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Theorem homdmcoa 18124
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 2769 . . . 4 (Arrow‘𝐶) = (Arrow‘𝐶)
2 homdmcoa.h . . . 4 𝐻 = (Homa𝐶)
31, 2homarw 18103 . . 3 (𝑋𝐻𝑌) ⊆ (Arrow‘𝐶)
4 homdmcoa.f . . 3 (𝜑𝐹 ∈ (𝑋𝐻𝑌))
53, 4sselid 3943 . 2 (𝜑𝐹 ∈ (Arrow‘𝐶))
61, 2homarw 18103 . . 3 (𝑌𝐻𝑍) ⊆ (Arrow‘𝐶)
7 homdmcoa.g . . 3 (𝜑𝐺 ∈ (𝑌𝐻𝑍))
86, 7sselid 3943 . 2 (𝜑𝐺 ∈ (Arrow‘𝐶))
92homacd 18098 . . . 4 (𝐹 ∈ (𝑋𝐻𝑌) → (coda𝐹) = 𝑌)
104, 9syl 18 . . 3 (𝜑 → (coda𝐹) = 𝑌)
112homadm 18097 . . . 4 (𝐺 ∈ (𝑌𝐻𝑍) → (doma𝐺) = 𝑌)
127, 11syl 18 . . 3 (𝜑 → (doma𝐺) = 𝑌)
1310, 12eqtr4d 2807 . 2 (𝜑 → (coda𝐹) = (doma𝐺))
14 homdmcoa.o . . 3 · = (compa𝐶)
1514, 1eldmcoa 18122 . 2 (𝐺dom · 𝐹 ↔ (𝐹 ∈ (Arrow‘𝐶) ∧ 𝐺 ∈ (Arrow‘𝐶) ∧ (coda𝐹) = (doma𝐺)))
165, 8, 13, 15syl3anbrc 1360 1 (𝜑𝐺dom · 𝐹)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1567  wcel 2149   class class class wbr 5113  dom cdm 5662  cfv 6537  (class class class)co 7411  domacdoma 18077  codaccoda 18078  Arrowcarw 18079  Homachoma 18080  compaccoa 18111
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-rep 5242  ax-sep 5261  ax-nul 5271  ax-pow 5337  ax-pr 5405  ax-un 7733
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-ral 3086  df-rex 3096  df-reu 3377  df-rab 3424  df-v 3465  df-sbc 3754  df-csb 3862  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-ot 4603  df-uni 4877  df-iun 4962  df-br 5114  df-opab 5178  df-mpt 5197  df-id 5557  df-xp 5668  df-rel 5669  df-cnv 5670  df-co 5671  df-dm 5672  df-rn 5673  df-res 5674  df-ima 5675  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 7414  df-oprab 7415  df-mpo 7416  df-1st 7986  df-2nd 7987  df-doma 18081  df-coda 18082  df-homa 18083  df-arw 18084  df-coa 18113
This theorem is referenced by: (None)
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