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Theorem opabn1stprc 6350
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 2802 . . . . . . . 8  |-  x  e. 
_V
21biantrur 303 . . . . . . 7  |-  ( ph  <->  ( x  e.  _V  /\  ph ) )
32opabbii 4151 . . . . . 6  |-  { <. x ,  y >.  |  ph }  =  { <. x ,  y >.  |  ( x  e.  _V  /\  ph ) }
43dmeqi 4927 . . . . 5  |-  dom  { <. x ,  y >.  |  ph }  =  dom  {
<. x ,  y >.  |  ( x  e. 
_V  /\  ph ) }
5 id 19 . . . . . . 7  |-  ( E. y ph  ->  E. y ph )
65ralrimivw 2604 . . . . . 6  |-  ( E. y ph  ->  A. x  e.  _V  E. y ph )
7 dmopab3 4939 . . . . . 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 2274 . . . 4  |-  ( E. y ph  ->  dom  {
<. x ,  y >.  |  ph }  =  _V )
10 vprc 4216 . . . . 5  |-  -.  _V  e.  _V
1110a1i 9 . . . 4  |-  ( E. y ph  ->  -.  _V  e.  _V )
129, 11eqneltrd 2325 . . 3  |-  ( E. y ph  ->  -.  dom  { <. x ,  y
>.  |  ph }  e.  _V )
13 dmexg 4991 . . 3  |-  ( {
<. x ,  y >.  |  ph }  e.  _V  ->  dom  { <. x ,  y >.  |  ph }  e.  _V )
1412, 13nsyl 631 . 2  |-  ( E. y ph  ->  -.  {
<. x ,  y >.  |  ph }  e.  _V )
15 df-nel 2496 . 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
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    = wceq 1395   E.wex 1538    e. wcel 2200    e/ wnel 2495   A.wral 2508   _Vcvv 2799   {copab 4144   dom cdm 4720
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-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4259  ax-pr 4294  ax-un 4525
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-nel 2496  df-ral 2513  df-rex 2514  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-br 4084  df-opab 4146  df-cnv 4728  df-dm 4730  df-rn 4731
This theorem is referenced by:  griedg0prc  16069
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