fourierdlem58 - Mathbox for Glauco Siliprandi

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Theorem fourierdlem58 45365

Description: The derivative of 𝐾 is continuous on the given interval. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypotheses**
Ref	Expression
fourierdlem58.k	⊢ 𝐾 = (𝑠 ∈ 𝐴 ↦ (𝑠 / (2 · (sin‘(𝑠 / 2)))))
fourierdlem58.ass	⊢ (𝜑 → 𝐴 ⊆ (-π[,]π))
fourierdlem58.0nA	⊢ (𝜑 → ¬ 0 ∈ 𝐴)
fourierdlem58.4	⊢ (𝜑 → 𝐴 ∈ (topGen‘ran (,)))

**Assertion**
Ref	Expression
fourierdlem58	⊢ (𝜑 → (ℝ D 𝐾) ∈ (𝐴–cn→ℝ))

Distinct variable groups: 𝐴,𝑠 𝜑,𝑠 Allowed substitution hint: 𝐾(𝑠)

**Proof of Theorem fourierdlem58**
Step	Hyp	Ref	Expression
1		pire 26310	. . . . . . . . . 10 ⊢ π ∈ ℝ
2	1	a1i 11	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → π ∈ ℝ)
3	2	renegcld 11638	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → -π ∈ ℝ)
4	3, 2	iccssred 13408	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (-π[,]π) ⊆ ℝ)
5		fourierdlem58.ass	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ⊆ (-π[,]π))
6	5	sselda 3974	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → 𝑠 ∈ (-π[,]π))
7	4, 6	sseldd 3975	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → 𝑠 ∈ ℝ)
8		2re 12283	. . . . . . . 8 ⊢ 2 ∈ ℝ
9	8	a1i 11	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → 2 ∈ ℝ)
10	7	rehalfcld 12456	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (𝑠 / 2) ∈ ℝ)
11	10	resincld 16083	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (sin‘(𝑠 / 2)) ∈ ℝ)
12	9, 11	remulcld 11241	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (2 · (sin‘(𝑠 / 2))) ∈ ℝ)
13		2cnd 12287	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → 2 ∈ ℂ)
14	7	recnd 11239	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → 𝑠 ∈ ℂ)
15	14	halfcld 12454	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (𝑠 / 2) ∈ ℂ)
16	15	sincld 16070	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (sin‘(𝑠 / 2)) ∈ ℂ)
17		2ne0 12313	. . . . . . . 8 ⊢ 2 ≠ 0
18	17	a1i 11	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → 2 ≠ 0)
19		eqcom 2731	. . . . . . . . . . . . . 14 ⊢ (𝑠 = 0 ↔ 0 = 𝑠)
20	19	biimpi 215	. . . . . . . . . . . . 13 ⊢ (𝑠 = 0 → 0 = 𝑠)
21	20	adantl 481	. . . . . . . . . . . 12 ⊢ ((𝑠 ∈ 𝐴 ∧ 𝑠 = 0) → 0 = 𝑠)
22		simpl 482	. . . . . . . . . . . 12 ⊢ ((𝑠 ∈ 𝐴 ∧ 𝑠 = 0) → 𝑠 ∈ 𝐴)
23	21, 22	eqeltrd 2825	. . . . . . . . . . 11 ⊢ ((𝑠 ∈ 𝐴 ∧ 𝑠 = 0) → 0 ∈ 𝐴)
24	23	adantll 711	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑠 ∈ 𝐴) ∧ 𝑠 = 0) → 0 ∈ 𝐴)
25		fourierdlem58.0nA	. . . . . . . . . . 11 ⊢ (𝜑 → ¬ 0 ∈ 𝐴)
26	25	ad2antrr 723	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑠 ∈ 𝐴) ∧ 𝑠 = 0) → ¬ 0 ∈ 𝐴)
