fourierdlem40 - Mathbox for Glauco Siliprandi

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Theorem fourierdlem40 46118

Description: 𝐻 is a continuous function on any partition interval. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypotheses**
Ref	Expression
fourierdlem40.f	⊢ (𝜑 → 𝐹:ℝ⟶ℝ)
fourierdlem40.a	⊢ (𝜑 → 𝐴 ∈ (-π[,]π))
fourierdlem40.b	⊢ (𝜑 → 𝐵 ∈ (-π[,]π))
fourierdlem40.x	⊢ (𝜑 → 𝑋 ∈ ℝ)
fourierdlem40.nxelab	⊢ (𝜑 → ¬ 0 ∈ (𝐴(,)𝐵))
fourierdlem40.fcn	⊢ (𝜑 → (𝐹 ↾ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋))) ∈ (((𝐴 + 𝑋)(,)(𝐵 + 𝑋))–cn→ℂ))
fourierdlem40.y	⊢ (𝜑 → 𝑌 ∈ ℝ)
fourierdlem40.w	⊢ (𝜑 → 𝑊 ∈ ℝ)
fourierdlem40.h	⊢ 𝐻 = (𝑠 ∈ (-π[,]π) ↦ if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠)))

**Assertion**
Ref	Expression
fourierdlem40	⊢ (𝜑 → (𝐻 ↾ (𝐴(,)𝐵)) ∈ ((𝐴(,)𝐵)–cn→ℂ))

Distinct variable groups: 𝐴,𝑠 𝐵,𝑠 𝐹,𝑠 𝑊,𝑠 𝑋,𝑠 𝑌,𝑠 𝜑,𝑠 Allowed substitution hint: 𝐻(𝑠)

**Proof of Theorem fourierdlem40**
Step	Hyp	Ref	Expression
1		fourierdlem40.h	. . . . 5 ⊢ 𝐻 = (𝑠 ∈ (-π[,]π) ↦ if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠)))
2	1	reseq1i 5935	. . . 4 ⊢ (𝐻 ↾ (𝐴(,)𝐵)) = ((𝑠 ∈ (-π[,]π) ↦ if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠))) ↾ (𝐴(,)𝐵))
3	2	a1i 11	. . 3 ⊢ (𝜑 → (𝐻 ↾ (𝐴(,)𝐵)) = ((𝑠 ∈ (-π[,]π) ↦ if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠))) ↾ (𝐴(,)𝐵)))
4		pire 26342	. . . . . . . . 9 ⊢ π ∈ ℝ
5	4	renegcli 11459	. . . . . . . 8 ⊢ -π ∈ ℝ
6	5	a1i 11	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -π ∈ ℝ)
7	4	a1i 11	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → π ∈ ℝ)
8		elioore 13312	. . . . . . . 8 ⊢ (𝑠 ∈ (𝐴(,)𝐵) → 𝑠 ∈ ℝ)
9	8	adantl 481	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ ℝ)
10	5	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → -π ∈ ℝ)
11	4	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → π ∈ ℝ)
12	10, 11	iccssred 13371	. . . . . . . . . . 11 ⊢ (𝜑 → (-π[,]π) ⊆ ℝ)
13		fourierdlem40.a	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐴 ∈ (-π[,]π))
14	12, 13	sseldd 3944	. . . . . . . . . 10 ⊢ (𝜑 → 𝐴 ∈ ℝ)
15	14	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 ∈ ℝ)
16	5, 4	elicc2i 13349	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ (-π[,]π) ↔ (𝐴 ∈ ℝ ∧ -π ≤ 𝐴 ∧ 𝐴 ≤ π))
17	16	simp2bi 1146	. . . . . . . . . . 11 ⊢ (𝐴 ∈ (-π[,]π) → -π ≤ 𝐴)
18	13, 17	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → -π ≤ 𝐴)
19	18	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -π ≤ 𝐴)
20	15	rexrd 11200	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 ∈ ℝ^*)
21		fourierdlem40.b	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐵 ∈ (-π[,]π))
22	12, 21	sseldd 3944	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐵 ∈ ℝ)
23	22	rexrd 11200	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
24	23	adantr 480	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐵 ∈ ℝ^*)
25		simpr 484	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ (𝐴(,)𝐵))
26		ioogtlb 45466	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 < 𝑠)
27	20, 24, 25, 26	syl3anc 1373	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 < 𝑠)
28	6, 15, 9, 19, 27	lelttrd 11308	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -π < 𝑠)
29	6, 9, 28	ltled 11298	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -π ≤ 𝑠)
30	22	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐵 ∈ ℝ)
31		iooltub 45481	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 < 𝐵)
32	20, 24, 25, 31	syl3anc 1373	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 < 𝐵)
