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Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > sinaover2ne0 | Structured version Visualization version GIF version |
Description: If π΄ in (0, 2Ο) then sin(π΄ / 2) is not 0. (Contributed by Glauco Siliprandi, 11-Dec-2019.) |
Ref | Expression |
---|---|
sinaover2ne0 | β’ (π΄ β (0(,)(2 Β· Ο)) β (sinβ(π΄ / 2)) β 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elioore 13384 | . . . . . 6 β’ (π΄ β (0(,)(2 Β· Ο)) β π΄ β β) | |
2 | 1 | recnd 11270 | . . . . 5 β’ (π΄ β (0(,)(2 Β· Ο)) β π΄ β β) |
3 | 2cnd 12318 | . . . . 5 β’ (π΄ β (0(,)(2 Β· Ο)) β 2 β β) | |
4 | picn 26410 | . . . . . 6 β’ Ο β β | |
5 | 4 | a1i 11 | . . . . 5 β’ (π΄ β (0(,)(2 Β· Ο)) β Ο β β) |
6 | 2ne0 12344 | . . . . . 6 β’ 2 β 0 | |
7 | 6 | a1i 11 | . . . . 5 β’ (π΄ β (0(,)(2 Β· Ο)) β 2 β 0) |
8 | pire 26409 | . . . . . . 7 β’ Ο β β | |
9 | pipos 26411 | . . . . . . 7 β’ 0 < Ο | |
10 | 8, 9 | gt0ne0ii 11778 | . . . . . 6 β’ Ο β 0 |
11 | 10 | a1i 11 | . . . . 5 β’ (π΄ β (0(,)(2 Β· Ο)) β Ο β 0) |
12 | 2, 3, 5, 7, 11 | divdiv1d 12049 | . . . 4 β’ (π΄ β (0(,)(2 Β· Ο)) β ((π΄ / 2) / Ο) = (π΄ / (2 Β· Ο))) |
13 | 0zd 12598 | . . . . 5 β’ (π΄ β (0(,)(2 Β· Ο)) β 0 β β€) | |
14 | 2re 12314 | . . . . . . . 8 β’ 2 β β | |
15 | 14, 8 | remulcli 11258 | . . . . . . 7 β’ (2 Β· Ο) β β |
16 | 15 | a1i 11 | . . . . . 6 β’ (π΄ β (0(,)(2 Β· Ο)) β (2 Β· Ο) β β) |
17 | 0xr 11289 | . . . . . . . 8 β’ 0 β β* | |
18 | 17 | a1i 11 | . . . . . . 7 β’ (π΄ β (0(,)(2 Β· Ο)) β 0 β β*) |
19 | 16 | rexrd 11292 | . . . . . . 7 β’ (π΄ β (0(,)(2 Β· Ο)) β (2 Β· Ο) β β*) |
20 | id 22 | . . . . . . 7 β’ (π΄ β (0(,)(2 Β· Ο)) β π΄ β (0(,)(2 Β· Ο))) | |
21 | ioogtlb 44942 | . . . . . . 7 β’ ((0 β β* β§ (2 Β· Ο) β β* β§ π΄ β (0(,)(2 Β· Ο))) β 0 < π΄) | |
22 | 18, 19, 20, 21 | syl3anc 1368 | . . . . . 6 β’ (π΄ β (0(,)(2 Β· Ο)) β 0 < π΄) |
23 | 2pos 12343 | . . . . . . . 8 β’ 0 < 2 | |
24 | 14, 8, 23, 9 | mulgt0ii 11375 | . . . . . . 7 β’ 0 < (2 Β· Ο) |
25 | 24 | a1i 11 | . . . . . 6 β’ (π΄ β (0(,)(2 Β· Ο)) β 0 < (2 Β· Ο)) |
26 | 1, 16, 22, 25 | divgt0d 12177 | . . . . 5 β’ (π΄ β (0(,)(2 Β· Ο)) β 0 < (π΄ / (2 Β· Ο))) |
27 | 1rp 13008 | . . . . . . . 8 β’ 1 β β+ | |
28 | 27 | a1i 11 | . . . . . . 7 β’ (π΄ β (0(,)(2 Β· Ο)) β 1 β β+) |
29 | 16, 25 | elrpd 13043 | . . . . . . 7 β’ (π΄ β (0(,)(2 Β· Ο)) β (2 Β· Ο) β β+) |
30 | 2 | div1d 12010 | . . . . . . . 8 β’ (π΄ β (0(,)(2 Β· Ο)) β (π΄ / 1) = π΄) |
