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Theorem fco2 6735
Description: Functionality of a composition with weakened out of domain condition on the first argument. (Contributed by Stefan O'Rear, 11-Mar-2015.)
Assertion
Ref Expression
fco2 (((𝐹𝐵):𝐵𝐶𝐺:𝐴𝐵) → (𝐹𝐺):𝐴𝐶)

Proof of Theorem fco2
StepHypRef Expression
1 fco 6732 . 2 (((𝐹𝐵):𝐵𝐶𝐺:𝐴𝐵) → ((𝐹𝐵) ∘ 𝐺):𝐴𝐶)
2 frn 6715 . . . . 5 (𝐺:𝐴𝐵 → ran 𝐺𝐵)
3 cores 6239 . . . . 5 (ran 𝐺𝐵 → ((𝐹𝐵) ∘ 𝐺) = (𝐹𝐺))
42, 3syl 17 . . . 4 (𝐺:𝐴𝐵 → ((𝐹𝐵) ∘ 𝐺) = (𝐹𝐺))
54adantl 481 . . 3 (((𝐹𝐵):𝐵𝐶𝐺:𝐴𝐵) → ((𝐹𝐵) ∘ 𝐺) = (𝐹𝐺))
65feq1d 6693 . 2 (((𝐹𝐵):𝐵𝐶𝐺:𝐴𝐵) → (((𝐹𝐵) ∘ 𝐺):𝐴𝐶 ↔ (𝐹𝐺):𝐴𝐶))
71, 6mpbid 231 1 (((𝐹𝐵):𝐵𝐶𝐺:𝐴𝐵) → (𝐹𝐺):𝐴𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1533  wss 3941  ran crn 5668  cres 5669  ccom 5671  wf 6530
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2163  ax-ext 2695  ax-sep 5290  ax-nul 5297  ax-pr 5418
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2526  df-eu 2555  df-clab 2702  df-cleq 2716  df-clel 2802  df-nfc 2877  df-ral 3054  df-rex 3063  df-rab 3425  df-v 3468  df-dif 3944  df-un 3946  df-in 3948  df-ss 3958  df-nul 4316  df-if 4522  df-sn 4622  df-pr 4624  df-op 4628  df-br 5140  df-opab 5202  df-id 5565  df-xp 5673  df-rel 5674  df-cnv 5675  df-co 5676  df-dm 5677  df-rn 5678  df-res 5679  df-ima 5680  df-fun 6536  df-fn 6537  df-f 6538
This theorem is referenced by:  fsuppcor  9396  prdsrngd  20073  prdsringd  20212  prdscrngd  20213  prds1  20214  prdstmdd  23952  prdsxmslem2  24362  eulerpartlemmf  33866  sseqf  33883  poimirlem9  36991  ftc1anclem3  37057  fco2d  43428
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