Theorem symggrp 17820

Description: The symmetric group on a set 𝐴 is a group. (Contributed by Paul Chapman, 25-Feb-2008.) (Revised by Mario Carneiro, 13-Jan-2015.)

Hypothesis

Ref	Expression
symggrp.1	⊢ 𝐺 = (SymGrp‘𝐴)

Assertion

Ref	Expression
symggrp	⊢ (𝐴 ∈ 𝑉 → 𝐺 ∈ Grp)

Proof of Theorem symggrp

Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqidd 2623	. 2 ⊢ (𝐴 ∈ 𝑉 → (Base‘𝐺) = (Base‘𝐺))
2		eqidd 2623	. 2 ⊢ (𝐴 ∈ 𝑉 → (+g‘𝐺) = (+g‘𝐺))
3		symggrp.1	. . . 4 ⊢ 𝐺 = (SymGrp‘𝐴)
4		eqid 2622	. . . 4 ⊢ (Base‘𝐺) = (Base‘𝐺)
5		eqid 2622	. . . 4 ⊢ (+g‘𝐺) = (+g‘𝐺)
6	3, 4, 5	symgcl 17811	. . 3 ⊢ ((𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺)) → (𝑥(+g‘𝐺)𝑦) ∈ (Base‘𝐺))
7	6	3adant1 1079	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺)) → (𝑥(+g‘𝐺)𝑦) ∈ (Base‘𝐺))
8		coass 5654	. . . 4 ⊢ ((𝑥 ∘ 𝑦) ∘ 𝑧) = (𝑥 ∘ (𝑦 ∘ 𝑧))
9		simpr1 1067	. . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → 𝑥 ∈ (Base‘𝐺))
10		simpr2 1068	. . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → 𝑦 ∈ (Base‘𝐺))
11	3, 4, 5	symgov 17810	. . . . . 6 ⊢ ((𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺)) → (𝑥(+g‘𝐺)𝑦) = (𝑥 ∘ 𝑦))
12	9, 10, 11	syl2anc 693	. . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → (𝑥(+g‘𝐺)𝑦) = (𝑥 ∘ 𝑦))
13	12	coeq1d 5283	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → ((𝑥(+g‘𝐺)𝑦) ∘ 𝑧) = ((𝑥 ∘ 𝑦) ∘ 𝑧))
14		simpr3 1069	. . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → 𝑧 ∈ (Base‘𝐺))
15	3, 4, 5	symgov 17810	. . . . . 6 ⊢ ((𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺)) → (𝑦(+g‘𝐺)𝑧) = (𝑦 ∘ 𝑧))
16	10, 14, 15	syl2anc 693	. . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → (𝑦(+g‘𝐺)𝑧) = (𝑦 ∘ 𝑧))
17	16	coeq2d 5284	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → (𝑥 ∘ (𝑦(+g‘𝐺)𝑧)) = (𝑥 ∘ (𝑦 ∘ 𝑧)))
18	8, 13, 17	3eqtr4a 2682	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → ((𝑥(+g‘𝐺)𝑦) ∘ 𝑧) = (𝑥 ∘ (𝑦(+g‘𝐺)𝑧)))
19	9, 10, 6	syl2anc 693	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → (𝑥(+g‘𝐺)𝑦) ∈ (Base‘𝐺))
20	3, 4, 5	symgov 17810	. . . 4 ⊢ (((𝑥(+g‘𝐺)𝑦) ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺)) → ((𝑥(+g‘𝐺)𝑦)(+g‘𝐺)𝑧) = ((𝑥(+g‘𝐺)𝑦) ∘ 𝑧))
21	19, 14, 20	syl2anc 693	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → ((𝑥(+g‘𝐺)𝑦)(+g‘𝐺)𝑧) = ((𝑥(+g‘𝐺)𝑦) ∘ 𝑧))
22	3, 4, 5	symgcl 17811	. . . . 5 ⊢ ((𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺)) → (𝑦(+g‘𝐺)𝑧) ∈ (Base‘𝐺))
23	10, 14, 22	syl2anc 693	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → (𝑦(+g‘𝐺)𝑧) ∈ (Base‘𝐺))
24	3, 4, 5	symgov 17810	. . . 4 ⊢ ((𝑥 ∈ (Base‘𝐺) ∧ (𝑦(+g‘𝐺)𝑧) ∈ (Base‘𝐺)) → (𝑥(+g‘𝐺)(𝑦(+g‘𝐺)𝑧)) = (𝑥 ∘ (𝑦(+g‘𝐺)𝑧)))
25	9, 23, 24	syl2anc 693	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → (𝑥(+g‘𝐺)(𝑦(+g‘𝐺)𝑧)) = (𝑥 ∘ (𝑦(+g‘𝐺)𝑧)))
26	18, 21, 25	3eqtr4d 2666	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ (Base‘𝐺) ∧ 𝑦 ∈ (Base‘𝐺) ∧ 𝑧 ∈ (Base‘𝐺))) → ((𝑥(+g‘𝐺)𝑦)(+g‘𝐺)𝑧) = (𝑥(+g‘𝐺)(𝑦(+g‘𝐺)𝑧)))
27		f1oi 6174	. . 3 ⊢ ( I ↾ 𝐴):𝐴–1-1-onto→𝐴
28	3, 4	elsymgbas 17802	. . 3 ⊢ (𝐴 ∈ 𝑉 → (( I ↾ 𝐴) ∈ (Base‘𝐺) ↔ ( I ↾ 𝐴):𝐴–1-1-onto→𝐴))
29	27, 28	mpbiri 248	. 2 ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) ∈ (Base‘𝐺))
30	3, 4, 5	symgov 17810	. . . 4 ⊢ ((( I ↾ 𝐴) ∈ (Base‘𝐺) ∧ 𝑥 ∈ (Base‘𝐺)) → (( I ↾ 𝐴)(+g‘𝐺)𝑥) = (( I ↾ 𝐴) ∘ 𝑥))
31	29, 30	sylan 488	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑥 ∈ (Base‘𝐺)) → (( I ↾ 𝐴)(+g‘𝐺)𝑥) = (( I ↾ 𝐴) ∘ 𝑥))
32	3, 4	elsymgbas 17802	. . . . 5 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ (Base‘𝐺) ↔ 𝑥:𝐴–1-1-onto→𝐴))
33	32	biimpa 501	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑥 ∈ (Base‘𝐺)) → 𝑥:𝐴–1-1-onto→𝐴)
34		f1of 6137	. . . 4 ⊢ (𝑥:𝐴–1-1-onto→𝐴 → 𝑥:𝐴⟶𝐴)
35		fcoi2 6079	. . . 4 ⊢ (𝑥:𝐴⟶𝐴 → (( I ↾ 𝐴) ∘ 𝑥) = 𝑥)
36	33, 34, 35	3syl 18	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑥 ∈ (Base‘𝐺)) → (( I ↾ 𝐴) ∘ 𝑥) = 𝑥)
37	31, 36	eqtrd 2656	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑥 ∈ (Base‘𝐺)) → (( I ↾ 𝐴)(+g‘𝐺)𝑥) = 𝑥)
38		f1ocnv 6149	. . . . 5 ⊢ (𝑥:𝐴–1-1-onto→𝐴 → ◡𝑥:𝐴–1-1-onto→𝐴)
39	38	a1i 11	. . . 4 ⊢ (𝐴 ∈ 𝑉 → (𝑥:𝐴–1-1-onto→𝐴 → ◡𝑥:𝐴–1-1-onto→𝐴))
40	3, 4	elsymgbas 17802	. . . 4 ⊢ (𝐴 ∈ 𝑉 → (◡𝑥 ∈ (Base‘𝐺) ↔ ◡𝑥:𝐴–1-1-onto→𝐴))
41	39, 32, 40	3imtr4d 283	. . 3 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ (Base‘𝐺) → ◡𝑥 ∈ (Base‘𝐺)))
42	41	imp 445	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑥 ∈ (Base‘𝐺)) → ◡𝑥 ∈ (Base‘𝐺))
43	3, 4, 5	symgov 17810	. . . 4 ⊢ ((◡𝑥 ∈ (Base‘𝐺) ∧ 𝑥 ∈ (Base‘𝐺)) → (◡𝑥(+g‘𝐺)𝑥) = (◡𝑥 ∘ 𝑥))
44	42, 43	sylancom 701	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑥 ∈ (Base‘𝐺)) → (◡𝑥(+g‘𝐺)𝑥) = (◡𝑥 ∘ 𝑥))
45		f1ococnv1 6165	. . . 4 ⊢ (𝑥:𝐴–1-1-onto→𝐴 → (◡𝑥 ∘ 𝑥) = ( I ↾ 𝐴))
46	33, 45	syl 17	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑥 ∈ (Base‘𝐺)) → (◡𝑥 ∘ 𝑥) = ( I ↾ 𝐴))
47	44, 46	eqtrd 2656	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑥 ∈ (Base‘𝐺)) → (◡𝑥(+g‘𝐺)𝑥) = ( I ↾ 𝐴))
48	1, 2, 7, 26, 29, 37, 42, 47	isgrpd 17444	1 ⊢ (𝐴 ∈ 𝑉 → 𝐺 ∈ Grp)

