fourierdlem40 - Mathbox for Glauco Siliprandi

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Theorem fourierdlem40 43688

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 5887	. . . 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 25615	. . . . . . . . 9 ⊢ π ∈ ℝ
5	4	renegcli 11282	. . . . . . . 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 13109	. . . . . . . 8 ⊢ (𝑠 ∈ (𝐴(,)𝐵) → 𝑠 ∈ ℝ)
9	8	adantl 482	. . . . . . 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 13166	. . . . . . . . . . 11 ⊢ (𝜑 → (-π[,]π) ⊆ ℝ)
13		fourierdlem40.a	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐴 ∈ (-π[,]π))
14	12, 13	sseldd 3922	. . . . . . . . . 10 ⊢ (𝜑 → 𝐴 ∈ ℝ)
15	14	adantr 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 ∈ ℝ)
16	5, 4	elicc2i 13145	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ (-π[,]π) ↔ (𝐴 ∈ ℝ ∧ -π ≤ 𝐴 ∧ 𝐴 ≤ π))
17	16	simp2bi 1145	. . . . . . . . . . 11 ⊢ (𝐴 ∈ (-π[,]π) → -π ≤ 𝐴)
18	13, 17	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → -π ≤ 𝐴)
19	18	adantr 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -π ≤ 𝐴)
20	15	rexrd 11025	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 ∈ ℝ^*)
21		fourierdlem40.b	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐵 ∈ (-π[,]π))
22	12, 21	sseldd 3922	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐵 ∈ ℝ)
23	22	rexrd 11025	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
24	23	adantr 481	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐵 ∈ ℝ^*)
25		simpr 485	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ (𝐴(,)𝐵))
26		ioogtlb 43033	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 < 𝑠)
27	20, 24, 25, 26	syl3anc 1370	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 < 𝑠)
28	6, 15, 9, 19, 27	lelttrd 11133	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -π < 𝑠)
29	6, 9, 28	ltled 11123	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -π ≤ 𝑠)
30	22	adantr 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐵 ∈ ℝ)
31		iooltub 43048	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 < 𝐵)
32	20, 24, 25, 31	syl3anc 1370	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 < 𝐵)
33	5, 4	elicc2i 13145	. . . . . . . . . . . 12 ⊢ (𝐵 ∈ (-π[,]π) ↔ (𝐵 ∈ ℝ ∧ -π ≤ 𝐵 ∧ 𝐵 ≤ π))
34	33	simp3bi 1146	. . . . . . . . . . 11 ⊢ (𝐵 ∈ (-π[,]π) → 𝐵 ≤ π)
35	21, 34	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → 𝐵 ≤ π)
36	35	adantr 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐵 ≤ π)
37	9, 30, 7, 32, 36	ltletrd 11135	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 < π)
38	9, 7, 37	ltled 11123	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ≤ π)
39	6, 7, 9, 29, 38	eliccd 43042	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ (-π[,]π))
40	39	ex 413	. . . . 5 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) → 𝑠 ∈ (-π[,]π)))
41	40	ssrdv 3927	. . . 4 ⊢ (𝜑 → (𝐴(,)𝐵) ⊆ (-π[,]π))
42	41	resmptd 5948	. . 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 2826	. . . . . . . . 9 ⊢ (𝑠 = 0 → (𝑠 ∈ (𝐴(,)𝐵) ↔ 0 ∈ (𝐴(,)𝐵)))
44	43	biimpac 479	. . . . . . . 8 ⊢ ((𝑠 ∈ (𝐴(,)𝐵) ∧ 𝑠 = 0) → 0 ∈ (𝐴(,)𝐵))
45	44	adantll 711	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) ∧ 𝑠 = 0) → 0 ∈ (𝐴(,)𝐵))
46		fourierdlem40.nxelab	. . . . . . . 8 ⊢ (𝜑 → ¬ 0 ∈ (𝐴(,)𝐵))
47	46	ad2antrr 723	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) ∧ 𝑠 = 0) → ¬ 0 ∈ (𝐴(,)𝐵))
48	45, 47	pm2.65da 814	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ¬ 𝑠 = 0)
