn 13694	. . . . . . . . . . . 12 ⊢ (𝑛 ∈ (1...𝑚) → 𝑛 ∈ ℕ)
564	563	adantl 487	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑚 ∈ ℕ) ∧ 𝑛 ∈ (1...𝑚)) → 𝑛 ∈ ℕ)
565		simpl 488	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝜑)
566	362	nnnn0d 12674	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝑛 ∈ ℕ₀)
567		eleq1w 2843	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 = 𝑛 → (𝑘 ∈ ℕ₀ ↔ 𝑛 ∈ ℕ₀))
568	567	anbi2d 642	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 = 𝑛 → ((𝜑 ∧ 𝑘 ∈ ℕ₀) ↔ (𝜑 ∧ 𝑛 ∈ ℕ₀)))
569		fveq2 6890	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 = 𝑛 → (𝐴‘𝑘) = (𝐴‘𝑛))
570	569	eleq1d 2845	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 = 𝑛 → ((𝐴‘𝑘) ∈ ℝ ↔ (𝐴‘𝑛) ∈ ℝ))
571	568, 570	imbi12d 347	. . . . . . . . . . . . . . 15 ⊢ (𝑘 = 𝑛 → (((𝜑 ∧ 𝑘 ∈ ℕ₀) → (𝐴‘𝑘) ∈ ℝ) ↔ ((𝜑 ∧ 𝑛 ∈ ℕ₀) → (𝐴‘𝑛) ∈ ℝ)))
572	43	adantr 486	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ₀) → 𝐹:ℝ⟶ℝ)
573	549	adantr 486	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ₀) → (𝐹 ↾ ( -π(,)π)) ∈ 𝐿¹)
574		simpr 490	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ₀) → 𝑘 ∈ ℕ₀)
575	572, 514, 573, 29, 574	fourierdlem16 47269	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ₀) → (((𝐴‘𝑘) ∈ ℝ ∧ (𝑥 ∈ ( -π(,)π) ↦ (𝐹‘𝑥)) ∈ 𝐿¹) ∧ ∫( -π(,)π)((𝐹‘𝑥) · (cos‘(𝑘 · 𝑥))) d𝑥 ∈ ℝ))
576	575	simplld 780	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ₀) → (𝐴‘𝑘) ∈ ℝ)
577	571, 576	chvarvv 2021	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ₀) → (𝐴‘𝑛) ∈ ℝ)
578	565, 566, 577	syl2anc 596	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐴‘𝑛) ∈ ℝ)
579	362	nnred 12357	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝑛 ∈ ℝ)
580	579, 399	remulcld 11346	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑛 · 𝑋) ∈ ℝ)
581	580	recoscld 16321	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (cos‘(𝑛 · 𝑋)) ∈ ℝ)
582	578, 581	remulcld 11346	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) ∈ ℝ)
583		eleq1w 2843	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 = 𝑛 → (𝑘 ∈ ℕ ↔ 𝑛 ∈ ℕ))
584	583	anbi2d 642	. . . . . . . . . . . . . . 15 ⊢ (𝑘 = 𝑛 → ((𝜑 ∧ 𝑘 ∈ ℕ) ↔ (𝜑 ∧ 𝑛 ∈ ℕ)))
585		fveq2 6890	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 = 𝑛 → (𝐵‘𝑘) = (𝐵‘𝑛))
586	585	eleq1d 2845	. . . . . . . . . . . . . . 15 ⊢ (𝑘 = 𝑛 → ((𝐵‘𝑘) ∈ ℝ ↔ (𝐵‘𝑛) ∈ ℝ))
587	584, 586	imbi12d 347	. . . . . . . . . . . . . 14 ⊢ (𝑘 = 𝑛 → (((𝜑 ∧ 𝑘 ∈ ℕ) → (𝐵‘𝑘) ∈ ℝ) ↔ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐵‘𝑛) ∈ ℝ)))
588	43	adantr 486	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → 𝐹:ℝ⟶ℝ)
589	549	adantr 486	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (𝐹 ↾ ( -π(,)π)) ∈ 𝐿¹)
590		simpr 490	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → 𝑘 ∈ ℕ)
591	588, 514, 589, 452, 590	fourierdlem21 47274	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (((𝐵‘𝑘) ∈ ℝ ∧ (𝑥 ∈ ( -π(,)π) ↦ ((𝐹‘𝑥) · (sin‘(𝑘 · 𝑥)))) ∈ 𝐿¹) ∧ ∫( -π(,)π)((𝐹‘𝑥) · (sin‘(𝑘 · 𝑥))) d𝑥 ∈ ℝ))
592	591	simplld 780	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (𝐵‘𝑘) ∈ ℝ)
593	587, 592	chvarvv 2021	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐵‘𝑛) ∈ ℝ)
594	580	resincld 16320	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (sin‘(𝑛 · 𝑋)) ∈ ℝ)
595	593, 594	remulcld 11346	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))) ∈ ℝ)
596	582, 595	readdcld 11345	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))) ∈ ℝ)
597	562, 564, 596	syl2anc 596	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑚 ∈ ℕ) ∧ 𝑛 ∈ (1...𝑚)) → (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))) ∈ ℝ)
598	561, 597	fsumrecl 15909	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))) ∈ ℝ)