33	5, 4	elicc2i 13349	. . . . . . . . . . . 12 ⊢ (𝐵 ∈ (-π[,]π) ↔ (𝐵 ∈ ℝ ∧ -π ≤ 𝐵 ∧ 𝐵 ≤ π))
34	33	simp3bi 1147	. . . . . . . . . . 11 ⊢ (𝐵 ∈ (-π[,]π) → 𝐵 ≤ π)
35	21, 34	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → 𝐵 ≤ π)
36	35	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐵 ≤ π)
37	9, 30, 7, 32, 36	ltletrd 11310	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 < π)
38	9, 7, 37	ltled 11298	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ≤ π)
39	6, 7, 9, 29, 38	eliccd 45475	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ (-π[,]π))
40	39	ex 412	. . . . 5 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) → 𝑠 ∈ (-π[,]π)))
41	40	ssrdv 3949	. . . 4 ⊢ (𝜑 → (𝐴(,)𝐵) ⊆ (-π[,]π))
42	41	resmptd 6000	. . 3 ⊢ (𝜑 → ((𝑠 ∈ (-π[,]π) ↦ if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠))) ↾ (𝐴(,)𝐵)) = (𝑠 ∈ (𝐴(,)𝐵) ↦ if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠))))
43		eleq1 2816	. . . . . . . . 9 ⊢ (𝑠 = 0 → (𝑠 ∈ (𝐴(,)𝐵) ↔ 0 ∈ (𝐴(,)𝐵)))
44	43	biimpac 478	. . . . . . . 8 ⊢ ((𝑠 ∈ (𝐴(,)𝐵) ∧ 𝑠 = 0) → 0 ∈ (𝐴(,)𝐵))
45	44	adantll 714	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) ∧ 𝑠 = 0) → 0 ∈ (𝐴(,)𝐵))
46		fourierdlem40.nxelab	. . . . . . . 8 ⊢ (𝜑 → ¬ 0 ∈ (𝐴(,)𝐵))
47	46	ad2antrr 726	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) ∧ 𝑠 = 0) → ¬ 0 ∈ (𝐴(,)𝐵))
48	45, 47	pm2.65da 816	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ¬ 𝑠 = 0)
49	48	iffalsed 4495	. . . . 5 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠)) = (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠))
50		fourierdlem40.f	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹:ℝ⟶ℝ)
51	50	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐹:ℝ⟶ℝ)
52		fourierdlem40.x	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑋 ∈ ℝ)
53	52	adantr 480	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑋 ∈ ℝ)
54	53, 9	readdcld 11179	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝑠) ∈ ℝ)
55	51, 54	ffvelcdmd 7039	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐹‘(𝑋 + 𝑠)) ∈ ℝ)
56		fourierdlem40.y	. . . . . . . . . 10 ⊢ (𝜑 → 𝑌 ∈ ℝ)
57		fourierdlem40.w	. . . . . . . . . 10 ⊢ (𝜑 → 𝑊 ∈ ℝ)
58	56, 57	ifcld 4531	. . . . . . . . 9 ⊢ (𝜑 → if(0 < 𝑠, 𝑌, 𝑊) ∈ ℝ)
59	58	adantr 480	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → if(0 < 𝑠, 𝑌, 𝑊) ∈ ℝ)
60	55, 59	resubcld 11582	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) ∈ ℝ)
61	60	recnd 11178	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) ∈ ℂ)
62	9	recnd 11178	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ ℂ)
63	48	neqned 2932	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ≠ 0)
64	61, 62, 63	divrecd 11937	. . . . 5 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠) = (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) · (1 / 𝑠)))
65	49, 64	eqtrd 2764	. . . 4 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠)) = (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) · (1 / 𝑠)))
66	65	mpteq2dva 5195	. . 3 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ if(𝑠 = 0, 0, (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) / 𝑠))) = (𝑠 ∈ (𝐴(,)𝐵) ↦ (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) · (1 / 𝑠))))
67	3, 42, 66	3eqtrd 2768	. 2 ⊢ (𝜑 → (𝐻 ↾ (𝐴(,)𝐵)) = (𝑠 ∈ (𝐴(,)𝐵) ↦ (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) · (1 / 𝑠))))
68	55	recnd 11178	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐹‘(𝑋 + 𝑠)) ∈ ℂ)
