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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 2741 | . . . 4 ⊢ (Arrow‘𝐶) = (Arrow‘𝐶) | |
| 2 | homdmcoa.h | . . . 4 ⊢ 𝐻 = (Homa‘𝐶) | |
| 3 | 1, 2 | homarw 18008 | . . 3 ⊢ (𝑋𝐻𝑌) ⊆ (Arrow‘𝐶) |
| 4 | homdmcoa.f | . . 3 ⊢ (𝜑 → 𝐹 ∈ (𝑋𝐻𝑌)) | |
| 5 | 3, 4 | sselid 3915 | . 2 ⊢ (𝜑 → 𝐹 ∈ (Arrow‘𝐶)) |
| 6 | 1, 2 | homarw 18008 | . . 3 ⊢ (𝑌𝐻𝑍) ⊆ (Arrow‘𝐶) |
| 7 | homdmcoa.g | . . 3 ⊢ (𝜑 → 𝐺 ∈ (𝑌𝐻𝑍)) | |
| 8 | 6, 7 | sselid 3915 | . 2 ⊢ (𝜑 → 𝐺 ∈ (Arrow‘𝐶)) |
| 9 | 2 | homacd 18003 | . . . 4 ⊢ (𝐹 ∈ (𝑋𝐻𝑌) → (coda‘𝐹) = 𝑌) |
| 10 | 4, 9 | syl 17 | . . 3 ⊢ (𝜑 → (coda‘𝐹) = 𝑌) |
| 11 | 2 | homadm 18002 | . . . 4 ⊢ (𝐺 ∈ (𝑌𝐻𝑍) → (doma‘𝐺) = 𝑌) |
| 12 | 7, 11 | syl 17 | . . 3 ⊢ (𝜑 → (doma‘𝐺) = 𝑌) |
| 13 | 10, 12 | eqtr4d 2779 | . 2 ⊢ (𝜑 → (coda‘𝐹) = (doma‘𝐺)) |
| 14 | homdmcoa.o | . . 3 ⊢ · = (compa‘𝐶) | |
| 15 | 14, 1 | eldmcoa 18027 | . 2 ⊢ (𝐺dom · 𝐹 ↔ (𝐹 ∈ (Arrow‘𝐶) ∧ 𝐺 ∈ (Arrow‘𝐶) ∧ (coda‘𝐹) = (doma‘𝐺))) |
| 16 | 5, 8, 13, 15 | syl3anbrc 1351 | 1 ⊢ (𝜑 → 𝐺dom · 𝐹) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1548 ∈ wcel 2121 class class class wbr 5075 dom cdm 5621 ‘cfv 6489 (class class class)co 7360 domacdoma 17982 codaccoda 17983 Arrowcarw 17984 Homachoma 17985 compaccoa 18016 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-10 2154 ax-11 2170 ax-12 2191 ax-ext 2713 ax-rep 5202 ax-sep 5221 ax-nul 5231 ax-pow 5297 ax-pr 5365 ax-un 7682 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-nf 1792 df-sb 2075 df-mo 2545 df-eu 2575 df-clab 2720 df-cleq 2733 df-clel 2816 df-nfc 2890 df-ne 2937 df-ral 3056 df-rex 3066 df-reu 3347 df-rab 3394 df-v 3435 df-sbc 3726 df-csb 3834 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-nul 4265 df-if 4458 df-pw 4534 df-sn 4559 df-pr 4561 df-op 4565 df-ot 4567 df-uni 4842 df-iun 4926 df-br 5076 df-opab 5138 df-mpt 5157 df-id 5516 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-iota 6445 df-fun 6491 df-fn 6492 df-f 6493 df-f1 6494 df-fo 6495 df-f1o 6496 df-fv 6497 df-ov 7363 df-oprab 7364 df-mpo 7365 df-1st 7935 df-2nd 7936 df-doma 17986 df-coda 17987 df-homa 17988 df-arw 17989 df-coa 18018 |
| This theorem is referenced by: (None) |
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