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Theorem homdmcoa 18005
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 2737 . . . 4 (Arrow‘𝐶) = (Arrow‘𝐶)
2 homdmcoa.h . . . 4 𝐻 = (Homa𝐶)
31, 2homarw 17984 . . 3 (𝑋𝐻𝑌) ⊆ (Arrow‘𝐶)
4 homdmcoa.f . . 3 (𝜑𝐹 ∈ (𝑋𝐻𝑌))
53, 4sselid 3933 . 2 (𝜑𝐹 ∈ (Arrow‘𝐶))
61, 2homarw 17984 . . 3 (𝑌𝐻𝑍) ⊆ (Arrow‘𝐶)
7 homdmcoa.g . . 3 (𝜑𝐺 ∈ (𝑌𝐻𝑍))
86, 7sselid 3933 . 2 (𝜑𝐺 ∈ (Arrow‘𝐶))
92homacd 17979 . . . 4 (𝐹 ∈ (𝑋𝐻𝑌) → (coda𝐹) = 𝑌)
104, 9syl 17 . . 3 (𝜑 → (coda𝐹) = 𝑌)
112homadm 17978 . . . 4 (𝐺 ∈ (𝑌𝐻𝑍) → (doma𝐺) = 𝑌)
127, 11syl 17 . . 3 (𝜑 → (doma𝐺) = 𝑌)
1310, 12eqtr4d 2775 . 2 (𝜑 → (coda𝐹) = (doma𝐺))
14 homdmcoa.o . . 3 · = (compa𝐶)
1514, 1eldmcoa 18003 . 2 (𝐺dom · 𝐹 ↔ (𝐹 ∈ (Arrow‘𝐶) ∧ 𝐺 ∈ (Arrow‘𝐶) ∧ (coda𝐹) = (doma𝐺)))
165, 8, 13, 15syl3anbrc 1345 1 (𝜑𝐺dom · 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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