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Theorem mpteq2ia 4219
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 2238 . . 3  |-  A  =  A
21ax-gen 1502 . 2  |-  A. x  A  =  A
3 mpteq2ia.1 . . 3  |-  ( x  e.  A  ->  B  =  C )
43rgen 2603 . 2  |-  A. x  e.  A  B  =  C
5 mpteq12f 4212 . 2  |-  ( ( A. x  A  =  A  /\  A. x  e.  A  B  =  C )  ->  (
x  e.  A  |->  B )  =  ( x  e.  A  |->  C ) )
62, 4, 5mp2an 430 1  |-  ( x  e.  A  |->  B )  =  ( x  e.  A  |->  C )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4   A.wal 1400    = wceq 1402    e. wcel 2209   A.wral 2528    |-> cmpt 4193
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-11 1559  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-ral 2533  df-opab 4194  df-mpt 4195
This theorem is used by:  mpteq2i  4220  feqresmpt  5760  elfvmptrab  5805  fmptap  5908  offres  6372  cnrecnv  11698  ege2le3  12463  eirraplem  12569  gsum2dfilem2  14272  cnmpt1st  15514  cnmpt2nd  15515  expcn  15795  expcncf  15835  dvexp  15937  dveflem  15952  dvef  15953  elply2  15961  plyid  15972  chtublem  16295  bposlem6  16316
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