Theorem 19.28v 1298

Description: Theorem 19.28 of [Margaris] p. 90.

Assertion

Ref	Expression
19.28v	|- (A.x(ph /\ ps) <-> (ph /\ A.xps))

Distinct variable group:   ph,x

Proof of Theorem 19.28v

Step	Hyp	Ref	Expression
1		ax-17 970	. 2 |- (ph -> A.xph)
2	1	19.28 1069	1 |- (A.x(ph /\ ps) <-> (ph /\ A.xps))

Syntax hints:   <-> wb 146   /\ wa 223  A.wal 953

This theorem is referenced by:  reu3 1928  iinss 2596  tfrlem2 3907  dfer2 4255  kmlem14 4761  kmlem15 4762

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-gen 962  ax-17 970  ax-4 972  ax-5o 974

This theorem depends on definitions:  df-bi 147  df-an 225

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