Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > altgnsg | Structured version Visualization version GIF version |
Description: The alternating group (pmEven‘𝐷) is a normal subgroup of the symmetric group. (Contributed by Thierry Arnoux, 18-Sep-2023.) |
Ref | Expression |
---|---|
evpmid.1 | ⊢ 𝑆 = (SymGrp‘𝐷) |
Ref | Expression |
---|---|
altgnsg | ⊢ (𝐷 ∈ Fin → (pmEven‘𝐷) ∈ (NrmSGrp‘𝑆)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex 3512 | . . 3 ⊢ (𝐷 ∈ Fin → 𝐷 ∈ V) | |
2 | fveq2 6670 | . . . . . 6 ⊢ (𝑑 = 𝐷 → (pmSgn‘𝑑) = (pmSgn‘𝐷)) | |
3 | 2 | cnveqd 5746 | . . . . 5 ⊢ (𝑑 = 𝐷 → ◡(pmSgn‘𝑑) = ◡(pmSgn‘𝐷)) |
4 | 3 | imaeq1d 5928 | . . . 4 ⊢ (𝑑 = 𝐷 → (◡(pmSgn‘𝑑) “ {1}) = (◡(pmSgn‘𝐷) “ {1})) |
5 | df-evpm 18620 | . . . 4 ⊢ pmEven = (𝑑 ∈ V ↦ (◡(pmSgn‘𝑑) “ {1})) | |
6 | fvex 6683 | . . . . . 6 ⊢ (pmSgn‘𝐷) ∈ V | |
7 | 6 | cnvex 7630 | . . . . 5 ⊢ ◡(pmSgn‘𝐷) ∈ V |
8 | 7 | imaex 7621 | . . . 4 ⊢ (◡(pmSgn‘𝐷) “ {1}) ∈ V |
9 | 4, 5, 8 | fvmpt 6768 | . . 3 ⊢ (𝐷 ∈ V → (pmEven‘𝐷) = (◡(pmSgn‘𝐷) “ {1})) |
10 | 1, 9 | syl 17 | . 2 ⊢ (𝐷 ∈ Fin → (pmEven‘𝐷) = (◡(pmSgn‘𝐷) “ {1})) |
11 | evpmid.1 | . . . 4 ⊢ 𝑆 = (SymGrp‘𝐷) | |
12 | eqid 2821 | . . . 4 ⊢ (pmSgn‘𝐷) = (pmSgn‘𝐷) | |
13 | eqid 2821 | . . . 4 ⊢ ((mulGrp‘ℂfld) ↾s {1, -1}) = ((mulGrp‘ℂfld) ↾s {1, -1}) | |
14 | 11, 12, 13 | psgnghm2 20725 | . . 3 ⊢ (𝐷 ∈ Fin → (pmSgn‘𝐷) ∈ (𝑆 GrpHom ((mulGrp‘ℂfld) ↾s {1, -1}))) |
15 | cnring 20567 | . . . . . 6 ⊢ ℂfld ∈ Ring | |
16 | eqid 2821 | . . . . . . 7 ⊢ (mulGrp‘ℂfld) = (mulGrp‘ℂfld) | |
17 | 16 | ringmgp 19303 | . . . . . 6 ⊢ (ℂfld ∈ Ring → (mulGrp‘ℂfld) ∈ Mnd) |
18 | 15, 17 | ax-mp 5 | . . . . 5 ⊢ (mulGrp‘ℂfld) ∈ Mnd |
19 | ax-1cn 10595 | . . . . . 6 ⊢ 1 ∈ ℂ | |
20 | prid1g 4696 | . . . . . 6 ⊢ (1 ∈ ℂ → 1 ∈ {1, -1}) | |
21 | 19, 20 | ax-mp 5 | . . . . 5 ⊢ 1 ∈ {1, -1} |
22 | neg1cn 11752 | . . . . . 6 ⊢ -1 ∈ ℂ | |
23 | prssi 4754 | . . . . . 6 ⊢ ((1 ∈ ℂ ∧ -1 ∈ ℂ) → {1, -1} ⊆ ℂ) | |
24 | 19, 22, 23 | mp2an 690 | . . . . 5 ⊢ {1, -1} ⊆ ℂ |
25 | cnfldbas 20549 | . . . . . . 7 ⊢ ℂ = (Base‘ℂfld) | |
26 | 16, 25 | mgpbas 19245 | . . . . . 6 ⊢ ℂ = (Base‘(mulGrp‘ℂfld)) |
27 | cnfld1 20570 | . . . . . . 7 ⊢ 1 = (1r‘ℂfld) | |
28 | 16, 27 | ringidval 19253 | . . . . . 6 ⊢ 1 = (0g‘(mulGrp‘ℂfld)) |
29 | 13, 26, 28 | ress0g 17939 | . . . . 5 ⊢ (((mulGrp‘ℂfld) ∈ Mnd ∧ 1 ∈ {1, -1} ∧ {1, -1} ⊆ ℂ) → 1 = (0g‘((mulGrp‘ℂfld) ↾s {1, -1}))) |
30 | 18, 21, 24, 29 | mp3an 1457 | . . . 4 ⊢ 1 = (0g‘((mulGrp‘ℂfld) ↾s {1, -1})) |
31 | 30 | ghmker 18384 | . . 3 ⊢ ((pmSgn‘𝐷) ∈ (𝑆 GrpHom ((mulGrp‘ℂfld) ↾s {1, -1})) → (◡(pmSgn‘𝐷) “ {1}) ∈ (NrmSGrp‘𝑆)) |
