fourierdlem58 - Mathbox for Glauco Siliprandi

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Theorem fourierdlem58 44867

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 25960	. . . . . . . . . 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 3982	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → 𝑠 ∈ (-π[,]π))
7	4, 6	sseldd 3983	. . . . . 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 2740	. . . . . . . . . . . . . 14 ⊢ (𝑠 = 0 ↔ 0 = 𝑠)
20	19	biimpi 215	. . . . . . . . . . . . 13 ⊢ (𝑠 = 0 → 0 = 𝑠)
21	20	adantl 483	. . . . . . . . . . . 12 ⊢ ((𝑠 ∈ 𝐴 ∧ 𝑠 = 0) → 0 = 𝑠)
22		simpl 484	. . . . . . . . . . . 12 ⊢ ((𝑠 ∈ 𝐴 ∧ 𝑠 = 0) → 𝑠 ∈ 𝐴)
23	21, 22	eqeltrd 2834	. . . . . . . . . . 11 ⊢ ((𝑠 ∈ 𝐴 ∧ 𝑠 = 0) → 0 ∈ 𝐴)
24	23	adantll 713	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑠 ∈ 𝐴) ∧ 𝑠 = 0) → 0 ∈ 𝐴)
25		fourierdlem58.0nA	. . . . . . . . . . 11 ⊢ (𝜑 → ¬ 0 ∈ 𝐴)
26	25	ad2antrr 725	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑠 ∈ 𝐴) ∧ 𝑠 = 0) → ¬ 0 ∈ 𝐴)
27	24, 26	pm2.65da 816	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → ¬ 𝑠 = 0)
28	27	neqned 2948	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → 𝑠 ≠ 0)
29		fourierdlem44 44854	. . . . . . . 8 ⊢ ((𝑠 ∈ (-π[,]π) ∧ 𝑠 ≠ 0) → (sin‘(𝑠 / 2)) ≠ 0)
30	6, 28, 29	syl2anc 585	. . . . . . 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 7111	. . . 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 3992	. . . 4 ⊢ (𝜑 → 𝐴 ⊆ ℝ)
39		dvfre 25460	. . . 4 ⊢ ((𝐾:𝐴⟶ℝ ∧ 𝐴 ⊆ ℝ) → (ℝ D 𝐾):dom (ℝ D 𝐾)⟶ℝ)
40	34, 38, 39	syl2anc 585	. . 3 ⊢ (𝜑 → (ℝ D 𝐾):dom (ℝ D 𝐾)⟶ℝ)
41		fourierdlem58.4	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ∈ (topGen‘ran (,)))
42		eqidd 2734	. . . . . . . . 9 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ 𝑠) = (𝑠 ∈ 𝐴 ↦ 𝑠))
43		eqidd 2734	. . . . . . . . 9 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))) = (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))))
44	41, 7, 12, 42, 43	offval2 7687	. . . . . . . 8 ⊢ (𝜑 → ((𝑠 ∈ 𝐴 ↦ 𝑠) ∘_f / (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))) = (𝑠 ∈ 𝐴 ↦ (𝑠 / (2 · (sin‘(𝑠 / 2))))))
45	33, 44	eqtr4id 2792	. . . . . . 7 ⊢ (𝜑 → 𝐾 = ((𝑠 ∈ 𝐴 ↦ 𝑠) ∘_f / (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))))
46	45	oveq2d 7422	. . . . . 6 ⊢ (𝜑 → (ℝ D 𝐾) = (ℝ D ((𝑠 ∈ 𝐴 ↦ 𝑠) ∘_f / (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))))))
47		reelprrecn 11199	. . . . . . . 8 ⊢ ℝ ∈ {ℝ, ℂ}
48	47	a1i 11	. . . . . . 7 ⊢ (𝜑 → ℝ ∈ {ℝ, ℂ})
49		eqid 2733	. . . . . . . 8 ⊢ (𝑠 ∈ 𝐴 ↦ 𝑠) = (𝑠 ∈ 𝐴 ↦ 𝑠)
50	14, 49	fmptd 7111	. . . . . . 7 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ 𝑠):𝐴⟶ℂ)
51	13, 16	mulcld 11231	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (2 · (sin‘(𝑠 / 2))) ∈ ℂ)
52	31	neneqd 2946	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → ¬ (2 · (sin‘(𝑠 / 2))) = 0)
53		elsng 4642	. . . . . . . . . . 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 3959	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝐴) → (2 · (sin‘(𝑠 / 2))) ∈ (ℂ ∖ {0}))
57		eqid 2733	. . . . . . . 8 ⊢ (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))) = (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))
58	56, 57	fmptd 7111	. . . . . . 7 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))):𝐴⟶(ℂ ∖ {0}))
59		eqid 2733	. . . . . . . . . . 11 ⊢ (TopOpen‘ℂ_fld) = (TopOpen‘ℂ_fld)
60	59	tgioo2 24311	. . . . . . . . . 10 ⊢ (topGen‘ran (,)) = ((TopOpen‘ℂ_fld) ↾_t ℝ)
61	41, 60	eleqtrdi 2844	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ∈ ((TopOpen‘ℂ_fld) ↾_t ℝ))
62	48, 61	dvmptidg 44620	. . . . . . . 8 ⊢ (𝜑 → (ℝ D (𝑠 ∈ 𝐴 ↦ 𝑠)) = (𝑠 ∈ 𝐴 ↦ 1))
