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Theorem optocl 4808
Description: Implicit substitution of class for ordered pair. (Contributed by NM, 5-Mar-1995.)
Hypotheses
Ref Expression
optocl.1  |-  D  =  ( B  X.  C
)
optocl.2  |-  ( <.
x ,  y >.  =  A  ->  ( ph  <->  ps ) )
optocl.3  |-  ( ( x  e.  B  /\  y  e.  C )  ->  ph )
Assertion
Ref Expression
optocl  |-  ( A  e.  D  ->  ps )
Distinct variable groups:    x, y, A   
x, B, y    x, C, y    ps, x, y
Allowed substitution hints:    ph( x, y)    D( x, y)

Proof of Theorem optocl
StepHypRef Expression
1 elxp3 4786 . . 3  |-  ( A  e.  ( B  X.  C )  <->  E. x E. y ( <. x ,  y >.  =  A  /\  <. x ,  y
>.  e.  ( B  X.  C ) ) )
2 opelxp 4761 . . . . . . 7  |-  ( <.
x ,  y >.  e.  ( B  X.  C
)  <->  ( x  e.  B  /\  y  e.  C ) )
3 optocl.3 . . . . . . 7  |-  ( ( x  e.  B  /\  y  e.  C )  ->  ph )
42, 3sylbi 121 . . . . . 6  |-  ( <.
x ,  y >.  e.  ( B  X.  C
)  ->  ph )
5 optocl.2 . . . . . 6  |-  ( <.
x ,  y >.  =  A  ->  ( ph  <->  ps ) )
64, 5imbitrid 154 . . . . 5  |-  ( <.
x ,  y >.  =  A  ->  ( <.
x ,  y >.  e.  ( B  X.  C
)  ->  ps )
)
76imp 124 . . . 4  |-  ( (
<. x ,  y >.  =  A  /\  <. x ,  y >.  e.  ( B  X.  C ) )  ->  ps )
87exlimivv 1945 . . 3  |-  ( E. x E. y (
<. x ,  y >.  =  A  /\  <. x ,  y >.  e.  ( B  X.  C ) )  ->  ps )
91, 8sylbi 121 . 2  |-  ( A  e.  ( B  X.  C )  ->  ps )
10 optocl.1 . 2  |-  D  =  ( B  X.  C
)
119, 10eleq2s 2326 1  |-  ( A  e.  D  ->  ps )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    = wceq 1398   E.wex 1541    e. wcel 2202   <.cop 3676    X. cxp 4729
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-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  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-opab 4156  df-xp 4737
This theorem is referenced by:  2optocl  4809  3optocl  4810  ecoptocl  6834  ax1rid  8157  ax0id  8158  axcnre  8161
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