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Theorem mpteq12dv 4013
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 274 . 2  |-  ( (
ph  /\  x  e.  A )  ->  B  =  D )
41, 3mpteq12dva 4012 1  |-  ( ph  ->  ( x  e.  A  |->  B )  =  ( x  e.  C  |->  D ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1331    e. wcel 1480    |-> cmpt 3992
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-11 1484  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121
This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2126  df-cleq 2132  df-clel 2135  df-ral 2421  df-opab 3993  df-mpt 3994
This theorem is referenced by:  mpteq12i  4019  offval  5992  offval3  6035  restval  12152  ntrfval  12295  clsfval  12296  neifval  12335  cnpfval  12390  cnprcl2k  12401  reldvg  12843  dvfvalap  12845  eldvap  12846
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