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Theorem cbvmptv 3899
Description: Rule to change the bound variable in a maps-to function, using implicit substitution. (Contributed by Mario Carneiro, 19-Feb-2013.)
Hypothesis
Ref Expression
cbvmptv.1  |-  ( x  =  y  ->  B  =  C )
Assertion
Ref Expression
cbvmptv  |-  ( x  e.  A  |->  B )  =  ( y  e.  A  |->  C )
Distinct variable groups:    x, A    y, A    y, B    x, C
Allowed substitution hints:    B( x)    C( y)

Proof of Theorem cbvmptv
StepHypRef Expression
1 nfcv 2223 . 2  |-  F/_ y B
2 nfcv 2223 . 2  |-  F/_ x C
3 cbvmptv.1 . 2  |-  ( x  =  y  ->  B  =  C )
41, 2, 3cbvmpt 3898 1  |-  ( x  e.  A  |->  B )  =  ( y  e.  A  |->  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1285    |-> cmpt 3865
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 663  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-10 1437  ax-11 1438  ax-i12 1439  ax-bndl 1440  ax-4 1441  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2065
This theorem depends on definitions:  df-bi 115  df-3an 922  df-tru 1288  df-nf 1391  df-sb 1688  df-clab 2070  df-cleq 2076  df-clel 2079  df-nfc 2212  df-v 2614  df-un 2988  df-sn 3428  df-pr 3429  df-op 3431  df-opab 3866  df-mpt 3867
This theorem is referenced by:  frecsuc  6104  xpmapen  6496  fodjuomni  6709  caucvgsrlembnd  7249  negiso  8310  infrenegsupex  8977  frec2uzsucd  9697  frecuzrdgdom  9714  frecuzrdgfun  9716  frecuzrdgsuct  9720  0tonninf  9734  1tonninf  9735  hashfz1  10026  climcvg1n  10561  phimullem  10981
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