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Mirrors > Home > MPE Home > Th. List > gimco | Structured version Visualization version GIF version |
Description: The composition of group isomorphisms is a group isomorphism. (Contributed by Mario Carneiro, 21-Apr-2016.) |
Ref | Expression |
---|---|
gimco | ⊢ ((𝐹 ∈ (𝑇 GrpIso 𝑈) ∧ 𝐺 ∈ (𝑆 GrpIso 𝑇)) → (𝐹 ∘ 𝐺) ∈ (𝑆 GrpIso 𝑈)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | isgim2 18909 | . . 3 ⊢ (𝐹 ∈ (𝑇 GrpIso 𝑈) ↔ (𝐹 ∈ (𝑇 GrpHom 𝑈) ∧ ◡𝐹 ∈ (𝑈 GrpHom 𝑇))) | |
2 | isgim2 18909 | . . 3 ⊢ (𝐺 ∈ (𝑆 GrpIso 𝑇) ↔ (𝐺 ∈ (𝑆 GrpHom 𝑇) ∧ ◡𝐺 ∈ (𝑇 GrpHom 𝑆))) | |
3 | ghmco 18882 | . . . . 5 ⊢ ((𝐹 ∈ (𝑇 GrpHom 𝑈) ∧ 𝐺 ∈ (𝑆 GrpHom 𝑇)) → (𝐹 ∘ 𝐺) ∈ (𝑆 GrpHom 𝑈)) | |
4 | cnvco 5798 | . . . . . 6 ⊢ ◡(𝐹 ∘ 𝐺) = (◡𝐺 ∘ ◡𝐹) | |
5 | ghmco 18882 | . . . . . . 7 ⊢ ((◡𝐺 ∈ (𝑇 GrpHom 𝑆) ∧ ◡𝐹 ∈ (𝑈 GrpHom 𝑇)) → (◡𝐺 ∘ ◡𝐹) ∈ (𝑈 GrpHom 𝑆)) | |
6 | 5 | ancoms 458 | . . . . . 6 ⊢ ((◡𝐹 ∈ (𝑈 GrpHom 𝑇) ∧ ◡𝐺 ∈ (𝑇 GrpHom 𝑆)) → (◡𝐺 ∘ ◡𝐹) ∈ (𝑈 GrpHom 𝑆)) |
7 | 4, 6 | eqeltrid 2838 | . . . . 5 ⊢ ((◡𝐹 ∈ (𝑈 GrpHom 𝑇) ∧ ◡𝐺 ∈ (𝑇 GrpHom 𝑆)) → ◡(𝐹 ∘ 𝐺) ∈ (𝑈 GrpHom 𝑆)) |
8 | 3, 7 | anim12i 612 | . . . 4 ⊢ (((𝐹 ∈ (𝑇 GrpHom 𝑈) ∧ 𝐺 ∈ (𝑆 GrpHom 𝑇)) ∧ (◡𝐹 ∈ (𝑈 GrpHom 𝑇) ∧ ◡𝐺 ∈ (𝑇 GrpHom 𝑆))) → ((𝐹 ∘ 𝐺) ∈ (𝑆 GrpHom 𝑈) ∧ ◡(𝐹 ∘ 𝐺) ∈ (𝑈 GrpHom 𝑆))) |
9 | 8 | an4s 656 | . . 3 ⊢ (((𝐹 ∈ (𝑇 GrpHom 𝑈) ∧ ◡𝐹 ∈ (𝑈 GrpHom 𝑇)) ∧ (𝐺 ∈ (𝑆 GrpHom 𝑇) ∧ ◡𝐺 ∈ (𝑇 GrpHom 𝑆))) → ((𝐹 ∘ 𝐺) ∈ (𝑆 GrpHom 𝑈) ∧ ◡(𝐹 ∘ 𝐺) ∈ (𝑈 GrpHom 𝑆))) |
10 | 1, 2, 9 | syl2anb 597 | . 2 ⊢ ((𝐹 ∈ (𝑇 GrpIso 𝑈) ∧ 𝐺 ∈ (𝑆 GrpIso 𝑇)) → ((𝐹 ∘ 𝐺) ∈ (𝑆 GrpHom 𝑈) ∧ ◡(𝐹 ∘ 𝐺) ∈ (𝑈 GrpHom 𝑆))) |
11 | isgim2 18909 | . 2 ⊢ ((𝐹 ∘ 𝐺) ∈ (𝑆 GrpIso 𝑈) ↔ ((𝐹 ∘ 𝐺) ∈ (𝑆 GrpHom 𝑈) ∧ ◡(𝐹 ∘ 𝐺) ∈ (𝑈 GrpHom 𝑆))) | |
12 | 10, 11 | sylibr 233 | 1 ⊢ ((𝐹 ∈ (𝑇 GrpIso 𝑈) ∧ 𝐺 ∈ (𝑆 GrpIso 𝑇)) → (𝐹 ∘ 𝐺) ∈ (𝑆 GrpIso 𝑈)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2101 ◡ccnv 5590 ∘ ccom 5595 (class class class)co 7295 GrpHom cghm 18859 GrpIso cgim 18901 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2103 ax-9 2111 ax-10 2132 ax-11 2149 ax-12 2166 ax-ext 2704 ax-rep 5212 ax-sep 5226 ax-nul 5233 ax-pow 5291 ax-pr 5355 ax-un 7608 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3an 1087 df-tru 1540 df-fal 1550 df-ex 1778 df-nf 1782 df-sb 2063 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2884 df-ne 2939 df-ral 3060 df-rex 3069 df-rmo 3222 df-reu 3223 df-rab 3224 df-v 3436 df-sbc 3719 df-csb 3835 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4260 df-if 4463 df-pw 4538 df-sn 4565 df-pr 4567 df-op 4571 df-uni 4842 df-iun 4929 df-br 5078 df-opab 5140 df-mpt 5161 df-id 5491 df-xp 5597 df-rel 5598 df-cnv 5599 df-co 5600 df-dm 5601 df-rn 5602 df-res 5603 df-ima 5604 df-iota 6399 df-fun 6449 df-fn 6450 df-f 6451 df-f1 6452 df-fo 6453 df-f1o 6454 df-fv 6455 df-riota 7252 df-ov 7298 df-oprab 7299 df-mpo 7300 df-map 8637 df-0g 17180 df-mgm 18354 df-sgrp 18403 df-mnd 18414 df-mhm 18458 df-grp 18608 df-ghm 18860 df-gim 18903 |
This theorem is referenced by: gictr 18919 |
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