27	24, 26	pm2.65da 814	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → ¬ 𝑠 = 0)
28	27	neqned 2939	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → 𝑠 ≠ 0)
29		fourierdlem44 45352	. . . . . . . 8 ⊢ ((𝑠 ∈ (-π[,]π) ∧ 𝑠 ≠ 0) → (sin‘(𝑠 / 2)) ≠ 0)
30	6, 28, 29	syl2anc 583	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (sin‘(𝑠 / 2)) ≠ 0)
31	13, 16, 18, 30	mulne0d 11863	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (2 · (sin‘(𝑠 / 2))) ≠ 0)
32	7, 12, 31	redivcld 12039	. . . . 5 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (𝑠 / (2 · (sin‘(𝑠 / 2)))) ∈ ℝ)
33		fourierdlem58.k	. . . . 5 ⊢ 𝐾 = (𝑠 ∈ 𝐴 ↦ (𝑠 / (2 · (sin‘(𝑠 / 2)))))
34	32, 33	fmptd 7105	. . . 4 ⊢ (𝜑 → 𝐾:𝐴⟶ℝ)
35	1	a1i 11	. . . . . . 7 ⊢ (𝜑 → π ∈ ℝ)
36	35	renegcld 11638	. . . . . 6 ⊢ (𝜑 → -π ∈ ℝ)
37	36, 35	iccssred 13408	. . . . 5 ⊢ (𝜑 → (-π[,]π) ⊆ ℝ)
38	5, 37	sstrd 3984	. . . 4 ⊢ (𝜑 → 𝐴 ⊆ ℝ)
39		dvfre 25805	. . . 4 ⊢ ((𝐾:𝐴⟶ℝ ∧ 𝐴 ⊆ ℝ) → (ℝ D 𝐾):dom (ℝ D 𝐾)⟶ℝ)
40	34, 38, 39	syl2anc 583	. . 3 ⊢ (𝜑 → (ℝ D 𝐾):dom (ℝ D 𝐾)⟶ℝ)
41		fourierdlem58.4	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ∈ (topGen‘ran (,)))
42		eqidd 2725	. . . . . . . . 9 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ 𝑠) = (𝑠 ∈ 𝐴 ↦ 𝑠))
43		eqidd 2725	. . . . . . . . 9 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))) = (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))))
44	41, 7, 12, 42, 43	offval2 7683	. . . . . . . 8 ⊢ (𝜑 → ((𝑠 ∈ 𝐴 ↦ 𝑠) ∘_f / (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))) = (𝑠 ∈ 𝐴 ↦ (𝑠 / (2 · (sin‘(𝑠 / 2))))))
45	33, 44	eqtr4id 2783	. . . . . . 7 ⊢ (𝜑 → 𝐾 = ((𝑠 ∈ 𝐴 ↦ 𝑠) ∘_f / (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))))
46	45	oveq2d 7417	. . . . . 6 ⊢ (𝜑 → (ℝ D 𝐾) = (ℝ D ((𝑠 ∈ 𝐴 ↦ 𝑠) ∘_f / (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))))))
47		reelprrecn 11198	. . . . . . . 8 ⊢ ℝ ∈ {ℝ, ℂ}
48	47	a1i 11	. . . . . . 7 ⊢ (𝜑 → ℝ ∈ {ℝ, ℂ})
49		eqid 2724	. . . . . . . 8 ⊢ (𝑠 ∈ 𝐴 ↦ 𝑠) = (𝑠 ∈ 𝐴 ↦ 𝑠)
50	14, 49	fmptd 7105	. . . . . . 7 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ 𝑠):𝐴⟶ℂ)
51	13, 16	mulcld 11231	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (2 · (sin‘(𝑠 / 2))) ∈ ℂ)
52	31	neneqd 2937	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → ¬ (2 · (sin‘(𝑠 / 2))) = 0)
53		elsng 4634	. . . . . . . . . . 11 ⊢ ((2 · (sin‘(𝑠 / 2))) ∈ ℝ → ((2 · (sin‘(𝑠 / 2))) ∈ {0} ↔ (2 · (sin‘(𝑠 / 2))) = 0))
54	12, 53	syl 17	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → ((2 · (sin‘(𝑠 / 2))) ∈ {0} ↔ (2 · (sin‘(𝑠 / 2))) = 0))
55	52, 54	mtbird 325	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → ¬ (2 · (sin‘(𝑠 / 2))) ∈ {0})
56	51, 55	eldifd 3951	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (2 · (sin‘(𝑠 / 2))) ∈ (ℂ ∖ {0}))
