Theorem syl113anc 1228

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

Hypotheses

Ref	Expression
sylXanc.1	|- ( ph -> ps )
sylXanc.2	|- ( ph -> ch )
sylXanc.3	|- ( ph -> th )
sylXanc.4	|- ( ph -> ta )
sylXanc.5	|- ( ph -> et )
syl113anc.6	|- ( ( ps /\ ch /\ ( th /\ ta /\ et ) ) -> ze )

Assertion

Ref	Expression
syl113anc	|- ( ph -> ze )

Proof of Theorem syl113anc

Step	Hyp	Ref	Expression
1		sylXanc.1	. 2 |- ( ph -> ps )
2		sylXanc.2	. 2 |- ( ph -> ch )
3		sylXanc.3	. . 3 |- ( ph -> th )
4		sylXanc.4	. . 3 |- ( ph -> ta )
5		sylXanc.5	. . 3 |- ( ph -> et )
6	3, 4, 5	3jca 1161	. 2 |- ( ph -> ( th /\ ta /\ et ) )
7		syl113anc.6	. 2 |- ( ( ps /\ ch /\ ( th /\ ta /\ et ) ) -> ze )
8	1, 2, 6, 7	syl3anc 1216	1 |- ( ph -> ze )

Syntax hints:   -> wi 4   /\ w3a 962

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 964

This theorem is referenced by:  syl123anc  1233  syl213anc  1235  divalglemnn  11604