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Theorem fvmpt2 5726
Description: Value of a function given by the maps-to notation. (Contributed by FL, 21-Jun-2010.)
Hypothesis
Ref Expression
fvmpt2.1  |-  F  =  ( x  e.  A  |->  B )
Assertion
Ref Expression
fvmpt2  |-  ( ( x  e.  A  /\  B  e.  C )  ->  ( F `  x
)  =  B )
Distinct variable group:    x, A
Allowed substitution hints:    B( x)    C( x)    F( x)

Proof of Theorem fvmpt2
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 csbeq1 3128 . . 3  |-  ( y  =  x  ->  [_ y  /  x ]_ B  = 
[_ x  /  x ]_ B )
2 csbid 3133 . . 3  |-  [_ x  /  x ]_ B  =  B
31, 2eqtrdi 2278 . 2  |-  ( y  =  x  ->  [_ y  /  x ]_ B  =  B )
4 fvmpt2.1 . . 3  |-  F  =  ( x  e.  A  |->  B )
5 nfcv 2372 . . . 4  |-  F/_ y B
6 nfcsb1v 3158 . . . 4  |-  F/_ x [_ y  /  x ]_ B
7 csbeq1a 3134 . . . 4  |-  ( x  =  y  ->  B  =  [_ y  /  x ]_ B )
85, 6, 7cbvmpt 4182 . . 3  |-  ( x  e.  A  |->  B )  =  ( y  e.  A  |->  [_ y  /  x ]_ B )
94, 8eqtri 2250 . 2  |-  F  =  ( y  e.  A  |-> 
[_ y  /  x ]_ B )
103, 9fvmptg 5718 1  |-  ( ( x  e.  A  /\  B  e.  C )  ->  ( F `  x
)  =  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1395    e. wcel 2200   [_csb 3125    |-> cmpt 4148   ` cfv 5324
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-pow 4262  ax-pr 4297
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2802  df-sbc 3030  df-csb 3126  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-br 4087  df-opab 4149  df-mpt 4150  df-id 4388  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-iota 5284  df-fun 5326  df-fv 5332
This theorem is referenced by:  fvmptssdm  5727  fvmpt2d  5729  fvmptdf  5730  mpteqb  5733  fvmptt  5734  fvmptf  5735  fnmptfvd  5747  ralrnmpt  5785  rexrnmpt  5786  fmptco  5809  f1mpt  5907  offval2  6246  ofrfval2  6247  mptelixpg  6898  dom2lem  6940  mapxpen  7029  xpmapenlem  7030  mkvprop  7348  cc2lem  7475  cc3  7477  fsum3cvg  11929  summodclem2a  11932  fsumf1o  11941  fsum3cvg2  11945  fsumadd  11957  isummulc2  11977  fproddccvg  12123  fprodf1o  12139  prdsbas3  13360  txcnp  14985  cnmpt11  14997  cnmpt1t  14999  elplyd  15455  dvply1  15479  lgseisenlem2  15790
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