fourierdlem43 - Mathbox for Glauco Siliprandi

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Theorem fourierdlem43 45164

Description: 𝐾 is a real function. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypothesis**
Ref	Expression
fourierdlem43.1	⊢ 𝐾 = (𝑠 ∈ (-π[,]π) ↦ if(𝑠 = 0, 1, (𝑠 / (2 · (sin‘(𝑠 / 2))))))

**Assertion**
Ref	Expression
fourierdlem43	⊢ 𝐾:(-π[,]π)⟶ℝ

**Proof of Theorem fourierdlem43**
Step	Hyp	Ref	Expression
1		fourierdlem43.1	. 2 ⊢ 𝐾 = (𝑠 ∈ (-π[,]π) ↦ if(𝑠 = 0, 1, (𝑠 / (2 · (sin‘(𝑠 / 2))))))
2		1red 11219	. . 3 ⊢ ((𝑠 ∈ (-π[,]π) ∧ 𝑠 = 0) → 1 ∈ ℝ)
3		pire 26204	. . . . . . . 8 ⊢ π ∈ ℝ
4	3	a1i 11	. . . . . . 7 ⊢ (𝑠 ∈ (-π[,]π) → π ∈ ℝ)
5	4	renegcld 11645	. . . . . 6 ⊢ (𝑠 ∈ (-π[,]π) → -π ∈ ℝ)
6		id 22	. . . . . 6 ⊢ (𝑠 ∈ (-π[,]π) → 𝑠 ∈ (-π[,]π))
7		eliccre 44516	. . . . . 6 ⊢ ((-π ∈ ℝ ∧ π ∈ ℝ ∧ 𝑠 ∈ (-π[,]π)) → 𝑠 ∈ ℝ)
8	5, 4, 6, 7	syl3anc 1369	. . . . 5 ⊢ (𝑠 ∈ (-π[,]π) → 𝑠 ∈ ℝ)
9	8	adantr 479	. . . 4 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → 𝑠 ∈ ℝ)
10		2re 12290	. . . . . 6 ⊢ 2 ∈ ℝ
11	10	a1i 11	. . . . 5 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → 2 ∈ ℝ)
12	9	rehalfcld 12463	. . . . . 6 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → (𝑠 / 2) ∈ ℝ)
13	12	resincld 16090	. . . . 5 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → (sin‘(𝑠 / 2)) ∈ ℝ)
14	11, 13	remulcld 11248	. . . 4 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → (2 · (sin‘(𝑠 / 2))) ∈ ℝ)
15		2cnd 12294	. . . . 5 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → 2 ∈ ℂ)
16	13	recnd 11246	. . . . 5 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → (sin‘(𝑠 / 2)) ∈ ℂ)
17		2ne0 12320	. . . . . 6 ⊢ 2 ≠ 0
18	17	a1i 11	. . . . 5 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → 2 ≠ 0)
19		0xr 11265	. . . . . . . . . 10 ⊢ 0 ∈ ℝ^*
20	19	a1i 11	. . . . . . . . 9 ⊢ ((𝑠 ∈ (-π[,]π) ∧ 0 < 𝑠) → 0 ∈ ℝ^*)
21	10, 3	remulcli 11234	. . . . . . . . . . 11 ⊢ (2 · π) ∈ ℝ
22	21	rexri 11276	. . . . . . . . . 10 ⊢ (2 · π) ∈ ℝ^*
23	22	a1i 11	. . . . . . . . 9 ⊢ ((𝑠 ∈ (-π[,]π) ∧ 0 < 𝑠) → (2 · π) ∈ ℝ^*)
24	8	adantr 479	. . . . . . . . 9 ⊢ ((𝑠 ∈ (-π[,]π) ∧ 0 < 𝑠) → 𝑠 ∈ ℝ)
25		simpr 483	. . . . . . . . 9 ⊢ ((𝑠 ∈ (-π[,]π) ∧ 0 < 𝑠) → 0 < 𝑠)
26	21	a1i 11	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,]π) → (2 · π) ∈ ℝ)
