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| Mirrors > Home > MPE Home > Th. List > homdmcoa | Structured version Visualization version GIF version | ||
| Description: If 𝐹:𝑋⟶𝑌 and 𝐺:𝑌⟶𝑍, then 𝐺 and 𝐹 are composable. (Contributed by Mario Carneiro, 11-Jan-2017.) |
| Ref | Expression |
|---|---|
| homdmcoa.o | ⊢ · = (compa‘𝐶) |
| homdmcoa.h | ⊢ 𝐻 = (Homa‘𝐶) |
| homdmcoa.f | ⊢ (𝜑 → 𝐹 ∈ (𝑋𝐻𝑌)) |
| homdmcoa.g | ⊢ (𝜑 → 𝐺 ∈ (𝑌𝐻𝑍)) |
| Ref | Expression |
|---|---|
| homdmcoa | ⊢ (𝜑 → 𝐺dom · 𝐹) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2734 | . . . 4 ⊢ (Arrow‘𝐶) = (Arrow‘𝐶) | |
| 2 | homdmcoa.h | . . . 4 ⊢ 𝐻 = (Homa‘𝐶) | |
| 3 | 1, 2 | homarw 17968 | . . 3 ⊢ (𝑋𝐻𝑌) ⊆ (Arrow‘𝐶) |
| 4 | homdmcoa.f | . . 3 ⊢ (𝜑 → 𝐹 ∈ (𝑋𝐻𝑌)) | |
| 5 | 3, 4 | sselid 3929 | . 2 ⊢ (𝜑 → 𝐹 ∈ (Arrow‘𝐶)) |
| 6 | 1, 2 | homarw 17968 | . . 3 ⊢ (𝑌𝐻𝑍) ⊆ (Arrow‘𝐶) |
| 7 | homdmcoa.g | . . 3 ⊢ (𝜑 → 𝐺 ∈ (𝑌𝐻𝑍)) | |
| 8 | 6, 7 | sselid 3929 | . 2 ⊢ (𝜑 → 𝐺 ∈ (Arrow‘𝐶)) |
| 9 | 2 | homacd 17963 | . . . 4 ⊢ (𝐹 ∈ (𝑋𝐻𝑌) → (coda‘𝐹) = 𝑌) |
| 10 | 4, 9 | syl 17 | . . 3 ⊢ (𝜑 → (coda‘𝐹) = 𝑌) |
| 11 | 2 | homadm 17962 | . . . 4 ⊢ (𝐺 ∈ (𝑌𝐻𝑍) → (doma‘𝐺) = 𝑌) |
| 12 | 7, 11 | syl 17 | . . 3 ⊢ (𝜑 → (doma‘𝐺) = 𝑌) |
| 13 | 10, 12 | eqtr4d 2772 | . 2 ⊢ (𝜑 → (coda‘𝐹) = (doma‘𝐺)) |
| 14 | homdmcoa.o | . . 3 ⊢ · = (compa‘𝐶) | |
| 15 | 14, 1 | eldmcoa 17987 | . 2 ⊢ (𝐺dom · 𝐹 ↔ (𝐹 ∈ (Arrow‘𝐶) ∧ 𝐺 ∈ (Arrow‘𝐶) ∧ (coda‘𝐹) = (doma‘𝐺))) |
| 16 | 5, 8, 13, 15 | syl3anbrc 1344 | 1 ⊢ (𝜑 → 𝐺dom · 𝐹) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ∈ wcel 2113 class class class wbr 5096 dom cdm 5622 ‘cfv 6490 (class class class)co 7356 domacdoma 17942 codaccoda 17943 Arrowcarw 17944 Homachoma 17945 compaccoa 17976 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2706 ax-rep 5222 ax-sep 5239 ax-nul 5249 ax-pow 5308 ax-pr 5375 ax-un 7678 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2809 df-nfc 2883 df-ne 2931 df-ral 3050 df-rex 3059 df-reu 3349 df-rab 3398 df-v 3440 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4579 df-pr 4581 df-op 4585 df-ot 4587 df-uni 4862 df-iun 4946 df-br 5097 df-opab 5159 df-mpt 5178 df-id 5517 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-iota 6446 df-fun 6492 df-fn 6493 df-f 6494 df-f1 6495 df-fo 6496 df-f1o 6497 df-fv 6498 df-ov 7359 df-oprab 7360 df-mpo 7361 df-1st 7931 df-2nd 7932 df-doma 17946 df-coda 17947 df-homa 17948 df-arw 17949 df-coa 17978 |
| This theorem is referenced by: (None) |
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