sineq0 - Metamath Proof Explorer

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Theorem sineq0 26024

Description: A complex number whose sine is zero is an integer multiple of π. (Contributed by NM, 17-Aug-2008.) (Revised by Mario Carneiro, 10-May-2014.)

**Assertion**
Ref	Expression
sineq0	⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 ↔ (𝐴 / π) ∈ ℤ))

**Proof of Theorem sineq0**
Step	Hyp	Ref	Expression
1		sinval 16061	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → (sin‘𝐴) = (((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) / (2 · i)))
2	1	eqeq1d 2734	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 ↔ (((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) / (2 · i)) = 0))
3		ax-icn 11165	. . . . . . . . . . . . . . . . . . . 20 ⊢ i ∈ ℂ
4		mulcl 11190	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · 𝐴) ∈ ℂ)
5	3, 4	mpan 688	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (i · 𝐴) ∈ ℂ)
6		efcl 16022	. . . . . . . . . . . . . . . . . . 19 ⊢ ((i · 𝐴) ∈ ℂ → (exp‘(i · 𝐴)) ∈ ℂ)
7	5, 6	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐴 ∈ ℂ → (exp‘(i · 𝐴)) ∈ ℂ)
8		negicn 11457	. . . . . . . . . . . . . . . . . . . 20 ⊢ -i ∈ ℂ
9		mulcl 11190	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((-i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (-i · 𝐴) ∈ ℂ)
10	8, 9	mpan 688	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (-i · 𝐴) ∈ ℂ)
11		efcl 16022	. . . . . . . . . . . . . . . . . . 19 ⊢ ((-i · 𝐴) ∈ ℂ → (exp‘(-i · 𝐴)) ∈ ℂ)
12	10, 11	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐴 ∈ ℂ → (exp‘(-i · 𝐴)) ∈ ℂ)
13	7, 12	subcld 11567	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → ((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) ∈ ℂ)
14		2mulicn 12431	. . . . . . . . . . . . . . . . . 18 ⊢ (2 · i) ∈ ℂ
15		2muline0 12432	. . . . . . . . . . . . . . . . . 18 ⊢ (2 · i) ≠ 0
16		diveq0 11878	. . . . . . . . . . . . . . . . . 18 ⊢ ((((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) ∈ ℂ ∧ (2 · i) ∈ ℂ ∧ (2 · i) ≠ 0) → ((((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) / (2 · i)) = 0 ↔ ((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) = 0))
17	14, 15, 16	mp3an23 1453	. . . . . . . . . . . . . . . . 17 ⊢ (((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) ∈ ℂ → ((((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) / (2 · i)) = 0 ↔ ((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) = 0))
18	13, 17	syl 17	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → ((((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) / (2 · i)) = 0 ↔ ((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) = 0))
19	7, 12	subeq0ad 11577	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → (((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) = 0 ↔ (exp‘(i · 𝐴)) = (exp‘(-i · 𝐴))))
20	2, 18, 19	3bitrd 304	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 ↔ (exp‘(i · 𝐴)) = (exp‘(-i · 𝐴))))
21		oveq2 7413	. . . . . . . . . . . . . . . 16 ⊢ ((exp‘(i · 𝐴)) = (exp‘(-i · 𝐴)) → ((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))))
22		2cn 12283	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ 2 ∈ ℂ