69	59	recnd 11178	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → if(0 < 𝑠, 𝑌, 𝑊) ∈ ℂ)
70	68, 69	negsubd 11515	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ((𝐹‘(𝑋 + 𝑠)) + -if(0 < 𝑠, 𝑌, 𝑊)) = ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)))
71	70	eqcomd 2735	. . . . 5 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) = ((𝐹‘(𝑋 + 𝑠)) + -if(0 < 𝑠, 𝑌, 𝑊)))
72	71	mpteq2dva 5195	. . . 4 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊))) = (𝑠 ∈ (𝐴(,)𝐵) ↦ ((𝐹‘(𝑋 + 𝑠)) + -if(0 < 𝑠, 𝑌, 𝑊))))
73	14, 52	readdcld 11179	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 + 𝑋) ∈ ℝ)
74	73	rexrd 11200	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐴 + 𝑋) ∈ ℝ^*)
75	74	adantr 480	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐴 + 𝑋) ∈ ℝ^*)
76	22, 52	readdcld 11179	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐵 + 𝑋) ∈ ℝ)
77	76	rexrd 11200	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐵 + 𝑋) ∈ ℝ^*)
78	77	adantr 480	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐵 + 𝑋) ∈ ℝ^*)
79	14	recnd 11178	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐴 ∈ ℂ)
80	52	recnd 11178	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑋 ∈ ℂ)
81	79, 80	addcomd 11352	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 + 𝑋) = (𝑋 + 𝐴))
82	81	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐴 + 𝑋) = (𝑋 + 𝐴))
83	15, 9, 53, 27	ltadd2dd 11309	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝐴) < (𝑋 + 𝑠))
84	82, 83	eqbrtrd 5124	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐴 + 𝑋) < (𝑋 + 𝑠))
85	9, 30, 53, 32	ltadd2dd 11309	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝑠) < (𝑋 + 𝐵))
86	22	recnd 11178	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐵 ∈ ℂ)
87	80, 86	addcomd 11352	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑋 + 𝐵) = (𝐵 + 𝑋))
88	87	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝐵) = (𝐵 + 𝑋))
89	85, 88	breqtrd 5128	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝑠) < (𝐵 + 𝑋))
90	75, 78, 54, 84, 89	eliood 45469	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝑠) ∈ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)))
91		fvres 6859	. . . . . . . . 9 ⊢ ((𝑋 + 𝑠) ∈ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)) → ((𝐹 ↾ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)))‘(𝑋 + 𝑠)) = (𝐹‘(𝑋 + 𝑠)))
92	90, 91	syl 17	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ((𝐹 ↾ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)))‘(𝑋 + 𝑠)) = (𝐹‘(𝑋 + 𝑠)))
93	92	eqcomd 2735	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐹‘(𝑋 + 𝑠)) = ((𝐹 ↾ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)))‘(𝑋 + 𝑠)))
94	93	mpteq2dva 5195	. . . . . 6 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ (𝐹‘(𝑋 + 𝑠))) = (𝑠 ∈ (𝐴(,)𝐵) ↦ ((𝐹 ↾ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)))‘(𝑋 + 𝑠))))
95		ioosscn 13345	. . . . . . . 8 ⊢ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)) ⊆ ℂ
96	95	a1i 11	. . . . . . 7 ⊢ (𝜑 → ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)) ⊆ ℂ)
97		fourierdlem40.fcn	. . . . . . 7 ⊢ (𝜑 → (𝐹 ↾ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋))) ∈ (((𝐴 + 𝑋)(,)(𝐵 + 𝑋))–cn→ℂ))
98		ioosscn 13345	. . . . . . . 8 ⊢ (𝐴(,)𝐵) ⊆ ℂ
99	98	a1i 11	. . . . . . 7 ⊢ (𝜑 → (𝐴(,)𝐵) ⊆ ℂ)
100	96, 97, 99, 80, 90	fourierdlem23 46101	. . . . . 6 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ ((𝐹 ↾ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)))‘(𝑋 + 𝑠))) ∈ ((𝐴(,)𝐵)–cn→ℂ))
