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Theorem elvvv 5059
Description: Membership in universal class of ordered triples. (Contributed by NM, 17-Dec-2008.)
Assertion
Ref Expression
elvvv  |-  ( A  e.  ( ( _V 
X.  _V )  X.  _V ) 
<->  E. x E. y E. z  A  =  <. <. x ,  y
>. ,  z >. )
Distinct variable group:    x, y, z, A

Proof of Theorem elvvv
Dummy variable  w is distinct from all other variables.
StepHypRef Expression
1 elxp 5016 . 2  |-  ( A  e.  ( ( _V 
X.  _V )  X.  _V ) 
<->  E. w E. z
( A  =  <. w ,  z >.  /\  (
w  e.  ( _V 
X.  _V )  /\  z  e.  _V ) ) )
2 anass 649 . . . . 5  |-  ( ( ( A  =  <. w ,  z >.  /\  w  e.  ( _V  X.  _V ) )  /\  z  e.  _V )  <->  ( A  =  <. w ,  z
>.  /\  ( w  e.  ( _V  X.  _V )  /\  z  e.  _V ) ) )
3 19.42vv 1951 . . . . . 6  |-  ( E. x E. y ( A  =  <. w ,  z >.  /\  w  =  <. x ,  y
>. )  <->  ( A  = 
<. w ,  z >.  /\  E. x E. y  w  =  <. x ,  y >. ) )
4 ancom 450 . . . . . . 7  |-  ( ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  ( A  = 
<. w ,  z >.  /\  w  =  <. x ,  y >. )
)
542exbii 1645 . . . . . 6  |-  ( E. x E. y ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. x E. y
( A  =  <. w ,  z >.  /\  w  =  <. x ,  y
>. ) )
6 vex 3116 . . . . . . . 8  |-  z  e. 
_V
76biantru 505 . . . . . . 7  |-  ( ( A  =  <. w ,  z >.  /\  w  e.  ( _V  X.  _V ) )  <->  ( ( A  =  <. w ,  z >.  /\  w  e.  ( _V  X.  _V ) )  /\  z  e.  _V ) )
8 elvv 5058 . . . . . . . 8  |-  ( w  e.  ( _V  X.  _V )  <->  E. x E. y  w  =  <. x ,  y >. )
98anbi2i 694 . . . . . . 7  |-  ( ( A  =  <. w ,  z >.  /\  w  e.  ( _V  X.  _V ) )  <->  ( A  =  <. w ,  z
>.  /\  E. x E. y  w  =  <. x ,  y >. )
)
107, 9bitr3i 251 . . . . . 6  |-  ( ( ( A  =  <. w ,  z >.  /\  w  e.  ( _V  X.  _V ) )  /\  z  e.  _V )  <->  ( A  =  <. w ,  z
>.  /\  E. x E. y  w  =  <. x ,  y >. )
)
113, 5, 103bitr4ri 278 . . . . 5  |-  ( ( ( A  =  <. w ,  z >.  /\  w  e.  ( _V  X.  _V ) )  /\  z  e.  _V )  <->  E. x E. y ( w  = 
<. x ,  y >.  /\  A  =  <. w ,  z >. )
)
122, 11bitr3i 251 . . . 4  |-  ( ( A  =  <. w ,  z >.  /\  (
w  e.  ( _V 
X.  _V )  /\  z  e.  _V ) )  <->  E. x E. y ( w  = 
<. x ,  y >.  /\  A  =  <. w ,  z >. )
)
13122exbii 1645 . . 3  |-  ( E. w E. z ( A  =  <. w ,  z >.  /\  (
w  e.  ( _V 
X.  _V )  /\  z  e.  _V ) )  <->  E. w E. z E. x E. y ( w  = 
<. x ,  y >.  /\  A  =  <. w ,  z >. )
)
14 exrot4 1802 . . . 4  |-  ( E. x E. y E. w E. z ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. w E. z E. x E. y ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. ) )
15 excom 1798 . . . . . 6  |-  ( E. w E. z ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. z E. w
( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. ) )
16 opex 4711 . . . . . . . 8  |-  <. x ,  y >.  e.  _V
17 opeq1 4213 . . . . . . . . 9  |-  ( w  =  <. x ,  y
>.  ->  <. w ,  z
>.  =  <. <. x ,  y >. ,  z
>. )
1817eqeq2d 2481 . . . . . . . 8  |-  ( w  =  <. x ,  y
>.  ->  ( A  = 
<. w ,  z >.  <->  A  =  <. <. x ,  y
>. ,  z >. ) )
1916, 18ceqsexv 3150 . . . . . . 7  |-  ( E. w ( w  = 
<. x ,  y >.  /\  A  =  <. w ,  z >. )  <->  A  =  <. <. x ,  y
>. ,  z >. )
2019exbii 1644 . . . . . 6  |-  ( E. z E. w ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. z  A  = 
<. <. x ,  y
>. ,  z >. )
2115, 20bitri 249 . . . . 5  |-  ( E. w E. z ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. z  A  = 
<. <. x ,  y
>. ,  z >. )
22212exbii 1645 . . . 4  |-  ( E. x E. y E. w E. z ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. x E. y E. z  A  =  <. <. x ,  y
>. ,  z >. )
2314, 22bitr3i 251 . . 3  |-  ( E. w E. z E. x E. y ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. x E. y E. z  A  =  <. <. x ,  y
>. ,  z >. )
2413, 23bitri 249 . 2  |-  ( E. w E. z ( A  =  <. w ,  z >.  /\  (
w  e.  ( _V 
X.  _V )  /\  z  e.  _V ) )  <->  E. x E. y E. z  A  =  <. <. x ,  y
>. ,  z >. )
251, 24bitri 249 1  |-  ( A  e.  ( ( _V 
X.  _V )  X.  _V ) 
<->  E. x E. y E. z  A  =  <. <. x ,  y
>. ,  z >. )
Colors of variables: wff setvar class
Syntax hints:    <-> wb 184    /\ wa 369    = wceq 1379   E.wex 1596    e. wcel 1767   _Vcvv 3113   <.cop 4033    X. cxp 4997
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1601  ax-4 1612  ax-5 1680  ax-6 1719  ax-7 1739  ax-9 1771  ax-10 1786  ax-11 1791  ax-12 1803  ax-13 1968  ax-ext 2445  ax-sep 4568  ax-nul 4576  ax-pr 4686
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 975  df-tru 1382  df-ex 1597  df-nf 1600  df-sb 1712  df-clab 2453  df-cleq 2459  df-clel 2462  df-nfc 2617  df-ne 2664  df-rab 2823  df-v 3115  df-dif 3479  df-un 3481  df-in 3483  df-ss 3490  df-nul 3786  df-if 3940  df-sn 4028  df-pr 4030  df-op 4034  df-opab 4506  df-xp 5005
This theorem is referenced by:  ssrelrel  5103  dftpos3  6974
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