Theorem syl13anc 1171

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 1118	. 2 |- ( ph -> ( ch /\ th /\ ta ) )
6		syl13anc.5	. 2 |- ( ( ps /\ ( ch /\ th /\ ta ) ) -> et )
7	1, 5, 6	syl2anc 403	1 |- ( ph -> et )

Syntax hints:   -> wi 4   /\ wa 102   /\ 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:  syl23anc  1176  syl33anc  1184  caovassd  5680  caovcand  5683  caovordid  5687  caovordd  5689  caovdid  5696  caovdird  5699  swoer  6157  swoord1  6158  swoord2  6159  suplub2ti  6414  prarloclem3  6687  fzosubel3  9205  iseqsplit  9458  iseqcaopr  9462  divalglemex  10322