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Theorem opabm 4375
Description: Inhabited ordered pair class abstraction. (Contributed by Jim Kingdon, 29-Sep-2018.)
Assertion
Ref Expression
opabm  |-  ( E. z  z  e.  { <. x ,  y >.  |  ph }  <->  E. x E. y ph )
Distinct variable groups:    ph, z    x, z    y, z
Allowed substitution hints:    ph( x, y)

Proof of Theorem opabm
StepHypRef Expression
1 elopab 4352 . . 3  |-  ( z  e.  { <. x ,  y >.  |  ph } 
<->  E. x E. y
( z  =  <. x ,  y >.  /\  ph ) )
21exbii 1653 . 2  |-  ( E. z  z  e.  { <. x ,  y >.  |  ph }  <->  E. z E. x E. y ( z  =  <. x ,  y >.  /\  ph ) )
3 exrot3 1738 . 2  |-  ( E. z E. x E. y ( z  = 
<. x ,  y >.  /\  ph )  <->  E. x E. y E. z ( z  =  <. x ,  y >.  /\  ph ) )
4 vex 2805 . . . . . 6  |-  x  e. 
_V
5 vex 2805 . . . . . 6  |-  y  e. 
_V
64, 5opex 4321 . . . . 5  |-  <. x ,  y >.  e.  _V
76isseti 2811 . . . 4  |-  E. z 
z  =  <. x ,  y >.
8 19.41v 1951 . . . 4  |-  ( E. z ( z  = 
<. x ,  y >.  /\  ph )  <->  ( E. z  z  =  <. x ,  y >.  /\  ph ) )
97, 8mpbiran 948 . . 3  |-  ( E. z ( z  = 
<. x ,  y >.  /\  ph )  <->  ph )
1092exbii 1654 . 2  |-  ( E. x E. y E. z ( z  = 
<. x ,  y >.  /\  ph )  <->  E. x E. y ph )
112, 3, 103bitri 206 1  |-  ( E. z  z  e.  { <. x ,  y >.  |  ph }  <->  E. x E. y ph )
Colors of variables: wff set class
Syntax hints:    /\ wa 104    <-> wb 105    = wceq 1397   E.wex 1540    e. wcel 2202   <.cop 3672   {copab 4149
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-opab 4151
This theorem is referenced by:  lgsquadlem3  15807
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