31 | iooltub 44957 | . . . . . . . . 9 β’ ((0 β β* β§ (2 Β· Ο) β β* β§ π΄ β (0(,)(2 Β· Ο))) β π΄ < (2 Β· Ο)) | |
32 | 18, 19, 20, 31 | syl3anc 1368 | . . . . . . . 8 β’ (π΄ β (0(,)(2 Β· Ο)) β π΄ < (2 Β· Ο)) |
33 | 30, 32 | eqbrtrd 5165 | . . . . . . 7 β’ (π΄ β (0(,)(2 Β· Ο)) β (π΄ / 1) < (2 Β· Ο)) |
34 | 1, 28, 29, 33 | ltdiv23d 13113 | . . . . . 6 β’ (π΄ β (0(,)(2 Β· Ο)) β (π΄ / (2 Β· Ο)) < 1) |
35 | 1e0p1 12747 | . . . . . 6 β’ 1 = (0 + 1) | |
36 | 34, 35 | breqtrdi 5184 | . . . . 5 β’ (π΄ β (0(,)(2 Β· Ο)) β (π΄ / (2 Β· Ο)) < (0 + 1)) |
37 | btwnnz 12666 | . . . . 5 β’ ((0 β β€ β§ 0 < (π΄ / (2 Β· Ο)) β§ (π΄ / (2 Β· Ο)) < (0 + 1)) β Β¬ (π΄ / (2 Β· Ο)) β β€) | |
38 | 13, 26, 36, 37 | syl3anc 1368 | . . . 4 β’ (π΄ β (0(,)(2 Β· Ο)) β Β¬ (π΄ / (2 Β· Ο)) β β€) |
39 | 12, 38 | eqneltrd 2845 | . . 3 β’ (π΄ β (0(,)(2 Β· Ο)) β Β¬ ((π΄ / 2) / Ο) β β€) |
40 | 2 | halfcld 12485 | . . . 4 β’ (π΄ β (0(,)(2 Β· Ο)) β (π΄ / 2) β β) |
41 | sineq0 26474 | . . . 4 β’ ((π΄ / 2) β β β ((sinβ(π΄ / 2)) = 0 β ((π΄ / 2) / Ο) β β€)) | |
42 | 40, 41 | syl 17 | . . 3 β’ (π΄ β (0(,)(2 Β· Ο)) β ((sinβ(π΄ / 2)) = 0 β ((π΄ / 2) / Ο) β β€)) |
43 | 39, 42 | mtbird 324 | . 2 β’ (π΄ β (0(,)(2 Β· Ο)) β Β¬ (sinβ(π΄ / 2)) = 0) |
44 | 43 | neqned 2937 | 1 β’ (π΄ β (0(,)(2 Β· Ο)) β (sinβ(π΄ / 2)) β 0) |
Colors of variables: wff setvar class |
Syntax hints: Β¬ wn 3 β wi 4 β wb 205 = wceq 1533 β wcel 2098 β wne 2930 class class class wbr 5143 βcfv 6542 (class class class)co 7415 βcc 11134 βcr 11135 0cc0 11136 1c1 11137 + caddc 11139 Β· cmul 11141 β*cxr 11275 < clt 11276 / cdiv 11899 2c2 12295 β€cz 12586 β+crp 13004 (,)cioo 13354 sincsin 16037 Οcpi 16040 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-rep 5280 ax-sep 5294 ax-nul 5301 ax-pow 5359 ax-pr 5423 ax-un 7737 ax-inf2 9662 ax-cnex 11192 ax-resscn 11193 ax-1cn 11194 ax-icn 11195 ax-addcl 11196 ax-addrcl 11197 ax-mulcl 11198 ax-mulrcl 11199 ax-mulcom 11200 ax-addass 11201 ax-mulass 11202 ax-distr 11203 ax-i2m1 11204 ax-1ne0 11205 ax-1rid 11206 ax-rnegex 11207 ax-rrecex 11208 ax-cnre 11209 ax-pre-lttri 11210 ax-pre-lttrn 11211 ax-pre-ltadd 11212 ax-pre-mulgt0 11213 ax-pre-sup 11214 ax-addf 11215 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3770 df-csb 3886 df-dif 3943 df-un 3945 df-in 3947 df-ss 3957 df-pss 3960 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-tp 4629 