49	48	iffalsed 4470	. . . . 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 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐹:ℝ⟶ℝ)
52		fourierdlem40.x	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑋 ∈ ℝ)
53	52	adantr 481	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑋 ∈ ℝ)
54	53, 9	readdcld 11004	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝑠) ∈ ℝ)
55	51, 54	ffvelrnd 6962	. . . . . . . 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 4505	. . . . . . . . 9 ⊢ (𝜑 → if(0 < 𝑠, 𝑌, 𝑊) ∈ ℝ)
59	58	adantr 481	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → if(0 < 𝑠, 𝑌, 𝑊) ∈ ℝ)
60	55, 59	resubcld 11403	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) ∈ ℝ)
61	60	recnd 11003	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) ∈ ℂ)
62	9	recnd 11003	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ ℂ)
63	48	neqned 2950	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ≠ 0)
64	61, 62, 63	divrecd 11754	. . . . 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 2778	. . . 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 5174	. . 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 2782	. 2 ⊢ (𝜑 → (𝐻 ↾ (𝐴(,)𝐵)) = (𝑠 ∈ (𝐴(,)𝐵) ↦ (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) · (1 / 𝑠))))
68	55	recnd 11003	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐹‘(𝑋 + 𝑠)) ∈ ℂ)
69	59	recnd 11003	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → if(0 < 𝑠, 𝑌, 𝑊) ∈ ℂ)
70	68, 69	negsubd 11338	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ((𝐹‘(𝑋 + 𝑠)) + -if(0 < 𝑠, 𝑌, 𝑊)) = ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)))
71	70	eqcomd 2744	. . . . 5 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) = ((𝐹‘(𝑋 + 𝑠)) + -if(0 < 𝑠, 𝑌, 𝑊)))
72	71	mpteq2dva 5174	. . . 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 11004	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 + 𝑋) ∈ ℝ)
74	73	rexrd 11025	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐴 + 𝑋) ∈ ℝ^*)
75	74	adantr 481	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐴 + 𝑋) ∈ ℝ^*)
76	22, 52	readdcld 11004	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐵 + 𝑋) ∈ ℝ)
77	76	rexrd 11025	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐵 + 𝑋) ∈ ℝ^*)
78	77	adantr 481	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐵 + 𝑋) ∈ ℝ^*)
79	14	recnd 11003	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐴 ∈ ℂ)
80	52	recnd 11003	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑋 ∈ ℂ)
81	79, 80	addcomd 11177	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 + 𝑋) = (𝑋 + 𝐴))
82	81	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐴 + 𝑋) = (𝑋 + 𝐴))
83	15, 9, 53, 27	ltadd2dd 11134	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝐴) < (𝑋 + 𝑠))
84	82, 83	eqbrtrd 5096	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐴 + 𝑋) < (𝑋 + 𝑠))
85	9, 30, 53, 32	ltadd2dd 11134	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝑠) < (𝑋 + 𝐵))
86	22	recnd 11003	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐵 ∈ ℂ)
87	80, 86	addcomd 11177	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑋 + 𝐵) = (𝐵 + 𝑋))
88	87	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝐵) = (𝐵 + 𝑋))
89	85, 88	breqtrd 5100	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝑠) < (𝐵 + 𝑋))
90	75, 78, 54, 84, 89	eliood 43036	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝑋 + 𝑠) ∈ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)))
