sinaover2ne0 - Mathbox for Glauco Siliprandi

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Theorem sinaover2ne0 45869

Description: If 𝐴 in (0, 2π) then sin(𝐴 / 2) is not 0. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Assertion**
Ref	Expression
sinaover2ne0	⊢ (𝐴 ∈ (0(,)(2 · π)) → (sin‘(𝐴 / 2)) ≠ 0)

**Proof of Theorem sinaover2ne0**
Step	Hyp	Ref	Expression
1		elioore 13278	. . . . . 6 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 𝐴 ∈ ℝ)
2	1	recnd 11143	. . . . 5 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 𝐴 ∈ ℂ)
3		2cnd 12206	. . . . 5 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 2 ∈ ℂ)
4		picn 26365	. . . . . 6 ⊢ π ∈ ℂ
5	4	a1i 11	. . . . 5 ⊢ (𝐴 ∈ (0(,)(2 · π)) → π ∈ ℂ)
6		2ne0 12232	. . . . . 6 ⊢ 2 ≠ 0
7	6	a1i 11	. . . . 5 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 2 ≠ 0)
8		pire 26364	. . . . . . 7 ⊢ π ∈ ℝ
9		pipos 26366	. . . . . . 7 ⊢ 0 < π
10	8, 9	gt0ne0ii 11656	. . . . . 6 ⊢ π ≠ 0
11	10	a1i 11	. . . . 5 ⊢ (𝐴 ∈ (0(,)(2 · π)) → π ≠ 0)
12	2, 3, 5, 7, 11	divdiv1d 11931	. . . 4 ⊢ (𝐴 ∈ (0(,)(2 · π)) → ((𝐴 / 2) / π) = (𝐴 / (2 · π)))
13		0zd 12483	. . . . 5 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 0 ∈ ℤ)
14		2re 12202	. . . . . . . 8 ⊢ 2 ∈ ℝ
15	14, 8	remulcli 11131	. . . . . . 7 ⊢ (2 · π) ∈ ℝ
16	15	a1i 11	. . . . . 6 ⊢ (𝐴 ∈ (0(,)(2 · π)) → (2 · π) ∈ ℝ)
17		0xr 11162	. . . . . . . 8 ⊢ 0 ∈ ℝ^*
18	17	a1i 11	. . . . . . 7 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 0 ∈ ℝ^*)
19	16	rexrd 11165	. . . . . . 7 ⊢ (𝐴 ∈ (0(,)(2 · π)) → (2 · π) ∈ ℝ^*)
20		id 22	. . . . . . 7 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 𝐴 ∈ (0(,)(2 · π)))
21		ioogtlb 45496	. . . . . . 7 ⊢ ((0 ∈ ℝ^* ∧ (2 · π) ∈ ℝ^* ∧ 𝐴 ∈ (0(,)(2 · π))) → 0 < 𝐴)
22	18, 19, 20, 21	syl3anc 1373	. . . . . 6 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 0 < 𝐴)
23		2pos 12231	. . . . . . . 8 ⊢ 0 < 2
24	14, 8, 23, 9	mulgt0ii 11249	. . . . . . 7 ⊢ 0 < (2 · π)