599	560, 598	readdcld 11345	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) ∈ ℝ)
600	28	fvmpt2 7010	. . . . . . . 8 ⊢ ((𝑚 ∈ ℕ ∧ (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) ∈ ℝ) → (𝑍‘𝑚) = (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))))
601	559, 599, 600	syl2anc 596	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → (𝑍‘𝑚) = (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))))
602	601, 599	eqeltrd 2860	. . . . . 6 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → (𝑍‘𝑚) ∈ ℝ)
603	602	recnd 11344	. . . . 5 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → (𝑍‘𝑚) ∈ ℂ)
604		eqidd 2761	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → (𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))) = (𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))))
605		oveq2 7432	. . . . . . . . 9 ⊢ (𝑛 = 𝑚 → (1...𝑛) = (1...𝑚))
606	605	sumeq1d 15876	. . . . . . . 8 ⊢ (𝑛 = 𝑚 → Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
607	606	adantl 487	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑚 ∈ ℕ) ∧ 𝑛 = 𝑚) → Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
608		sumex 15864	. . . . . . . 8 ⊢ Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) ∈ V
609	608	a1i 11	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) ∈ V)
610	604, 607, 559, 609	fvmptd 7006	. . . . . 6 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))‘𝑚) = Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
611	560	recnd 11344	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → ((𝐴‘0) / 2) ∈ ℂ)
612	598	recnd 11344	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))) ∈ ℂ)
613	611, 612	pncan2d 11678	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → ((((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) − ((𝐴‘0) / 2)) = Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))
614	613, 468	eqtr2di 2812	. . . . . 6 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → Σ𝑘 ∈ (1...𝑚)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = ((((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) − ((𝐴‘0) / 2)))
615		ovex 7457	. . . . . . . . 9 ⊢ (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) ∈ V
616	28	fvmpt2 7010	. . . . . . . . 9 ⊢ ((𝑚 ∈ ℕ ∧ (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) ∈ V) → (𝑍‘𝑚) = (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))))
617	559, 615, 616	sylancl 598	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → (𝑍‘𝑚) = (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))))
618	617	eqcomd 2766	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → (((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) = (𝑍‘𝑚))
619	618	oveq1d 7439	. . . . . 6 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → ((((𝐴‘0) / 2) + Σ𝑛 ∈ (1...𝑚)(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) − ((𝐴‘0) / 2)) = ((𝑍‘𝑚) − ((𝐴‘0) / 2)))
620	610, 614, 619	3eqtrd 2799	. . . . 5 ⊢ ((𝜑 ∧ 𝑚 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))‘𝑚) = ((𝑍‘𝑚) − ((𝐴‘0) / 2)))
621	14, 15, 511, 556, 558, 603, 620	climsubc1 15814	. . . 4 ⊢ (𝜑 → (𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))) ⇝ (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2)))
622		seqex 14153	. . . . . 6 ⊢ seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))) ∈ V
623	622	a1i 11	. . . . 5 ⊢ (𝜑 → seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))) ∈ V)
624		eqidd 2761	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑙 ∈ ℕ) → (𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))) = (𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))))
625		oveq2 7432	. . . . . . . . 9 ⊢ (𝑛 = 𝑙 → (1...𝑛) = (1...𝑙))
