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Theorem bj-unex 16706
Description: unex 4564 from bounded separation. (Contributed by BJ, 13-Nov-2019.) (Proof modification is discouraged.)
Hypotheses
Ref Expression
bj-unex.1  |-  A  e. 
_V
bj-unex.2  |-  B  e. 
_V
Assertion
Ref Expression
bj-unex  |-  ( A  u.  B )  e. 
_V

Proof of Theorem bj-unex
StepHypRef Expression
1 bj-unex.1 . . 3  |-  A  e. 
_V
2 bj-unex.2 . . 3  |-  B  e. 
_V
31, 2unipr 3930 . 2  |-  U. { A ,  B }  =  ( A  u.  B )
4 bj-prexg 16698 . . . 4  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  { A ,  B }  e.  _V )
51, 2, 4mp2an 426 . . 3  |-  { A ,  B }  e.  _V
65bj-uniex 16704 . 2  |-  U. { A ,  B }  e.  _V
73, 6eqeltrri 2308 1  |-  ( A  u.  B )  e. 
_V
Colors of variables: wff set class
Syntax hints:    e. wcel 2205   _Vcvv 2815    u. cun 3211   {cpr 3692   U.cuni 3916
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-pr 4324  ax-un 4556  ax-bd0 16600  ax-bdor 16603  ax-bdex 16606  ax-bdeq 16607  ax-bdel 16608  ax-bdsb 16609  ax-bdsep 16671
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-rex 2528  df-v 2817  df-un 3217  df-sn 3697  df-pr 3698  df-uni 3917  df-bdc 16628
This theorem is referenced by:  bdunexb  16707  bj-unexg  16708
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