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Theorem qusgrp 17570
Description: If 𝑌 is a normal subgroup of 𝐺, then 𝐻 = 𝐺 / 𝑌 is a group, called the quotient of 𝐺 by 𝑌. (Contributed by Mario Carneiro, 14-Jun-2015.) (Revised by Mario Carneiro, 12-Aug-2015.)
Hypothesis
Ref Expression
qusgrp.h 𝐻 = (𝐺 /s (𝐺 ~QG 𝑆))
Assertion
Ref Expression
qusgrp (𝑆 ∈ (NrmSGrp‘𝐺) → 𝐻 ∈ Grp)

Proof of Theorem qusgrp
Dummy variables 𝑎 𝑏 𝑐 𝑑 𝑢 𝑣 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 qusgrp.h . . . 4 𝐻 = (𝐺 /s (𝐺 ~QG 𝑆))
21a1i 11 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → 𝐻 = (𝐺 /s (𝐺 ~QG 𝑆)))
3 eqidd 2622 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → (Base‘𝐺) = (Base‘𝐺))
4 eqidd 2622 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → (+g𝐺) = (+g𝐺))
5 nsgsubg 17547 . . . 4 (𝑆 ∈ (NrmSGrp‘𝐺) → 𝑆 ∈ (SubGrp‘𝐺))
6 eqid 2621 . . . . 5 (Base‘𝐺) = (Base‘𝐺)
7 eqid 2621 . . . . 5 (𝐺 ~QG 𝑆) = (𝐺 ~QG 𝑆)
86, 7eqger 17565 . . . 4 (𝑆 ∈ (SubGrp‘𝐺) → (𝐺 ~QG 𝑆) Er (Base‘𝐺))
95, 8syl 17 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → (𝐺 ~QG 𝑆) Er (Base‘𝐺))
10 subgrcl 17520 . . . 4 (𝑆 ∈ (SubGrp‘𝐺) → 𝐺 ∈ Grp)
115, 10syl 17 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → 𝐺 ∈ Grp)
12 eqid 2621 . . . 4 (+g𝐺) = (+g𝐺)
136, 7, 12eqgcpbl 17569 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → ((𝑎(𝐺 ~QG 𝑆)𝑐𝑏(𝐺 ~QG 𝑆)𝑑) → (𝑎(+g𝐺)𝑏)(𝐺 ~QG 𝑆)(𝑐(+g𝐺)𝑑)))
146, 12grpcl 17351 . . . 4 ((𝐺 ∈ Grp ∧ 𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺)) → (𝑢(+g𝐺)𝑣) ∈ (Base‘𝐺))
1511, 14syl3an1 1356 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺)) → (𝑢(+g𝐺)𝑣) ∈ (Base‘𝐺))
169adantr 481 . . . . 5 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → (𝐺 ~QG 𝑆) Er (Base‘𝐺))
1711adantr 481 . . . . . 6 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → 𝐺 ∈ Grp)
18 simpr1 1065 . . . . . . 7 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → 𝑢 ∈ (Base‘𝐺))
19 simpr2 1066 . . . . . . 7 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → 𝑣 ∈ (Base‘𝐺))
2017, 18, 19, 14syl3anc 1323 . . . . . 6 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → (𝑢(+g𝐺)𝑣) ∈ (Base‘𝐺))
21 simpr3 1067 . . . . . 6 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → 𝑤 ∈ (Base‘𝐺))
226, 12grpcl 17351 . . . . . 6 ((𝐺 ∈ Grp ∧ (𝑢(+g𝐺)𝑣) ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺)) → ((𝑢(+g𝐺)𝑣)(+g𝐺)𝑤) ∈ (Base‘𝐺))
2317, 20, 21, 22syl3anc 1323 . . . . 5 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → ((𝑢(+g𝐺)𝑣)(+g𝐺)𝑤) ∈ (Base‘𝐺))
2416, 23erref 7707 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → ((𝑢(+g𝐺)𝑣)(+g𝐺)𝑤)(𝐺 ~QG 𝑆)((𝑢(+g𝐺)𝑣)(+g𝐺)𝑤))
256, 12grpass 17352 . . . . 5 ((𝐺 ∈ Grp ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → ((𝑢(+g𝐺)𝑣)(+g𝐺)𝑤) = (𝑢(+g𝐺)(𝑣(+g𝐺)𝑤)))
2611, 25sylan 488 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → ((𝑢(+g𝐺)𝑣)(+g𝐺)𝑤) = (𝑢(+g𝐺)(𝑣(+g𝐺)𝑤)))
2724, 26breqtrd 4639 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → ((𝑢(+g𝐺)𝑣)(+g𝐺)𝑤)(𝐺 ~QG 𝑆)(𝑢(+g𝐺)(𝑣(+g𝐺)𝑤)))
28 eqid 2621 . . . . 5 (0g𝐺) = (0g𝐺)
296, 28grpidcl 17371 . . . 4 (𝐺 ∈ Grp → (0g𝐺) ∈ (Base‘𝐺))
3011, 29syl 17 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → (0g𝐺) ∈ (Base‘𝐺))
316, 12, 28grplid 17373 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑢 ∈ (Base‘𝐺)) → ((0g𝐺)(+g𝐺)𝑢) = 𝑢)
3211, 31sylan 488 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → ((0g𝐺)(+g𝐺)𝑢) = 𝑢)
339adantr 481 . . . . 5 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → (𝐺 ~QG 𝑆) Er (Base‘𝐺))
34 simpr 477 . . . . 5 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → 𝑢 ∈ (Base‘𝐺))
