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Theorem gimcnv 19510
Description: The converse of a group isomorphism is a group isomorphism. (Contributed by Stefan O'Rear, 25-Jan-2015.) (Revised by Mario Carneiro, 6-May-2015.)
Assertion
Ref Expression
gimcnv (𝐹 ∈ (𝑆 GrpIso 𝑇) → ◡𝐹 ∈ (𝑇 GrpIso 𝑆))

Proof of Theorem gimcnv
StepHypRef Expression
1 eqid 2763 . . . . . 6 (Base‘𝑆) = (Base‘𝑆)
2 eqid 2763 . . . . . 6 (Base‘𝑇) = (Base‘𝑇)
31, 2ghmf 19463 . . . . 5 (𝐹 ∈ (𝑆 GrpHom 𝑇) → 𝐹:(Base‘𝑆)⟶(Base‘𝑇))
4 frel 6737 . . . . . 6 (𝐹:(Base‘𝑆)⟶(Base‘𝑇) → Rel 𝐹)
5 dfrel2 6193 . . . . . 6 (Rel 𝐹 ↔ ◡◡𝐹 = 𝐹)
64, 5sylib 221 . . . . 5 (𝐹:(Base‘𝑆)⟶(Base‘𝑇) → ◡◡𝐹 = 𝐹)
73, 6syl 18 . . . 4 (𝐹 ∈ (𝑆 GrpHom 𝑇) → ◡◡𝐹 = 𝐹)
8 id 23 . . . 4 (𝐹 ∈ (𝑆 GrpHom 𝑇) → 𝐹 ∈ (𝑆 GrpHom 𝑇))
97, 8eqeltrd 2864 . . 3 (𝐹 ∈ (𝑆 GrpHom 𝑇) → ◡◡𝐹 ∈ (𝑆 GrpHom 𝑇))
109anim1ci 628 . 2 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ ◡𝐹 ∈ (𝑇 GrpHom 𝑆)) → (◡𝐹 ∈ (𝑇 GrpHom 𝑆) ∧ ◡◡𝐹 ∈ (𝑆 GrpHom 𝑇)))
11 isgim2 19508 . 2 (𝐹 ∈ (𝑆 GrpIso 𝑇) ↔ (𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ ◡𝐹 ∈ (𝑇 GrpHom 𝑆)))
12 isgim2 19508 . 2 (◡𝐹 ∈ (𝑇 GrpIso 𝑆) ↔ (◡𝐹 ∈ (𝑇 GrpHom 𝑆) ∧ ◡◡𝐹 ∈ (𝑆 GrpHom 𝑇)))
1310, 11, 123imtr4i 295 1 (𝐹 ∈ (𝑆 GrpIso 𝑇) → ◡𝐹 ∈ (𝑇 GrpIso 𝑆))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1570   ∈ wcel 2147  ◡ccnv 5654  Rel wrel 5660  ⟶wf 6554  ‘cfv 6558  (class class class)co 7443  Basecbs 17416   GrpHom cghm 19456   GrpIso cgim 19500
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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5252  ax-nul 5263  ax-pow 5331  ax-pr 5395  ax-un 7775
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 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-iun 4956  df-br 5107  df-opab 5171  df-mpt 5190  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-iota 6512  df-fun 6560  df-fn 6561  df-f 6562  df-f1 6563  df-fo 6564  df-f1o 6565  df-fv 6566  df-ov 7446  df-oprab 7447  df-mpo 7448  df-1st 8025  df-2nd 8026  df-map 8877  df-mgm 18845  df-sgrp 18937  df-mnd 18953  df-grp 19176  df-ghm 19457  df-gim 19502
This theorem is used by:  gicsym  19519  reloggim  26957  abliso  33666
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