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Theorem dmmptd 5209
Description: The domain of the mapping operation, deduction form. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
Hypotheses
Ref Expression
dmmptd.a  |-  A  =  ( x  e.  B  |->  C )
dmmptd.c  |-  ( (
ph  /\  x  e.  B )  ->  C  e.  V )
Assertion
Ref Expression
dmmptd  |-  ( ph  ->  dom  A  =  B )
Distinct variable groups:    x, B    ph, x
Allowed substitution hints:    A( x)    C( x)    V( x)

Proof of Theorem dmmptd
StepHypRef Expression
1 dmmptd.c . . . . 5  |-  ( (
ph  /\  x  e.  B )  ->  C  e.  V )
21elexd 2668 . . . 4  |-  ( (
ph  /\  x  e.  B )  ->  C  e.  _V )
32ralrimiva 2477 . . 3  |-  ( ph  ->  A. x  e.  B  C  e.  _V )
4 rabid2 2579 . . 3  |-  ( B  =  { x  e.  B  |  C  e. 
_V }  <->  A. x  e.  B  C  e.  _V )
53, 4sylibr 133 . 2  |-  ( ph  ->  B  =  { x  e.  B  |  C  e.  _V } )
6 dmmptd.a . . 3  |-  A  =  ( x  e.  B  |->  C )
76dmmpt 4990 . 2  |-  dom  A  =  { x  e.  B  |  C  e.  _V }
85, 7syl6reqr 2164 1  |-  ( ph  ->  dom  A  =  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    = wceq 1312    e. wcel 1461   A.wral 2388   {crab 2392   _Vcvv 2655    |-> cmpt 3947   dom cdm 4497
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 681  ax-5 1404  ax-7 1405  ax-gen 1406  ax-ie1 1450  ax-ie2 1451  ax-8 1463  ax-10 1464  ax-11 1465  ax-i12 1466  ax-bndl 1467  ax-4 1468  ax-14 1473  ax-17 1487  ax-i9 1491  ax-ial 1495  ax-i5r 1496  ax-ext 2095  ax-sep 4004  ax-pow 4056  ax-pr 4089
This theorem depends on definitions:  df-bi 116  df-3an 945  df-tru 1315  df-nf 1418  df-sb 1717  df-eu 1976  df-mo 1977  df-clab 2100  df-cleq 2106  df-clel 2109  df-nfc 2242  df-ral 2393  df-rex 2394  df-rab 2397  df-v 2657  df-un 3039  df-in 3041  df-ss 3048  df-pw 3476  df-sn 3497  df-pr 3498  df-op 3500  df-br 3894  df-opab 3948  df-mpt 3949  df-xp 4503  df-rel 4504  df-cnv 4505  df-dm 4507  df-rn 4508  df-res 4509  df-ima 4510
This theorem is referenced by:  limccnp2cntop  12596
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