101	94, 100	eqeltrd 2828	. . . . 5 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ (𝐹‘(𝑋 + 𝑠))) ∈ ((𝐴(,)𝐵)–cn→ℂ))
102		0red 11153	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 0 ∈ ℝ)
103	14	ad2antrr 726	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 ∈ ℝ)
104	8	adantl 481	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ ℝ)
105		simplr 768	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 0 ≤ 𝐴)
106	27	adantlr 715	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 < 𝑠)
107	102, 103, 104, 105, 106	lelttrd 11308	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 0 < 𝑠)
108	107	iftrued 4492	. . . . . . . . 9 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → if(0 < 𝑠, 𝑌, 𝑊) = 𝑌)
109	108	negeqd 11391	. . . . . . . 8 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -if(0 < 𝑠, 𝑌, 𝑊) = -𝑌)
110	109	mpteq2dva 5195	. . . . . . 7 ⊢ ((𝜑 ∧ 0 ≤ 𝐴) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -if(0 < 𝑠, 𝑌, 𝑊)) = (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑌))
111	56	renegcld 11581	. . . . . . . . . 10 ⊢ (𝜑 → -𝑌 ∈ ℝ)
112	111	recnd 11178	. . . . . . . . 9 ⊢ (𝜑 → -𝑌 ∈ ℂ)
113		ssid 3966	. . . . . . . . . 10 ⊢ ℂ ⊆ ℂ
114	113	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → ℂ ⊆ ℂ)
115	99, 112, 114	constcncfg 45843	. . . . . . . 8 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑌) ∈ ((𝐴(,)𝐵)–cn→ℂ))
116	115	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ 0 ≤ 𝐴) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑌) ∈ ((𝐴(,)𝐵)–cn→ℂ))
117	110, 116	eqeltrd 2828	. . . . . 6 ⊢ ((𝜑 ∧ 0 ≤ 𝐴) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -if(0 < 𝑠, 𝑌, 𝑊)) ∈ ((𝐴(,)𝐵)–cn→ℂ))
118	14	rexrd 11200	. . . . . . . . . 10 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
119	118	ad2antrr 726	. . . . . . . . 9 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 𝐴 ∈ ℝ^*)
120	23	ad2antrr 726	. . . . . . . . 9 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 𝐵 ∈ ℝ^*)
121		0red 11153	. . . . . . . . 9 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 0 ∈ ℝ)
122		simpr 484	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → ¬ 0 ≤ 𝐴)
123	14	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → 𝐴 ∈ ℝ)
124		0red 11153	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → 0 ∈ ℝ)
125	123, 124	ltnled 11297	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → (𝐴 < 0 ↔ ¬ 0 ≤ 𝐴))
126	122, 125	mpbird 257	. . . . . . . . . 10 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → 𝐴 < 0)
127	126	adantr 480	. . . . . . . . 9 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 𝐴 < 0)
128		simpr 484	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 0) → ¬ 𝐵 ≤ 0)
129		0red 11153	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 0) → 0 ∈ ℝ)
130	22	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 0) → 𝐵 ∈ ℝ)
131	129, 130	ltnled 11297	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 0) → (0 < 𝐵 ↔ ¬ 𝐵 ≤ 0))
132	128, 131	mpbird 257	. . . . . . . . . 10 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 0) → 0 < 𝐵)
133	132	adantlr 715	. . . . . . . . 9 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 0 < 𝐵)
134	119, 120, 121, 127, 133	eliood 45469	. . . . . . . 8 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 0 ∈ (𝐴(,)𝐵))
135	46	ad2antrr 726	. . . . . . . 8 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → ¬ 0 ∈ (𝐴(,)𝐵))
136	134, 135	condan 817	. . . . . . 7 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → 𝐵 ≤ 0)
