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Theorem mpteq12dv 3839
Description: An equality inference for the maps to notation. (Contributed by NM, 24-Aug-2011.) (Revised by Mario Carneiro, 16-Dec-2013.)
Hypotheses
Ref Expression
mpteq12dv.1  |-  ( ph  ->  A  =  C )
mpteq12dv.2  |-  ( ph  ->  B  =  D )
Assertion
Ref Expression
mpteq12dv  |-  ( ph  ->  ( x  e.  A  |->  B )  =  ( x  e.  C  |->  D ) )
Distinct variable group:    ph, x
Allowed substitution hints:    A( x)    B( x)    C( x)    D( x)

Proof of Theorem mpteq12dv
StepHypRef Expression
1 mpteq12dv.1 . 2  |-  ( ph  ->  A  =  C )
2 mpteq12dv.2 . . 3  |-  ( ph  ->  B  =  D )
32adantr 261 . 2  |-  ( (
ph  /\  x  e.  A )  ->  B  =  D )
41, 3mpteq12dva 3838 1  |-  ( ph  ->  ( x  e.  A  |->  B )  =  ( x  e.  C  |->  D ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1243    e. wcel 1393    |-> 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:  mpteq12i  3845  offval  5719  offval3  5761
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