57		eqid 2724	. . . . . . . 8 ⊢ (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))) = (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))
58	56, 57	fmptd 7105	. . . . . . 7 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))):𝐴⟶(ℂ ∖ {0}))
59		eqid 2724	. . . . . . . . . . 11 ⊢ (TopOpen‘ℂ_fld) = (TopOpen‘ℂ_fld)
60	59	tgioo2 24641	. . . . . . . . . 10 ⊢ (topGen‘ran (,)) = ((TopOpen‘ℂ_fld) ↾_t ℝ)
61	41, 60	eleqtrdi 2835	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ∈ ((TopOpen‘ℂ_fld) ↾_t ℝ))
62	48, 61	dvmptidg 45118	. . . . . . . 8 ⊢ (𝜑 → (ℝ D (𝑠 ∈ 𝐴 ↦ 𝑠)) = (𝑠 ∈ 𝐴 ↦ 1))
63		ax-resscn 11163	. . . . . . . . . . 11 ⊢ ℝ ⊆ ℂ
64	63	a1i 11	. . . . . . . . . 10 ⊢ (𝜑 → ℝ ⊆ ℂ)
65	38, 64	sstrd 3984	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ⊆ ℂ)
66		1cnd 11206	. . . . . . . . 9 ⊢ (𝜑 → 1 ∈ ℂ)
67		ssid 3996	. . . . . . . . . 10 ⊢ ℂ ⊆ ℂ
68	67	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → ℂ ⊆ ℂ)
69	65, 66, 68	constcncfg 45073	. . . . . . . 8 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ 1) ∈ (𝐴–cn→ℂ))
70	62, 69	eqeltrd 2825	. . . . . . 7 ⊢ (𝜑 → (ℝ D (𝑠 ∈ 𝐴 ↦ 𝑠)) ∈ (𝐴–cn→ℂ))
71	38	resmptd 6030	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) ↾ 𝐴) = (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))))
72	71	eqcomd 2730	. . . . . . . . . 10 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))) = ((𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) ↾ 𝐴))
73	72	oveq2d 7417	. . . . . . . . 9 ⊢ (𝜑 → (ℝ D (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))) = (ℝ D ((𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) ↾ 𝐴)))
74		eqid 2724	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) = (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))
75		2cnd 12287	. . . . . . . . . . . . 13 ⊢ (𝑠 ∈ ℝ → 2 ∈ ℂ)
76		recn 11196	. . . . . . . . . . . . . . 15 ⊢ (𝑠 ∈ ℝ → 𝑠 ∈ ℂ)
77	76	halfcld 12454	. . . . . . . . . . . . . 14 ⊢ (𝑠 ∈ ℝ → (𝑠 / 2) ∈ ℂ)
78	77	sincld 16070	. . . . . . . . . . . . 13 ⊢ (𝑠 ∈ ℝ → (sin‘(𝑠 / 2)) ∈ ℂ)
79	75, 78	mulcld 11231	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ ℝ → (2 · (sin‘(𝑠 / 2))) ∈ ℂ)
80	74, 79	fmpti 7103	. . . . . . . . . . 11 ⊢ (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))):ℝ⟶ℂ
81	80	a1i 11	. . . . . . . . . 10 ⊢ (𝜑 → (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))):ℝ⟶ℂ)
82		ssid 3996	. . . . . . . . . . 11 ⊢ ℝ ⊆ ℝ
83	82	a1i 11	. . . . . . . . . 10 ⊢ (𝜑 → ℝ ⊆ ℝ)
84	59, 60	dvres 25762	. . . . . . . . . 10 ⊢ (((ℝ ⊆ ℂ ∧ (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))):ℝ⟶ℂ) ∧ (ℝ ⊆ ℝ ∧ 𝐴 ⊆ ℝ)) → (ℝ D ((𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) ↾ 𝐴)) = ((ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) ↾ ((int‘(topGen‘ran (,)))‘𝐴)))
