Theorem syl13anc 1137

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 )
syl13anc.5	|- ( ( ps /\ ( ch /\ th /\ ta ) ) -> et )

Assertion

Ref	Expression
syl13anc	|- ( ph -> et )

Proof of Theorem syl13anc

Step	Hyp	Ref	Expression
1		sylXanc.1	. 2 |- ( ph -> ps )
2		sylXanc.2	. . 3 |- ( ph -> ch )
3		sylXanc.3	. . 3 |- ( ph -> th )
4		sylXanc.4	. . 3 |- ( ph -> ta )
5	2, 3, 4	3jca 1084	. 2 |- ( ph -> ( ch /\ th /\ ta ) )
6		syl13anc.5	. 2 |- ( ( ps /\ ( ch /\ th /\ ta ) ) -> et )
7	1, 5, 6	syl2anc 391	1 |- ( ph -> et )

Syntax hints:   -> wi 4   /\ wa 97   /\ w3a 885

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  df-3an 887

This theorem is referenced by:  syl23anc  1142  syl33anc  1150  caovassd  5660  caovcand  5663  caovordid  5667  caovordd  5669  caovdid  5676  caovdird  5679  swoer  6134  swoord1  6135  swoord2  6136  prarloclem3  6595  fzosubel3  9052  iseqsplit  9238  iseqcaopr  9242