23		mul12 11375	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((i ∈ ℂ ∧ 2 ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · (2 · 𝐴)) = (2 · (i · 𝐴)))
24	3, 22, 23	mp3an12 1451	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝐴 ∈ ℂ → (i · (2 · 𝐴)) = (2 · (i · 𝐴)))
25	5	2timesd 12451	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝐴 ∈ ℂ → (2 · (i · 𝐴)) = ((i · 𝐴) + (i · 𝐴)))
26	24, 25	eqtrd 2772	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝐴 ∈ ℂ → (i · (2 · 𝐴)) = ((i · 𝐴) + (i · 𝐴)))
27	26	fveq2d 6892	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (exp‘(i · (2 · 𝐴))) = (exp‘((i · 𝐴) + (i · 𝐴))))
28		efadd 16033	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((i · 𝐴) ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (exp‘((i · 𝐴) + (i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))))
29	5, 5, 28	syl2anc 584	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (exp‘((i · 𝐴) + (i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))))
30	27, 29	eqtr2d 2773	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐴 ∈ ℂ → ((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))) = (exp‘(i · (2 · 𝐴))))
31		efadd 16033	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((i · 𝐴) ∈ ℂ ∧ (-i · 𝐴) ∈ ℂ) → (exp‘((i · 𝐴) + (-i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))))
32	5, 10, 31	syl2anc 584	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (exp‘((i · 𝐴) + (-i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))))
33	3	negidi 11525	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (i + -i) = 0
34	33	oveq1i 7415	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((i + -i) · 𝐴) = (0 · 𝐴)
35		adddir 11201	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((i ∈ ℂ ∧ -i ∈ ℂ ∧ 𝐴 ∈ ℂ) → ((i + -i) · 𝐴) = ((i · 𝐴) + (-i · 𝐴)))
36	3, 8, 35	mp3an12 1451	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝐴 ∈ ℂ → ((i + -i) · 𝐴) = ((i · 𝐴) + (-i · 𝐴)))
37		mul02 11388	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝐴 ∈ ℂ → (0 · 𝐴) = 0)
38	34, 36, 37	3eqtr3a 2796	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝐴 ∈ ℂ → ((i · 𝐴) + (-i · 𝐴)) = 0)
39	38	fveq2d 6892	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝐴 ∈ ℂ → (exp‘((i · 𝐴) + (-i · 𝐴))) = (exp‘0))
40		ef0 16030	. . . . . . . . . . . . . . . . . . . 20 ⊢ (exp‘0) = 1
41	39, 40	eqtrdi 2788	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (exp‘((i · 𝐴) + (-i · 𝐴))) = 1)
42	32, 41	eqtr3d 2774	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐴 ∈ ℂ → ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))) = 1)
43	30, 42	eqeq12d 2748	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → (((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))) ↔ (exp‘(i · (2 · 𝐴))) = 1))
44		fveq2 6888	. . . . . . . . . . . . . . . . 17 ⊢ ((exp‘(i · (2 · 𝐴))) = 1 → (abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1))
45	43, 44	syl6bi 252	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → (((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))) → (abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1)))
46	21, 45	syl5 34	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → ((exp‘(i · 𝐴)) = (exp‘(-i · 𝐴)) → (abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1)))
