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Theorem qusgrp 18280
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 2827 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → (Base‘𝐺) = (Base‘𝐺))
4 eqidd 2827 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → (+g𝐺) = (+g𝐺))
5 nsgsubg 18255 . . . 4 (𝑆 ∈ (NrmSGrp‘𝐺) → 𝑆 ∈ (SubGrp‘𝐺))
6 eqid 2826 . . . . 5 (Base‘𝐺) = (Base‘𝐺)
7 eqid 2826 . . . . 5 (𝐺 ~QG 𝑆) = (𝐺 ~QG 𝑆)
86, 7eqger 18275 . . . 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 18229 . . . 4 (𝑆 ∈ (SubGrp‘𝐺) → 𝐺 ∈ Grp)
115, 10syl 17 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → 𝐺 ∈ Grp)
12 eqid 2826 . . . 4 (+g𝐺) = (+g𝐺)
136, 7, 12eqgcpbl 18279 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → ((𝑎(𝐺 ~QG 𝑆)𝑐𝑏(𝐺 ~QG 𝑆)𝑑) → (𝑎(+g𝐺)𝑏)(𝐺 ~QG 𝑆)(𝑐(+g𝐺)𝑑)))
146, 12grpcl 18056 . . . 4 ((𝐺 ∈ Grp ∧ 𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺)) → (𝑢(+g𝐺)𝑣) ∈ (Base‘𝐺))
1511, 14syl3an1 1157 . . 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 1188 . . . . . . 7 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → 𝑢 ∈ (Base‘𝐺))
19 simpr2 1189 . . . . . . 7 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → 𝑣 ∈ (Base‘𝐺))
2017, 18, 19, 14syl3anc 1365 . . . . . 6 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → (𝑢(+g𝐺)𝑣) ∈ (Base‘𝐺))
21 simpr3 1190 . . . . . 6 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → 𝑤 ∈ (Base‘𝐺))
226, 12grpcl 18056 . . . . . 6 ((𝐺 ∈ Grp ∧ (𝑢(+g𝐺)𝑣) ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺)) → ((𝑢(+g𝐺)𝑣)(+g𝐺)𝑤) ∈ (Base‘𝐺))
2317, 20, 21, 22syl3anc 1365 . . . . 5 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → ((𝑢(+g𝐺)𝑣)(+g𝐺)𝑤) ∈ (Base‘𝐺))
2416, 23erref 8304 . . . 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 18057 . . . . 5 ((𝐺 ∈ Grp ∧ (𝑢 ∈ (Base‘𝐺) ∧ 𝑣 ∈ (Base‘𝐺) ∧ 𝑤 ∈ (Base‘𝐺))) → ((𝑢(+g𝐺)𝑣)(+g𝐺)𝑤) = (𝑢(+g𝐺)(𝑣(+g𝐺)𝑤)))
2611, 25sylan 580 . . . 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 5089 . . 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 2826 . . . . 5 (0g𝐺) = (0g𝐺)
296, 28grpidcl 18076 . . . 4 (𝐺 ∈ Grp → (0g𝐺) ∈ (Base‘𝐺))
3011, 29syl 17 . . 3 (𝑆 ∈ (NrmSGrp‘𝐺) → (0g𝐺) ∈ (Base‘𝐺))
316, 12, 28grplid 18078 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑢 ∈ (Base‘𝐺)) → ((0g𝐺)(+g𝐺)𝑢) = 𝑢)
3211, 31sylan 580 . . . 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 485 . . . . 5 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → 𝑢 ∈ (Base‘𝐺))
3533, 34erref 8304 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → 𝑢(𝐺 ~QG 𝑆)𝑢)
3632, 35eqbrtrd 5085 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → ((0g𝐺)(+g𝐺)𝑢)(𝐺 ~QG 𝑆)𝑢)
37 eqid 2826 . . . . 5 (invg𝐺) = (invg𝐺)
386, 37grpinvcl 18096 . . . 4 ((𝐺 ∈ Grp ∧ 𝑢 ∈ (Base‘𝐺)) → ((invg𝐺)‘𝑢) ∈ (Base‘𝐺))
3911, 38sylan 580 . . 3 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → ((invg𝐺)‘𝑢) ∈ (Base‘𝐺))
406, 12, 28, 37grplinv 18097 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑢 ∈ (Base‘𝐺)) → (((invg𝐺)‘𝑢)(+g𝐺)𝑢) = (0g𝐺))
4111, 40sylan 580 . . . 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 8304 . . . 4 ((𝑆 ∈ (NrmSGrp‘𝐺) ∧ 𝑢 ∈ (Base‘𝐺)) → (0g𝐺)(𝐺 ~QG 𝑆)(0g𝐺))