91		fvres 6793	. . . . . . . . 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 2744	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (𝐹‘(𝑋 + 𝑠)) = ((𝐹 ↾ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)))‘(𝑋 + 𝑠)))
94	93	mpteq2dva 5174	. . . . . 6 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ (𝐹‘(𝑋 + 𝑠))) = (𝑠 ∈ (𝐴(,)𝐵) ↦ ((𝐹 ↾ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)))‘(𝑋 + 𝑠))))
95		ioosscn 13141	. . . . . . . 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 13141	. . . . . . . 8 ⊢ (𝐴(,)𝐵) ⊆ ℂ
99	98	a1i 11	. . . . . . 7 ⊢ (𝜑 → (𝐴(,)𝐵) ⊆ ℂ)
100	96, 97, 99, 80, 90	fourierdlem23 43671	. . . . . 6 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ ((𝐹 ↾ ((𝐴 + 𝑋)(,)(𝐵 + 𝑋)))‘(𝑋 + 𝑠))) ∈ ((𝐴(,)𝐵)–cn→ℂ))
101	94, 100	eqeltrd 2839	. . . . 5 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ (𝐹‘(𝑋 + 𝑠))) ∈ ((𝐴(,)𝐵)–cn→ℂ))
102		0red 10978	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 0 ∈ ℝ)
103	14	ad2antrr 723	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 ∈ ℝ)
104	8	adantl 482	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ ℝ)
105		simplr 766	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 0 ≤ 𝐴)
106	27	adantlr 712	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐴 < 𝑠)
107	102, 103, 104, 105, 106	lelttrd 11133	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 0 < 𝑠)
108	107	iftrued 4467	. . . . . . . . 9 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → if(0 < 𝑠, 𝑌, 𝑊) = 𝑌)
109	108	negeqd 11215	. . . . . . . 8 ⊢ (((𝜑 ∧ 0 ≤ 𝐴) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -if(0 < 𝑠, 𝑌, 𝑊) = -𝑌)
110	109	mpteq2dva 5174	. . . . . . 7 ⊢ ((𝜑 ∧ 0 ≤ 𝐴) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -if(0 < 𝑠, 𝑌, 𝑊)) = (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑌))
111	56	renegcld 11402	. . . . . . . . . 10 ⊢ (𝜑 → -𝑌 ∈ ℝ)
112	111	recnd 11003	. . . . . . . . 9 ⊢ (𝜑 → -𝑌 ∈ ℂ)
113		ssid 3943	. . . . . . . . . 10 ⊢ ℂ ⊆ ℂ
114	113	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → ℂ ⊆ ℂ)
115	99, 112, 114	constcncfg 43413	. . . . . . . 8 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑌) ∈ ((𝐴(,)𝐵)–cn→ℂ))
116	115	adantr 481	. . . . . . 7 ⊢ ((𝜑 ∧ 0 ≤ 𝐴) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑌) ∈ ((𝐴(,)𝐵)–cn→ℂ))
117	110, 116	eqeltrd 2839	. . . . . 6 ⊢ ((𝜑 ∧ 0 ≤ 𝐴) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -if(0 < 𝑠, 𝑌, 𝑊)) ∈ ((𝐴(,)𝐵)–cn→ℂ))
118	14	rexrd 11025	. . . . . . . . . 10 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
119	118	ad2antrr 723	. . . . . . . . 9 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 𝐴 ∈ ℝ^*)
120	23	ad2antrr 723	. . . . . . . . 9 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 𝐵 ∈ ℝ^*)
121		0red 10978	. . . . . . . . 9 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 0 ∈ ℝ)
122		simpr 485	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → ¬ 0 ≤ 𝐴)
123	14	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → 𝐴 ∈ ℝ)
124		0red 10978	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → 0 ∈ ℝ)
125	123, 124	ltnled 11122	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → (𝐴 < 0 ↔ ¬ 0 ≤ 𝐴))
126	122, 125	mpbird 256	. . . . . . . . . 10 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → 𝐴 < 0)
127	126	adantr 481	. . . . . . . . 9 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 𝐴 < 0)