47	20, 46	sylbid 239	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 → (abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1)))
48		abs1 15240	. . . . . . . . . . . . . . . 16 ⊢ (abs‘1) = 1
49	48	eqeq2i 2745	. . . . . . . . . . . . . . 15 ⊢ ((abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1) ↔ (abs‘(exp‘(i · (2 · 𝐴)))) = 1)
50		2re 12282	. . . . . . . . . . . . . . . . 17 ⊢ 2 ∈ ℝ
51		2ne0 12312	. . . . . . . . . . . . . . . . 17 ⊢ 2 ≠ 0
52		mulre 15064	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐴 ∈ ℂ ∧ 2 ∈ ℝ ∧ 2 ≠ 0) → (𝐴 ∈ ℝ ↔ (2 · 𝐴) ∈ ℝ))
53	50, 51, 52	mp3an23 1453	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → (𝐴 ∈ ℝ ↔ (2 · 𝐴) ∈ ℝ))
54		mulcl 11190	. . . . . . . . . . . . . . . . . 18 ⊢ ((2 ∈ ℂ ∧ 𝐴 ∈ ℂ) → (2 · 𝐴) ∈ ℂ)
55	22, 54	mpan 688	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → (2 · 𝐴) ∈ ℂ)
56		absefib 16137	. . . . . . . . . . . . . . . . 17 ⊢ ((2 · 𝐴) ∈ ℂ → ((2 · 𝐴) ∈ ℝ ↔ (abs‘(exp‘(i · (2 · 𝐴)))) = 1))
57	55, 56	syl 17	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → ((2 · 𝐴) ∈ ℝ ↔ (abs‘(exp‘(i · (2 · 𝐴)))) = 1))
58	53, 57	bitr2d 279	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → ((abs‘(exp‘(i · (2 · 𝐴)))) = 1 ↔ 𝐴 ∈ ℝ))
59	49, 58	bitrid 282	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ ℂ → ((abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1) ↔ 𝐴 ∈ ℝ))
60	47, 59	sylibd 238	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 → 𝐴 ∈ ℝ))
61	60	imp 407	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → 𝐴 ∈ ℝ)
62		pirp 25962	. . . . . . . . . . . 12 ⊢ π ∈ ℝ⁺
63		modval 13832	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ⁺) → (𝐴 mod π) = (𝐴 − (π · (⌊‘(𝐴 / π)))))
64	61, 62, 63	sylancl 586	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 mod π) = (𝐴 − (π · (⌊‘(𝐴 / π)))))
65		picn 25960	. . . . . . . . . . . . 13 ⊢ π ∈ ℂ
66		pire 25959	. . . . . . . . . . . . . . . . 17 ⊢ π ∈ ℝ
67		pipos 25961	. . . . . . . . . . . . . . . . . 18 ⊢ 0 < π
68	66, 67	gt0ne0ii 11746	. . . . . . . . . . . . . . . . 17 ⊢ π ≠ 0
69		redivcl 11929	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ ∧ π ≠ 0) → (𝐴 / π) ∈ ℝ)
70	66, 68, 69	mp3an23 1453	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℝ → (𝐴 / π) ∈ ℝ)
71	61, 70	syl 17	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 / π) ∈ ℝ)
72	71	flcld 13759	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (⌊‘(𝐴 / π)) ∈ ℤ)
73	72	zcnd 12663	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (⌊‘(𝐴 / π)) ∈ ℂ)
74		mulcl 11190	. . . . . . . . . . . . 13 ⊢ ((π ∈ ℂ ∧ (⌊‘(𝐴 / π)) ∈ ℂ) → (π · (⌊‘(𝐴 / π))) ∈ ℂ)
75	65, 73, 74	sylancr 587	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (π · (⌊‘(𝐴 / π))) ∈ ℂ)
76		negsub 11504	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (π · (⌊‘(𝐴 / π))) ∈ ℂ) → (𝐴 + -(π · (⌊‘(𝐴 / π)))) = (𝐴 − (π · (⌊‘(𝐴 / π)))))
77	75, 76	syldan 591	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 + -(π · (⌊‘(𝐴 / π)))) = (𝐴 − (π · (⌊‘(𝐴 / π)))))
78		mulcom 11192	. . . . . . . . . . . . . . 15 ⊢ ((π ∈ ℂ ∧ (⌊‘(𝐴 / π)) ∈ ℂ) → (π · (⌊‘(𝐴 / π))) = ((⌊‘(𝐴 / π)) · π))