Syntax hints:   → wi 4   ∧ wa 384   ∧ w3a 1037   = wceq 1483   ∈ wcel 1990   I cid 5023  ^◡ccnv 5113   ↾ cres 5116   ∘ ccom 5118  ⟶wf 5884  –1-1-onto→wf1o 5887  ‘cfv 5888  (class class class)co 6650  Basecbs 15857  +_gcplusg 15941  Grpcgrp 17422  SymGrpcsymg 17797

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-map 7859  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-2 11079  df-3 11080  df-4 11081  df-5 11082  df-6 11083  df-7 11084  df-8 11085  df-9 11086  df-n0 11293  df-z 11378  df-uz 11688  df-fz 12327  df-struct 15859  df-ndx 15860  df-slot 15861  df-base 15863  df-plusg 15954  df-tset 15960  df-0g 16102  df-mgm 17242  df-sgrp 17284  df-mnd 17295  df-grp 17425  df-symg 17798

This theorem is referenced by:  symgid  17821  symginv  17822  galactghm  17823  symgga  17826  pgrpsubgsymgbi  17827  pgrpsubgsymg  17828  idressubgsymg  17830  gsumccatsymgsn  17846  symgsssg  17887  symgfisg  17888  symggen  17890  symgtrinv  17892  psgnunilem5  17914  psgnunilem2  17915  psgnuni  17919  psgneldm2  17924  psgnfitr  17937  psgnghm  19926  zrhpsgninv  19931  evpmodpmf1o  19942  mdetleib2  20394  mdetdiag  20405  mdetralt  20414  mdetunilem7  20424  symgtgp  21905  symgfcoeu  29845  madjusmdetlem3  29895  madjusmdetlem4  29896  pgrple2abl  42146