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Theorem dfopg 3547
Description: Value of the ordered pair when the arguments are sets. (Contributed by Mario Carneiro, 26-Apr-2015.)
Assertion
Ref Expression
dfopg  |-  ( ( A  e.  V  /\  B  e.  W )  -> 
<. A ,  B >.  =  { { A } ,  { A ,  B } } )

Proof of Theorem dfopg
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 elex 2566 . 2  |-  ( A  e.  V  ->  A  e.  _V )
2 elex 2566 . 2  |-  ( B  e.  W  ->  B  e.  _V )
3 df-3an 887 . . . . . 6  |-  ( ( A  e.  _V  /\  B  e.  _V  /\  x  e.  { { A } ,  { A ,  B } } )  <->  ( ( A  e.  _V  /\  B  e.  _V )  /\  x  e.  { { A } ,  { A ,  B } } ) )
43baibr 829 . . . . 5  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  ( x  e.  { { A } ,  { A ,  B } } 
<->  ( A  e.  _V  /\  B  e.  _V  /\  x  e.  { { A } ,  { A ,  B } } ) ) )
54abbidv 2155 . . . 4  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  { x  |  x  e.  { { A } ,  { A ,  B } } }  =  { x  |  ( A  e.  _V  /\  B  e.  _V  /\  x  e.  { { A } ,  { A ,  B } } ) } )
6 abid2 2158 . . . 4  |-  { x  |  x  e.  { { A } ,  { A ,  B } } }  =  { { A } ,  { A ,  B } }
7 df-op 3384 . . . . 5  |-  <. A ,  B >.  =  { x  |  ( A  e. 
_V  /\  B  e.  _V  /\  x  e.  { { A } ,  { A ,  B } } ) }
87eqcomi 2044 . . . 4  |-  { x  |  ( A  e. 
_V  /\  B  e.  _V  /\  x  e.  { { A } ,  { A ,  B } } ) }  =  <. A ,  B >.
95, 6, 83eqtr3g 2095 . . 3  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  { { A } ,  { A ,  B } }  =  <. A ,  B >. )
109eqcomd 2045 . 2  |-  ( ( A  e.  _V  /\  B  e.  _V )  -> 
<. A ,  B >.  =  { { A } ,  { A ,  B } } )
111, 2, 10syl2an 273 1  |-  ( ( A  e.  V  /\  B  e.  W )  -> 
<. A ,  B >.  =  { { A } ,  { A ,  B } } )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 97    /\ w3a 885    = wceq 1243    e. wcel 1393   {cab 2026   _Vcvv 2557   {csn 3375   {cpr 3376   <.cop 3378
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-11 1397  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022
This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-v 2559  df-op 3384
This theorem is referenced by:  dfop  3548  opexg  3964  opexgOLD  3965  opth1  3973  opth  3974  0nelop  3985  op1stbg  4210
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