85	64, 81, 83, 38, 84	syl22anc 836	. . . . . . . . 9 ⊢ (𝜑 → (ℝ D ((𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) ↾ 𝐴)) = ((ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) ↾ ((int‘(topGen‘ran (,)))‘𝐴)))
86		retop 24600	. . . . . . . . . . . . . 14 ⊢ (topGen‘ran (,)) ∈ Top
87	86	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝜑 → (topGen‘ran (,)) ∈ Top)
88		uniretop 24601	. . . . . . . . . . . . . 14 ⊢ ℝ = ∪ (topGen‘ran (,))
89	88	isopn3 22892	. . . . . . . . . . . . 13 ⊢ (((topGen‘ran (,)) ∈ Top ∧ 𝐴 ⊆ ℝ) → (𝐴 ∈ (topGen‘ran (,)) ↔ ((int‘(topGen‘ran (,)))‘𝐴) = 𝐴))
90	87, 38, 89	syl2anc 583	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 ∈ (topGen‘ran (,)) ↔ ((int‘(topGen‘ran (,)))‘𝐴) = 𝐴))
91	41, 90	mpbid 231	. . . . . . . . . . 11 ⊢ (𝜑 → ((int‘(topGen‘ran (,)))‘𝐴) = 𝐴)
92	91	reseq2d 5971	. . . . . . . . . 10 ⊢ (𝜑 → ((ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) ↾ ((int‘(topGen‘ran (,)))‘𝐴)) = ((ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) ↾ 𝐴))
93		resmpt 6027	. . . . . . . . . . . . . . . 16 ⊢ (ℝ ⊆ ℂ → ((𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) ↾ ℝ) = (𝑠 ∈ ℝ ↦ (2 · (sin‘((1 / 2) · 𝑠)))))
94	63, 93	ax-mp 5	. . . . . . . . . . . . . . 15 ⊢ ((𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) ↾ ℝ) = (𝑠 ∈ ℝ ↦ (2 · (sin‘((1 / 2) · 𝑠))))
95		id 22	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑠 ∈ ℂ → 𝑠 ∈ ℂ)
96		2cnd 12287	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑠 ∈ ℂ → 2 ∈ ℂ)
97	17	a1i 11	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑠 ∈ ℂ → 2 ≠ 0)
98	95, 96, 97	divrec2d 11991	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑠 ∈ ℂ → (𝑠 / 2) = ((1 / 2) · 𝑠))
99	98	eqcomd 2730	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑠 ∈ ℂ → ((1 / 2) · 𝑠) = (𝑠 / 2))
100	76, 99	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑠 ∈ ℝ → ((1 / 2) · 𝑠) = (𝑠 / 2))
101	100	fveq2d 6885	. . . . . . . . . . . . . . . . 17 ⊢ (𝑠 ∈ ℝ → (sin‘((1 / 2) · 𝑠)) = (sin‘(𝑠 / 2)))
102	101	oveq2d 7417	. . . . . . . . . . . . . . . 16 ⊢ (𝑠 ∈ ℝ → (2 · (sin‘((1 / 2) · 𝑠))) = (2 · (sin‘(𝑠 / 2))))
103	102	mpteq2ia 5241	. . . . . . . . . . . . . . 15 ⊢ (𝑠 ∈ ℝ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) = (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))
104	94, 103	eqtr2i 2753	. . . . . . . . . . . . . 14 ⊢ (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) = ((𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) ↾ ℝ)
