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Theorem opabn1stprc 6429
Description: An ordered-pair class abstraction which does not depend on the first abstraction variable is a proper class. There must be, however, at least one set which satisfies the restricting wff. (Contributed by AV, 27-Dec-2020.)
Assertion
Ref Expression
opabn1stprc  |-  ( E. y ph  ->  { <. x ,  y >.  |  ph }  e/  _V )
Distinct variable groups:    x, y    ph, x
Allowed substitution hint:    ph( y)

Proof of Theorem opabn1stprc
StepHypRef Expression
1 vex 2824 . . . . . . . 8  |-  x  e. 
_V
21biantrur 303 . . . . . . 7  |-  ( ph  <->  ( x  e.  _V  /\  ph ) )
32opabbii 4198 . . . . . 6  |-  { <. x ,  y >.  |  ph }  =  { <. x ,  y >.  |  ( x  e.  _V  /\  ph ) }
43dmeqi 4982 . . . . 5  |-  dom  { <. x ,  y >.  |  ph }  =  dom  {
<. x ,  y >.  |  ( x  e. 
_V  /\  ph ) }
5 id 19 . . . . . . 7  |-  ( E. y ph  ->  E. y ph )
65ralrimivw 2624 . . . . . 6  |-  ( E. y ph  ->  A. x  e.  _V  E. y ph )
7 dmopab3 4994 . . . . . 6  |-  ( A. x  e.  _V  E. y ph 
<->  dom  { <. x ,  y >.  |  ( x  e.  _V  /\  ph ) }  =  _V )
86, 7sylib 122 . . . . 5  |-  ( E. y ph  ->  dom  {
<. x ,  y >.  |  ( x  e. 
_V  /\  ph ) }  =  _V )
94, 8eqtrid 2283 . . . 4  |-  ( E. y ph  ->  dom  {
<. x ,  y >.  |  ph }  =  _V )
10 vprc 4265 . . . . 5  |-  -.  _V  e.  _V
1110a1i 9 . . . 4  |-  ( E. y ph  ->  -.  _V  e.  _V )
129, 11eqneltrd 2334 . . 3  |-  ( E. y ph  ->  -.  dom  { <. x ,  y
>.  |  ph }  e.  _V )
13 dmexg 5046 . . 3  |-  ( {
<. x ,  y >.  |  ph }  e.  _V  ->  dom  { <. x ,  y >.  |  ph }  e.  _V )
1412, 13nsyl 637 . 2  |-  ( E. y ph  ->  -.  {
<. x ,  y >.  |  ph }  e.  _V )
15 df-nel 2516 . 2  |-  ( {
<. x ,  y >.  |  ph }  e/  _V  <->  -. 
{ <. x ,  y
>.  |  ph }  e.  _V )
1614, 15sylibr 134 1  |-  ( E. y ph  ->  { <. x ,  y >.  |  ph }  e/  _V )
Colors of variables:    wff set class
This proof depends on syntax axioms:   -. wn 3    -> wi 4    /\ wa 104    = wceq 1402   E.wex 1545    e. wcel 2209    e/ wnel 2515   A.wral 2528   _Vcvv 2821   {copab 4191   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-in1 623  ax-in2 624  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-13 2211  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346  ax-un 4578
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  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-nel 2516  df-ral 2533  df-rex 2534  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-uni 3936  df-br 4131  df-opab 4193  df-cnv 4782  df-dm 4784  df-rn 4785
This theorem is used by:  griedg0prc  16503
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