27	5	rexrd 11268	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ (-π[,]π) → -π ∈ ℝ^*)
28	4	rexrd 11268	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ (-π[,]π) → π ∈ ℝ^*)
29		iccleub 13383	. . . . . . . . . . . 12 ⊢ ((-π ∈ ℝ^* ∧ π ∈ ℝ^* ∧ 𝑠 ∈ (-π[,]π)) → 𝑠 ≤ π)
30	27, 28, 6, 29	syl3anc 1369	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,]π) → 𝑠 ≤ π)
31		pirp 26207	. . . . . . . . . . . . 13 ⊢ π ∈ ℝ⁺
32		2timesgt 44296	. . . . . . . . . . . . 13 ⊢ (π ∈ ℝ⁺ → π < (2 · π))
33	31, 32	ax-mp 5	. . . . . . . . . . . 12 ⊢ π < (2 · π)
34	33	a1i 11	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,]π) → π < (2 · π))
35	8, 4, 26, 30, 34	lelttrd 11376	. . . . . . . . . 10 ⊢ (𝑠 ∈ (-π[,]π) → 𝑠 < (2 · π))
36	35	adantr 479	. . . . . . . . 9 ⊢ ((𝑠 ∈ (-π[,]π) ∧ 0 < 𝑠) → 𝑠 < (2 · π))
37	20, 23, 24, 25, 36	eliood 44509	. . . . . . . 8 ⊢ ((𝑠 ∈ (-π[,]π) ∧ 0 < 𝑠) → 𝑠 ∈ (0(,)(2 · π)))
38		sinaover2ne0 44882	. . . . . . . 8 ⊢ (𝑠 ∈ (0(,)(2 · π)) → (sin‘(𝑠 / 2)) ≠ 0)
39	37, 38	syl 17	. . . . . . 7 ⊢ ((𝑠 ∈ (-π[,]π) ∧ 0 < 𝑠) → (sin‘(𝑠 / 2)) ≠ 0)
40	39	adantlr 711	. . . . . 6 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ 0 < 𝑠) → (sin‘(𝑠 / 2)) ≠ 0)
41	8	ad2antrr 722	. . . . . . . 8 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ ¬ 0 < 𝑠) → 𝑠 ∈ ℝ)
42		iccgelb 13384	. . . . . . . . . 10 ⊢ ((-π ∈ ℝ^* ∧ π ∈ ℝ^* ∧ 𝑠 ∈ (-π[,]π)) → -π ≤ 𝑠)
43	27, 28, 6, 42	syl3anc 1369	. . . . . . . . 9 ⊢ (𝑠 ∈ (-π[,]π) → -π ≤ 𝑠)
44	43	ad2antrr 722	. . . . . . . 8 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ ¬ 0 < 𝑠) → -π ≤ 𝑠)
45		0red 11221	. . . . . . . . 9 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ ¬ 0 < 𝑠) → 0 ∈ ℝ)
46		neqne 2946	. . . . . . . . . 10 ⊢ (¬ 𝑠 = 0 → 𝑠 ≠ 0)
47	46	ad2antlr 723	. . . . . . . . 9 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ ¬ 0 < 𝑠) → 𝑠 ≠ 0)
48		simpr 483	. . . . . . . . 9 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ ¬ 0 < 𝑠) → ¬ 0 < 𝑠)
49	41, 45, 47, 48	lttri5d 44307	. . . . . . . 8 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ ¬ 0 < 𝑠) → 𝑠 < 0)
50	5	ad2antrr 722	. . . . . . . . 9 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ ¬ 0 < 𝑠) → -π ∈ ℝ)
51		elico2 13392	. . . . . . . . 9 ⊢ ((-π ∈ ℝ ∧ 0 ∈ ℝ^*) → (𝑠 ∈ (-π[,)0) ↔ (𝑠 ∈ ℝ ∧ -π ≤ 𝑠 ∧ 𝑠 < 0)))
