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Theorem fvco 6274
Description: Value of a function composition. Similar to Exercise 5 of [TakeutiZaring] p. 28. (Contributed by NM, 22-Apr-2006.) (Proof shortened by Mario Carneiro, 26-Dec-2014.)
Assertion
Ref Expression
fvco ((Fun 𝐺𝐴 ∈ dom 𝐺) → ((𝐹𝐺)‘𝐴) = (𝐹‘(𝐺𝐴)))

Proof of Theorem fvco
StepHypRef Expression
1 funfn 5918 . 2 (Fun 𝐺𝐺 Fn dom 𝐺)
2 fvco2 6273 . 2 ((𝐺 Fn dom 𝐺𝐴 ∈ dom 𝐺) → ((𝐹𝐺)‘𝐴) = (𝐹‘(𝐺𝐴)))
31, 2sylanb 489 1 ((Fun 𝐺𝐴 ∈ dom 𝐺) → ((𝐹𝐺)‘𝐴) = (𝐹‘(𝐺𝐴)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 384   = wceq 1483  wcel 1990  dom cdm 5114  ccom 5118  Fun wfun 5882   Fn wfn 5883  cfv 5888
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-fv 5896
This theorem is referenced by:  fin23lem30  9164  hashkf  13119  hashgval  13120  gsumpropd2lem  17273  ofco2  20257  opfv  29448  xppreima  29449  psgnfzto1stlem  29850  smatlem  29863  mdetpmtr1  29889  madjusmdetlem2  29894  madjusmdetlem4  29896  eulerpartlemgvv  30438  eulerpartlemgu  30439  sseqfv2  30456  reprpmtf1o  30704  hgt750lemg  30732  comptiunov2i  37998  choicefi  39392  fvcod  39423  evthiccabs  39718  cncficcgt0  40101  dvsinax  40127  fvvolioof  40206  fvvolicof  40208  stirlinglem14  40304  fourierdlem42  40366  hoicvr  40762  hoi2toco  40821  ovolval3  40861  ovolval4lem1  40863  ovnovollem1  40870  ovnovollem2  40871
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