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Theorem dmmptd 5384
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 5161 . 2  |-  dom  A  =  { x  e.  B  |  C  e.  _V }
3 dmmptd.c . . . . 5  |-  ( (
ph  /\  x  e.  B )  ->  C  e.  V )
43elexd 2773 . . . 4  |-  ( (
ph  /\  x  e.  B )  ->  C  e.  _V )
54ralrimiva 2567 . . 3  |-  ( ph  ->  A. x  e.  B  C  e.  _V )
6 rabid2 2671 . . 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 2245 1  |-  ( ph  ->  dom  A  =  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1364    e. wcel 2164   A.wral 2472   {crab 2476   _Vcvv 2760    |-> cmpt 4090   dom cdm 4659
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 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ral 2477  df-rex 2478  df-rab 2481  df-v 2762  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-br 4030  df-opab 4091  df-mpt 4092  df-xp 4665  df-rel 4666  df-cnv 4667  df-dm 4669  df-rn 4670  df-res 4671  df-ima 4672
This theorem is referenced by:  4sqlemffi  12534  limccnp2cntop  14831
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