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Theorem psgnodpmr 21515

Description: If a permutation has sign -1 it is odd (not even). (Contributed by SO, 9-Jul-2018.)

**Hypotheses**
Ref	Expression
evpmss.s	⊢ 𝑆 = (SymGrp‘𝐷)
evpmss.p	⊢ 𝑃 = (Base‘𝑆)
psgnevpmb.n	⊢ 𝑁 = (pmSgn‘𝐷)

**Assertion**
Ref	Expression
psgnodpmr	⊢ ((𝐷 ∈ Fin ∧ 𝐹 ∈ 𝑃 ∧ (𝑁‘𝐹) = -1) → 𝐹 ∈ (𝑃 ∖ (pmEven‘𝐷)))

**Proof of Theorem psgnodpmr**
Step	Hyp	Ref	Expression
1		simp2 1135	. 2 ⊢ ((𝐷 ∈ Fin ∧ 𝐹 ∈ 𝑃 ∧ (𝑁‘𝐹) = -1) → 𝐹 ∈ 𝑃)
2		evpmss.s	. . . . . . . 8 ⊢ 𝑆 = (SymGrp‘𝐷)
3		evpmss.p	. . . . . . . 8 ⊢ 𝑃 = (Base‘𝑆)
4		psgnevpmb.n	. . . . . . . 8 ⊢ 𝑁 = (pmSgn‘𝐷)
5	2, 3, 4	psgnevpm 21514	. . . . . . 7 ⊢ ((𝐷 ∈ Fin ∧ 𝐹 ∈ (pmEven‘𝐷)) → (𝑁‘𝐹) = 1)
6	5	ex 412	. . . . . 6 ⊢ (𝐷 ∈ Fin → (𝐹 ∈ (pmEven‘𝐷) → (𝑁‘𝐹) = 1))
7	6	adantr 480	. . . . 5 ⊢ ((𝐷 ∈ Fin ∧ 𝐹 ∈ 𝑃) → (𝐹 ∈ (pmEven‘𝐷) → (𝑁‘𝐹) = 1))
8		neg1rr 12351	. . . . . . 7 ⊢ -1 ∈ ℝ
9		neg1lt0 12353	. . . . . . . 8 ⊢ -1 < 0
10		0lt1 11760	. . . . . . . 8 ⊢ 0 < 1
11		0re 11240	. . . . . . . . 9 ⊢ 0 ∈ ℝ
12		1re 11238	. . . . . . . . 9 ⊢ 1 ∈ ℝ
13	8, 11, 12	lttri 11364	. . . . . . . 8 ⊢ ((-1 < 0 ∧ 0 < 1) → -1 < 1)
14	9, 10, 13	mp2an 691	. . . . . . 7 ⊢ -1 < 1
15	8, 14	gtneii 11350	. . . . . 6 ⊢ 1 ≠ -1
16		neeq1 2999	. . . . . 6 ⊢ ((𝑁‘𝐹) = 1 → ((𝑁‘𝐹) ≠ -1 ↔ 1 ≠ -1))
17	15, 16	mpbiri 258	. . . . 5 ⊢ ((𝑁‘𝐹) = 1 → (𝑁‘𝐹) ≠ -1)
18	7, 17	syl6 35	. . . 4 ⊢ ((𝐷 ∈ Fin ∧ 𝐹 ∈ 𝑃) → (𝐹 ∈ (pmEven‘𝐷) → (𝑁‘𝐹) ≠ -1))
19	18	necon2bd 2952	. . 3 ⊢ ((𝐷 ∈ Fin ∧ 𝐹 ∈ 𝑃) → ((𝑁‘𝐹) = -1 → ¬ 𝐹 ∈ (pmEven‘𝐷)))
20	19	3impia 1115	. 2 ⊢ ((𝐷 ∈ Fin ∧ 𝐹 ∈ 𝑃 ∧ (𝑁‘𝐹) = -1) → ¬ 𝐹 ∈ (pmEven‘𝐷))
21	1, 20	eldifd 3956	1 ⊢ ((𝐷 ∈ Fin ∧ 𝐹 ∈ 𝑃 ∧ (𝑁‘𝐹) = -1) → 𝐹 ∈ (𝑃 ∖ (pmEven‘𝐷)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 ≠ wne 2936 ∖ cdif 3942 class class class wbr 5142 ‘cfv 6542 Fincfn 8957 0cc0 11132 1c1 11133 < clt 11272 -cneg 11469 Basecbs 17173 SymGrpcsymg 19314 pmSgncpsgn 19437 pmEvencevpm 19438

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209 ax-addf 11211 ax-mulf 11212

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-xor 1506 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-tp 4629 df-op 4631 df-ot 4633 df-uni 4904 df-int 4945 df-iun 4993 df-iin 4994 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 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 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 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7865 df-1st 7987 df-2nd 7988 df-tpos 8225 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-2o 8481 df-er 8718 df-map 8840 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-card 9956 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-div 11896 df-nn 12237 df-2 12299 df-3 12300 df-4 12301 df-5 12302 df-6 12303 df-7 12304 df-8 12305 df-9 12306 df-n0 12497 df-xnn0 12569 df-z 12583 df-dec 12702 df-uz 12847 df-rp 13001 df-fz 13511 df-fzo 13654 df-seq 13993 df-exp 14053 df-hash 14316 df-word 14491 df-lsw 14539 df-concat 14547 df-s1 14572 df-substr 14617 df-pfx 14647 df-splice 14726 df-reverse 14735 df-s2 14825 df-struct 17109 df-sets 17126 df-slot 17144 df-ndx 17156 df-base 17174 df-ress 17203 df-plusg 17239 df-mulr 17240 df-starv 17241 df-tset 17245 df-ple 17246 df-ds 17248 df-unif 17249 df-0g 17416 df-gsum 17417 df-mre 17559 df-mrc 17560 df-acs 17562 df-mgm 18593 df-sgrp 18672 df-mnd 18688 df-mhm 18733 df-submnd 18734 df-efmnd 18814 df-grp 18886 df-minusg 18887 df-subg 19071 df-ghm 19161 df-gim 19206 df-oppg 19290 df-symg 19315 df-pmtr 19390 df-psgn 19439 df-evpm 19440 df-cmn 19730 df-abl 19731 df-mgp 20068 df-rng 20086 df-ur 20115 df-ring 20168 df-cring 20169 df-oppr 20266 df-dvdsr 20289 df-unit 20290 df-invr 20320 df-dvr 20333 df-drng 20619 df-cnfld 21273

This theorem is referenced by: evpmodpmf1o 21521 pmtrodpm 21522 mdetralt 22503

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