105	104	oveq2i 7412	. . . . . . . . . . . . 13 ⊢ (ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) = (ℝ D ((𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) ↾ ℝ))
106		eqid 2724	. . . . . . . . . . . . . . 15 ⊢ (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) = (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))
107		halfcn 12424	. . . . . . . . . . . . . . . . . . 19 ⊢ (1 / 2) ∈ ℂ
108	107	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑠 ∈ ℂ → (1 / 2) ∈ ℂ)
109	108, 95	mulcld 11231	. . . . . . . . . . . . . . . . 17 ⊢ (𝑠 ∈ ℂ → ((1 / 2) · 𝑠) ∈ ℂ)
110	109	sincld 16070	. . . . . . . . . . . . . . . 16 ⊢ (𝑠 ∈ ℂ → (sin‘((1 / 2) · 𝑠)) ∈ ℂ)
111	96, 110	mulcld 11231	. . . . . . . . . . . . . . 15 ⊢ (𝑠 ∈ ℂ → (2 · (sin‘((1 / 2) · 𝑠))) ∈ ℂ)
112	106, 111	fmpti 7103	. . . . . . . . . . . . . 14 ⊢ (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))):ℂ⟶ℂ
113		2cn 12284	. . . . . . . . . . . . . . . . . . 19 ⊢ 2 ∈ ℂ
114		dvasinbx 45121	. . . . . . . . . . . . . . . . . . 19 ⊢ ((2 ∈ ℂ ∧ (1 / 2) ∈ ℂ) → (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) = (𝑠 ∈ ℂ ↦ ((2 · (1 / 2)) · (cos‘((1 / 2) · 𝑠)))))
115	113, 107, 114	mp2an 689	. . . . . . . . . . . . . . . . . 18 ⊢ (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) = (𝑠 ∈ ℂ ↦ ((2 · (1 / 2)) · (cos‘((1 / 2) · 𝑠))))
116	113, 17	recidi 11942	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (2 · (1 / 2)) = 1
117	116	a1i 11	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑠 ∈ ℂ → (2 · (1 / 2)) = 1)
118	99	fveq2d 6885	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑠 ∈ ℂ → (cos‘((1 / 2) · 𝑠)) = (cos‘(𝑠 / 2)))
119	117, 118	oveq12d 7419	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑠 ∈ ℂ → ((2 · (1 / 2)) · (cos‘((1 / 2) · 𝑠))) = (1 · (cos‘(𝑠 / 2))))
120		halfcl 12434	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑠 ∈ ℂ → (𝑠 / 2) ∈ ℂ)
121	120	coscld 16071	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑠 ∈ ℂ → (cos‘(𝑠 / 2)) ∈ ℂ)
122	121	mullidd 11229	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑠 ∈ ℂ → (1 · (cos‘(𝑠 / 2))) = (cos‘(𝑠 / 2)))
123	119, 122	eqtrd 2764	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑠 ∈ ℂ → ((2 · (1 / 2)) · (cos‘((1 / 2) · 𝑠))) = (cos‘(𝑠 / 2)))
124	123	mpteq2ia 5241	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑠 ∈ ℂ ↦ ((2 · (1 / 2)) · (cos‘((1 / 2) · 𝑠)))) = (𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2)))
125	115, 124	eqtri 2752	. . . . . . . . . . . . . . . . 17 ⊢ (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) = (𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2)))
126	125	dmeqi 5894	. . . . . . . . . . . . . . . 16 ⊢ dom (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) = dom (𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2)))