63		ax-resscn 11164	. . . . . . . . . . 11 ⊢ ℝ ⊆ ℂ
64	63	a1i 11	. . . . . . . . . 10 ⊢ (𝜑 → ℝ ⊆ ℂ)
65	38, 64	sstrd 3992	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ⊆ ℂ)
66		1cnd 11206	. . . . . . . . 9 ⊢ (𝜑 → 1 ∈ ℂ)
67		ssid 4004	. . . . . . . . . 10 ⊢ ℂ ⊆ ℂ
68	67	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → ℂ ⊆ ℂ)
69	65, 66, 68	constcncfg 44575	. . . . . . . 8 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ 1) ∈ (𝐴–cn→ℂ))
70	62, 69	eqeltrd 2834	. . . . . . 7 ⊢ (𝜑 → (ℝ D (𝑠 ∈ 𝐴 ↦ 𝑠)) ∈ (𝐴–cn→ℂ))
71	38	resmptd 6039	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) ↾ 𝐴) = (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))))
72	71	eqcomd 2739	. . . . . . . . . 10 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))) = ((𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) ↾ 𝐴))
73	72	oveq2d 7422	. . . . . . . . 9 ⊢ (𝜑 → (ℝ D (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))) = (ℝ D ((𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) ↾ 𝐴)))
74		eqid 2733	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) = (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))
75		2cnd 12287	. . . . . . . . . . . . 13 ⊢ (𝑠 ∈ ℝ → 2 ∈ ℂ)
76		recn 11197	. . . . . . . . . . . . . . 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 7109	. . . . . . . . . . 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 4004	. . . . . . . . . . 11 ⊢ ℝ ⊆ ℝ
83	82	a1i 11	. . . . . . . . . 10 ⊢ (𝜑 → ℝ ⊆ ℝ)
84	59, 60	dvres 25420	. . . . . . . . . 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 838	. . . . . . . . 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 24270	. . . . . . . . . . . . . 14 ⊢ (topGen‘ran (,)) ∈ Top
87	86	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝜑 → (topGen‘ran (,)) ∈ Top)
88		uniretop 24271	. . . . . . . . . . . . . 14 ⊢ ℝ = ∪ (topGen‘ran (,))
89	88	isopn3 22562	. . . . . . . . . . . . 13 ⊢ (((topGen‘ran (,)) ∈ Top ∧ 𝐴 ⊆ ℝ) → (𝐴 ∈ (topGen‘ran (,)) ↔ ((int‘(topGen‘ran (,)))‘𝐴) = 𝐴))
90	87, 38, 89	syl2anc 585	. . . . . . . . . . . 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 5980	. . . . . . . . . 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 6036	. . . . . . . . . . . . . . . 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 2739	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑠 ∈ ℂ → ((1 / 2) · 𝑠) = (𝑠 / 2))
100	76, 99	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑠 ∈ ℝ → ((1 / 2) · 𝑠) = (𝑠 / 2))
101	100	fveq2d 6893	. . . . . . . . . . . . . . . . 17 ⊢ (𝑠 ∈ ℝ → (sin‘((1 / 2) · 𝑠)) = (sin‘(𝑠 / 2)))
102	101	oveq2d 7422	. . . . . . . . . . . . . . . 16 ⊢ (𝑠 ∈ ℝ → (2 · (sin‘((1 / 2) · 𝑠))) = (2 · (sin‘(𝑠 / 2))))
103	102	mpteq2ia 5251	. . . . . . . . . . . . . . 15 ⊢ (𝑠 ∈ ℝ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) = (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))
104	94, 103	eqtr2i 2762	. . . . . . . . . . . . . 14 ⊢ (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2)))) = ((𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) ↾ ℝ)
105	104	oveq2i 7417	. . . . . . . . . . . . 13 ⊢ (ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) = (ℝ D ((𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) ↾ ℝ))
106		eqid 2733	. . . . . . . . . . . . . . 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 7109	. . . . . . . . . . . . . 14 ⊢ (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))):ℂ⟶ℂ
113		2cn 12284	. . . . . . . . . . . . . . . . . . 19 ⊢ 2 ∈ ℂ
