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Theorem gicer 19378
Description: Isomorphism is an equivalence relation on groups. (Contributed by Mario Carneiro, 21-Apr-2016.) (Proof shortened by AV, 1-May-2021.)
Assertion
Ref Expression
gicer 𝑔 Er Grp

Proof of Theorem gicer
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-gic 19361 . . . 4 𝑔 = ( GrpIso “ (V ∖ 1o))
2 cnvimass 6089 . . . . 5 ( GrpIso “ (V ∖ 1o)) ⊆ dom GrpIso
3 gimfn 19362 . . . . . 6 GrpIso Fn (Grp × Grp)
43fndmi 6646 . . . . 5 dom GrpIso = (Grp × Grp)
52, 4sseqtri 3988 . . . 4 ( GrpIso “ (V ∖ 1o)) ⊆ (Grp × Grp)
61, 5eqsstri 3986 . . 3 𝑔 ⊆ (Grp × Grp)
7 relxp 5684 . . 3 Rel (Grp × Grp)
8 relss 5773 . . 3 ( ≃𝑔 ⊆ (Grp × Grp) → (Rel (Grp × Grp) → Rel ≃𝑔 ))
96, 7, 8mp2 9 . 2 Rel ≃𝑔
10 gicsym 19376 . 2 (𝑥𝑔 𝑦𝑦𝑔 𝑥)
11 gictr 19377 . 2 ((𝑥𝑔 𝑦𝑦𝑔 𝑧) → 𝑥𝑔 𝑧)
12 gicref 19373 . . 3 (𝑥 ∈ Grp → 𝑥𝑔 𝑥)
13 giclcl 19374 . . 3 (𝑥𝑔 𝑥𝑥 ∈ Grp)
1412, 13impbii 212 . 2 (𝑥 ∈ Grp ↔ 𝑥𝑔 𝑥)
159, 10, 11, 14iseri 8731 1 𝑔 Er Grp
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wcel 2146  Vcvv 3458  cdif 3905  wss 3908   class class class wbr 5114   × cxp 5664  ccnv 5665  dom cdm 5666  cima 5669  Rel wrel 5671  1oc1o 8455   Er wer 8700  Grpcgrp 19031   GrpIso cgim 19358  𝑔 cgic 19359
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2738  ax-sep 5262  ax-nul 5274  ax-pow 5341  ax-pr 5409  ax-un 7745
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2570  df-eu 2600  df-clab 2745  df-cleq 2758  df-clel 2841  df-nfc 2915  df-ne 2962  df-ral 3083  df-rex 3093  df-rmo 3372  df-reu 3373  df-rab 3420  df-v 3460  df-sbc 3748  df-csb 3857  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4290  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4878  df-iun 4963  df-br 5115  df-opab 5179  df-mpt 5198  df-id 5561  df-xp 5672  df-rel 5673  df-cnv 5674  df-co 5675  df-dm 5676  df-rn 5677  df-res 5678  df-ima 5679  df-suc 6373  df-iota 6499  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-riota 7380  df-ov 7426  df-oprab 7427  df-mpo 7428  df-1st 7995  df-2nd 7996  df-1o 8462  df-er 8703  df-map 8835  df-0g 17519  df-mgm 18723  df-sgrp 18806  df-mnd 18822  df-mhm 18872  df-grp 19034  df-ghm 19315  df-gim 19360  df-gic 19361
This theorem is used by: (None)
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