52	50, 19, 51	sylancl 584	. . . . . . . 8 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ ¬ 0 < 𝑠) → (𝑠 ∈ (-π[,)0) ↔ (𝑠 ∈ ℝ ∧ -π ≤ 𝑠 ∧ 𝑠 < 0)))
53	41, 44, 49, 52	mpbir3and 1340	. . . . . . 7 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ ¬ 0 < 𝑠) → 𝑠 ∈ (-π[,)0))
54	3	renegcli 11525	. . . . . . . . . . . . . . 15 ⊢ -π ∈ ℝ
55		elicore 13380	. . . . . . . . . . . . . . 15 ⊢ ((-π ∈ ℝ ∧ 𝑠 ∈ (-π[,)0)) → 𝑠 ∈ ℝ)
56	54, 55	mpan 686	. . . . . . . . . . . . . 14 ⊢ (𝑠 ∈ (-π[,)0) → 𝑠 ∈ ℝ)
57	56	recnd 11246	. . . . . . . . . . . . 13 ⊢ (𝑠 ∈ (-π[,)0) → 𝑠 ∈ ℂ)
58		2cnd 12294	. . . . . . . . . . . . 13 ⊢ (𝑠 ∈ (-π[,)0) → 2 ∈ ℂ)
59	17	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝑠 ∈ (-π[,)0) → 2 ≠ 0)
60	57, 58, 59	divnegd 12007	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ (-π[,)0) → -(𝑠 / 2) = (-𝑠 / 2))
61	60	eqcomd 2736	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,)0) → (-𝑠 / 2) = -(𝑠 / 2))
62	61	fveq2d 6894	. . . . . . . . . 10 ⊢ (𝑠 ∈ (-π[,)0) → (sin‘(-𝑠 / 2)) = (sin‘-(𝑠 / 2)))
63	62	negeqd 11458	. . . . . . . . 9 ⊢ (𝑠 ∈ (-π[,)0) → -(sin‘(-𝑠 / 2)) = -(sin‘-(𝑠 / 2)))
64	57	halfcld 12461	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,)0) → (𝑠 / 2) ∈ ℂ)
65		sinneg 16093	. . . . . . . . . . 11 ⊢ ((𝑠 / 2) ∈ ℂ → (sin‘-(𝑠 / 2)) = -(sin‘(𝑠 / 2)))
66	64, 65	syl 17	. . . . . . . . . 10 ⊢ (𝑠 ∈ (-π[,)0) → (sin‘-(𝑠 / 2)) = -(sin‘(𝑠 / 2)))
67	66	negeqd 11458	. . . . . . . . 9 ⊢ (𝑠 ∈ (-π[,)0) → -(sin‘-(𝑠 / 2)) = --(sin‘(𝑠 / 2)))
68	64	sincld 16077	. . . . . . . . . 10 ⊢ (𝑠 ∈ (-π[,)0) → (sin‘(𝑠 / 2)) ∈ ℂ)
69	68	negnegd 11566	. . . . . . . . 9 ⊢ (𝑠 ∈ (-π[,)0) → --(sin‘(𝑠 / 2)) = (sin‘(𝑠 / 2)))
70	63, 67, 69	3eqtrd 2774	. . . . . . . 8 ⊢ (𝑠 ∈ (-π[,)0) → -(sin‘(-𝑠 / 2)) = (sin‘(𝑠 / 2)))
71	57	negcld 11562	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,)0) → -𝑠 ∈ ℂ)
72	71	halfcld 12461	. . . . . . . . . 10 ⊢ (𝑠 ∈ (-π[,)0) → (-𝑠 / 2) ∈ ℂ)
73	72	sincld 16077	. . . . . . . . 9 ⊢ (𝑠 ∈ (-π[,)0) → (sin‘(-𝑠 / 2)) ∈ ℂ)
74	19	a1i 11	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,)0) → 0 ∈ ℝ^*)
75	22	a1i 11	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,)0) → (2 · π) ∈ ℝ^*)
76	56	renegcld 11645	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,)0) → -𝑠 ∈ ℝ)
