Theorem sylan2i 399

Description: A syllogism inference. (Contributed by NM, 1-Aug-1994.)

Hypotheses

Ref	Expression
sylan2i.1	|- ( ph -> th )
sylan2i.2	|- ( ps -> ( ( ch /\ th ) -> ta ) )

Assertion

Ref	Expression
sylan2i	|- ( ps -> ( ( ch /\ ph ) -> ta ) )

Proof of Theorem sylan2i

Step	Hyp	Ref	Expression
1		sylan2i.1	. . 3 |- ( ph -> th )
2	1	a1i 9	. 2 |- ( ps -> ( ph -> th ) )
3		sylan2i.2	. 2 |- ( ps -> ( ( ch /\ th ) -> ta ) )
4	2, 3	sylan2d 288	1 |- ( ps -> ( ( ch /\ ph ) -> ta ) )

Syntax hints:   -> wi 4   /\ wa 102

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106

This theorem depends on definitions:  df-bi 115

This theorem is referenced by:  syl2ani  400