79	65, 73, 78	sylancr 587	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (π · (⌊‘(𝐴 / π))) = ((⌊‘(𝐴 / π)) · π))
80	79	negeqd 11450	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → -(π · (⌊‘(𝐴 / π))) = -((⌊‘(𝐴 / π)) · π))
81		mulneg1 11646	. . . . . . . . . . . . . 14 ⊢ (((⌊‘(𝐴 / π)) ∈ ℂ ∧ π ∈ ℂ) → (-(⌊‘(𝐴 / π)) · π) = -((⌊‘(𝐴 / π)) · π))
82	73, 65, 81	sylancl 586	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (-(⌊‘(𝐴 / π)) · π) = -((⌊‘(𝐴 / π)) · π))
83	80, 82	eqtr4d 2775	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → -(π · (⌊‘(𝐴 / π))) = (-(⌊‘(𝐴 / π)) · π))
84	83	oveq2d 7421	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 + -(π · (⌊‘(𝐴 / π)))) = (𝐴 + (-(⌊‘(𝐴 / π)) · π)))
85	64, 77, 84	3eqtr2d 2778	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 mod π) = (𝐴 + (-(⌊‘(𝐴 / π)) · π)))
86	85	fveq2d 6892	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (sin‘(𝐴 mod π)) = (sin‘(𝐴 + (-(⌊‘(𝐴 / π)) · π))))
87	86	fveq2d 6892	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (abs‘(sin‘(𝐴 mod π))) = (abs‘(sin‘(𝐴 + (-(⌊‘(𝐴 / π)) · π)))))
88	72	znegcld 12664	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → -(⌊‘(𝐴 / π)) ∈ ℤ)
89		abssinper 26021	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ -(⌊‘(𝐴 / π)) ∈ ℤ) → (abs‘(sin‘(𝐴 + (-(⌊‘(𝐴 / π)) · π)))) = (abs‘(sin‘𝐴)))
90	88, 89	syldan 591	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (abs‘(sin‘(𝐴 + (-(⌊‘(𝐴 / π)) · π)))) = (abs‘(sin‘𝐴)))
91		simpr 485	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (sin‘𝐴) = 0)
92	91	fveq2d 6892	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (abs‘(sin‘𝐴)) = (abs‘0))
93	87, 90, 92	3eqtrd 2776	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (abs‘(sin‘(𝐴 mod π))) = (abs‘0))
94		abs0 15228	. . . . . . 7 ⊢ (abs‘0) = 0
95	93, 94	eqtrdi 2788	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (abs‘(sin‘(𝐴 mod π))) = 0)
96		modcl 13834	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ⁺) → (𝐴 mod π) ∈ ℝ)
97	61, 62, 96	sylancl 586	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 mod π) ∈ ℝ)
98		modlt 13841	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ⁺) → (𝐴 mod π) < π)
99	61, 62, 98	sylancl 586	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 mod π) < π)
100	97, 99	jca 512	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → ((𝐴 mod π) ∈ ℝ ∧ (𝐴 mod π) < π))
101	100	biantrurd 533	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 < (𝐴 mod π) ↔ (((𝐴 mod π) ∈ ℝ ∧ (𝐴 mod π) < π) ∧ 0 < (𝐴 mod π))))
102		0re 11212	. . . . . . . . . . . 12 ⊢ 0 ∈ ℝ
103		rexr 11256	. . . . . . . . . . . . 13 ⊢ (0 ∈ ℝ → 0 ∈ ℝ^*)
104		rexr 11256	. . . . . . . . . . . . 13 ⊢ (π ∈ ℝ → π ∈ ℝ^*)
105		elioo2 13361	. . . . . . . . . . . . 13 ⊢ ((0 ∈ ℝ^* ∧ π ∈ ℝ^*) → ((𝐴 mod π) ∈ (0(,)π) ↔ ((𝐴 mod π) ∈ ℝ ∧ 0 < (𝐴 mod π) ∧ (𝐴 mod π) < π)))
106	103, 104, 105	syl2an 596	. . . . . . . . . . . 12 ⊢ ((0 ∈ ℝ ∧ π ∈ ℝ) → ((𝐴 mod π) ∈ (0(,)π) ↔ ((𝐴 mod π) ∈ ℝ ∧ 0 < (𝐴 mod π) ∧ (𝐴 mod π) < π)))
107	102, 66, 106	mp2an 690	. . . . . . . . . . 11 ⊢ ((𝐴 mod π) ∈ (0(,)π) ↔ ((𝐴 mod π) ∈ ℝ ∧ 0 < (𝐴 mod π) ∧ (𝐴 mod π) < π))
108		3anan32 1097	. . . . . . . . . . 11 ⊢ (((𝐴 mod π) ∈ ℝ ∧ 0 < (𝐴 mod π) ∧ (𝐴 mod π) < π) ↔ (((𝐴 mod π) ∈ ℝ ∧ (𝐴 mod π) < π) ∧ 0 < (𝐴 mod π)))