25	24	a1i 11	. . . . . 6 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 0 < (2 · π))
26	1, 16, 22, 25	divgt0d 12060	. . . . 5 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 0 < (𝐴 / (2 · π)))
27		1rp 12897	. . . . . . . 8 ⊢ 1 ∈ ℝ⁺
28	27	a1i 11	. . . . . . 7 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 1 ∈ ℝ⁺)
29	16, 25	elrpd 12934	. . . . . . 7 ⊢ (𝐴 ∈ (0(,)(2 · π)) → (2 · π) ∈ ℝ⁺)
30	2	div1d 11892	. . . . . . . 8 ⊢ (𝐴 ∈ (0(,)(2 · π)) → (𝐴 / 1) = 𝐴)
31		iooltub 45511	. . . . . . . . 9 ⊢ ((0 ∈ ℝ^* ∧ (2 · π) ∈ ℝ^* ∧ 𝐴 ∈ (0(,)(2 · π))) → 𝐴 < (2 · π))
32	18, 19, 20, 31	syl3anc 1373	. . . . . . . 8 ⊢ (𝐴 ∈ (0(,)(2 · π)) → 𝐴 < (2 · π))
33	30, 32	eqbrtrd 5114	. . . . . . 7 ⊢ (𝐴 ∈ (0(,)(2 · π)) → (𝐴 / 1) < (2 · π))
34	1, 28, 29, 33	ltdiv23d 13004	. . . . . 6 ⊢ (𝐴 ∈ (0(,)(2 · π)) → (𝐴 / (2 · π)) < 1)
35		1e0p1 12633	. . . . . 6 ⊢ 1 = (0 + 1)
36	34, 35	breqtrdi 5133	. . . . 5 ⊢ (𝐴 ∈ (0(,)(2 · π)) → (𝐴 / (2 · π)) < (0 + 1))
37		btwnnz 12552	. . . . 5 ⊢ ((0 ∈ ℤ ∧ 0 < (𝐴 / (2 · π)) ∧ (𝐴 / (2 · π)) < (0 + 1)) → ¬ (𝐴 / (2 · π)) ∈ ℤ)
38	13, 26, 36, 37	syl3anc 1373	. . . 4 ⊢ (𝐴 ∈ (0(,)(2 · π)) → ¬ (𝐴 / (2 · π)) ∈ ℤ)
39	12, 38	eqneltrd 2848	. . 3 ⊢ (𝐴 ∈ (0(,)(2 · π)) → ¬ ((𝐴 / 2) / π) ∈ ℤ)
40	2	halfcld 12369	. . . 4 ⊢ (𝐴 ∈ (0(,)(2 · π)) → (𝐴 / 2) ∈ ℂ)
41		sineq0 26431	. . . 4 ⊢ ((𝐴 / 2) ∈ ℂ → ((sin‘(𝐴 / 2)) = 0 ↔ ((𝐴 / 2) / π) ∈ ℤ))
42	40, 41	syl 17	. . 3 ⊢ (𝐴 ∈ (0(,)(2 · π)) → ((sin‘(𝐴 / 2)) = 0 ↔ ((𝐴 / 2) / π) ∈ ℤ))
43	39, 42	mtbird 325	. 2 ⊢ (𝐴 ∈ (0(,)(2 · π)) → ¬ (sin‘(𝐴 / 2)) = 0)
44	43	neqned 2932	1 ⊢ (𝐴 ∈ (0(,)(2 · π)) → (sin‘(𝐴 / 2)) ≠ 0)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 = wceq 1540 ∈ wcel 2109 ≠ wne 2925 class class class wbr 5092 ‘cfv 6482 (class class class)co 7349 ℂcc 11007 ℝcr 11008 0cc0 11009 1c1 11010 + caddc 11012 · cmul 11014 ℝ^*cxr 11148 < clt 11149 / cdiv 11777 2c2 12183 ℤcz 12471 ℝ⁺crp 12893 (,)cioo 13248 sincsin 15970 πcpi 15973

