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Theorem unopab 4205
Description: Union of two ordered pair class abstractions. (Contributed by NM, 30-Sep-2002.)
Assertion
Ref Expression
unopab  |-  ( {
<. x ,  y >.  |  ph }  u.  { <. x ,  y >.  |  ps } )  =  { <. x ,  y
>.  |  ( ph  \/  ps ) }

Proof of Theorem unopab
Dummy variable  z is distinct from all other variables.
StepHypRef Expression
1 unab 3498 . . 3  |-  ( { z  |  E. x E. y ( z  = 
<. x ,  y >.  /\  ph ) }  u.  { z  |  E. x E. y ( z  = 
<. x ,  y >.  /\  ps ) } )  =  { z  |  ( E. x E. y ( z  = 
<. x ,  y >.  /\  ph )  \/  E. x E. y ( z  =  <. x ,  y
>.  /\  ps ) ) }
2 19.43 1681 . . . . 5  |-  ( E. x ( E. y
( z  =  <. x ,  y >.  /\  ph )  \/  E. y
( z  =  <. x ,  y >.  /\  ps ) )  <->  ( E. x E. y ( z  =  <. x ,  y
>.  /\  ph )  \/ 
E. x E. y
( z  =  <. x ,  y >.  /\  ps ) ) )
3 andi 830 . . . . . . . 8  |-  ( ( z  =  <. x ,  y >.  /\  ( ph  \/  ps ) )  <-> 
( ( z  = 
<. x ,  y >.  /\  ph )  \/  (
z  =  <. x ,  y >.  /\  ps ) ) )
43exbii 1658 . . . . . . 7  |-  ( E. y ( z  = 
<. x ,  y >.  /\  ( ph  \/  ps ) )  <->  E. y
( ( z  = 
<. x ,  y >.  /\  ph )  \/  (
z  =  <. x ,  y >.  /\  ps ) ) )
5 19.43 1681 . . . . . . 7  |-  ( E. y ( ( z  =  <. x ,  y
>.  /\  ph )  \/  ( z  =  <. x ,  y >.  /\  ps ) )  <->  ( E. y ( z  = 
<. x ,  y >.  /\  ph )  \/  E. y ( z  = 
<. x ,  y >.  /\  ps ) ) )
64, 5bitr2i 185 . . . . . 6  |-  ( ( E. y ( z  =  <. x ,  y
>.  /\  ph )  \/ 
E. y ( z  =  <. x ,  y
>.  /\  ps ) )  <->  E. y ( z  = 
<. x ,  y >.  /\  ( ph  \/  ps ) ) )
76exbii 1658 . . . . 5  |-  ( E. x ( E. y
( z  =  <. x ,  y >.  /\  ph )  \/  E. y
( z  =  <. x ,  y >.  /\  ps ) )  <->  E. x E. y ( z  = 
<. x ,  y >.  /\  ( ph  \/  ps ) ) )
82, 7bitr3i 186 . . . 4  |-  ( ( E. x E. y
( z  =  <. x ,  y >.  /\  ph )  \/  E. x E. y ( z  = 
<. x ,  y >.  /\  ps ) )  <->  E. x E. y ( z  = 
<. x ,  y >.  /\  ( ph  \/  ps ) ) )
98abbii 2354 . . 3  |-  { z  |  ( E. x E. y ( z  = 
<. x ,  y >.  /\  ph )  \/  E. x E. y ( z  =  <. x ,  y
>.  /\  ps ) ) }  =  { z  |  E. x E. y ( z  = 
<. x ,  y >.  /\  ( ph  \/  ps ) ) }
101, 9eqtri 2259 . 2  |-  ( { z  |  E. x E. y ( z  = 
<. x ,  y >.  /\  ph ) }  u.  { z  |  E. x E. y ( z  = 
<. x ,  y >.  /\  ps ) } )  =  { z  |  E. x E. y
( z  =  <. x ,  y >.  /\  ( ph  \/  ps ) ) }
11 df-opab 4188 . . 3  |-  { <. x ,  y >.  |  ph }  =  { z  |  E. x E. y
( z  =  <. x ,  y >.  /\  ph ) }
12 df-opab 4188 . . 3  |-  { <. x ,  y >.  |  ps }  =  { z  |  E. x E. y
( z  =  <. x ,  y >.  /\  ps ) }
1311, 12uneq12i 3381 . 2  |-  ( {
<. x ,  y >.  |  ph }  u.  { <. x ,  y >.  |  ps } )  =  ( { z  |  E. x E. y
( z  =  <. x ,  y >.  /\  ph ) }  u.  { z  |  E. x E. y ( z  = 
<. x ,  y >.  /\  ps ) } )
14 df-opab 4188 . 2  |-  { <. x ,  y >.  |  (
ph  \/  ps ) }  =  { z  |  E. x E. y
( z  =  <. x ,  y >.  /\  ( ph  \/  ps ) ) }
1510, 13, 143eqtr4i 2269 1  |-  ( {
<. x ,  y >.  |  ph }  u.  { <. x ,  y >.  |  ps } )  =  { <. x ,  y
>.  |  ( ph  \/  ps ) }
Colors of variables: wff set class
Syntax hints:    /\ wa 104    \/ wo 720    = wceq 1402   E.wex 1545   {cab 2224    u. cun 3218   <.cop 3708   {copab 4186
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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This theorem depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823  df-un 3224  df-opab 4188
This theorem is referenced by:  xpundi  4826  xpundir  4827  cnvun  5188  coundi  5284  coundir  5285  mptun  5510  lgsquadlem3  16112
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