114		dvasinbx 44623	. . . . . . . . . . . . . . . . . . 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 691	. . . . . . . . . . . . . . . . . 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 6893	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑠 ∈ ℂ → (cos‘((1 / 2) · 𝑠)) = (cos‘(𝑠 / 2)))
119	117, 118	oveq12d 7424	. . . . . . . . . . . . . . . . . . . 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 2773	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑠 ∈ ℂ → ((2 · (1 / 2)) · (cos‘((1 / 2) · 𝑠))) = (cos‘(𝑠 / 2)))
124	123	mpteq2ia 5251	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑠 ∈ ℂ ↦ ((2 · (1 / 2)) · (cos‘((1 / 2) · 𝑠)))) = (𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2)))
125	115, 124	eqtri 2761	. . . . . . . . . . . . . . . . 17 ⊢ (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) = (𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2)))
126	125	dmeqi 5903	. . . . . . . . . . . . . . . 16 ⊢ dom (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) = dom (𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2)))
127		dmmptg 6239	. . . . . . . . . . . . . . . . 17 ⊢ (∀𝑠 ∈ ℂ (cos‘(𝑠 / 2)) ∈ ℂ → dom (𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) = ℂ)
128	127, 121	mprg 3068	. . . . . . . . . . . . . . . 16 ⊢ dom (𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) = ℂ
129	126, 128	eqtri 2761	. . . . . . . . . . . . . . 15 ⊢ dom (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) = ℂ
130	63, 129	sseqtrri 4019	. . . . . . . . . . . . . 14 ⊢ ℝ ⊆ dom (ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))))
131		dvres3 25422	. . . . . . . . . . . . . 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 692	. . . . . . . . . . . . 13 ⊢ (ℝ D ((𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠)))) ↾ ℝ)) = ((ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) ↾ ℝ)
133	125	reseq1i 5976	. . . . . . . . . . . . 13 ⊢ ((ℂ D (𝑠 ∈ ℂ ↦ (2 · (sin‘((1 / 2) · 𝑠))))) ↾ ℝ) = ((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ ℝ)
134	105, 132, 133	3eqtri 2765	. . . . . . . . . . . 12 ⊢ (ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) = ((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ ℝ)
135	134	reseq1i 5976	. . . . . . . . . . 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 6011	. . . . . . . . . . 11 ⊢ (𝜑 → (((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ ℝ) ↾ 𝐴) = ((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ 𝐴))
138	65	resmptd 6039	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ 𝐴) = (𝑠 ∈ 𝐴 ↦ (cos‘(𝑠 / 2))))
139	137, 138	eqtrd 2773	. . . . . . . . . 10 ⊢ (𝜑 → (((𝑠 ∈ ℂ ↦ (cos‘(𝑠 / 2))) ↾ ℝ) ↾ 𝐴) = (𝑠 ∈ 𝐴 ↦ (cos‘(𝑠 / 2))))
140	92, 136, 139	3eqtrd 2777	. . . . . . . . 9 ⊢ (𝜑 → ((ℝ D (𝑠 ∈ ℝ ↦ (2 · (sin‘(𝑠 / 2))))) ↾ ((int‘(topGen‘ran (,)))‘𝐴)) = (𝑠 ∈ 𝐴 ↦ (cos‘(𝑠 / 2))))
141	73, 85, 140	3eqtrd 2777	. . . . . . . 8 ⊢ (𝜑 → (ℝ D (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))) = (𝑠 ∈ 𝐴 ↦ (cos‘(𝑠 / 2))))
142		coscn 25949	. . . . . . . . . 10 ⊢ cos ∈ (ℂ–cn→ℂ)
143	142	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → cos ∈ (ℂ–cn→ℂ))
144	65, 68	idcncfg 44576	. . . . . . . . . 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 4790	. . . . . . . . . . . 12 ⊢ (2 ∈ (ℂ ∖ {0}) ↔ (2 ∈ ℂ ∧ 2 ≠ 0))
148	145, 146, 147	sylanbrc 584	. . . . . . . . . . 11 ⊢ (𝜑 → 2 ∈ (ℂ ∖ {0}))
149		difssd 4132	. . . . . . . . . . 11 ⊢ (𝜑 → (ℂ ∖ {0}) ⊆ ℂ)
150	65, 148, 149	constcncfg 44575	. . . . . . . . . 10 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ 2) ∈ (𝐴–cn→(ℂ ∖ {0})))
151	144, 150	divcncf 24956	. . . . . . . . 9 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ (𝑠 / 2)) ∈ (𝐴–cn→ℂ))
