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Theorem eqgen 17769
Description: Each coset is equipotent to the subgroup itself (which is also the coset containing the identity). (Contributed by Mario Carneiro, 20-Sep-2015.)
Hypotheses
Ref Expression
eqger.x 𝑋 = (Base‘𝐺)
eqger.r = (𝐺 ~QG 𝑌)
Assertion
Ref Expression
eqgen ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝐴 ∈ (𝑋 / )) → 𝑌𝐴)

Proof of Theorem eqgen
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqid 2724 . 2 (𝑋 / ) = (𝑋 / )
2 breq2 4764 . 2 ([𝑥] = 𝐴 → (𝑌 ≈ [𝑥] 𝑌𝐴))
3 simpl 474 . . . 4 ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑥𝑋) → 𝑌 ∈ (SubGrp‘𝐺))
4 subgrcl 17721 . . . . . . 7 (𝑌 ∈ (SubGrp‘𝐺) → 𝐺 ∈ Grp)
5 eqger.x . . . . . . . 8 𝑋 = (Base‘𝐺)
65subgss 17717 . . . . . . 7 (𝑌 ∈ (SubGrp‘𝐺) → 𝑌𝑋)
74, 6jca 555 . . . . . 6 (𝑌 ∈ (SubGrp‘𝐺) → (𝐺 ∈ Grp ∧ 𝑌𝑋))
8 eqger.r . . . . . . . 8 = (𝐺 ~QG 𝑌)
9 eqid 2724 . . . . . . . 8 (+g𝐺) = (+g𝐺)
105, 8, 9eqglact 17767 . . . . . . 7 ((𝐺 ∈ Grp ∧ 𝑌𝑋𝑥𝑋) → [𝑥] = ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) “ 𝑌))
11103expa 1111 . . . . . 6 (((𝐺 ∈ Grp ∧ 𝑌𝑋) ∧ 𝑥𝑋) → [𝑥] = ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) “ 𝑌))
127, 11sylan 489 . . . . 5 ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑥𝑋) → [𝑥] = ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) “ 𝑌))
13 ovex 6793 . . . . . . 7 (𝐺 ~QG 𝑌) ∈ V
148, 13eqeltri 2799 . . . . . 6 ∈ V
15 ecexg 7866 . . . . . 6 ( ∈ V → [𝑥] ∈ V)
1614, 15ax-mp 5 . . . . 5 [𝑥] ∈ V
1712, 16syl6eqelr 2812 . . . 4 ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑥𝑋) → ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) “ 𝑌) ∈ V)
18 eqid 2724 . . . . . . . . 9 (𝑦𝑋 ↦ (𝑧𝑋 ↦ (𝑦(+g𝐺)𝑧))) = (𝑦𝑋 ↦ (𝑧𝑋 ↦ (𝑦(+g𝐺)𝑧)))
1918, 5, 9grplactf1o 17641 . . . . . . . 8 ((𝐺 ∈ Grp ∧ 𝑥𝑋) → ((𝑦𝑋 ↦ (𝑧𝑋 ↦ (𝑦(+g𝐺)𝑧)))‘𝑥):𝑋1-1-onto𝑋)
2018, 5grplactfval 17638 . . . . . . . . . 10 (𝑥𝑋 → ((𝑦𝑋 ↦ (𝑧𝑋 ↦ (𝑦(+g𝐺)𝑧)))‘𝑥) = (𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)))
2120adantl 473 . . . . . . . . 9 ((𝐺 ∈ Grp ∧ 𝑥𝑋) → ((𝑦𝑋 ↦ (𝑧𝑋 ↦ (𝑦(+g𝐺)𝑧)))‘𝑥) = (𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)))
22 f1oeq1 6240 . . . . . . . . 9 (((𝑦𝑋 ↦ (𝑧𝑋 ↦ (𝑦(+g𝐺)𝑧)))‘𝑥) = (𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) → (((𝑦𝑋 ↦ (𝑧𝑋 ↦ (𝑦(+g𝐺)𝑧)))‘𝑥):𝑋1-1-onto𝑋 ↔ (𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)):𝑋1-1-onto𝑋))
2321, 22syl 17 . . . . . . . 8 ((𝐺 ∈ Grp ∧ 𝑥𝑋) → (((𝑦𝑋 ↦ (𝑧𝑋 ↦ (𝑦(+g𝐺)𝑧)))‘𝑥):𝑋1-1-onto𝑋 ↔ (𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)):𝑋1-1-onto𝑋))
2419, 23mpbid 222 . . . . . . 7 ((𝐺 ∈ Grp ∧ 𝑥𝑋) → (𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)):𝑋1-1-onto𝑋)
254, 24sylan 489 . . . . . 6 ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑥𝑋) → (𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)):𝑋1-1-onto𝑋)
26 f1of1 6249 . . . . . 6 ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)):𝑋1-1-onto𝑋 → (𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)):𝑋1-1𝑋)
