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Theorem mpteq2ia 4104
Description: An equality inference for the maps-to notation. (Contributed by Mario Carneiro, 16-Dec-2013.)
Hypothesis
Ref Expression
mpteq2ia.1  |-  ( x  e.  A  ->  B  =  C )
Assertion
Ref Expression
mpteq2ia  |-  ( x  e.  A  |->  B )  =  ( x  e.  A  |->  C )

Proof of Theorem mpteq2ia
StepHypRef Expression
1 eqid 2189 . . 3  |-  A  =  A
21ax-gen 1460 . 2  |-  A. x  A  =  A
3 mpteq2ia.1 . . 3  |-  ( x  e.  A  ->  B  =  C )
43rgen 2543 . 2  |-  A. x  e.  A  B  =  C
5 mpteq12f 4098 . 2  |-  ( ( A. x  A  =  A  /\  A. x  e.  A  B  =  C )  ->  (
x  e.  A  |->  B )  =  ( x  e.  A  |->  C ) )
62, 4, 5mp2an 426 1  |-  ( x  e.  A  |->  B )  =  ( x  e.  A  |->  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4   A.wal 1362    = wceq 1364    e. wcel 2160   A.wral 2468    |-> cmpt 4079
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-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-11 1517  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-ext 2171
This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2176  df-cleq 2182  df-clel 2185  df-ral 2473  df-opab 4080  df-mpt 4081
This theorem is referenced by:  mpteq2i  4105  feqresmpt  5586  elfvmptrab  5627  fmptap  5722  offres  6154  cnrecnv  10937  ege2le3  11697  eirraplem  11802  cnmpt1st  14185  cnmpt2nd  14186  expcncf  14489  dvexp  14572  dveflem  14584  dvef  14585
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