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Theorem mpteq1d 3842
Description: An equality theorem for the maps to notation. (Contributed by Mario Carneiro, 11-Jun-2016.)
Hypothesis
Ref Expression
mpteq1d.1  |-  ( ph  ->  A  =  B )
Assertion
Ref Expression
mpteq1d  |-  ( ph  ->  ( x  e.  A  |->  C )  =  ( x  e.  B  |->  C ) )
Distinct variable groups:    x, A    x, B
Allowed substitution hints:    ph( x)    C( x)

Proof of Theorem mpteq1d
StepHypRef Expression
1 mpteq1d.1 . 2  |-  ( ph  ->  A  =  B )
2 mpteq1 3841 . 2  |-  ( A  =  B  ->  (
x  e.  A  |->  C )  =  ( x  e.  B  |->  C ) )
31, 2syl 14 1  |-  ( ph  ->  ( x  e.  A  |->  C )  =  ( x  e.  B  |->  C ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1243    |-> cmpt 3818
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-11 1397  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022
This theorem depends on definitions:  df-bi 110  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-ral 2311  df-opab 3819  df-mpt 3820
This theorem is referenced by:  fmptapd  5354  offval  5719
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