626	625	sumeq1d 15876	. . . . . . . 8 ⊢ (𝑛 = 𝑙 → Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = Σ𝑘 ∈ (1...𝑙)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
627	626	adantl 487	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑙 ∈ ℕ) ∧ 𝑛 = 𝑙) → Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = Σ𝑘 ∈ (1...𝑙)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
628		simpr 490	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑙 ∈ ℕ) → 𝑙 ∈ ℕ)
629		fzfid 14123	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑙 ∈ ℕ) → (1...𝑙) ∈ Fin)
630		elfznn 13694	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ (1...𝑙) → 𝑘 ∈ ℕ)
631	630	nnnn0d 12674	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ (1...𝑙) → 𝑘 ∈ ℕ₀)
632	631, 576	sylan2 605	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ (1...𝑙)) → (𝐴‘𝑘) ∈ ℝ)
633	630	nnred 12357	. . . . . . . . . . . . . 14 ⊢ (𝑘 ∈ (1...𝑙) → 𝑘 ∈ ℝ)
634	633	adantl 487	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ (1...𝑙)) → 𝑘 ∈ ℝ)
635	146	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ (1...𝑙)) → 𝑋 ∈ ℝ)
636	634, 635	remulcld 11346	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ (1...𝑙)) → (𝑘 · 𝑋) ∈ ℝ)
637	636	recoscld 16321	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ (1...𝑙)) → (cos‘(𝑘 · 𝑋)) ∈ ℝ)
638	632, 637	remulcld 11346	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ (1...𝑙)) → ((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) ∈ ℝ)
639	630, 592	sylan2 605	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ (1...𝑙)) → (𝐵‘𝑘) ∈ ℝ)
640	636	resincld 16320	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ (1...𝑙)) → (sin‘(𝑘 · 𝑋)) ∈ ℝ)
641	639, 640	remulcld 11346	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ (1...𝑙)) → ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))) ∈ ℝ)
642	638, 641	readdcld 11345	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (1...𝑙)) → (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) ∈ ℝ)
643	642	adantlr 728	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑙 ∈ ℕ) ∧ 𝑘 ∈ (1...𝑙)) → (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) ∈ ℝ)
644	629, 643	fsumrecl 15909	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑙 ∈ ℕ) → Σ𝑘 ∈ (1...𝑙)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) ∈ ℝ)
645	624, 627, 628, 644	fvmptd 7006	. . . . . 6 ⊢ ((𝜑 ∧ 𝑙 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))‘𝑙) = Σ𝑘 ∈ (1...𝑙)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
646		eleq1w 2843	. . . . . . . . 9 ⊢ (𝑛 = 𝑙 → (𝑛 ∈ ℕ ↔ 𝑙 ∈ ℕ))
647	646	anbi2d 642	. . . . . . . 8 ⊢ (𝑛 = 𝑙 → ((𝜑 ∧ 𝑛 ∈ ℕ) ↔ (𝜑 ∧ 𝑙 ∈ ℕ)))
648		fveq2 6890	. . . . . . . . 9 ⊢ (𝑛 = 𝑙 → (seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))‘𝑛) = (seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))‘𝑙))
649	626, 648	eqeq12d 2776	. . . . . . . 8 ⊢ (𝑛 = 𝑙 → (Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = (seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))‘𝑛) ↔ Σ𝑘 ∈ (1...𝑙)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = (seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))‘𝑙)))
650	647, 649	imbi12d 347	. . . . . . 7 ⊢ (𝑛 = 𝑙 → (((𝜑 ∧ 𝑛 ∈ ℕ) → Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = (seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))‘𝑛)) ↔ ((𝜑 ∧ 𝑙 ∈ ℕ) → Σ𝑘 ∈ (1...𝑙)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = (seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))‘𝑙))))
651		eqidd 2761	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑘 ∈ (1...𝑛)) → (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))) = (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))