77	54	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝑠 ∈ (-π[,)0) → -π ∈ ℝ)
78	77	rexrd 11268	. . . . . . . . . . . . 13 ⊢ (𝑠 ∈ (-π[,)0) → -π ∈ ℝ^*)
79		id 22	. . . . . . . . . . . . 13 ⊢ (𝑠 ∈ (-π[,)0) → 𝑠 ∈ (-π[,)0))
80		icoltub 44519	. . . . . . . . . . . . 13 ⊢ ((-π ∈ ℝ^* ∧ 0 ∈ ℝ^* ∧ 𝑠 ∈ (-π[,)0)) → 𝑠 < 0)
81	78, 74, 79, 80	syl3anc 1369	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ (-π[,)0) → 𝑠 < 0)
82	56	lt0neg1d 11787	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ (-π[,)0) → (𝑠 < 0 ↔ 0 < -𝑠))
83	81, 82	mpbid 231	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,)0) → 0 < -𝑠)
84	3	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ (-π[,)0) → π ∈ ℝ)
85	21	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ (-π[,)0) → (2 · π) ∈ ℝ)
86		icogelb 13379	. . . . . . . . . . . . . 14 ⊢ ((-π ∈ ℝ^* ∧ 0 ∈ ℝ^* ∧ 𝑠 ∈ (-π[,)0)) → -π ≤ 𝑠)
87	78, 74, 79, 86	syl3anc 1369	. . . . . . . . . . . . 13 ⊢ (𝑠 ∈ (-π[,)0) → -π ≤ 𝑠)
88	84, 56, 87	lenegcon1d 11800	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ (-π[,)0) → -𝑠 ≤ π)
89	33	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑠 ∈ (-π[,)0) → π < (2 · π))
90	76, 84, 85, 88, 89	lelttrd 11376	. . . . . . . . . . 11 ⊢ (𝑠 ∈ (-π[,)0) → -𝑠 < (2 · π))
91	74, 75, 76, 83, 90	eliood 44509	. . . . . . . . . 10 ⊢ (𝑠 ∈ (-π[,)0) → -𝑠 ∈ (0(,)(2 · π)))
92		sinaover2ne0 44882	. . . . . . . . . 10 ⊢ (-𝑠 ∈ (0(,)(2 · π)) → (sin‘(-𝑠 / 2)) ≠ 0)
93	91, 92	syl 17	. . . . . . . . 9 ⊢ (𝑠 ∈ (-π[,)0) → (sin‘(-𝑠 / 2)) ≠ 0)
94	73, 93	negne0d 11573	. . . . . . . 8 ⊢ (𝑠 ∈ (-π[,)0) → -(sin‘(-𝑠 / 2)) ≠ 0)
95	70, 94	eqnetrrd 3007	. . . . . . 7 ⊢ (𝑠 ∈ (-π[,)0) → (sin‘(𝑠 / 2)) ≠ 0)
96	53, 95	syl 17	. . . . . 6 ⊢ (((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) ∧ ¬ 0 < 𝑠) → (sin‘(𝑠 / 2)) ≠ 0)
97	40, 96	pm2.61dan 809	. . . . 5 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → (sin‘(𝑠 / 2)) ≠ 0)
98	15, 16, 18, 97	mulne0d 11870	. . . 4 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → (2 · (sin‘(𝑠 / 2))) ≠ 0)
99	9, 14, 98	redivcld 12046	. . 3 ⊢ ((𝑠 ∈ (-π[,]π) ∧ ¬ 𝑠 = 0) → (𝑠 / (2 · (sin‘(𝑠 / 2)))) ∈ ℝ)
100	2, 99	ifclda 4562	. 2 ⊢ (𝑠 ∈ (-π[,]π) → if(𝑠 = 0, 1, (𝑠 / (2 · (sin‘(𝑠 / 2))))) ∈ ℝ)
101	1, 100	fmpti 7112	1 ⊢ 𝐾:(-π[,]π)⟶ℝ