127		dmmptg 6231	. . . . . . . . . . . . . . . . 17 ⊢ (∀𝑠 ∈ ℂ (cos‘(𝑠 / 2)) ∈ ℂ → dom (𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) = ℂ)
128	127, 121	mprg 3059	. . . . . . . . . . . . . . . 16 ⊢ dom (𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) = ℂ
129	126, 128	eqtri 2752	. . . . . . . . . . . . . . 15 ⊢ dom (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) = ℂ
130	63, 129	sseqtrri 4011	. . . . . . . . . . . . . 14 ⊢ ℝ ⊆ dom (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))))
131		dvres3 25764	. . . . . . . . . . . . . 14 ⊢ (((ℝ ∈ {ℝ, ℂ} ∧ (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))):ℂ⟶ℂ) ∧ (ℂ ⊆ ℂ ∧ ℝ ⊆ dom (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))))) → (ℝ D ((𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) ↾ ℝ)) = ((ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) ↾ ℝ))
132	47, 112, 67, 130, 131	mp4an 690	. . . . . . . . . . . . 13 ⊢ (ℝ D ((𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) ↾ ℝ)) = ((ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) ↾ ℝ)
133	125	reseq1i 5967	. . . . . . . . . . . . 13 ⊢ ((ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) ↾ ℝ) = ((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ ℝ)
134	105, 132, 133	3eqtri 2756	. . . . . . . . . . . 12 ⊢ (ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) = ((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ ℝ)
135	134	reseq1i 5967	. . . . . . . . . . 11 ⊢ ((ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) ↾ 𝐴) = (((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ ℝ) ↾ 𝐴)
136	135	a1i 11	. . . . . . . . . 10 ⊢ (𝜑 → ((ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) ↾ 𝐴) = (((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ ℝ) ↾ 𝐴))
137	38	resabs1d 6002	. . . . . . . . . . 11 ⊢ (𝜑 → (((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ ℝ) ↾ 𝐴) = ((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ 𝐴))
138	65	resmptd 6030	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ 𝐴) = (𝑠 ∈ 𝐴 ↦ (cos‘(𝑠 / 2))))
139	137, 138	eqtrd 2764	. . . . . . . . . 10 ⊢ (𝜑 → (((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ ℝ) ↾ 𝐴) = (𝑠 ∈ 𝐴 ↦ (cos‘(𝑠 / 2))))
140	92, 136, 139	3eqtrd 2768	. . . . . . . . 9 ⊢ (𝜑 → ((ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) ↾ ((int‘(topGen‘ran (,)))‘𝐴)) = (𝑠 ∈ 𝐴 ↦ (cos‘(𝑠 / 2))))
141	73, 85, 140	3eqtrd 2768	. . . . . . . 8 ⊢ (𝜑 → (ℝ D (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))) = (𝑠 ∈ 𝐴 ↦ (cos‘(𝑠 / 2))))
142		coscn 26299	. . . . . . . . . 10 ⊢ cos ∈ (ℂ–cn→ℂ)
143	142	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → cos ∈ (ℂ–cn→ℂ))