652		fveq2 6890	. . . . . . . . . . . 12 ⊢ (𝑗 = 𝑘 → (𝐴‘𝑗) = (𝐴‘𝑘))
653		oveq1 7431	. . . . . . . . . . . . 13 ⊢ (𝑗 = 𝑘 → (𝑗 · 𝑋) = (𝑘 · 𝑋))
654	653	fveq2d 6894	. . . . . . . . . . . 12 ⊢ (𝑗 = 𝑘 → (cos‘(𝑗 · 𝑋)) = (cos‘(𝑘 · 𝑋)))
655	652, 654	oveq12d 7442	. . . . . . . . . . 11 ⊢ (𝑗 = 𝑘 → ((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) = ((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))))
656		fveq2 6890	. . . . . . . . . . . 12 ⊢ (𝑗 = 𝑘 → (𝐵‘𝑗) = (𝐵‘𝑘))
657	653	fveq2d 6894	. . . . . . . . . . . 12 ⊢ (𝑗 = 𝑘 → (sin‘(𝑗 · 𝑋)) = (sin‘(𝑘 · 𝑋)))
658	656, 657	oveq12d 7442	. . . . . . . . . . 11 ⊢ (𝑗 = 𝑘 → ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))) = ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))
659	655, 658	oveq12d 7442	. . . . . . . . . 10 ⊢ (𝑗 = 𝑘 → (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))) = (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
660	659	adantl 487	. . . . . . . . 9 ⊢ ((((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑘 ∈ (1...𝑛)) ∧ 𝑗 = 𝑘) → (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))) = (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
661		elfznn 13694	. . . . . . . . . 10 ⊢ (𝑘 ∈ (1...𝑛) → 𝑘 ∈ ℕ)
662	661	adantl 487	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑘 ∈ (1...𝑛)) → 𝑘 ∈ ℕ)
663		simpll 779	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑘 ∈ (1...𝑛)) → 𝜑)
664		nnnn0 12620	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ ℕ → 𝑘 ∈ ℕ₀)
665		nn0re 12622	. . . . . . . . . . . . . . . 16 ⊢ (𝑘 ∈ ℕ₀ → 𝑘 ∈ ℝ)
666	665	adantl 487	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ₀) → 𝑘 ∈ ℝ)
667	146	adantr 486	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ₀) → 𝑋 ∈ ℝ)
668	666, 667	remulcld 11346	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ₀) → (𝑘 · 𝑋) ∈ ℝ)
669	668	recoscld 16321	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ₀) → (cos‘(𝑘 · 𝑋)) ∈ ℝ)
670	576, 669	remulcld 11346	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ₀) → ((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) ∈ ℝ)
671	664, 670	sylan2 605	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → ((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) ∈ ℝ)
672	664, 668	sylan2 605	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (𝑘 · 𝑋) ∈ ℝ)
673	672	resincld 16320	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (sin‘(𝑘 · 𝑋)) ∈ ℝ)
674	592, 673	remulcld 11346	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))) ∈ ℝ)
675	671, 674	readdcld 11345	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ) → (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) ∈ ℝ)
676	663, 662, 675	syl2anc 596	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑘 ∈ (1...𝑛)) → (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) ∈ ℝ)
677	651, 660, 662, 676	fvmptd 7006	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑘 ∈ (1...𝑛)) → ((𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))‘𝑘) = (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
678	362, 14	eleqtrdi 2870	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝑛 ∈ (ℤ_≥‘1))
679	676	recnd 11344	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑘 ∈ (1...𝑛)) → (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) ∈ ℂ)
680	677, 678, 679	fsumser 15905	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = (seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))‘𝑛))
681	650, 680	chvarvv 2021	. . . . . 6 ⊢ ((𝜑 ∧ 𝑙 ∈ ℕ) → Σ𝑘 ∈ (1...𝑙)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))) = (seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))‘𝑙))
