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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 2762 | . . . 4 ⊢ (Arrow‘𝐶) = (Arrow‘𝐶) | |
| 2 | homdmcoa.h | . . . 4 ⊢ 𝐻 = (Homa‘𝐶) | |
| 3 | 1, 2 | homarw 18139 | . . 3 ⊢ (𝑋𝐻𝑌) ⊆ (Arrow‘𝐶) |
| 4 | homdmcoa.f | . . 3 ⊢ (𝜑 → 𝐹 ∈ (𝑋𝐻𝑌)) | |
| 5 | 3, 4 | sselid 3932 | . 2 ⊢ (𝜑 → 𝐹 ∈ (Arrow‘𝐶)) |
| 6 | 1, 2 | homarw 18139 | . . 3 ⊢ (𝑌𝐻𝑍) ⊆ (Arrow‘𝐶) |
| 7 | homdmcoa.g | . . 3 ⊢ (𝜑 → 𝐺 ∈ (𝑌𝐻𝑍)) | |
| 8 | 6, 7 | sselid 3932 | . 2 ⊢ (𝜑 → 𝐺 ∈ (Arrow‘𝐶)) |
| 9 | 2 | homacd 18134 | . . . 4 ⊢ (𝐹 ∈ (𝑋𝐻𝑌) → (coda‘𝐹) = 𝑌) |
| 10 | 4, 9 | syl 18 | . . 3 ⊢ (𝜑 → (coda‘𝐹) = 𝑌) |
| 11 | 2 | homadm 18133 | . . . 4 ⊢ (𝐺 ∈ (𝑌𝐻𝑍) → (doma‘𝐺) = 𝑌) |
| 12 | 7, 11 | syl 18 | . . 3 ⊢ (𝜑 → (doma‘𝐺) = 𝑌) |
| 13 | 10, 12 | eqtr4d 2800 | . 2 ⊢ (𝜑 → (coda‘𝐹) = (doma‘𝐺)) |
| 14 | homdmcoa.o | . . 3 ⊢ · = (compa‘𝐶) | |
| 15 | 14, 1 | eldmcoa 18158 | . 2 ⊢ (𝐺dom · 𝐹 ↔ (𝐹 ∈ (Arrow‘𝐶) ∧ 𝐺 ∈ (Arrow‘𝐶) ∧ (coda‘𝐹) = (doma‘𝐺))) |
| 16 | 5, 8, 13, 15 | syl3anbrc 1362 | 1 ⊢ (𝜑 → 𝐺dom · 𝐹) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2145 class class class wbr 5107 dom cdm 5659 ‘cfv 6537 (class class class)co 7416 domacdoma 18113 codaccoda 18114 Arrowcarw 18115 Homachoma 18116 compaccoa 18147 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-rep 5236 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 |
| 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 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-ot 4596 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-ov 7419 df-oprab 7420 df-mpo 7421 df-1st 7989 df-2nd 7990 df-doma 18117 df-coda 18118 df-homa 18119 df-arw 18120 df-coa 18149 |
| This theorem is used by: (None) |
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