2725, 26syl 17 . . . . 5 ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑥𝑋) → (𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)):𝑋1-1𝑋)
286adantr 472 . . . . 5 ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑥𝑋) → 𝑌𝑋)
29 f1ores 6264 . . . . 5 (((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)):𝑋1-1𝑋𝑌𝑋) → ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) ↾ 𝑌):𝑌1-1-onto→((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) “ 𝑌))
3027, 28, 29syl2anc 696 . . . 4 ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑥𝑋) → ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) ↾ 𝑌):𝑌1-1-onto→((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) “ 𝑌))
31 f1oen2g 8089 . . . 4 ((𝑌 ∈ (SubGrp‘𝐺) ∧ ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) “ 𝑌) ∈ V ∧ ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) ↾ 𝑌):𝑌1-1-onto→((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) “ 𝑌)) → 𝑌 ≈ ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) “ 𝑌))
323, 17, 30, 31syl3anc 1439 . . 3 ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑥𝑋) → 𝑌 ≈ ((𝑧𝑋 ↦ (𝑥(+g𝐺)𝑧)) “ 𝑌))
3332, 12breqtrrd 4788 . 2 ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝑥𝑋) → 𝑌 ≈ [𝑥] )
341, 2, 33ectocld 7932 1 ((𝑌 ∈ (SubGrp‘𝐺) ∧ 𝐴 ∈ (𝑋 / )) → 𝑌𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383   = wceq 1596  wcel 2103  Vcvv 3304  wss 3680   class class class wbr 4760  cmpt 4837  cres 5220  cima 5221  1-1wf1 5998  1-1-ontowf1o 6000  cfv 6001  (class class class)co 6765  [cec 7860   / cqs 7861  cen 8069  Basecbs 15980  +gcplusg 16064  Grpcgrp 17544  SubGrpcsubg 17710   ~QG cqg 17712
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1835  ax-4 1850  ax-5 1952  ax-6 2018  ax-7 2054  ax-8 2105  ax-9 2112  ax-10 2132  ax-11 2147  ax-12 2160  ax-13 2355  ax-ext 2704  ax-rep 4879  ax-sep 4889  ax-nul 4897  ax-pow 4948  ax-pr 5011  ax-un 7066
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1599  df-ex 1818  df-nf 1823  df-sb 2011  df-eu 2575  df-mo 2576  df-clab 2711  df-cleq 2717  df-clel 2720  df-nfc 2855  df-ne 2897  df-ral 3019  df-rex 3020  df-reu 3021  df-rmo 3022  df-rab 3023  df-v 3306  df-sbc 3542  df-csb 3640  df-dif 3683  df-un 3685  df-in 3687  df-ss 3694  df-nul 4024  df-if 4195  df-pw 4268  df-sn 4286  df-pr 4288  df-op 4292  df-uni 4545  df-iun 4630  df-br 4761  df-opab 4821  df-mpt 4838  df-id 5128  df-xp 5224  df-rel 5225  df-cnv 5226  df-co 5227  df-dm 5228  df-rn 5229  df-res 5230  df-ima 5231  df-iota 5964  df-fun 6003  df-fn 6004  df-f 6005  df-f1 6006  df-fo 6007  df-f1o 6008  df-fv 6009  df-riota 6726  df-ov 6768  df-oprab 6769  df-mpt2 6770  df-ec 7864  df-qs 7868  df-en 8073  df-0g 16225  df-mgm 17364  df-sgrp 17406  df-mnd 17417  df-grp 17547  df-minusg 17548  df-subg 17713  df-eqg 17715
This theorem is referenced by:  lagsubg2  17777  sylow2blem1  18156
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