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Theorem fco 5161
Description: Composition of two mappings. (Contributed by NM, 29-Aug-1999.) (Proof shortened by Andrew Salmon, 17-Sep-2011.)
Assertion
Ref Expression
fco ((𝐹:𝐵𝐶𝐺:𝐴𝐵) → (𝐹𝐺):𝐴𝐶)

Proof of Theorem fco
StepHypRef Expression
1 df-f 5006 . . 3 (𝐹:𝐵𝐶 ↔ (𝐹 Fn 𝐵 ∧ ran 𝐹𝐶))
2 df-f 5006 . . 3 (𝐺:𝐴𝐵 ↔ (𝐺 Fn 𝐴 ∧ ran 𝐺𝐵))
3 fnco 5108 . . . . . . 7 ((𝐹 Fn 𝐵𝐺 Fn 𝐴 ∧ ran 𝐺𝐵) → (𝐹𝐺) Fn 𝐴)
433expib 1146 . . . . . 6 (𝐹 Fn 𝐵 → ((𝐺 Fn 𝐴 ∧ ran 𝐺𝐵) → (𝐹𝐺) Fn 𝐴))
54adantr 270 . . . . 5 ((𝐹 Fn 𝐵 ∧ ran 𝐹𝐶) → ((𝐺 Fn 𝐴 ∧ ran 𝐺𝐵) → (𝐹𝐺) Fn 𝐴))
6 rncoss 4691 . . . . . . 7 ran (𝐹𝐺) ⊆ ran 𝐹
7 sstr 3031 . . . . . . 7 ((ran (𝐹𝐺) ⊆ ran 𝐹 ∧ ran 𝐹𝐶) → ran (𝐹𝐺) ⊆ 𝐶)
86, 7mpan 415 . . . . . 6 (ran 𝐹𝐶 → ran (𝐹𝐺) ⊆ 𝐶)
98adantl 271 . . . . 5 ((𝐹 Fn 𝐵 ∧ ran 𝐹𝐶) → ran (𝐹𝐺) ⊆ 𝐶)
105, 9jctird 310 . . . 4 ((𝐹 Fn 𝐵 ∧ ran 𝐹𝐶) → ((𝐺 Fn 𝐴 ∧ ran 𝐺𝐵) → ((𝐹𝐺) Fn 𝐴 ∧ ran (𝐹𝐺) ⊆ 𝐶)))
1110imp 122 . . 3 (((𝐹 Fn 𝐵 ∧ ran 𝐹𝐶) ∧ (𝐺 Fn 𝐴 ∧ ran 𝐺𝐵)) → ((𝐹𝐺) Fn 𝐴 ∧ ran (𝐹𝐺) ⊆ 𝐶))
121, 2, 11syl2anb 285 . 2 ((𝐹:𝐵𝐶𝐺:𝐴𝐵) → ((𝐹𝐺) Fn 𝐴 ∧ ran (𝐹𝐺) ⊆ 𝐶))
13 df-f 5006 . 2 ((𝐹𝐺):𝐴𝐶 ↔ ((𝐹𝐺) Fn 𝐴 ∧ ran (𝐹𝐺) ⊆ 𝐶))
1412, 13sylibr 132 1 ((𝐹:𝐵𝐶𝐺:𝐴𝐵) → (𝐹𝐺):𝐴𝐶)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 102  wss 2997  ran crn 4429  ccom 4432   Fn wfn 4997  wf 4998
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-14 1450  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070  ax-sep 3949  ax-pow 4001  ax-pr 4027
This theorem depends on definitions:  df-bi 115  df-3an 926  df-tru 1292  df-nf 1395  df-sb 1693  df-eu 1951  df-mo 1952  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-ral 2364  df-rex 2365  df-v 2621  df-un 3001  df-in 3003  df-ss 3010  df-pw 3427  df-sn 3447  df-pr 3448  df-op 3450  df-br 3838  df-opab 3892  df-id 4111  df-xp 4434  df-rel 4435  df-cnv 4436  df-co 4437  df-dm 4438  df-rn 4439  df-fun 5004  df-fn 5005  df-f 5006
This theorem is referenced by:  fco2  5162  f1co  5212  foco  5227  mapen  6542  enomnilem  6773  fnn0nninf  9808  fsumcl2lem  10755  fsumadd  10763  ialgcvg  11112
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