144	65, 68	idcncfg 45074	. . . . . . . . . 10 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ 𝑠) ∈ (𝐴–cn→ℂ))
145		2cnd 12287	. . . . . . . . . . . 12 ⊢ (𝜑 → 2 ∈ ℂ)
146	17	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → 2 ≠ 0)
147		eldifsn 4782	. . . . . . . . . . . 12 ⊢ (2 ∈ (ℂ ∖ {0}) ↔ (2 ∈ ℂ ∧ 2 ≠ 0))
148	145, 146, 147	sylanbrc 582	. . . . . . . . . . 11 ⊢ (𝜑 → 2 ∈ (ℂ ∖ {0}))
149		difssd 4124	. . . . . . . . . . 11 ⊢ (𝜑 → (ℂ ∖ {0}) ⊆ ℂ)
150	65, 148, 149	constcncfg 45073	. . . . . . . . . 10 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ 2) ∈ (𝐴–cn→(ℂ ∖ {0})))
151	144, 150	divcncf 25298	. . . . . . . . 9 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ (𝑠 / 2)) ∈ (𝐴–cn→ℂ))
152	143, 151	cncfmpt1f 24756	. . . . . . . 8 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ (cos‘(𝑠 / 2))) ∈ (𝐴–cn→ℂ))
153	141, 152	eqeltrd 2825	. . . . . . 7 ⊢ (𝜑 → (ℝ D (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))) ∈ (𝐴–cn→ℂ))
154	48, 50, 58, 70, 153	dvdivcncf 45128	. . . . . 6 ⊢ (𝜑 → (ℝ D ((𝑠 ∈ 𝐴 ↦ 𝑠) ∘_f / (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))))) ∈ (𝐴–cn→ℂ))
155	46, 154	eqeltrd 2825	. . . . 5 ⊢ (𝜑 → (ℝ D 𝐾) ∈ (𝐴–cn→ℂ))
156		cncff 24735	. . . . 5 ⊢ ((ℝ D 𝐾) ∈ (𝐴–cn→ℂ) → (ℝ D 𝐾):𝐴⟶ℂ)
157		fdm 6716	. . . . 5 ⊢ ((ℝ D 𝐾):𝐴⟶ℂ → dom (ℝ D 𝐾) = 𝐴)
158	155, 156, 157	3syl 18	. . . 4 ⊢ (𝜑 → dom (ℝ D 𝐾) = 𝐴)
159	158	feq2d 6693	. . 3 ⊢ (𝜑 → ((ℝ D 𝐾):dom (ℝ D 𝐾)⟶ℝ ↔ (ℝ D 𝐾):𝐴⟶ℝ))
160	40, 159	mpbid 231	. 2 ⊢ (𝜑 → (ℝ D 𝐾):𝐴⟶ℝ)
161		cncfcdm 24740	. . 3 ⊢ ((ℝ ⊆ ℂ ∧ (ℝ D 𝐾) ∈ (𝐴–cn→ℂ)) → ((ℝ D 𝐾) ∈ (𝐴–cn→ℝ) ↔ (ℝ D 𝐾):𝐴⟶ℝ))
162	64, 155, 161	syl2anc 583	. 2 ⊢ (𝜑 → ((ℝ D 𝐾) ∈ (𝐴–cn→ℝ) ↔ (ℝ D 𝐾):𝐴⟶ℝ))
163	160, 162	mpbird 257	1 ⊢ (𝜑 → (ℝ D 𝐾) ∈ (𝐴–cn→ℝ))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1533 ∈ wcel 2098 ≠ wne 2932 ∖ cdif 3937 ⊆ wss 3940 {csn 4620 {cpr 4622 ↦ cmpt 5221 dom cdm 5666 ran crn 5667 ↾ cres 5668 ⟶wf 6529 ‘cfv 6533 (class class class)co 7401 ∘_f cof 7661 ℂcc 11104 ℝcr 11105 0cc0 11106 1c1 11107 · cmul 11111 -cneg 11442 / cdiv 11868 2c2 12264 (,)cioo 13321 [,]cicc 13324 sincsin 16004 cosccos 16005 πcpi 16007 ↾_t crest 17365 TopOpenctopn 17366 topGenctg 17382 ℂ_fldccnfld 21228 Topctop 22717 intcnt 22843 –cn→ccncf 24718 D cdv 25714

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2695 ax-rep 5275 ax-sep 5289 ax-nul 5296 ax-pow 5353 ax-pr 5417 ax-un 7718 ax-inf2 9632 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184 ax-addf 11185