682	645, 681	eqtrd 2795	. . . . 5 ⊢ ((𝜑 ∧ 𝑙 ∈ ℕ) → ((𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))‘𝑙) = (seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))‘𝑙))
683	14, 558, 623, 15, 682	climeq 15743	. . . 4 ⊢ (𝜑 → ((𝑛 ∈ ℕ ↦ Σ𝑘 ∈ (1...𝑛)(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))) ⇝ (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2)) ↔ seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))) ⇝ (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2))))
684	621, 683	mpbid 235	. . 3 ⊢ (𝜑 → seq1( + , (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))) ⇝ (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2)))
685	13, 684	eqbrtrd 5126	. 2 ⊢ (𝜑 → seq1( + , 𝑆) ⇝ (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2)))
686		eqidd 2761	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))) = (𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))))))
687		fveq2 6890	. . . . . . . . 9 ⊢ (𝑗 = 𝑛 → (𝐴‘𝑗) = (𝐴‘𝑛))
688		oveq1 7431	. . . . . . . . . 10 ⊢ (𝑗 = 𝑛 → (𝑗 · 𝑋) = (𝑛 · 𝑋))
689	688	fveq2d 6894	. . . . . . . . 9 ⊢ (𝑗 = 𝑛 → (cos‘(𝑗 · 𝑋)) = (cos‘(𝑛 · 𝑋)))
690	687, 689	oveq12d 7442	. . . . . . . 8 ⊢ (𝑗 = 𝑛 → ((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) = ((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))))
691		fveq2 6890	. . . . . . . . 9 ⊢ (𝑗 = 𝑛 → (𝐵‘𝑗) = (𝐵‘𝑛))
692	688	fveq2d 6894	. . . . . . . . 9 ⊢ (𝑗 = 𝑛 → (sin‘(𝑗 · 𝑋)) = (sin‘(𝑛 · 𝑋)))
693	691, 692	oveq12d 7442	. . . . . . . 8 ⊢ (𝑗 = 𝑛 → ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋))) = ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))
694	690, 693	oveq12d 7442	. . . . . . 7 ⊢ (𝑗 = 𝑛 → (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))) = (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))
695	694	adantl 487	. . . . . 6 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑗 = 𝑛) → (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))) = (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))
696	686, 695, 362, 596	fvmptd 7006	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ((𝑗 ∈ ℕ ↦ (((𝐴‘𝑗) · (cos‘(𝑗 · 𝑋))) + ((𝐵‘𝑗) · (sin‘(𝑗 · 𝑋)))))‘𝑛) = (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))
697	596	recnd 11344	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))) ∈ ℂ)
698	14, 15, 696, 697, 684	isumclim 15932	. . . 4 ⊢ (𝜑 → Σ𝑛 ∈ ℕ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))) = (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2)))
699	698	oveq2d 7440	. . 3 ⊢ (𝜑 → (((𝐴‘0) / 2) + Σ𝑛 ∈ ℕ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) = (((𝐴‘0) / 2) + (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2))))
700	503, 505	addcld 11335	. . . . 5 ⊢ (𝜑 → (𝐿 + 𝑅) ∈ ℂ)
701	700	halfcld 12598	. . . 4 ⊢ (𝜑 → ((𝐿 + 𝑅) / 2) ∈ ℂ)
702	556, 701	pncan3d 11679	. . 3 ⊢ (𝜑 → (((𝐴‘0) / 2) + (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2))) = ((𝐿 + 𝑅) / 2))
703	699, 702	eqtrd 2795	. 2 ⊢ (𝜑 → (((𝐴‘0) / 2) + Σ𝑛 ∈ ℕ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) = ((𝐿 + 𝑅) / 2))
704	685, 703	jca 521	1 ⊢ (𝜑 → (seq1( + , 𝑆) ⇝ (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2)) ∧ (((𝐴‘0) / 2) + Σ𝑛 ∈ ℕ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) = ((𝐿 + 𝑅) / 2)))

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1569 ∈ wcel 2144 ∀wral 3076 ∃wrex 3086 {crab 3412 Vcvv 3450 ⦋csb 3847 ⊆ wss 3896 ∩ cin 4088 ∪ cun 4148 ifcif 4481 {cpr 4586 class class class wbr 5102 ↦ cmpt 5185 dom cdm 5651 ran crn 5652 ↾ cres 5653 ℩cio 6495 ⟶wf 6539 ‘cfv 6543 Isom wiso 6544 ℩crio 7380 (class class class)co 7424 ↑_m cmap 8855 supcsup 9439 ℂcc 11205 ℝcr 11206 0cc0 11207 1c1 11208 + caddc 11210 · cmul 11212 +∞cpnf 11347 -∞cmnf 11348 ℝ^*cxr 11349 < clt 11350 ≤ cle 11351 − cmin 11548 -cneg 11549 / cdiv 11980 ℕcn 12342 2c2 12404 ℕ₀cn0 12613 ℤcz 12700 ℤ_≥cuz 12972 ℝ⁺crp 13127 (,)cioo 13483 (,]cioc 13484 [,]cicc 13486 ...cfz 13646 ..^cfzo 13795 ⌊cfl 13937 mod cmo 14016 seqcseq 14151 ♯chash 14481 abscabs 15410 ⇝ cli 15660 Σcsu 15862 sincsin 16238 cosccos 16239 πcpi 16241 –cn→ccncf 25206 volcvol 25793 𝐿¹cibl 25947 ∫citg 25948 lim_ℂ climc 26191 D cdv 26192

