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Theorem bnj1142 28878
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)
Hypothesis
Ref Expression
bnj1142.1  |-  ( ph  ->  A. x ( x  e.  A  ->  ps ) )
Assertion
Ref Expression
bnj1142  |-  ( ph  ->  A. x  e.  A  ps )

Proof of Theorem bnj1142
StepHypRef Expression
1 bnj1142.1 . 2  |-  ( ph  ->  A. x ( x  e.  A  ->  ps ) )
2 df-ral 2679 . 2  |-  ( A. x  e.  A  ps  <->  A. x ( x  e.  A  ->  ps )
)
31, 2sylibr 204 1  |-  ( ph  ->  A. x  e.  A  ps )
Colors of variables: wff set class
Syntax hints:    -> wi 4   A.wal 1546    e. wcel 1721   A.wral 2674
This theorem is referenced by:  bnj1476  28936  bnj1533  28941  bnj1523  29158
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 178  df-ral 2679
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