Theorem syl321anc 1250

Description: Syllogism combined with contraction. (Contributed by NM, 11-Jul-2012.)

Hypotheses

Ref	Expression
sylXanc.1	|- ( ph -> ps )
sylXanc.2	|- ( ph -> ch )
sylXanc.3	|- ( ph -> th )
sylXanc.4	|- ( ph -> ta )
sylXanc.5	|- ( ph -> et )
sylXanc.6	|- ( ph -> ze )
syl321anc.7	|- ( ( ( ps /\ ch /\ th ) /\ ( ta /\ et ) /\ ze ) -> si )

Assertion

Ref	Expression
syl321anc	|- ( ph -> si )

Proof of Theorem syl321anc

Step	Hyp	Ref	Expression
1		sylXanc.1	. 2 |- ( ph -> ps )
2		sylXanc.2	. 2 |- ( ph -> ch )
3		sylXanc.3	. 2 |- ( ph -> th )
4		sylXanc.4	. . 3 |- ( ph -> ta )
5		sylXanc.5	. . 3 |- ( ph -> et )
6	4, 5	jca 304	. 2 |- ( ph -> ( ta /\ et ) )
7		sylXanc.6	. 2 |- ( ph -> ze )
8		syl321anc.7	. 2 |- ( ( ( ps /\ ch /\ th ) /\ ( ta /\ et ) /\ ze ) -> si )
9	1, 2, 3, 6, 7, 8	syl311anc 1242	1 |- ( ph -> si )

Syntax hints:   -> wi 4   /\ wa 103   /\ w3a 968

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107

This theorem depends on definitions:  df-bi 116  df-3an 970

This theorem is referenced by:  syl322anc  1256