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Theorem homdmcoa 17974
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 2729 . . . 4 (Arrow‘𝐶) = (Arrow‘𝐶)
2 homdmcoa.h . . . 4 𝐻 = (Homa𝐶)
31, 2homarw 17953 . . 3 (𝑋𝐻𝑌) ⊆ (Arrow‘𝐶)
4 homdmcoa.f . . 3 (𝜑𝐹 ∈ (𝑋𝐻𝑌))
53, 4sselid 3933 . 2 (𝜑𝐹 ∈ (Arrow‘𝐶))
61, 2homarw 17953 . . 3 (𝑌𝐻𝑍) ⊆ (Arrow‘𝐶)
7 homdmcoa.g . . 3 (𝜑𝐺 ∈ (𝑌𝐻𝑍))
86, 7sselid 3933 . 2 (𝜑𝐺 ∈ (Arrow‘𝐶))
92homacd 17948 . . . 4 (𝐹 ∈ (𝑋𝐻𝑌) → (coda𝐹) = 𝑌)
104, 9syl 17 . . 3 (𝜑 → (coda𝐹) = 𝑌)
112homadm 17947 . . . 4 (𝐺 ∈ (𝑌𝐻𝑍) → (doma𝐺) = 𝑌)
127, 11syl 17 . . 3 (𝜑 → (doma𝐺) = 𝑌)
1310, 12eqtr4d 2767 . 2 (𝜑 → (coda𝐹) = (doma𝐺))
14 homdmcoa.o . . 3 · = (compa𝐶)
1514, 1eldmcoa 17972 . 2 (𝐺dom · 𝐹 ↔ (𝐹 ∈ (Arrow‘𝐶) ∧ 𝐺 ∈ (Arrow‘𝐶) ∧ (coda𝐹) = (doma𝐺)))
165, 8, 13, 15syl3anbrc 1344 1 (𝜑𝐺dom · 𝐹)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1540  wcel 2109   class class class wbr 5092  dom cdm 5619  cfv 6482  (class class class)co 7349  domacdoma 17927  codaccoda 17928  Arrowcarw 17929  Homachoma 17930  compaccoa 17961
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5218  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-reu 3344  df-rab 3395  df-v 3438  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-ot 4586  df-uni 4859  df-iun 4943  df-br 5093  df-opab 5155  df-mpt 5174  df-id 5514  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-iota 6438  df-fun 6484  df-fn 6485  df-f 6486  df-f1 6487  df-fo 6488  df-f1o 6489  df-fv 6490  df-ov 7352  df-oprab 7353  df-mpo 7354  df-1st 7924  df-2nd 7925  df-doma 17931  df-coda 17932  df-homa 17933  df-arw 17934  df-coa 17963
This theorem is referenced by: (None)
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