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2526 df-eu 2555 df-clab 2702 df-cleq 2716 df-clel 2802 df-nfc 2877 df-ne 2933 df-nel 3039 df-ral 3054 df-rex 3063 df-rmo 3368 df-reu 3369 df-rab 3425 df-v 3468 df-sbc 3770 df-csb 3886 df-dif 3943 df-un 3945 df-in 3947 df-ss 3957 df-pss 3959 df-nul 4315 df-if 4521 df-pw 4596 df-sn 4621 df-pr 4623 df-tp 4625 df-op 4627 df-uni 4900 df-int 4941 df-iun 4989 df-iin 4990 df-br 5139 df-opab 5201 df-mpt 5222 df-tr 5256 df-id 5564 df-eprel 5570 df-po 5578 df-so 5579 df-fr 5621 df-se 5622 df-we 5623 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-pred 6290 df-ord 6357 df-on 6358 df-lim 6359 df-suc 6360 df-iota 6485 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-isom 6542 df-riota 7357 df-ov 7404 df-oprab 7405 df-mpo 7406 df-of 7663 df-om 7849 df-1st 7968 df-2nd 7969 df-supp 8141 df-frecs 8261 df-wrecs 8292 df-recs 8366 df-rdg 8405 df-1o 8461 df-2o 8462 df-er 8699 df-map 8818 df-pm 8819 df-ixp 8888 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-fsupp 9358 df-fi 9402 df-sup 9433 df-inf 9434 df-oi 9501 df-card 9930 df-pnf 11247 df-mnf 11248 df-xr 11249 df-ltxr 11250 df-le 11251 df-sub 11443 df-neg 11444 df-div 11869 df-nn 12210 df-2 12272 df-3 12273 df-4 12274 df-5 12275 df-6 12276 df-7 12277 df-8 12278 df-9 12279 df-n0 12470 df-z 12556 df-dec 12675 df-uz 12820 df-q 12930 df-rp 12972 df-xneg 13089 df-xadd 13090 df-xmul 13091 df-ioo 13325 df-ioc 13326 df-ico 13327 df-icc 13328 df-fz 13482 df-fzo 13625 df-fl 13754 df-mod 13832 df-seq 13964 df-exp 14025 df-fac 14231 df-bc 14260 df-hash 14288 df-shft 15011 df-cj 15043 df-re 15044 df-im 15045 df-sqrt 15179 df-abs 15180 df-limsup 15412 df-clim 15429 df-rlim 15430 df-sum 15630 df-ef 16008 df-sin 16010 df-cos 16011 df-pi 16013 df-struct 17079 df-sets 17096 df-slot 17114 df-ndx 17126 df-base 17144 df-ress 17173 df-plusg 17209 df-mulr 17210 df-starv 17211 df-sca 17212 df-vsca 17213 df-ip 17214 df-tset 17215 df-ple 17216 df-ds 17218 df-unif 17219 df-hom 17220 df-cco 17221 df-rest 17367 df-topn 17368 df-0g 17386 df-gsum 17387 df-topgen 17388 df-pt 17389 df-prds 17392 df-xrs 17447 df-qtop 17452 df-imas 17453 df-xps 17455 df-mre 17529 df-mrc 17530 df-acs 17532 df-mgm 18563 df-sgrp 18642 df-mnd 18658 df-submnd 18704 df-mulg 18986 df-cntz 19223 df-cmn 19692 df-psmet 21220 df-xmet 21221 df-met 21222 df-bl 21223 df-mopn 21224 df-fbas 21225 df-fg 21226 df-cnfld 21229 df-top 22718 df-topon 22735 df-topsp 22757 df-bases 22771 df-cld 22845 df-ntr 22846 df-cls 22847 df-nei 22924 df-lp 22962 df-perf 22963 df-cn 23053 df-cnp 23054 df-t1 23140 df-haus 23141 df-tx 23388 df-hmeo 23581 df-fil 23672 df-fm 23764 df-flim 23765 df-flf 23766 df-xms 24148 df-ms 24149 df-tms 24150 df-cncf 24720 df-limc 25717 df-dv 25718

This theorem is referenced by: fourierdlem72 45379

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