152	143, 151	cncfmpt1f 24422	. . . . . . . 8 ⊢ (𝜑 → (𝑠 ∈ 𝐴 ↦ (cos‘(𝑠 / 2))) ∈ (𝐴–cn→ℂ))
153	141, 152	eqeltrd 2834	. . . . . . 7 ⊢ (𝜑 → (ℝ D (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2))))) ∈ (𝐴–cn→ℂ))
154	48, 50, 58, 70, 153	dvdivcncf 44630	. . . . . 6 ⊢ (𝜑 → (ℝ D ((𝑠 ∈ 𝐴 ↦ 𝑠) ∘_f / (𝑠 ∈ 𝐴 ↦ (2 · (sin‘(𝑠 / 2)))))) ∈ (𝐴–cn→ℂ))
155	46, 154	eqeltrd 2834	. . . . 5 ⊢ (𝜑 → (ℝ D 𝐾) ∈ (𝐴–cn→ℂ))
156		cncff 24401	. . . . 5 ⊢ ((ℝ D 𝐾) ∈ (𝐴–cn→ℂ) → (ℝ D 𝐾):𝐴⟶ℂ)
157		fdm 6724	. . . . 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 6701	. . 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 24406	. . 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 585	. 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 397 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ∖ cdif 3945 ⊆ wss 3948 {csn 4628 {cpr 4630 ↦ cmpt 5231 dom cdm 5676 ran crn 5677 ↾ cres 5678 ⟶wf 6537 ‘cfv 6541 (class class class)co 7406 ∘_f cof 7665 ℂcc 11105 ℝcr 11106 0cc0 11107 1c1 11108 · cmul 11112 -cneg 11442 / cdiv 11868 2c2 12264 (,)cioo 13321 [,]cicc 13324 sincsin 16004 cosccos 16005 πcpi 16007 ↾_t crest 17363 TopOpenctopn 17364 topGenctg 17380 ℂ_fldccnfld 20937 Topctop 22387 intcnt 22513 –cn→ccncf 24384 D cdv 25372

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7722 ax-inf2 9633 ax-cnex 11163 ax-resscn 11164 ax-1cn 11165 ax-icn 11166 ax-addcl 11167 ax-addrcl 11168 ax-mulcl 11169 ax-mulrcl 11170 ax-mulcom 11171 ax-addass 11172 ax-mulass 11173 ax-distr 11174 ax-i2m1 11175 ax-1ne0 11176 ax-1rid 11177 ax-rnegex 11178 ax-rrecex 11179 ax-cnre 11180 ax-pre-lttri 11181 ax-pre-lttrn 11182 ax-pre-ltadd 11183 ax-pre-mulgt0 11184 ax-pre-sup 11185 ax-addf 11186 ax-mulf 11187

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-tp 4633 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-iin 5000 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-se 5632 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6298 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6493 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-isom 6550 df-riota 7362 df-ov 7409 df-oprab 7410 df-mpo 7411 df-of 7667 df-om 7853 df-1st 7972 df-2nd 7973 df-supp 8144 df-frecs 8263 df-wrecs 8294 df-recs 8368 df-rdg 8407 df-1o 8463 df-2o 8464 df-er 8700 df-map 8819 df-pm 8820 df-ixp 8889 df-en 8937 df-dom 8938 df-sdom 8939 df-fin 8940 df-fsupp 9359 df-fi 9403 df-sup 9434 df-inf 9435 df-oi 9502 df-card 9931 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 17077 df-sets 17094 df-slot 17112 df-ndx 17124 df-base 17142 df-ress 17171 df-plusg 17207 df-mulr 17208 df-starv 17209 df-sca 17210 df-vsca 17211 df-ip 17212 df-tset 17213 df-ple 17214 df-ds 17216 df-unif 17217 df-hom 17218 df-cco 17219 df-rest 17365 df-topn 17366 df-0g 17384 df-gsum 17385 df-topgen 17386 df-pt 17387 df-prds 17390 df-xrs 17445 df-qtop 17450 df-imas 17451 df-xps 17453 df-mre 17527 df-mrc 17528 df-acs 17530 df-mgm 18558 df-sgrp 18607 df-mnd 18623 df-submnd 18669 df-mulg 18946 df-cntz 19176 df-cmn 19645 df-psmet 20929 df-xmet 20930 df-met 20931 df-bl 20932 df-mopn 20933 df-fbas 20934 df-fg 20935 df-cnfld 20938 df-top 22388 df-topon 22405 df-topsp 22427 df-bases 22441 df-cld 22515 df-ntr 22516 df-cls 22517 df-nei 22594 df-lp 22632 df-perf 22633 df-cn 22723 df-cnp 22724 df-t1 22810 df-haus 22811 df-tx 23058 df-hmeo 23251 df-fil 23342 df-fm 23434 df-flim 23435 df-flf 23436 df-xms 23818 df-ms 23819 df-tms 23820 df-cncf 24386 df-limc 25375 df-dv 25376

This theorem is referenced by: fourierdlem72 44881

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