3533, 34erref 7707 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → 𝑢(𝐺 ~QG 𝑆)𝑢)
3632, 35eqbrtrd 4635 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → ((0g𝐺)(+g𝐺)𝑢)(𝐺 ~QG 𝑆)𝑢)
37 eqid 2621 . . . . 5 (invg𝐺) = (invg𝐺)
386, 37grpinvcl 17388 . . . 4 ((𝐺 ∈ Grp ∧ 𝑢 ∈ (Base‘𝐺)) → ((invg𝐺)‘𝑢) ∈ (Base‘𝐺))
3911, 38sylan 488 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → ((invg𝐺)‘𝑢) ∈ (Base‘𝐺))
406, 12, 28, 37grplinv 17389 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑢 ∈ (Base‘𝐺)) → (((invg𝐺)‘𝑢)(+g𝐺)𝑢) = (0g𝐺))
4111, 40sylan 488 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → (((invg𝐺)‘𝑢)(+g𝐺)𝑢) = (0g𝐺))
4230adantr 481 . . . . 5 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → (0g𝐺) ∈ (Base‘𝐺))
4333, 42erref 7707 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → (0g𝐺)(𝐺 ~QG 𝑆)(0g𝐺))
4441, 43eqbrtrd 4635 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → (((invg𝐺)‘𝑢)(+g𝐺)𝑢)(𝐺 ~QG 𝑆)(0g𝐺))
452, 3, 4, 9, 11, 13, 15, 27, 30, 36, 39, 44qusgrp2 17454 . 2 (𝑆 ∈ (NrmSGrp‘𝐺) → (𝐻 ∈ Grp ∧ [(0g𝐺)](𝐺 ~QG 𝑆) = (0g𝐻)))
4645simpld 475 1 (𝑆 ∈ (NrmSGrp‘𝐺) → 𝐻 ∈ Grp)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 384  w3a 1036   = wceq 1480  wcel 1987  cfv 5847  (class class class)co 6604   Er wer 7684  [cec 7685  Basecbs 15781  +gcplusg 15862  0gc0g 16021   /s cqus 16086  Grpcgrp 17343  invgcminusg 17344  SubGrpcsubg 17509  NrmSGrpcnsg 17510   ~QG cqg 17511
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-rep 4731  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902  ax-cnex 9936  ax-resscn 9937  ax-1cn 9938  ax-icn 9939  ax-addcl 9940  ax-addrcl 9941  ax-mulcl 9942  ax-mulrcl 9943  ax-mulcom 9944  ax-addass 9945  ax-mulass 9946  ax-distr 9947  ax-i2m1 9948  ax-1ne0 9949  ax-1rid 9950  ax-rnegex 9951  ax-rrecex 9952  ax-cnre 9953  ax-pre-lttri 9954  ax-pre-lttrn 9955  ax-pre-ltadd 9956  ax-pre-mulgt0 9957
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-nel 2894  df-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-pss 3571  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-tp 4153  df-op 4155  df-uni 4403  df-int 4441  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-tr 4713  df-eprel 4985  df-id 4989  df-po 4995  df-so 4996  df-fr 5033  df-we 5035  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-pred 5639  df-ord 5685  df-on 5686  df-lim 5687  df-suc 5688  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-riota 6565  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-om 7013  df-1st 7113  df-2nd 7114  df-wrecs 7352  df-recs 7413  df-rdg 7451  df-1o 7505  df-oadd 7509  df-er 7687  df-ec 7689  df-qs 7693  df-en 7900  df-dom 7901  df-sdom 7902  df-fin 7903  df-sup 8292  df-inf 8293  df-pnf 10020  df-mnf 10021  df-xr 10022  df-ltxr 10023  df-le 10024  df-sub 10212  df-neg 10213  df-nn 10965  df-2 11023  df-3 11024  df-4 11025  df-5 11026  df-6 11027  df-7 11028  df-8 11029  df-9 11030  df-n0 11237  df-z 11322  df-dec 11438  df-uz 11632  df-fz 12269  df-struct 15783  df-ndx 15784  df-slot 15785  df-base 15786  df-sets 15787  df-ress 15788  df-plusg 15875  df-mulr 15876  df-sca 15878  df-vsca 15879  df-ip 15880  df-tset 15881  df-ple 15882  df-ds 15885  df-0g 16023  df-imas 16089  df-qus 16090  df-mgm 17163  df-sgrp 17205  df-mnd 17216  df-grp 17346  df-minusg 17347  df-subg 17512  df-nsg 17513  df-eqg 17514
This theorem is referenced by:  qus0  17573  qusinv  17574  qusghm  17618  qusabl  18189  qustgplem  21834  rzgrp  24204
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