psgnghm2 - Metamath Proof Explorer

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Theorem psgnghm2 21599

Description: The sign is a homomorphism from the finite symmetric group to the numeric signs. (Contributed by Stefan O'Rear, 28-Aug-2015.)

**Hypotheses**
Ref	Expression
psgnghm2.s	⊢ 𝑆 = (SymGrp‘𝐷)
psgnghm2.n	⊢ 𝑁 = (pmSgn‘𝐷)
psgnghm2.u	⊢ 𝑈 = ((mulGrp‘ℂ_fld) ↾_s {1, -1})

**Assertion**
Ref	Expression
psgnghm2	⊢ (𝐷 ∈ Fin → 𝑁 ∈ (𝑆 GrpHom 𝑈))

Proof of Theorem psgnghm2 Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		psgnghm2.s	. . 3 ⊢ 𝑆 = (SymGrp‘𝐷)
2		psgnghm2.n	. . 3 ⊢ 𝑁 = (pmSgn‘𝐷)
3		eqid 2737	. . 3 ⊢ (𝑆 ↾_s dom 𝑁) = (𝑆 ↾_s dom 𝑁)
4		psgnghm2.u	. . 3 ⊢ 𝑈 = ((mulGrp‘ℂ_fld) ↾_s {1, -1})
5	1, 2, 3, 4	psgnghm 21598	. 2 ⊢ (𝐷 ∈ Fin → 𝑁 ∈ ((𝑆 ↾_s dom 𝑁) GrpHom 𝑈))
6		eqid 2737	. . . . . . . 8 ⊢ (Base‘𝑆) = (Base‘𝑆)
7	1, 6	sygbasnfpfi 19530	. . . . . . 7 ⊢ ((𝐷 ∈ Fin ∧ 𝑥 ∈ (Base‘𝑆)) → dom (𝑥 ∖ I ) ∈ Fin)
8	7	ralrimiva 3146	. . . . . 6 ⊢ (𝐷 ∈ Fin → ∀𝑥 ∈ (Base‘𝑆)dom (𝑥 ∖ I ) ∈ Fin)
9		rabid2 3470	. . . . . 6 ⊢ ((Base‘𝑆) = {𝑥 ∈ (Base‘𝑆) ∣ dom (𝑥 ∖ I ) ∈ Fin} ↔ ∀𝑥 ∈ (Base‘𝑆)dom (𝑥 ∖ I ) ∈ Fin)
10	8, 9	sylibr 234	. . . . 5 ⊢ (𝐷 ∈ Fin → (Base‘𝑆) = {𝑥 ∈ (Base‘𝑆) ∣ dom (𝑥 ∖ I ) ∈ Fin})
11		eqid 2737	. . . . . . 7 ⊢ {𝑥 ∈ (Base‘𝑆) ∣ dom (𝑥 ∖ I ) ∈ Fin} = {𝑥 ∈ (Base‘𝑆) ∣ dom (𝑥 ∖ I ) ∈ Fin}
12	1, 6, 11, 2	psgnfn 19519	. . . . . 6 ⊢ 𝑁 Fn {𝑥 ∈ (Base‘𝑆) ∣ dom (𝑥 ∖ I ) ∈ Fin}
13	12	fndmi 6672	. . . . 5 ⊢ dom 𝑁 = {𝑥 ∈ (Base‘𝑆) ∣ dom (𝑥 ∖ I ) ∈ Fin}
14	10, 13	eqtr4di 2795	. . . 4 ⊢ (𝐷 ∈ Fin → (Base‘𝑆) = dom 𝑁)
15		eqimss 4042	. . . 4 ⊢ ((Base‘𝑆) = dom 𝑁 → (Base‘𝑆) ⊆ dom 𝑁)
16	1	fvexi 6920	. . . . 5 ⊢ 𝑆 ∈ V
17	2	fvexi 6920	. . . . . 6 ⊢ 𝑁 ∈ V
18	17	dmex 7931	. . . . 5 ⊢ dom 𝑁 ∈ V
19	3, 6	ressid2 17278	. . . . 5 ⊢ (((Base‘𝑆) ⊆ dom 𝑁 ∧ 𝑆 ∈ V ∧ dom 𝑁 ∈ V) → (𝑆 ↾_s dom 𝑁) = 𝑆)
20	16, 18, 19	mp3an23 1455	. . . 4 ⊢ ((Base‘𝑆) ⊆ dom 𝑁 → (𝑆 ↾_s dom 𝑁) = 𝑆)
21	14, 15, 20	3syl 18	. . 3 ⊢ (𝐷 ∈ Fin → (𝑆 ↾_s dom 𝑁) = 𝑆)
22	21	oveq1d 7446	. 2 ⊢ (𝐷 ∈ Fin → ((𝑆 ↾_s dom 𝑁) GrpHom 𝑈) = (𝑆 GrpHom 𝑈))
23	5, 22	eleqtrd 2843	1 ⊢ (𝐷 ∈ Fin → 𝑁 ∈ (𝑆 GrpHom 𝑈))

