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Theorem 19.28v 1918
Description: Theorem 19.28 of [Margaris] p. 90. (Contributed by NM, 25-Mar-2004.)
Assertion
Ref Expression
19.28v  |-  ( A. x ( ph  /\  ps )  <->  ( ph  /\  A. x ps ) )
Distinct variable group:    ph, x
Allowed substitution hint:    ps( x)

Proof of Theorem 19.28v
StepHypRef Expression
1 nfv 1629 . 2  |-  F/ x ph
2119.28 1842 1  |-  ( A. x ( ph  /\  ps )  <->  ( ph  /\  A. x ps ) )
Colors of variables: wff set class
Syntax hints:    <-> wb 177    /\ wa 359   A.wal 1549
This theorem is referenced by:  cbval2OLD  1990  reu6  3123  tfrlem2  6637  dfer2  6906  kmlem14  8043  kmlem15  8044  19.28vv  27561  bnj1176  29374  bnj1186  29376  cbval2OLD7  29730
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-11 1761
This theorem depends on definitions:  df-bi 178  df-an 361  df-ex 1551  df-nf 1554
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