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 ↔ wb 205 ∧ wa 394 ∧ w3a 1085 = wceq 1539 ∈ wcel 2104 ≠ wne 2938 ifcif 4527 class class class wbr 5147 ↦ cmpt 5230 ⟶wf 6538 ‘cfv 6542 (class class class)co 7411 ℂcc 11110 ℝcr 11111 0cc0 11112 1c1 11113 · cmul 11117 ℝ^*cxr 11251 < clt 11252 ≤ cle 11253 -cneg 11449 / cdiv 11875 2c2 12271 ℝ⁺crp 12978 (,)cioo 13328 [,)cico 13330 [,]cicc 13331 sincsin 16011 πcpi 16014

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 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7727 ax-inf2 9638 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190 ax-addf 11191

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3474 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-tp 4632 df-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-iin 4999 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-se 5631 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-isom 6551 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-of 7672 df-om 7858 df-1st 7977 df-2nd 7978 df-supp 8149 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-1o 8468 df-2o 8469 df-er 8705 df-map 8824 df-pm 8825 df-ixp 8894 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-fsupp 9364 df-fi 9408 df-sup 9439 df-inf 9440 df-oi 9507 df-card 9936 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 df-nn 12217 df-2 12279 df-3 12280 df-4 12281 df-5 12282 df-6 12283 df-7 12284 df-8 12285 df-9 12286 df-n0 12477 df-z 12563 df-dec 12682 df-uz 12827 df-q 12937 df-rp 12979 df-xneg 13096 df-xadd 13097 df-xmul 13098 df-ioo 13332 df-ioc 13333 df-ico 13334 df-icc 13335 df-fz 13489 df-fzo 13632 df-fl 13761 df-mod 13839 df-seq 13971 df-exp 14032 df-fac 14238 df-bc 14267 df-hash 14295 df-shft 15018 df-cj 15050 df-re 15051 df-im 15052 df-sqrt 15186 df-abs 15187 df-limsup 15419 df-clim 15436 df-rlim 15437 df-sum 15637 df-ef 16015 df-sin 16017 df-cos 16018 df-pi 16020 df-struct 17084 df-sets 17101 df-slot 17119 df-ndx 17131 df-base 17149 df-ress 17178 df-plusg 17214 df-mulr 17215 df-starv 17216 df-sca 17217 df-vsca 17218 df-ip 17219 df-tset 17220 df-ple 17221 df-ds 17223 df-unif 17224 df-hom 17225 df-cco 17226 df-rest 17372 df-topn 17373 df-0g 17391 df-gsum 17392 df-topgen 17393 df-pt 17394 df-prds 17397 df-xrs 17452 df-qtop 17457 df-imas 17458 df-xps 17460 df-mre 17534 df-mrc 17535 df-acs 17537 df-mgm 18565 df-sgrp 18644 df-mnd 18660 df-submnd 18706 df-mulg 18987 df-cntz 19222 df-cmn 19691 df-psmet 21136 df-xmet 21137 df-met 21138 df-bl 21139 df-mopn 21140 df-fbas 21141 df-fg 21142 df-cnfld 21145 df-top 22616 df-topon 22633 df-topsp 22655 df-bases 22669 df-cld 22743 df-ntr 22744 df-cls 22745 df-nei 22822 df-lp 22860 df-perf 22861 df-cn 22951 df-cnp 22952 df-haus 23039 df-tx 23286 df-hmeo 23479 df-fil 23570 df-fm 23662 df-flim 23663 df-flf 23664 df-xms 24046 df-ms 24047 df-tms 24048 df-cncf 24618 df-limc 25615 df-dv 25616

This theorem is referenced by: fourierdlem55 45175 fourierdlem62 45182 fourierdlem66 45186 fourierdlem77 45197 fourierdlem85 45205 fourierdlem88 45208 fourierdlem103 45223 fourierdlem104 45224

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