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Theorem bnj1299 34020
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)
Hypothesis
Ref Expression
bnj1299.1  |-  ( ph  ->  E. x  e.  A  ( ps  /\  ch )
)
Assertion
Ref Expression
bnj1299  |-  ( ph  ->  E. x  e.  A  ps )

Proof of Theorem bnj1299
StepHypRef Expression
1 bnj1299.1 . 2  |-  ( ph  ->  E. x  e.  A  ( ps  /\  ch )
)
2 bnj1239 34007 . 2  |-  ( E. x  e.  A  ( ps  /\  ch )  ->  E. x  e.  A  ps )
31, 2syl 16 1  |-  ( ph  ->  E. x  e.  A  ps )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 369   E.wrex 2808
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1619  ax-4 1632
This theorem depends on definitions:  df-bi 185  df-an 371  df-ex 1614  df-ral 2812  df-rex 2813
This theorem is referenced by:  bnj1497  34259  bnj1498  34260  bnj1501  34266
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