Theorem sylan2d 278

Description: A syllogism deduction. (Contributed by NM, 15-Dec-2004.)

Hypotheses

Ref	Expression
sylan2d.1	|- ( ph -> ( ps -> ch ) )
sylan2d.2	|- ( ph -> ( ( th /\ ch ) -> ta ) )

Assertion

Ref	Expression
sylan2d	|- ( ph -> ( ( th /\ ps ) -> ta ) )

Proof of Theorem sylan2d

Step	Hyp	Ref	Expression
1		sylan2d.1	. . 3 |- ( ph -> ( ps -> ch ) )
2		sylan2d.2	. . . 4 |- ( ph -> ( ( th /\ ch ) -> ta ) )
3	2	ancomsd 256	. . 3 |- ( ph -> ( ( ch /\ th ) -> ta ) )
4	1, 3	syland 277	. 2 |- ( ph -> ( ( ps /\ th ) -> ta ) )
5	4	ancomsd 256	1 |- ( ph -> ( ( th /\ ps ) -> ta ) )

Syntax hints:   -> wi 4   /\ wa 97

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101

This theorem depends on definitions:  df-bi 110

This theorem is referenced by:  syl2and  279  sylan2i  387  swopo  4043  prarloclemlo  6592  prodgt02  7819  prodge02  7821