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Theorem 19.16 1555
Description: Theorem 19.16 of [Margaris] p. 90. (Contributed by NM, 12-Mar-1993.)
Hypothesis
Ref Expression
19.16.1  |-  F/ x ph
Assertion
Ref Expression
19.16  |-  ( A. x ( ph  <->  ps )  ->  ( ph  <->  A. x ps ) )

Proof of Theorem 19.16
StepHypRef Expression
1 19.16.1 . . 3  |-  F/ x ph
2119.3 1554 . 2  |-  ( A. x ph  <->  ph )
3 albi 1468 . 2  |-  ( A. x ( ph  <->  ps )  ->  ( A. x ph  <->  A. x ps ) )
42, 3bitr3id 194 1  |-  ( A. x ( ph  <->  ps )  ->  ( ph  <->  A. x ps ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105   A.wal 1351   F/wnf 1460
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-5 1447  ax-gen 1449  ax-4 1510
This theorem depends on definitions:  df-bi 117  df-nf 1461
This theorem is referenced by: (None)
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