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Theorem dmopab 4948
Description: The domain of a class of ordered pairs. (Contributed by NM, 16-May-1995.) (Revised by Mario Carneiro, 4-Dec-2016.)
Assertion
Ref Expression
dmopab  |-  dom  { <. x ,  y >.  |  ph }  =  {
x  |  E. y ph }
Distinct variable group:    x, y
Allowed substitution hints:    ph( x, y)

Proof of Theorem dmopab
StepHypRef Expression
1 nfopab1 4163 . . 3  |-  F/_ x { <. x ,  y
>.  |  ph }
2 nfopab2 4164 . . 3  |-  F/_ y { <. x ,  y
>.  |  ph }
31, 2dfdmf 4930 . 2  |-  dom  { <. x ,  y >.  |  ph }  =  {
x  |  E. y  x { <. x ,  y
>.  |  ph } y }
4 df-br 4094 . . . . 5  |-  ( x { <. x ,  y
>.  |  ph } y  <->  <. x ,  y >.  e.  { <. x ,  y
>.  |  ph } )
5 opabid 4356 . . . . 5  |-  ( <.
x ,  y >.  e.  { <. x ,  y
>.  |  ph }  <->  ph )
64, 5bitri 184 . . . 4  |-  ( x { <. x ,  y
>.  |  ph } y  <->  ph )
76exbii 1654 . . 3  |-  ( E. y  x { <. x ,  y >.  |  ph } y  <->  E. y ph )
87abbii 2347 . 2  |-  { x  |  E. y  x { <. x ,  y >.  |  ph } y }  =  { x  |  E. y ph }
93, 8eqtri 2252 1  |-  dom  { <. x ,  y >.  |  ph }  =  {
x  |  E. y ph }
Colors of variables: wff set class
Syntax hints:    = wceq 1398   E.wex 1541    e. wcel 2202   {cab 2217   <.cop 3676   class class class wbr 4093   {copab 4154   dom cdm 4731
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 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-br 4094  df-opab 4156  df-dm 4741
This theorem is referenced by:  dmopabss  4949  dmopab3  4950  fndmin  5763  dmoprab  6112  shftdm  11445
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