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1540 ∈ wcel 2108 ∀wral 3061 {crab 3436 Vcvv 3480 ∖ cdif 3948 ⊆ wss 3951 {cpr 4628 I cid 5577 dom cdm 5685 ‘cfv 6561 (class class class)co 7431 Fincfn 8985 1c1 11156 -cneg 11493 Basecbs 17247 ↾_s cress 17274 GrpHom cghm 19230 SymGrpcsymg 19386 pmSgncpsgn 19507 mulGrpcmgp 20137 ℂ_fldccnfld 21364

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 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-rep 5279 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 ax-cnex 11211 ax-resscn 11212 ax-1cn 11213 ax-icn 11214 ax-addcl 11215 ax-addrcl 11216 ax-mulcl 11217 ax-mulrcl 11218 ax-mulcom 11219 ax-addass 11220 ax-mulass 11221 ax-distr 11222 ax-i2m1 11223 ax-1ne0 11224 ax-1rid 11225 ax-rnegex 11226 ax-rrecex 11227 ax-cnre 11228 ax-pre-lttri 11229 ax-pre-lttrn 11230 ax-pre-ltadd 11231 ax-pre-mulgt0 11232 ax-addf 11234 ax-mulf 11235

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-xor 1512 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3380 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-tp 4631 df-op 4633 df-ot 4635 df-uni 4908 df-int 4947 df-iun 4993 df-iin 4994 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-se 5638 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-isom 6570 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-1st 8014 df-2nd 8015 df-tpos 8251 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-rdg 8450 df-1o 8506 df-2o 8507 df-er 8745 df-map 8868 df-en 8986 df-dom 8987 df-sdom 8988 df-fin 8989 df-card 9979 df-pnf 11297 df-mnf 11298 df-xr 11299 df-ltxr 11300 df-le 11301 df-sub 11494 df-neg 11495 df-div 11921 df-nn 12267 df-2 12329 df-3 12330 df-4 12331 df-5 12332 df-6 12333 df-7 12334 df-8 12335 df-9 12336 df-n0 12527 df-xnn0 12600 df-z 12614 df-dec 12734 df-uz 12879 df-rp 13035 df-fz 13548 df-fzo 13695 df-seq 14043 df-exp 14103 df-hash 14370 df-word 14553 df-lsw 14601 df-concat 14609 df-s1 14634 df-substr 14679 df-pfx 14709 df-splice 14788 df-reverse 14797 df-s2 14887 df-struct 17184 df-sets 17201 df-slot 17219 df-ndx 17231 df-base 17248 df-ress 17275 df-plusg 17310 df-mulr 17311 df-starv 17312 df-tset 17316 df-ple 17317 df-ds 17319 df-unif 17320 df-0g 17486 df-gsum 17487 df-mre 17629 df-mrc 17630 df-acs 17632 df-mgm 18653 df-sgrp 18732 df-mnd 18748 df-mhm 18796 df-submnd 18797 df-efmnd 18882 df-grp 18954 df-minusg 18955 df-subg 19141 df-ghm 19231 df-gim 19277 df-oppg 19364 df-symg 19387 df-pmtr 19460 df-psgn 19509 df-cmn 19800 df-abl 19801 df-mgp 20138 df-rng 20150 df-ur 20179 df-ring 20232 df-cring 20233 df-oppr 20334 df-dvdsr 20357 df-unit 20358 df-invr 20388 df-dvr 20401 df-drng 20731 df-cnfld 21365

This theorem is referenced by: psgninv 21600 psgnco 21601 zrhpsgnmhm 21602 zrhpsgninv 21603 psgnevpmb 21605 psgnodpm 21606 zrhpsgnevpm 21609 zrhpsgnodpm 21610 evpmodpmf1o 21614 mdetralt 22614 psgnid 33117 evpmsubg 33167 altgnsg 33169

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