137	8	adantl 481	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ ℝ)
138		0red 11153	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 0 ∈ ℝ)
139	22	ad2antrr 726	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐵 ∈ ℝ)
140	32	adantlr 715	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 < 𝐵)
141		simplr 768	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐵 ≤ 0)
142	137, 139, 138, 140, 141	ltletrd 11310	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 < 0)
143	137, 138, 142	ltnsymd 11299	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ¬ 0 < 𝑠)
144	143	iffalsed 4495	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → if(0 < 𝑠, 𝑌, 𝑊) = 𝑊)
145	144	negeqd 11391	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -if(0 < 𝑠, 𝑌, 𝑊) = -𝑊)
146	145	mpteq2dva 5195	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐵 ≤ 0) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -if(0 < 𝑠, 𝑌, 𝑊)) = (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑊))
147	57	recnd 11178	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑊 ∈ ℂ)
148	147	negcld 11496	. . . . . . . . . 10 ⊢ (𝜑 → -𝑊 ∈ ℂ)
149	99, 148, 114	constcncfg 45843	. . . . . . . . 9 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑊) ∈ ((𝐴(,)𝐵)–cn→ℂ))
150	149	adantr 480	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐵 ≤ 0) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑊) ∈ ((𝐴(,)𝐵)–cn→ℂ))
151	146, 150	eqeltrd 2828	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 ≤ 0) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -if(0 < 𝑠, 𝑌, 𝑊)) ∈ ((𝐴(,)𝐵)–cn→ℂ))
152	136, 151	syldan 591	. . . . . 6 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -if(0 < 𝑠, 𝑌, 𝑊)) ∈ ((𝐴(,)𝐵)–cn→ℂ))
153	117, 152	pm2.61dan 812	. . . . 5 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ -if(0 < 𝑠, 𝑌, 𝑊)) ∈ ((𝐴(,)𝐵)–cn→ℂ))
154	101, 153	addcncf 25320	. . . 4 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ ((𝐹‘(𝑋 + 𝑠)) + -if(0 < 𝑠, 𝑌, 𝑊))) ∈ ((𝐴(,)𝐵)–cn→ℂ))
155	72, 154	eqeltrd 2828	. . 3 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊))) ∈ ((𝐴(,)𝐵)–cn→ℂ))
156		eqid 2729	. . . 4 ⊢ (𝑠 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑠)) = (𝑠 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑠))
157		1cnd 11145	. . . . 5 ⊢ (𝜑 → 1 ∈ ℂ)
158	156	cdivcncf 24790	. . . . 5 ⊢ (1 ∈ ℂ → (𝑠 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑠)) ∈ ((ℂ ∖ {0})–cn→ℂ))
159	157, 158	syl 17	. . . 4 ⊢ (𝜑 → (𝑠 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑠)) ∈ ((ℂ ∖ {0})–cn→ℂ))
160		velsn 4601	. . . . . . . 8 ⊢ (𝑠 ∈ {0} ↔ 𝑠 = 0)
161	48, 160	sylnibr 329	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ¬ 𝑠 ∈ {0})
162	62, 161	eldifd 3922	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ (ℂ ∖ {0}))
163	162	ralrimiva 3125	. . . . 5 ⊢ (𝜑 → ∀𝑠 ∈ (𝐴(,)𝐵)𝑠 ∈ (ℂ ∖ {0}))
164		dfss3 3932	. . . . 5 ⊢ ((𝐴(,)𝐵) ⊆ (ℂ ∖ {0}) ↔ ∀𝑠 ∈ (𝐴(,)𝐵)𝑠 ∈ (ℂ ∖ {0}))
165	163, 164	sylibr 234	. . . 4 ⊢ (𝜑 → (𝐴(,)𝐵) ⊆ (ℂ ∖ {0}))
166	9, 63	rereccld 11985	. . . . 5 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (1 / 𝑠) ∈ ℝ)
167	166	recnd 11178	. . . 4 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (1 / 𝑠) ∈ ℂ)
168	156, 159, 165, 114, 167	cncfmptssg 45842	. . 3 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ (1 / 𝑠)) ∈ ((𝐴(,)𝐵)–cn→ℂ))
169	155, 168	mulcncf 25322	. 2 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) · (1 / 𝑠))) ∈ ((𝐴(,)𝐵)–cn→ℂ))
