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Theorem mpteq1d 4203
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 4202 . 2  |-  ( A  =  B  ->  (
x  e.  A  |->  C )  =  ( x  e.  B  |->  C ) )
31, 2syl 15 1  |-  ( ph  ->  ( x  e.  A  |->  C )  =  ( x  e.  B  |->  C ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1647    e. cmpt 4179
This theorem is referenced by:  catidd  13792  cidpropd  13823  monpropd  13850  curfpropd  14217  off2  23457  esumnul  23908  measdivcst  24042
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1551  ax-5 1562  ax-17 1621  ax-9 1659  ax-8 1680  ax-6 1734  ax-7 1739  ax-11 1751  ax-12 1937  ax-ext 2347
This theorem depends on definitions:  df-bi 177  df-an 360  df-tru 1324  df-ex 1547  df-nf 1550  df-sb 1654  df-clab 2353  df-cleq 2359  df-clel 2362  df-ral 2633  df-opab 4180  df-mpt 4181
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