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Theorem eqop2 5824
Description: Two ways to express equality with an ordered pair. (Contributed by NM, 25-Feb-2014.)
Hypotheses
Ref Expression
eqop2.1  |-  B  e. 
_V
eqop2.2  |-  C  e. 
_V
Assertion
Ref Expression
eqop2  |-  ( A  =  <. B ,  C >.  <-> 
( A  e.  ( _V  X.  _V )  /\  ( ( 1st `  A
)  =  B  /\  ( 2nd `  A )  =  C ) ) )

Proof of Theorem eqop2
StepHypRef Expression
1 eqop2.1 . . . 4  |-  B  e. 
_V
2 eqop2.2 . . . 4  |-  C  e. 
_V
31, 2opelvv 4408 . . 3  |-  <. B ,  C >.  e.  ( _V 
X.  _V )
4 eleq1 2141 . . 3  |-  ( A  =  <. B ,  C >.  ->  ( A  e.  ( _V  X.  _V ) 
<-> 
<. B ,  C >.  e.  ( _V  X.  _V ) ) )
53, 4mpbiri 166 . 2  |-  ( A  =  <. B ,  C >.  ->  A  e.  ( _V  X.  _V )
)
6 eqop 5823 . 2  |-  ( A  e.  ( _V  X.  _V )  ->  ( A  =  <. B ,  C >.  <-> 
( ( 1st `  A
)  =  B  /\  ( 2nd `  A )  =  C ) ) )
75, 6biadan2 443 1  |-  ( A  =  <. B ,  C >.  <-> 
( A  e.  ( _V  X.  _V )  /\  ( ( 1st `  A
)  =  B  /\  ( 2nd `  A )  =  C ) ) )
Colors of variables: wff set class
Syntax hints:    /\ wa 102    <-> wb 103    = wceq 1284    e. wcel 1433   _Vcvv 2601   <.cop 3401    X. cxp 4361   ` cfv 4922   1stc1st 5785   2ndc2nd 5786
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-13 1444  ax-14 1445  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-sep 3896  ax-pow 3948  ax-pr 3964  ax-un 4188
This theorem depends on definitions:  df-bi 115  df-3an 921  df-tru 1287  df-nf 1390  df-sb 1686  df-eu 1944  df-mo 1945  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ral 2353  df-rex 2354  df-v 2603  df-sbc 2816  df-un 2977  df-in 2979  df-ss 2986  df-pw 3384  df-sn 3404  df-pr 3405  df-op 3407  df-uni 3602  df-br 3786  df-opab 3840  df-mpt 3841  df-id 4048  df-xp 4369  df-rel 4370  df-cnv 4371  df-co 4372  df-dm 4373  df-rn 4374  df-iota 4887  df-fun 4924  df-fn 4925  df-f 4926  df-fo 4928  df-fv 4930  df-1st 5787  df-2nd 5788
This theorem is referenced by: (None)
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