109	107, 108	bitri 274	. . . . . . . . . 10 ⊢ ((𝐴 mod π) ∈ (0(,)π) ↔ (((𝐴 mod π) ∈ ℝ ∧ (𝐴 mod π) < π) ∧ 0 < (𝐴 mod π)))
110	101, 109	bitr4di 288	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 < (𝐴 mod π) ↔ (𝐴 mod π) ∈ (0(,)π)))
111		sinq12gt0 26008	. . . . . . . . . 10 ⊢ ((𝐴 mod π) ∈ (0(,)π) → 0 < (sin‘(𝐴 mod π)))
112		elioore 13350	. . . . . . . . . . . 12 ⊢ ((𝐴 mod π) ∈ (0(,)π) → (𝐴 mod π) ∈ ℝ)
113	112	resincld 16082	. . . . . . . . . . 11 ⊢ ((𝐴 mod π) ∈ (0(,)π) → (sin‘(𝐴 mod π)) ∈ ℝ)
114		ltle 11298	. . . . . . . . . . . . 13 ⊢ ((0 ∈ ℝ ∧ (sin‘(𝐴 mod π)) ∈ ℝ) → (0 < (sin‘(𝐴 mod π)) → 0 ≤ (sin‘(𝐴 mod π))))
115	102, 113, 114	sylancr 587	. . . . . . . . . . . 12 ⊢ ((𝐴 mod π) ∈ (0(,)π) → (0 < (sin‘(𝐴 mod π)) → 0 ≤ (sin‘(𝐴 mod π))))
116	111, 115	mpd 15	. . . . . . . . . . 11 ⊢ ((𝐴 mod π) ∈ (0(,)π) → 0 ≤ (sin‘(𝐴 mod π)))
117	113, 116	absidd 15365	. . . . . . . . . 10 ⊢ ((𝐴 mod π) ∈ (0(,)π) → (abs‘(sin‘(𝐴 mod π))) = (sin‘(𝐴 mod π)))
118	111, 117	breqtrrd 5175	. . . . . . . . 9 ⊢ ((𝐴 mod π) ∈ (0(,)π) → 0 < (abs‘(sin‘(𝐴 mod π))))
119	110, 118	syl6bi 252	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 < (𝐴 mod π) → 0 < (abs‘(sin‘(𝐴 mod π)))))
120		ltne 11307	. . . . . . . . 9 ⊢ ((0 ∈ ℝ ∧ 0 < (abs‘(sin‘(𝐴 mod π)))) → (abs‘(sin‘(𝐴 mod π))) ≠ 0)
121	102, 120	mpan 688	. . . . . . . 8 ⊢ (0 < (abs‘(sin‘(𝐴 mod π))) → (abs‘(sin‘(𝐴 mod π))) ≠ 0)
122	119, 121	syl6 35	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 < (𝐴 mod π) → (abs‘(sin‘(𝐴 mod π))) ≠ 0))
123	122	necon2bd 2956	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → ((abs‘(sin‘(𝐴 mod π))) = 0 → ¬ 0 < (𝐴 mod π)))
124	95, 123	mpd 15	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → ¬ 0 < (𝐴 mod π))
125		modge0 13840	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ⁺) → 0 ≤ (𝐴 mod π))
126	61, 62, 125	sylancl 586	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → 0 ≤ (𝐴 mod π))
127		leloe 11296	. . . . . . . 8 ⊢ ((0 ∈ ℝ ∧ (𝐴 mod π) ∈ ℝ) → (0 ≤ (𝐴 mod π) ↔ (0 < (𝐴 mod π) ∨ 0 = (𝐴 mod π))))
128	102, 97, 127	sylancr 587	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 ≤ (𝐴 mod π) ↔ (0 < (𝐴 mod π) ∨ 0 = (𝐴 mod π))))
129	126, 128	mpbid 231	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 < (𝐴 mod π) ∨ 0 = (𝐴 mod π)))
130	129	ord 862	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (¬ 0 < (𝐴 mod π) → 0 = (𝐴 mod π)))
131	124, 130	mpd 15	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → 0 = (𝐴 mod π))
132	131	eqcomd 2738	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 mod π) = 0)
133		mod0 13837	. . . 4 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ⁺) → ((𝐴 mod π) = 0 ↔ (𝐴 / π) ∈ ℤ))
134	61, 62, 133	sylancl 586	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → ((𝐴 mod π) = 0 ↔ (𝐴 / π) ∈ ℤ))
135	132, 134	mpbid 231	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 / π) ∈ ℤ)
136		divcan1 11877	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ π ∈ ℂ ∧ π ≠ 0) → ((𝐴 / π) · π) = 𝐴)
137	65, 68, 136	mp3an23 1453	. . . 4 ⊢ (𝐴 ∈ ℂ → ((𝐴 / π) · π) = 𝐴)
138	137	fveq2d 6892	. . 3 ⊢ (𝐴 ∈ ℂ → (sin‘((𝐴 / π) · π)) = (sin‘𝐴))
139		sinkpi 26022	. . 3 ⊢ ((𝐴 / π) ∈ ℤ → (sin‘((𝐴 / π) · π)) = 0)