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 5218 ax-sep 5235 ax-nul 5245 ax-pow 5304 ax-pr 5371 ax-un 7671 ax-inf2 9537 ax-cnex 11065 ax-resscn 11066 ax-1cn 11067 ax-icn 11068 ax-addcl 11069 ax-addrcl 11070 ax-mulcl 11071 ax-mulrcl 11072 ax-mulcom 11073 ax-addass 11074 ax-mulass 11075 ax-distr 11076 ax-i2m1 11077 ax-1ne0 11078 ax-1rid 11079 ax-rnegex 11080 ax-rrecex 11081 ax-cnre 11082 ax-pre-lttri 11083 ax-pre-lttrn 11084 ax-pre-ltadd 11085 ax-pre-mulgt0 11086 ax-pre-sup 11087 ax-addf 11088

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 3343 df-reu 3344 df-rab 3395 df-v 3438 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4285 df-if 4477 df-pw 4553 df-sn 4578 df-pr 4580 df-tp 4582 df-op 4584 df-uni 4859 df-int 4897 df-iun 4943 df-iin 4944 df-br 5093 df-opab 5155 df-mpt 5174 df-tr 5200 df-id 5514 df-eprel 5519 df-po 5527 df-so 5528 df-fr 5572 df-se 5573 df-we 5574 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-pred 6249 df-ord 6310 df-on 6311 df-lim 6312 df-suc 6313 df-iota 6438 df-fun 6484 df-fn 6485 df-f 6486 df-f1 6487 df-fo 6488 df-f1o 6489 df-fv 6490 df-isom 6491 df-riota 7306 df-ov 7352 df-oprab 7353 df-mpo 7354 df-of 7613 df-om 7800 df-1st 7924 df-2nd 7925 df-supp 8094 df-frecs 8214 df-wrecs 8245 df-recs 8294 df-rdg 8332 df-1o 8388 df-2o 8389 df-er 8625 df-map 8755 df-pm 8756 df-ixp 8825 df-en 8873 df-dom 8874 df-sdom 8875 df-fin 8876 df-fsupp 9252 df-fi 9301 df-sup 9332 df-inf 9333 df-oi 9402 df-card 9835 df-pnf 11151 df-mnf 11152 df-xr 11153 df-ltxr 11154 df-le 11155 df-sub 11349 df-neg 11350 df-div 11778 df-nn 12129 df-2 12191 df-3 12192 df-4 12193 df-5 12194 df-6 12195 df-7 12196 df-8 12197 df-9 12198 df-n0 12385 df-z 12472 df-dec 12592 df-uz 12736 df-q 12850 df-rp 12894 df-xneg 13014 df-xadd 13015 df-xmul 13016 df-ioo 13252 df-ioc 13253 df-ico 13254 df-icc 13255 df-fz 13411 df-fzo 13558 df-fl 13696 df-mod 13774 df-seq 13909 df-exp 13969 df-fac 14181 df-bc 14210 df-hash 14238 df-shft 14974 df-cj 15006 df-re 15007 df-im 15008 df-sqrt 15142 df-abs 15143 df-limsup 15378 df-clim 15395 df-rlim 15396 df-sum 15594 df-ef 15974 df-sin 15976 df-cos 15977 df-pi 15979 df-struct 17058 df-sets 17075 df-slot 17093 df-ndx 17105 df-base 17121 df-ress 17142 df-plusg 17174 df-mulr 17175 df-starv 17176 df-sca 17177 df-vsca 17178 df-ip 17179 df-tset 17180 df-ple 17181 df-ds 17183 df-unif 17184 df-hom 17185 df-cco 17186 df-rest 17326 df-topn 17327 df-0g 17345 df-gsum 17346 df-topgen 17347 df-pt 17348 df-prds 17351 df-xrs 17406 df-qtop 17411 df-imas 17412 df-xps 17414 df-mre 17488 df-mrc 17489 df-acs 17491 df-mgm 18514 df-sgrp 18593 df-mnd 18609 df-submnd 18658 df-mulg 18947 df-cntz 19196 df-cmn 19661 df-psmet 21253 df-xmet 21254 df-met 21255 df-bl 21256 df-mopn 21257 df-fbas 21258 df-fg 21259 df-cnfld 21262 df-top 22779 df-topon 22796 df-topsp 22818 df-bases 22831 df-cld 22904 df-ntr 22905 df-cls 22906 df-nei 22983 df-lp 23021 df-perf 23022 df-cn 23112 df-cnp 23113 df-haus 23200 df-tx 23447 df-hmeo 23640 df-fil 23731 df-fm 23823 df-flim 23824 df-flf 23825 df-xms 24206 df-ms 24207 df-tms 24208 df-cncf 24769 df-limc 25765 df-dv 25766

This theorem is referenced by: fourierdlem43 46151 fourierdlem44 46152

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