128		simpr 485	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 0) → ¬ 𝐵 ≤ 0)
129		0red 10978	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 0) → 0 ∈ ℝ)
130	22	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 0) → 𝐵 ∈ ℝ)
131	129, 130	ltnled 11122	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 0) → (0 < 𝐵 ↔ ¬ 𝐵 ≤ 0))
132	128, 131	mpbird 256	. . . . . . . . . 10 ⊢ ((𝜑 ∧ ¬ 𝐵 ≤ 0) → 0 < 𝐵)
133	132	adantlr 712	. . . . . . . . 9 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 0 < 𝐵)
134	119, 120, 121, 127, 133	eliood 43036	. . . . . . . 8 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → 0 ∈ (𝐴(,)𝐵))
135	46	ad2antrr 723	. . . . . . . 8 ⊢ (((𝜑 ∧ ¬ 0 ≤ 𝐴) ∧ ¬ 𝐵 ≤ 0) → ¬ 0 ∈ (𝐴(,)𝐵))
136	134, 135	condan 815	. . . . . . 7 ⊢ ((𝜑 ∧ ¬ 0 ≤ 𝐴) → 𝐵 ≤ 0)
137	8	adantl 482	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ ℝ)
138		0red 10978	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 0 ∈ ℝ)
139	22	ad2antrr 723	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐵 ∈ ℝ)
140	32	adantlr 712	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 < 𝐵)
141		simplr 766	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝐵 ≤ 0)
142	137, 139, 138, 140, 141	ltletrd 11135	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 < 0)
143	137, 138, 142	ltnsymd 11124	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ¬ 0 < 𝑠)
144	143	iffalsed 4470	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → if(0 < 𝑠, 𝑌, 𝑊) = 𝑊)
145	144	negeqd 11215	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝐵 ≤ 0) ∧ 𝑠 ∈ (𝐴(,)𝐵)) → -if(0 < 𝑠, 𝑌, 𝑊) = -𝑊)
146	145	mpteq2dva 5174	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐵 ≤ 0) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -if(0 < 𝑠, 𝑌, 𝑊)) = (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑊))
147	57	recnd 11003	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑊 ∈ ℂ)
148	147	negcld 11319	. . . . . . . . . 10 ⊢ (𝜑 → -𝑊 ∈ ℂ)
149	99, 148, 114	constcncfg 43413	. . . . . . . . 9 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑊) ∈ ((𝐴(,)𝐵)–cn→ℂ))
150	149	adantr 481	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐵 ≤ 0) → (𝑠 ∈ (𝐴(,)𝐵) ↦ -𝑊) ∈ ((𝐴(,)𝐵)–cn→ℂ))
151	146, 150	eqeltrd 2839	. . . . . . 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 810	. . . . 5 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ -if(0 < 𝑠, 𝑌, 𝑊)) ∈ ((𝐴(,)𝐵)–cn→ℂ))
154	101, 153	addcncf 24608	. . . 4 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ ((𝐹‘(𝑋 + 𝑠)) + -if(0 < 𝑠, 𝑌, 𝑊))) ∈ ((𝐴(,)𝐵)–cn→ℂ))
155	72, 154	eqeltrd 2839	. . 3 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ ((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊))) ∈ ((𝐴(,)𝐵)–cn→ℂ))
156		eqid 2738	. . . 4 ⊢ (𝑠 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑠)) = (𝑠 ∈ (ℂ ∖ {0}) ↦ (1 / 𝑠))
157		1cnd 10970	. . . . 5 ⊢ (𝜑 → 1 ∈ ℂ)
158	156	cdivcncf 24084	. . . . 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 4577	. . . . . . . 8 ⊢ (𝑠 ∈ {0} ↔ 𝑠 = 0)
161	48, 160	sylnibr 329	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → ¬ 𝑠 ∈ {0})
162	62, 161	eldifd 3898	. . . . . 6 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → 𝑠 ∈ (ℂ ∖ {0}))
163	162	ralrimiva 3103	. . . . 5 ⊢ (𝜑 → ∀𝑠 ∈ (𝐴(,)𝐵)𝑠 ∈ (ℂ ∖ {0}))
164		dfss3 3909	. . . . 5 ⊢ ((𝐴(,)𝐵) ⊆ (ℂ ∖ {0}) ↔ ∀𝑠 ∈ (𝐴(,)𝐵)𝑠 ∈ (ℂ ∖ {0}))
165	163, 164	sylibr 233	. . . 4 ⊢ (𝜑 → (𝐴(,)𝐵) ⊆ (ℂ ∖ {0}))
166	9, 63	rereccld 11802	. . . . 5 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (1 / 𝑠) ∈ ℝ)