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5327 ax-pr 5391 ax-un 7755 ax-inf2 9649 ax-cc 10520 ax-cnex 11263 ax-resscn 11264 ax-1cn 11265 ax-icn 11266 ax-addcl 11267 ax-addrcl 11268 ax-mulcl 11269 ax-mulrcl 11270 ax-mulcom 11271 ax-addass 11272 ax-mulass 11273 ax-distr 11274 ax-i2m1 11275 ax-1ne0 11276 ax-1rid 11277 ax-rnegex 11278 ax-rrecex 11279 ax-cnre 11280 ax-pre-lttri 11281 ax-pre-lttrn 11282 ax-pre-ltadd 11283 ax-pre-mulgt0 11284 ax-pre-sup 11285 ax-addf 11286

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-symdif 4197 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-tp 4589 df-op 4835 df-uni 4867 df-int 4907 df-iun 4952 df-iin 4953 df-disj 5070 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-se 5605 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6307 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6497 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-isom 6552 df-riota 7381 df-ov 7427 df-oprab 7428 df-mpo 7429 df-of 7697 df-ofr 7698 df-om 7882 df-1st 8005 df-2nd 8006 df-supp 8185 df-frecs 8307 df-wrecs 8338 df-recs 8387 df-rdg 8426 df-1o 8484 df-2o 8485 df-oadd 8488 df-omul 8489 df-er 8725 df-map 8857 df-pm 8858 df-ixp 8934 df-en 8982 df-dom 8983 df-sdom 8984 df-fin 8985 df-fsupp 9362 df-fi 9410 df-sup 9441 df-inf 9442 df-oi 9511 df-dju 9989 df-card 10027 df-acn 10030 df-pnf 11352 df-mnf 11353 df-xr 11354 df-ltxr 11355 df-le 11356 df-sub 11550 df-neg 11551 df-div 11981 df-nn 12343 df-2 12412 df-3 12413 df-4 12414 df-5 12415 df-6 12416 df-7 12417 df-8 12418 df-9 12419 df-n0 12614 df-xnn0 12687 df-z 12701 df-dec 12822 df-uz 12973 df-q 13083 df-rp 13128 df-xneg 13248 df-xadd 13249 df-xmul 13250 df-ioo 13487 df-ioc 13488 df-ico 13489 df-icc 13490 df-fz 13647 df-fzo 13796 df-fl 13939 df-mod 14017 df-seq 14152 df-exp 14212 df-fac 14425 df-bc 14454 df-hash 14482 df-shft 15229 df-cj 15275 df-re 15276 df-im 15277 df-sqrt 15411 df-abs 15412 df-limsup 15647 df-clim 15664 df-rlim 15665 df-sum 15863 df-ef 16242 df-sin 16244 df-cos 16245 df-pi 16247 df-struct 17334 df-sets 17351 df-slot 17369 df-ndx 17381 df-base 17397 df-ress 17418 df-plusg 17450 df-mulr 17451 df-starv 17452 df-sca 17453 df-vsca 17454 df-ip 17455 df-tset 17456 df-ple 17457 df-ds 17459 df-unif 17460 df-hom 17461 df-cco 17462 df-rest 17602 df-topn 17603 df-0g 17621 df-gsum 17622 df-topgen 17623 df-pt 17624 df-prds 17627 df-xrs 17683 df-qtop 17688 df-imas 17689 df-xps 17691 df-mre 17765 df-mrc 17766 df-acs 17768 df-mgm 18825 df-sgrp 18917 df-mnd 18933 df-submnd 18988 df-mulg 19287 df-cntz 19540 df-cmn 20005 df-psmet 21679 df-xmet 21680 df-met 21681 df-bl 21682 df-mopn 21683 df-fbas 21684 df-fg 21685 df-cnfld 21688 df-top 23221 df-topon 23238 df-topsp 23260 df-bases 23273 df-cld 23346 df-ntr 23347 df-cls 23348 df-nei 23425 df-lp 23463 df-perf 23464 df-cn 23554 df-cnp 23555 df-t1 23641 df-haus 23642 df-cmp 23714 df-tx 23890 df-hmeo 24083 df-fil 24174 df-fm 24266 df-flim 24267 df-flf 24268 df-xms 24648 df-ms 24649 df-tms 24650 df-cncf 25208 df-ovol 25794 df-vol 25795 df-mbf 25949 df-itg1 25950 df-itg2 25951 df-ibl 25952 df-itg 25953 df-0p 26000 df-ditg 26176 df-limc 26195 df-dv 26196

This theorem is used by: fourierdlem113 47365

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