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Theorem dmmptd 5514
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 5283 . 2  |-  dom  A  =  { x  e.  B  |  C  e.  _V }
3 dmmptd.c . . . . 5  |-  ( (
ph  /\  x  e.  B )  ->  C  e.  V )
43elexd 2835 . . . 4  |-  ( (
ph  /\  x  e.  B )  ->  C  e.  _V )
54ralrimiva 2623 . . 3  |-  ( ph  ->  A. x  e.  B  C  e.  _V )
6 rabid2 2729 . . 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 2290 1  |-  ( ph  ->  dom  A  =  B )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    /\ wa 104    = wceq 1402    e. wcel 2209   A.wral 2528   {crab 2532   _Vcvv 2821    |-> cmpt 4192   dom cdm 4774
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-br 4131  df-opab 4193  df-mpt 4194  df-xp 4780  df-rel 4781  df-cnv 4782  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787
This theorem is used by:  ccatalpha  11381  4sqlemffi  13175  limccnp2cntop  15778  incistruhgr  16331
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