167	166	recnd 11003	. . . 4 ⊢ ((𝜑 ∧ 𝑠 ∈ (𝐴(,)𝐵)) → (1 / 𝑠) ∈ ℂ)
168	156, 159, 165, 114, 167	cncfmptssg 43412	. . 3 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ (1 / 𝑠)) ∈ ((𝐴(,)𝐵)–cn→ℂ))
169	155, 168	mulcncf 24610	. 2 ⊢ (𝜑 → (𝑠 ∈ (𝐴(,)𝐵) ↦ (((𝐹‘(𝑋 + 𝑠)) − if(0 < 𝑠, 𝑌, 𝑊)) · (1 / 𝑠))) ∈ ((𝐴(,)𝐵)–cn→ℂ))
170	67, 169	eqeltrd 2839	1 ⊢ (𝜑 → (𝐻 ↾ (𝐴(,)𝐵)) ∈ ((𝐴(,)𝐵)–cn→ℂ))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 = wceq 1539 ∈ wcel 2106 ∀wral 3064 ∖ cdif 3884 ⊆ wss 3887 ifcif 4459 {csn 4561 class class class wbr 5074 ↦ cmpt 5157 ↾ cres 5591 ⟶wf 6429 ‘cfv 6433 (class class class)co 7275 ℂcc 10869 ℝcr 10870 0cc0 10871 1c1 10872 + caddc 10874 · cmul 10876 ℝ^*cxr 11008 < clt 11009 ≤ cle 11010 − cmin 11205 -cneg 11206 / cdiv 11632 (,)cioo 13079 [,]cicc 13082 πcpi 15776 –cn→ccncf 24039

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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-rep 5209 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-inf2 9399 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 ax-pre-sup 10949 ax-addf 10950 ax-mulf 10951

This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-tp 4566 df-op 4568 df-uni 4840 df-int 4880 df-iun 4926 df-iin 4927 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-se 5545 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-isom 6442 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-of 7533 df-om 7713 df-1st 7831 df-2nd 7832 df-supp 7978 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-1o 8297 df-2o 8298 df-er 8498 df-map 8617 df-pm 8618 df-ixp 8686 df-en 8734 df-dom 8735 df-sdom 8736 df-fin 8737 df-fsupp 9129 df-fi 9170 df-sup 9201 df-inf 9202 df-oi 9269 df-card 9697 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-div 11633 df-nn 11974 df-2 12036 df-3 12037 df-4 12038 df-5 12039 df-6 12040 df-7 12041 df-8 12042 df-9 12043 df-n0 12234 df-z 12320 df-dec 12438 df-uz 12583 df-q 12689 df-rp 12731 df-xneg 12848 df-xadd 12849 df-xmul 12850 df-ioo 13083 df-ioc 13084 df-ico 13085 df-icc 13086 df-fz 13240 df-fzo 13383 df-fl 13512 df-seq 13722 df-exp 13783 df-fac 13988 df-bc 14017 df-hash 14045 df-shft 14778 df-cj 14810 df-re 14811 df-im 14812 df-sqrt 14946 df-abs 14947 df-limsup 15180 df-clim 15197 df-rlim 15198 df-sum 15398 df-ef 15777 df-sin 15779 df-cos 15780 df-pi 15782 df-struct 16848 df-sets 16865 df-slot 16883 df-ndx 16895 df-base 16913 df-ress 16942 df-plusg 16975 df-mulr 16976 df-starv 16977 df-sca 16978 df-vsca 16979 df-ip 16980 df-tset 16981 df-ple 16982 df-ds 16984 df-unif 16985 df-hom 16986 df-cco 16987 df-rest 17133 df-topn 17134 df-0g 17152 df-gsum 17153 df-topgen 17154 df-pt 17155 df-prds 17158 df-xrs 17213 df-qtop 17218 df-imas 17219 df-xps 17221 df-mre 17295 df-mrc 17296 df-acs 17298 df-mgm 18326 df-sgrp 18375 df-mnd 18386 df-submnd 18431 df-mulg 18701 df-cntz 18923 df-cmn 19388 df-psmet 20589 df-xmet 20590 df-met 20591 df-bl 20592 df-mopn 20593 df-fbas 20594 df-fg 20595 df-cnfld 20598 df-top 22043 df-topon 22060 df-topsp 22082 df-bases 22096 df-cld 22170 df-ntr 22171 df-cls 22172 df-nei 22249 df-lp 22287 df-perf 22288 df-cn 22378 df-cnp 22379 df-haus 22466 df-tx 22713 df-hmeo 22906 df-fil 22997 df-fm 23089 df-flim 23090 df-flf 23091 df-xms 23473 df-ms 23474 df-tms 23475 df-cncf 24041 df-limc 25030 df-dv 25031

This theorem is referenced by: fourierdlem103 43750 fourierdlem104 43751

W3C validator