32 | 14, 31 | syl 17 | . 2 ⊢ (𝐷 ∈ Fin → (◡(pmSgn‘𝐷) “ {1}) ∈ (NrmSGrp‘𝑆)) |
33 | 10, 32 | eqeltrd 2913 | 1 ⊢ (𝐷 ∈ Fin → (pmEven‘𝐷) ∈ (NrmSGrp‘𝑆)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 Vcvv 3494 ⊆ wss 3936 {csn 4567 {cpr 4569 ◡ccnv 5554 “ cima 5558 ‘cfv 6355 (class class class)co 7156 Fincfn 8509 ℂcc 10535 1c1 10538 -cneg 10871 ↾s cress 16484 0gc0g 16713 Mndcmnd 17911 NrmSGrpcnsg 18274 GrpHom cghm 18355 SymGrpcsymg 18495 pmSgncpsgn 18617 pmEvencevpm 18618 mulGrpcmgp 19239 Ringcrg 19297 ℂfldccnfld 20545 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-rep 5190 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-cnex 10593 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 ax-addf 10616 ax-mulf 10617 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-xor 1502 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-ot 4576 df-uni 4839 df-int 4877 df-iun 4921 df-iin 4922 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-se 5515 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-isom 6364 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7581 df-1st 7689 df-2nd 7690 df-tpos 7892 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-1o 8102 df-2o 8103 df-oadd 8106 df-er 8289 df-map 8408 df-en 8510 df-dom 8511 df-sdom 8512 df-fin 8513 df-card 9368 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-div 11298 df-nn 11639 df-2 11701 df-3 11702 df-4 11703 df-5 11704 df-6 11705 df-7 11706 df-8 11707 df-9 11708 df-n0 11899 df-xnn0 11969 df-z 11983 df-dec 12100 df-uz 12245 df-rp 12391 df-fz 12894 df-fzo 13035 df-seq 13371 df-exp 13431 df-hash 13692 df-word 13863 df-lsw 13915 df-concat 13923 df-s1 13950 df-substr 14003 df-pfx 14033 df-splice 14112 df-reverse 14121 df-s2 14210 df-struct 16485 df-ndx 16486 df-slot 16487 df-base 16489 df-sets 16490 df-ress 16491 df-plusg 16578 df-mulr 16579 df-starv 16580 df-tset 16584 df-ple 16585 df-ds 16587 df-unif 16588 df-0g 16715 df-gsum 16716 df-mre 16857 df-mrc 16858 df-acs 16860 df-mgm 17852 df-sgrp 17901 df-mnd 17912 df-mhm 17956 df-submnd 17957 df-efmnd 18034 df-grp 18106 df-minusg 18107 df-sbg 18108 df-subg 18276 df-nsg 18277 df-ghm 18356 df-gim 18399 df-oppg 18474 df-symg 18496 df-pmtr 18570 df-psgn 18619 df-evpm 18620 df-cmn 18908 df-abl 18909 df-mgp 19240 df-ur 19252 df-ring 19299 df-cring 19300 df-oppr 19373 df-dvdsr 19391 df-unit 19392 df-invr 19422 df-dvr 19433 df-drng 19504 df-cnfld 20546 |
This theorem is referenced by: cyc3genpm 30794 |
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