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Theorem homdmcoa 18242
Description: If 𝐹:𝑋⟶𝑌 and 𝐺:𝑌⟶𝑍, then 𝐺 and 𝐹 are composable. (Contributed by Mario Carneiro, 11-Jan-2017.)
Hypotheses
Ref Expression
homdmcoa.o · = (compa‘𝐶)
homdmcoa.h 𝐻 = (Homa‘𝐶)
homdmcoa.f (𝜑 → 𝐹 ∈ (𝑋𝐻𝑌))
homdmcoa.g (𝜑 → 𝐺 ∈ (𝑌𝐻𝑍))
Assertion
Ref Expression
homdmcoa (𝜑 → 𝐺dom · 𝐹)

Proof of Theorem homdmcoa
StepHypRef Expression
1 eqid 2760 . . . 4 (Arrow‘𝐶) = (Arrow‘𝐶)
2 homdmcoa.h . . . 4 𝐻 = (Homa‘𝐶)
31, 2homarw 18221 . . 3 (𝑋𝐻𝑌) ⊆ (Arrow‘𝐶)
4 homdmcoa.f . . 3 (𝜑 → 𝐹 ∈ (𝑋𝐻𝑌))
53, 4sselid 3906 . 2 (𝜑 → 𝐹 ∈ (Arrow‘𝐶))
61, 2homarw 18221 . . 3 (𝑌𝐻𝑍) ⊆ (Arrow‘𝐶)
7 homdmcoa.g . . 3 (𝜑 → 𝐺 ∈ (𝑌𝐻𝑍))
86, 7sselid 3906 . 2 (𝜑 → 𝐺 ∈ (Arrow‘𝐶))
92homacd 18216 . . . 4 (𝐹 ∈ (𝑋𝐻𝑌) → (coda‘𝐹) = 𝑌)
104, 9syl 18 . . 3 (𝜑 → (coda‘𝐹) = 𝑌)
112homadm 18215 . . . 4 (𝐺 ∈ (𝑌𝐻𝑍) → (doma‘𝐺) = 𝑌)
127, 11syl 18 . . 3 (𝜑 → (doma‘𝐺) = 𝑌)
1310, 12eqtr4d 2798 . 2 (𝜑 → (coda‘𝐹) = (doma‘𝐺))
14 homdmcoa.o . . 3 · = (compa‘𝐶)
1514, 1eldmcoa 18240 . 2 (𝐺dom · 𝐹 ↔ (𝐹 ∈ (Arrow‘𝐶) ∧ 𝐺 ∈ (Arrow‘𝐶) ∧ (coda‘𝐹) = (doma‘𝐺)))
165, 8, 13, 15syl3anbrc 1362 1 (𝜑 → 𝐺dom · 𝐹)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1569   ∈ wcel 2144   class class class wbr 5102  dom cdm 5650  ‘cfv 6538  (class class class)co 7420  domacdoma 18195  codaccoda 18196  Arrowcarw 18197  Homachoma 18198  compaccoa 18229
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pow 5326  ax-pr 5390  ax-un 7751
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-op 4590  df-ot 4592  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-f1 6543  df-fo 6544  df-f1o 6545  df-fv 6546  df-ov 7423  df-oprab 7424  df-mpo 7425  df-1st 8001  df-2nd 8002  df-doma 18199  df-coda 18200  df-homa 18201  df-arw 18202  df-coa 18231
This theorem is used by: (None)
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