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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 2737 | . . . 4 ⊢ (Arrow‘𝐶) = (Arrow‘𝐶) | |
| 2 | homdmcoa.h | . . . 4 ⊢ 𝐻 = (Homa‘𝐶) | |
| 3 | 1, 2 | homarw 17984 | . . 3 ⊢ (𝑋𝐻𝑌) ⊆ (Arrow‘𝐶) |
| 4 | homdmcoa.f | . . 3 ⊢ (𝜑 → 𝐹 ∈ (𝑋𝐻𝑌)) | |
| 5 | 3, 4 | sselid 3933 | . 2 ⊢ (𝜑 → 𝐹 ∈ (Arrow‘𝐶)) |
| 6 | 1, 2 | homarw 17984 | . . 3 ⊢ (𝑌𝐻𝑍) ⊆ (Arrow‘𝐶) |
| 7 | homdmcoa.g | . . 3 ⊢ (𝜑 → 𝐺 ∈ (𝑌𝐻𝑍)) | |
| 8 | 6, 7 | sselid 3933 | . 2 ⊢ (𝜑 → 𝐺 ∈ (Arrow‘𝐶)) |
| 9 | 2 | homacd 17979 | . . . 4 ⊢ (𝐹 ∈ (𝑋𝐻𝑌) → (coda‘𝐹) = 𝑌) |
| 10 | 4, 9 | syl 17 | . . 3 ⊢ (𝜑 → (coda‘𝐹) = 𝑌) |
| 11 | 2 | homadm 17978 | . . . 4 ⊢ (𝐺 ∈ (𝑌𝐻𝑍) → (doma‘𝐺) = 𝑌) |
| 12 | 7, 11 | syl 17 | . . 3 ⊢ (𝜑 → (doma‘𝐺) = 𝑌) |
| 13 | 10, 12 | eqtr4d 2775 | . 2 ⊢ (𝜑 → (coda‘𝐹) = (doma‘𝐺)) |
| 14 | homdmcoa.o | . . 3 ⊢ · = (compa‘𝐶) | |
| 15 | 14, 1 | eldmcoa 18003 | . 2 ⊢ (𝐺dom · 𝐹 ↔ (𝐹 ∈ (Arrow‘𝐶) ∧ 𝐺 ∈ (Arrow‘𝐶) ∧ (coda‘𝐹) = (doma‘𝐺))) |
| 16 | 5, 8, 13, 15 | syl3anbrc 1345 | 1 ⊢ (𝜑 → 𝐺dom · 𝐹) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1542 ∈ wcel 2114 class class class wbr 5100 dom cdm 5634 ‘cfv 6502 (class class class)co 7370 domacdoma 17958 codaccoda 17959 Arrowcarw 17960 Homachoma 17961 compaccoa 17992 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5245 ax-nul 5255 ax-pow 5314 ax-pr 5381 ax-un 7692 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-ot 4591 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5529 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-iota 6458 df-fun 6504 df-fn 6505 df-f 6506 df-f1 6507 df-fo 6508 df-f1o 6509 df-fv 6510 df-ov 7373 df-oprab 7374 df-mpo 7375 df-1st 7945 df-2nd 7946 df-doma 17962 df-coda 17963 df-homa 17964 df-arw 17965 df-coa 17994 |
| This theorem is referenced by: (None) |
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