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Theorem elvvv 4913
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 4870 . 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 659 . . . . 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 1847 . . . . . 6  |-  ( E. x E. y ( A  =  <. w ,  z >.  /\  w  =  <. x ,  y
>. )  <->  ( A  = 
<. w ,  z >.  /\  E. x E. y  w  =  <. x ,  y >. ) )
4 ancom 456 . . . . . . 7  |-  ( ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  ( A  = 
<. w ,  z >.  /\  w  =  <. x ,  y >. )
)
542exbii 1730 . . . . . 6  |-  ( E. x E. y ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. x E. y
( A  =  <. w ,  z >.  /\  w  =  <. x ,  y
>. ) )
6 vex 3060 . . . . . . . 8  |-  z  e. 
_V
76biantru 512 . . . . . . 7  |-  ( ( A  =  <. w ,  z >.  /\  w  e.  ( _V  X.  _V ) )  <->  ( ( A  =  <. w ,  z >.  /\  w  e.  ( _V  X.  _V ) )  /\  z  e.  _V ) )
8 elvv 4912 . . . . . . . 8  |-  ( w  e.  ( _V  X.  _V )  <->  E. x E. y  w  =  <. x ,  y >. )
98anbi2i 705 . . . . . . 7  |-  ( ( A  =  <. w ,  z >.  /\  w  e.  ( _V  X.  _V ) )  <->  ( A  =  <. w ,  z
>.  /\  E. x E. y  w  =  <. x ,  y >. )
)
107, 9bitr3i 259 . . . . . 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 286 . . . . 5  |-  ( ( ( A  =  <. w ,  z >.  /\  w  e.  ( _V  X.  _V ) )  /\  z  e.  _V )  <->  E. x E. y ( w  = 
<. x ,  y >.  /\  A  =  <. w ,  z >. )
)
122, 11bitr3i 259 . . . 4  |-  ( ( A  =  <. w ,  z >.  /\  (
w  e.  ( _V 
X.  _V )  /\  z  e.  _V ) )  <->  E. x E. y ( w  = 
<. x ,  y >.  /\  A  =  <. w ,  z >. )
)
13122exbii 1730 . . 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 1943 . . . 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 1938 . . . . . 6  |-  ( E. w E. z ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. z E. w
( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. ) )
16 opex 4678 . . . . . . . 8  |-  <. x ,  y >.  e.  _V
17 opeq1 4180 . . . . . . . . 9  |-  ( w  =  <. x ,  y
>.  ->  <. w ,  z
>.  =  <. <. x ,  y >. ,  z
>. )
1817eqeq2d 2472 . . . . . . . 8  |-  ( w  =  <. x ,  y
>.  ->  ( A  = 
<. w ,  z >.  <->  A  =  <. <. x ,  y
>. ,  z >. ) )
1916, 18ceqsexv 3096 . . . . . . 7  |-  ( E. w ( w  = 
<. x ,  y >.  /\  A  =  <. w ,  z >. )  <->  A  =  <. <. x ,  y
>. ,  z >. )
2019exbii 1729 . . . . . 6  |-  ( E. z E. w ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. z  A  = 
<. <. x ,  y
>. ,  z >. )
2115, 20bitri 257 . . . . 5  |-  ( E. w E. z ( w  =  <. x ,  y >.  /\  A  =  <. w ,  z
>. )  <->  E. z  A  = 
<. <. x ,  y
>. ,  z >. )
22212exbii 1730 . . . 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 259 . . 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 257 . 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 257 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 189    /\ wa 375    = wceq 1455   E.wex 1674    e. wcel 1898   _Vcvv 3057   <.cop 3986    X. cxp 4851
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1680  ax-4 1693  ax-5 1769  ax-6 1816  ax-7 1862  ax-9 1907  ax-10 1926  ax-11 1931  ax-12 1944  ax-13 2102  ax-ext 2442  ax-sep 4539  ax-nul 4548  ax-pr 4653
This theorem depends on definitions:  df-bi 190  df-or 376  df-an 377  df-3an 993  df-tru 1458  df-ex 1675  df-nf 1679  df-sb 1809  df-clab 2449  df-cleq 2455  df-clel 2458  df-nfc 2592  df-ne 2635  df-rab 2758  df-v 3059  df-dif 3419  df-un 3421  df-in 3423  df-ss 3430  df-nul 3744  df-if 3894  df-sn 3981  df-pr 3983  df-op 3987  df-opab 4476  df-xp 4859
This theorem is referenced by:  ssrelrel  4954  dftpos3  7017
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