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Theorem bnj596 34204
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)
Hypotheses
Ref Expression
bnj596.1  |-  ( ph  ->  A. x ph )
bnj596.2  |-  ( ph  ->  E. x ps )
Assertion
Ref Expression
bnj596  |-  ( ph  ->  E. x ( ph  /\ 
ps ) )

Proof of Theorem bnj596
StepHypRef Expression
1 bnj596.2 . . 3  |-  ( ph  ->  E. x ps )
21ancli 549 . 2  |-  ( ph  ->  ( ph  /\  E. x ps ) )
3 bnj596.1 . . . 4  |-  ( ph  ->  A. x ph )
43nfi 1628 . . 3  |-  F/ x ph
5419.42 1977 . 2  |-  ( E. x ( ph  /\  ps )  <->  ( ph  /\  E. x ps ) )
62, 5sylibr 212 1  |-  ( ph  ->  E. x ( ph  /\ 
ps ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 367   A.wal 1396   E.wex 1617
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1623  ax-4 1636  ax-5 1709  ax-6 1752  ax-7 1795  ax-10 1842  ax-12 1859
This theorem depends on definitions:  df-bi 185  df-an 369  df-ex 1618  df-nf 1622
This theorem is referenced by:  bnj1275  34273  bnj1340  34283  bnj594  34371  bnj1398  34491
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