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Theorem dmmptd 5489
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.a . . 3  |-  A  =  ( x  e.  B  |->  C )
21dmmpt 5258 . 2  |-  dom  A  =  { x  e.  B  |  C  e.  _V }
3 dmmptd.c . . . . 5  |-  ( (
ph  /\  x  e.  B )  ->  C  e.  V )
43elexd 2827 . . . 4  |-  ( (
ph  /\  x  e.  B )  ->  C  e.  _V )
54ralrimiva 2615 . . 3  |-  ( ph  ->  A. x  e.  B  C  e.  _V )
6 rabid2 2721 . . 3  |-  ( B  =  { x  e.  B  |  C  e. 
_V }  <->  A. x  e.  B  C  e.  _V )
75, 6sylibr 134 . 2  |-  ( ph  ->  B  =  { x  e.  B  |  C  e.  _V } )
82, 7eqtr4id 2284 1  |-  ( ph  ->  dom  A  =  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1398    e. wcel 2203   A.wral 2520   {crab 2524   _Vcvv 2813    |-> cmpt 4171   dom cdm 4749
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-rab 2529  df-v 2815  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-br 4110  df-opab 4172  df-mpt 4173  df-xp 4755  df-rel 4756  df-cnv 4757  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762
This theorem is referenced by:  ccatalpha  11301  4sqlemffi  13094  limccnp2cntop  15542  incistruhgr  16085
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