170	67, 169	eqeltrd 2828	1 ⊢ (𝜑 → (𝐻 ↾ (𝐴(,)𝐵)) ∈ ((𝐴(,)𝐵)–cn→ℂ))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 = wceq 1540 ∈ wcel 2109 ∀wral 3044 ∖ cdif 3908 ⊆ wss 3911 ifcif 4484 {csn 4585 class class class wbr 5102 ↦ cmpt 5183 ↾ cres 5633 ⟶wf 6495 ‘cfv 6499 (class class class)co 7369 ℂcc 11042 ℝcr 11043 0cc0 11044 1c1 11045 + caddc 11047 · cmul 11049 ℝ^*cxr 11183 < clt 11184 ≤ cle 11185 − cmin 11381 -cneg 11382 / cdiv 11811 (,)cioo 13282 [,]cicc 13285 πcpi 16008 –cn→ccncf 24745

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5229 ax-sep 5246 ax-nul 5256 ax-pow 5315 ax-pr 5382 ax-un 7691 ax-inf2 9570 ax-cnex 11100 ax-resscn 11101 ax-1cn 11102 ax-icn 11103 ax-addcl 11104 ax-addrcl 11105 ax-mulcl 11106 ax-mulrcl 11107 ax-mulcom 11108 ax-addass 11109 ax-mulass 11110 ax-distr 11111 ax-i2m1 11112 ax-1ne0 11113 ax-1rid 11114 ax-rnegex 11115 ax-rrecex 11116 ax-cnre 11117 ax-pre-lttri 11118 ax-pre-lttrn 11119 ax-pre-ltadd 11120 ax-pre-mulgt0 11121 ax-pre-sup 11122 ax-addf 11123

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3351 df-reu 3352 df-rab 3403 df-v 3446 df-sbc 3751 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3931 df-nul 4293 df-if 4485 df-pw 4561 df-sn 4586 df-pr 4588 df-tp 4590 df-op 4592 df-uni 4868 df-int 4907 df-iun 4953 df-iin 4954 df-br 5103 df-opab 5165 df-mpt 5184 df-tr 5210 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-se 5585 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6262 df-ord 6323 df-on 6324 df-lim 6325 df-suc 6326 df-iota 6452 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-isom 6508 df-riota 7326 df-ov 7372 df-oprab 7373 df-mpo 7374 df-of 7633 df-om 7823 df-1st 7947 df-2nd 7948 df-supp 8117 df-frecs 8237 df-wrecs 8268 df-recs 8317 df-rdg 8355 df-1o 8411 df-2o 8412 df-er 8648 df-map 8778 df-pm 8779 df-ixp 8848 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-fsupp 9289 df-fi 9338 df-sup 9369 df-inf 9370 df-oi 9439 df-card 9868 df-pnf 11186 df-mnf 11187 df-xr 11188 df-ltxr 11189 df-le 11190 df-sub 11383 df-neg 11384 df-div 11812 df-nn 12163 df-2 12225 df-3 12226 df-4 12227 df-5 12228 df-6 12229 df-7 12230 df-8 12231 df-9 12232 df-n0 12419 df-z 12506 df-dec 12626 df-uz 12770 df-q 12884 df-rp 12928 df-xneg 13048 df-xadd 13049 df-xmul 13050 df-ioo 13286 df-ioc 13287 df-ico 13288 df-icc 13289 df-fz 13445 df-fzo 13592 df-fl 13730 df-seq 13943 df-exp 14003 df-fac 14215 df-bc 14244 df-hash 14272 df-shft 15009 df-cj 15041 df-re 15042 df-im 15043 df-sqrt 15177 df-abs 15178 df-limsup 15413 df-clim 15430 df-rlim 15431 df-sum 15629 df-ef 16009 df-sin 16011 df-cos 16012 df-pi 16014 df-struct 17093 df-sets 17110 df-slot 17128 df-ndx 17140 df-base 17156 df-ress 17177 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 17361 df-topn 17362 df-0g 17380 df-gsum 17381 df-topgen 17382 df-pt 17383 df-prds 17386 df-xrs 17441 df-qtop 17446 df-imas 17447 df-xps 17449 df-mre 17523 df-mrc 17524 df-acs 17526 df-mgm 18543 df-sgrp 18622 df-mnd 18638 df-submnd 18687 df-mulg 18976 df-cntz 19225 df-cmn 19688 df-psmet 21232 df-xmet 21233 df-met 21234 df-bl 21235 df-mopn 21236 df-fbas 21237 df-fg 21238 df-cnfld 21241 df-top 22757 df-topon 22774 df-topsp 22796 df-bases 22809 df-cld 22882 df-ntr 22883 df-cls 22884 df-nei 22961 df-lp 22999 df-perf 23000 df-cn 23090 df-cnp 23091 df-haus 23178 df-tx 23425 df-hmeo 23618 df-fil 23709 df-fm 23801 df-flim 23802 df-flf 23803 df-xms 24184 df-ms 24185 df-tms 24186 df-cncf 24747 df-limc 25743 df-dv 25744

This theorem is referenced by: fourierdlem103 46180 fourierdlem104 46181

W3C validator