Theorem syl3an3b 1207

Description: A syllogism inference. (Contributed by NM, 22-Aug-1995.)

Hypotheses

Ref	Expression
syl3an3b.1	|- ( ph <-> th )
syl3an3b.2	|- ( ( ps /\ ch /\ th ) -> ta )

Assertion

Ref	Expression
syl3an3b	|- ( ( ps /\ ch /\ ph ) -> ta )

Proof of Theorem syl3an3b

Step	Hyp	Ref	Expression
1		syl3an3b.1	. . 3 |- ( ph <-> th )
2	1	biimpi 118	. 2 |- ( ph -> th )
3		syl3an3b.2	. 2 |- ( ( ps /\ ch /\ th ) -> ta )
4	2, 3	syl3an3 1204	1 |- ( ( ps /\ ch /\ ph ) -> ta )

Syntax hints:   -> wi 4   <-> wb 103   /\ w3a 919

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  df-3an 921

This theorem is referenced by:  fvun2  5261  nnmsucr  6090  apreim  7703  xrlttr  8870  xrltso  8871  iccdil  9020  icccntr  9022  absexpzap  9966