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| Mirrors > Home > MPE Home > Th. List > gimcnv | Structured version Visualization version GIF version | ||
| 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.) |
| Ref | Expression |
|---|---|
| gimcnv | ⊢ (𝐹 ∈ (𝑆 GrpIso 𝑇) → ◡𝐹 ∈ (𝑇 GrpIso 𝑆)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2765 | . . . . . 6 ⊢ (Base‘𝑆) = (Base‘𝑆) | |
| 2 | eqid 2765 | . . . . . 6 ⊢ (Base‘𝑇) = (Base‘𝑇) | |
| 3 | 1, 2 | ghmf 19281 | . . . . 5 ⊢ (𝐹 ∈ (𝑆 GrpHom 𝑇) → 𝐹:(Base‘𝑆)⟶(Base‘𝑇)) |
| 4 | frel 6701 | . . . . . 6 ⊢ (𝐹:(Base‘𝑆)⟶(Base‘𝑇) → Rel 𝐹) | |
| 5 | dfrel2 6179 | . . . . . 6 ⊢ (Rel 𝐹 ↔ ◡◡𝐹 = 𝐹) | |
| 6 | 4, 5 | sylib 221 | . . . . 5 ⊢ (𝐹:(Base‘𝑆)⟶(Base‘𝑇) → ◡◡𝐹 = 𝐹) |
| 7 | 3, 6 | syl 18 | . . . 4 ⊢ (𝐹 ∈ (𝑆 GrpHom 𝑇) → ◡◡𝐹 = 𝐹) |
| 8 | id 23 | . . . 4 ⊢ (𝐹 ∈ (𝑆 GrpHom 𝑇) → 𝐹 ∈ (𝑆 GrpHom 𝑇)) | |
| 9 | 7, 8 | eqeltrd 2865 | . . 3 ⊢ (𝐹 ∈ (𝑆 GrpHom 𝑇) → ◡◡𝐹 ∈ (𝑆 GrpHom 𝑇)) |
| 10 | 9 | anim1ci 627 | . 2 ⊢ ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ ◡𝐹 ∈ (𝑇 GrpHom 𝑆)) → (◡𝐹 ∈ (𝑇 GrpHom 𝑆) ∧ ◡◡𝐹 ∈ (𝑆 GrpHom 𝑇))) |
| 11 | isgim2 19326 | . 2 ⊢ (𝐹 ∈ (𝑆 GrpIso 𝑇) ↔ (𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ ◡𝐹 ∈ (𝑇 GrpHom 𝑆))) | |
| 12 | isgim2 19326 | . 2 ⊢ (◡𝐹 ∈ (𝑇 GrpIso 𝑆) ↔ (◡𝐹 ∈ (𝑇 GrpHom 𝑆) ∧ ◡◡𝐹 ∈ (𝑆 GrpHom 𝑇))) | |
| 13 | 10, 11, 12 | 3imtr4i 295 | 1 ⊢ (𝐹 ∈ (𝑆 GrpIso 𝑇) → ◡𝐹 ∈ (𝑇 GrpIso 𝑆)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 = wceq 1563 ∈ wcel 2145 ◡ccnv 5651 Rel wrel 5657 ⟶wf 6521 ‘cfv 6525 (class class class)co 7400 Basecbs 17259 GrpHom cghm 19274 GrpIso cgim 19318 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-sep 5251 ax-nul 5261 ax-pow 5327 ax-pr 5395 ax-un 7722 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3080 df-rex 3090 df-rab 3418 df-v 3459 df-sbc 3748 df-csb 3856 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4869 df-iun 4954 df-br 5106 df-opab 5168 df-mpt 5187 df-id 5547 df-xp 5658 df-rel 5659 df-cnv 5660 df-co 5661 df-dm 5662 df-rn 5663 df-res 5664 df-ima 5665 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-ov 7403 df-oprab 7404 df-mpo 7405 df-1st 7974 df-2nd 7975 df-map 8814 df-mgm 18688 df-sgrp 18767 df-mnd 18783 df-grp 18993 df-ghm 19275 df-gim 19320 |
| This theorem is referenced by: gicsym 19336 reloggim 26722 abliso 33268 |
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