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Theorem homdmcoa 18102
Description: If 𝐹:𝑋𝑌 and 𝐺:𝑌𝑍, then 𝐺 and 𝐹 are composable. (Contributed by Mario Carneiro, 11-Jan-2017.)
Hypotheses
Ref Expression
homdmcoa.o · = (compa𝐶)
homdmcoa.h 𝐻 = (Homa𝐶)
homdmcoa.f (𝜑𝐹 ∈ (𝑋𝐻𝑌))
homdmcoa.g (𝜑𝐺 ∈ (𝑌𝐻𝑍))
Assertion
Ref Expression
homdmcoa (𝜑𝐺dom · 𝐹)

Proof of Theorem homdmcoa
StepHypRef Expression
1 eqid 2764 . . . 4 (Arrow‘𝐶) = (Arrow‘𝐶)
2 homdmcoa.h . . . 4 𝐻 = (Homa𝐶)
31, 2homarw 18081 . . 3 (𝑋𝐻𝑌) ⊆ (Arrow‘𝐶)
4 homdmcoa.f . . 3 (𝜑𝐹 ∈ (𝑋𝐻𝑌))
53, 4sselid 3936 . 2 (𝜑𝐹 ∈ (Arrow‘𝐶))
61, 2homarw 18081 . . 3 (𝑌𝐻𝑍) ⊆ (Arrow‘𝐶)
7 homdmcoa.g . . 3 (𝜑𝐺 ∈ (𝑌𝐻𝑍))
86, 7sselid 3936 . 2 (𝜑𝐺 ∈ (Arrow‘𝐶))
92homacd 18076 . . . 4 (𝐹 ∈ (𝑋𝐻𝑌) → (coda𝐹) = 𝑌)
104, 9syl 17 . . 3 (𝜑 → (coda𝐹) = 𝑌)
112homadm 18075 . . . 4 (𝐺 ∈ (𝑌𝐻𝑍) → (doma𝐺) = 𝑌)
127, 11syl 17 . . 3 (𝜑 → (doma𝐺) = 𝑌)
1310, 12eqtr4d 2802 . 2 (𝜑 → (coda𝐹) = (doma𝐺))
14 homdmcoa.o . . 3 · = (compa𝐶)
1514, 1eldmcoa 18100 . 2 (𝐺dom · 𝐹 ↔ (𝐹 ∈ (Arrow‘𝐶) ∧ 𝐺 ∈ (Arrow‘𝐶) ∧ (coda𝐹) = (doma𝐺)))
165, 8, 13, 15syl3anbrc 1358 1 (𝜑𝐺dom · 𝐹)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1562  wcel 2144   class class class wbr 5102  dom cdm 5649  cfv 6523  (class class class)co 7398  domacdoma 18055  codaccoda 18056  Arrowcarw 18057  Homachoma 18058  compaccoa 18089
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1817  ax-4 1831  ax-5 1932  ax-6 1989  ax-7 2030  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2214  ax-ext 2736  ax-rep 5229  ax-sep 5248  ax-nul 5258  ax-pow 5324  ax-pr 5392  ax-un 7720
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1101  df-tru 1565  df-fal 1575  df-ex 1802  df-nf 1806  df-sb 2093  df-mo 2568  df-eu 2598  df-clab 2743  df-cleq 2756  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3079  df-rex 3089  df-reu 3370  df-rab 3417  df-v 3458  df-sbc 3747  df-csb 3855  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-ot 4593  df-uni 4868  df-iun 4953  df-br 5103  df-opab 5165  df-mpt 5184  df-id 5544  df-xp 5655  df-rel 5656  df-cnv 5657  df-co 5658  df-dm 5659  df-rn 5660  df-res 5661  df-ima 5662  df-iota 6479  df-fun 6525  df-fn 6526  df-f 6527  df-f1 6528  df-fo 6529  df-f1o 6530  df-fv 6531  df-ov 7401  df-oprab 7402  df-mpo 7403  df-1st 7972  df-2nd 7973  df-doma 18059  df-coda 18060  df-homa 18061  df-arw 18062  df-coa 18091
This theorem is referenced by: (None)
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