140	138, 139	sylan9req 2793	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (𝐴 / π) ∈ ℤ) → (sin‘𝐴) = 0)
141	135, 140	impbida 799	1 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 ↔ (𝐴 / π) ∈ ℤ))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 396 ∨ wo 845 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 class class class wbr 5147 ‘cfv 6540 (class class class)co 7405 ℂcc 11104 ℝcr 11105 0cc0 11106 1c1 11107 ici 11108 + caddc 11109 · cmul 11111 ℝ^*cxr 11243 < clt 11244 ≤ cle 11245 − cmin 11440 -cneg 11441 / cdiv 11867 2c2 12263 ℤcz 12554 ℝ⁺crp 12970 (,)cioo 13320 ⌊cfl 13751 mod cmo 13830 abscabs 15177 expce 16001 sincsin 16003 πcpi 16006

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 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 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 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 ax-mulf 11186

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 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 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-isom 6549 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-of 7666 df-om 7852 df-1st 7971 df-2nd 7972 df-supp 8143 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-2o 8463 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 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-5 12274 df-6 12275 df-7 12276 df-8 12277 df-9 12278 df-n0 12469 df-z 12555 df-dec 12674 df-uz 12819 df-q 12929 df-rp 12971 df-xneg 13088 df-xadd 13089 df-xmul 13090 df-ioo 13324 df-ioc 13325 df-ico 13326 df-icc 13327 df-fz 13481 df-fzo 13624 df-fl 13753 df-mod 13831 df-seq 13963 df-exp 14024 df-fac 14230 df-bc 14259 df-hash 14287 df-shft 15010 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179 df-limsup 15411 df-clim 15428 df-rlim 15429 df-sum 15629 df-ef 16007 df-sin 16009 df-cos 16010 df-pi 16012 df-struct 17076 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ress 17170 df-plusg 17206 df-mulr 17207 df-starv 17208 df-sca 17209 df-vsca 17210 df-ip 17211 df-tset 17212 df-ple 17213 df-ds 17215 df-unif 17216 df-hom 17217 df-cco 17218 df-rest 17364 df-topn 17365 df-0g 17383 df-gsum 17384 df-topgen 17385 df-pt 17386 df-prds 17389 df-xrs 17444 df-qtop 17449 df-imas 17450 df-xps 17452 df-mre 17526 df-mrc 17527 df-acs 17529 df-mgm 18557 df-sgrp 18606 df-mnd 18622 df-submnd 18668 df-mulg 18945 df-cntz 19175 df-cmn 19644 df-psmet 20928 df-xmet 20929 df-met 20930 df-bl 20931 df-mopn 20932 df-fbas 20933 df-fg 20934 df-cnfld 20937 df-top 22387 df-topon 22404 df-topsp 22426 df-bases 22440 df-cld 22514 df-ntr 22515 df-cls 22516 df-nei 22593 df-lp 22631 df-perf 22632 df-cn 22722 df-cnp 22723 df-haus 22810 df-tx 23057 df-hmeo 23250 df-fil 23341 df-fm 23433 df-flim 23434 df-flf 23435 df-xms 23817 df-ms 23818 df-tms 23819 df-cncf 24385 df-limc 25374 df-dv 25375

This theorem is referenced by: coseq1 26025 efeq1 26028 cosne0 26029 logf1o2 26149 coseq0 44566 sinaover2ne0 44570 dirker2re 44794 dirkerdenne0 44795 dirkertrigeqlem3 44802 dirkertrigeq 44803 dirkercncflem1 44805 dirkercncflem2 44806 dirkercncflem4 44808 fourierdlem103 44911 fourierdlem104 44912

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