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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 2736 | . . . 4 ⊢ (Arrow‘𝐶) = (Arrow‘𝐶) | |
| 2 | homdmcoa.h | . . . 4 ⊢ 𝐻 = (Homa‘𝐶) | |
| 3 | 1, 2 | homarw 17972 | . . 3 ⊢ (𝑋𝐻𝑌) ⊆ (Arrow‘𝐶) |
| 4 | homdmcoa.f | . . 3 ⊢ (𝜑 → 𝐹 ∈ (𝑋𝐻𝑌)) | |
| 5 | 3, 4 | sselid 3931 | . 2 ⊢ (𝜑 → 𝐹 ∈ (Arrow‘𝐶)) |
| 6 | 1, 2 | homarw 17972 | . . 3 ⊢ (𝑌𝐻𝑍) ⊆ (Arrow‘𝐶) |
| 7 | homdmcoa.g | . . 3 ⊢ (𝜑 → 𝐺 ∈ (𝑌𝐻𝑍)) | |
| 8 | 6, 7 | sselid 3931 | . 2 ⊢ (𝜑 → 𝐺 ∈ (Arrow‘𝐶)) |
| 9 | 2 | homacd 17967 | . . . 4 ⊢ (𝐹 ∈ (𝑋𝐻𝑌) → (coda‘𝐹) = 𝑌) |
| 10 | 4, 9 | syl 17 | . . 3 ⊢ (𝜑 → (coda‘𝐹) = 𝑌) |
| 11 | 2 | homadm 17966 | . . . 4 ⊢ (𝐺 ∈ (𝑌𝐻𝑍) → (doma‘𝐺) = 𝑌) |
| 12 | 7, 11 | syl 17 | . . 3 ⊢ (𝜑 → (doma‘𝐺) = 𝑌) |
| 13 | 10, 12 | eqtr4d 2774 | . 2 ⊢ (𝜑 → (coda‘𝐹) = (doma‘𝐺)) |
| 14 | homdmcoa.o | . . 3 ⊢ · = (compa‘𝐶) | |
| 15 | 14, 1 | eldmcoa 17991 | . 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 5098 dom cdm 5624 ‘cfv 6492 (class class class)co 7358 domacdoma 17946 codaccoda 17947 Arrowcarw 17948 Homachoma 17949 compaccoa 17980 |
| 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 2184 ax-ext 2708 ax-rep 5224 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 |
| 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 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-ot 4589 df-uni 4864 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-ov 7361 df-oprab 7362 df-mpo 7363 df-1st 7933 df-2nd 7934 df-doma 17950 df-coda 17951 df-homa 17952 df-arw 17953 df-coa 17982 |
| This theorem is referenced by: (None) |
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