4441, 43eqbrtrd 5085 . . 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 18162 . 2 (𝑆 ∈ (NrmSGrp‘𝐺) → (𝐻 ∈ Grp ∧ [(0g𝐺)](𝐺 ~QG 𝑆) = (0g𝐻)))
4645simpld 495 1 (𝑆 ∈ (NrmSGrp‘𝐺) → 𝐻 ∈ Grp)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396  w3a 1081   = wceq 1530  wcel 2107  cfv 6354  (class class class)co 7150   Er wer 8281  [cec 8282  Basecbs 16478  +gcplusg 16560  0gc0g 16708   /s cqus 16773  Grpcgrp 18048  invgcminusg 18049  SubGrpcsubg 18218  NrmSGrpcnsg 18219   ~QG cqg 18220
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-ext 2798  ax-rep 5187  ax-sep 5200  ax-nul 5207  ax-pow 5263  ax-pr 5326  ax-un 7455  ax-cnex 10587  ax-resscn 10588  ax-1cn 10589  ax-icn 10590  ax-addcl 10591  ax-addrcl 10592  ax-mulcl 10593  ax-mulrcl 10594  ax-mulcom 10595  ax-addass 10596  ax-mulass 10597  ax-distr 10598  ax-i2m1 10599  ax-1ne0 10600  ax-1rid 10601  ax-rnegex 10602  ax-rrecex 10603  ax-cnre 10604  ax-pre-lttri 10605  ax-pre-lttrn 10606  ax-pre-ltadd 10607  ax-pre-mulgt0 10608
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-3or 1082  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2620  df-eu 2652  df-clab 2805  df-cleq 2819  df-clel 2898  df-nfc 2968  df-ne 3022  df-nel 3129  df-ral 3148  df-rex 3149  df-reu 3150  df-rmo 3151  df-rab 3152  df-v 3502  df-sbc 3777  df-csb 3888  df-dif 3943  df-un 3945  df-in 3947  df-ss 3956  df-pss 3958  df-nul 4296  df-if 4471  df-pw 4544  df-sn 4565  df-pr 4567  df-tp 4569  df-op 4571  df-uni 4838  df-int 4875  df-iun 4919  df-br 5064  df-opab 5126  df-mpt 5144  df-tr 5170  df-id 5459  df-eprel 5464  df-po 5473  df-so 5474  df-fr 5513  df-we 5515  df-xp 5560  df-rel 5561  df-cnv 5562  df-co 5563  df-dm 5564  df-rn 5565  df-res 5566  df-ima 5567  df-pred 6147  df-ord 6193  df-on 6194  df-lim 6195  df-suc 6196  df-iota 6313  df-fun 6356  df-fn 6357  df-f 6358  df-f1 6359  df-fo 6360  df-f1o 6361  df-fv 6362  df-riota 7108  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7574  df-1st 7685  df-2nd 7686  df-wrecs 7943  df-recs 8004  df-rdg 8042  df-1o 8098  df-oadd 8102  df-er 8284  df-ec 8286  df-qs 8290  df-en 8504  df-dom 8505  df-sdom 8506  df-fin 8507  df-sup 8900  df-inf 8901  df-pnf 10671  df-mnf 10672  df-xr 10673  df-ltxr 10674  df-le 10675  df-sub 10866  df-neg 10867  df-nn 11633  df-2 11694  df-3 11695  df-4 11696  df-5 11697  df-6 11698  df-7 11699  df-8 11700  df-9 11701  df-n0 11892  df-z 11976  df-dec 12093  df-uz 12238  df-fz 12888  df-struct 16480  df-ndx 16481  df-slot 16482  df-base 16484  df-sets 16485  df-ress 16486  df-plusg 16573  df-mulr 16574  df-sca 16576  df-vsca 16577  df-ip 16578  df-tset 16579  df-ple 16580  df-ds 16582  df-0g 16710  df-imas 16776  df-qus 16777  df-mgm 17847  df-sgrp 17896  df-mnd 17907  df-grp 18051  df-minusg 18052  df-subg 18221  df-nsg 18222  df-eqg 18223
This theorem is referenced by:  qus0  18283  qusinv  18284  qusghm  18340  qusabl  18921  rzgrp  20702  qustgplem  22663
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