Theorem 19.23bi 747

Description: Inference from Theorem 19.23 of [Margaris] p. 90.

Hypothesis

Ref	Expression
19.23bi.1	|- (E.xph -> ps)

Assertion

Ref	Expression
19.23bi	|- (ph -> ps)

Proof of Theorem 19.23bi

Step	Hyp	Ref	Expression
1		19.8a 712	. 2 |- (ph -> E.xph)
2		19.23bi.1	. 2 |- (E.xph -> ps)
3	1, 2	syl 12	1 |- (ph -> ps)

Syntax hints:   -> wi 2  E.wex 678

This theorem is referenced by:  axreg 1083

This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673

This theorem depends on definitions:  df-bi 128  df-ex 679

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