Theorem fvmptg 5269

Description: Value of a function given in maps-to notation. (Contributed by NM, 2-Oct-2007.) (Revised by Mario Carneiro, 31-Aug-2015.)

Hypotheses

Ref	Expression
fvmptg.1	|- ( x = A -> B = C )
fvmptg.2	|- F = ( x e. D |-> B )

Assertion

Ref	Expression
fvmptg	|- ( ( A e. D /\ C e. R ) -> ( F ` A ) = C )

Distinct variable groups:   x, A   x, C   x, D

Allowed substitution hints:   B( x)   R( x)   F( x)

Proof of Theorem fvmptg

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2081	. 2 |- C = C
2		fvmptg.1	. . . 4 |- ( x = A -> B = C )
3	2	eqeq2d 2092	. . 3 |- ( x = A -> ( y = B <-> y = C ) )
4		eqeq1 2087	. . 3 |- ( y = C -> ( y = C <-> C = C ) )
5		moeq 2767	. . . 4 |- E* y y = B
6	5	a1i 9	. . 3 |- ( x e. D -> E* y y = B )
7		fvmptg.2	. . . 4 |- F = ( x e. D |-> B )
8		df-mpt 3841	. . . 4 |- ( x e. D |-> B ) = { <. x , y >. | ( x e. D /\ y = B ) }
9	7, 8	eqtri 2101	. . 3 |- F = { <. x , y >. | ( x e. D /\ y = B ) }
10	3, 4, 6, 9	fvopab3ig 5267	. 2 |- ( ( A e. D /\ C e. R ) -> ( C = C -> ( F ` A ) = C ) )
11	1, 10	mpi 15	1 |- ( ( A e. D /\ C e. R ) -> ( F ` A ) = C )

Syntax hints:   -> wi 4   /\ wa 102   = wceq 1284   e. wcel 1433   E*wmo 1942   {copab 3838   |-> cmpt 3839   ` cfv 4922

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 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-14 1445  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-sep 3896  ax-pow 3948  ax-pr 3964

This theorem depends on definitions:  df-bi 115  df-3an 921  df-tru 1287  df-nf 1390  df-sb 1686  df-eu 1944  df-mo 1945  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ral 2353  df-rex 2354  df-v 2603  df-sbc 2816  df-un 2977  df-in 2979  df-ss 2986  df-pw 3384  df-sn 3404  df-pr 3405  df-op 3407  df-uni 3602  df-br 3786  df-opab 3840  df-mpt 3841  df-id 4048  df-xp 4369  df-rel 4370  df-cnv 4371  df-co 4372  df-dm 4373  df-iota 4887  df-fun 4924  df-fv 4930

This theorem is referenced by:  fvmpt  5270  fvmpts  5271  fvmpt3  5272  fvmpt2  5275  f1mpt  5431  fnofval  5741  caofinvl  5753  1stvalg  5789  2ndvalg  5790  brtpos2  5889  frec0g  6006  frecsuclem3  6013  sucinc  6048  sucinc2  6049  omcl  6064  oeicl  6065  oav2  6066  omv2  6068  cardval3ex  6454  ceilqval  9308  monoord2  9456  iseqdistr  9470  serile  9474  cjval  9732  reval  9736  imval  9737  cvg1nlemcau  9870  cvg1nlemres  9871  absval  9887  resqrexlemglsq  9908  resqrexlemga  9909  climmpt  10139  climle  10172  climcvg1nlem  10186