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-iin 4994 df-br 5144 df-opab 5206 df-mpt 5227 df-tr 5261 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-se 5628 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 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 7371 df-ov 7418 df-oprab 7419 df-mpo 7420 df-of 7681 df-om 7868 df-1st 7989 df-2nd 7990 df-supp 8162 df-frecs 8283 df-wrecs 8314 df-recs 8388 df-rdg 8427 df-1o 8483 df-2o 8484 df-er 8721 df-map 8843 df-pm 8844 df-ixp 8913 df-en 8961 df-dom 8962 df-sdom 8963 df-fin 8964 df-fsupp 9384 df-fi 9432 df-sup 9463 df-inf 9464 df-oi 9531 df-card 9960 df-pnf 11278 df-mnf 11279 df-xr 11280 df-ltxr 11281 df-le 11282 df-sub 11474 df-neg 11475 df-div 11900 df-nn 12241 df-2 12303 df-3 12304 df-4 12305 df-5 12306 df-6 12307 df-7 12308 df-8 12309 df-9 12310 df-n0 12501 df-z 12587 df-dec 12706 df-uz 12851 df-q 12961 df-rp 13005 df-xneg 13122 df-xadd 13123 df-xmul 13124 df-ioo 13358 df-ioc 13359 df-ico 13360 df-icc 13361 df-fz 13515 df-fzo 13658 df-fl 13787 df-mod 13865 df-seq 13997 df-exp 14057 df-fac 14263 df-bc 14292 df-hash 14320 df-shft 15044 df-cj 15076 df-re 15077 df-im 15078 df-sqrt 15212 df-abs 15213 df-limsup 15445 df-clim 15462 df-rlim 15463 df-sum 15663 df-ef 16041 df-sin 16043 df-cos 16044 df-pi 16046 df-struct 17113 df-sets 17130 df-slot 17148 df-ndx 17160 df-base 17178 df-ress 17207 df-plusg 17243 df-mulr 17244 df-starv 17245 df-sca 17246 df-vsca 17247 df-ip 17248 df-tset 17249 df-ple 17250 df-ds 17252 df-unif 17253 df-hom 17254 df-cco 17255 df-rest 17401 df-topn 17402 df-0g 17420 df-gsum 17421 df-topgen 17422 df-pt 17423 df-prds 17426 df-xrs 17481 df-qtop 17486 df-imas 17487 df-xps 17489 df-mre 17563 df-mrc 17564 df-acs 17566 df-mgm 18597 df-sgrp 18676 df-mnd 18692 df-submnd 18738 df-mulg 19026 df-cntz 19270 df-cmn 19739 df-psmet 21273 df-xmet 21274 df-met 21275 df-bl 21276 df-mopn 21277 df-fbas 21278 df-fg 21279 df-cnfld 21282 df-top 22812 df-topon 22829 df-topsp 22851 df-bases 22865 df-cld 22939 df-ntr 22940 df-cls 22941 df-nei 23018 df-lp 23056 df-perf 23057 df-cn 23147 df-cnp 23148 df-haus 23235 df-tx 23482 df-hmeo 23675 df-fil 23766 df-fm 23858 df-flim 23859 df-flf 23860 df-xms 24242 df-ms 24243 df-tms 24244 df-cncf 24814 df-limc 25811 df-dv 25812 |
This theorem is referenced by: fourierdlem43 45600 fourierdlem44 45601 |
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