Theorem syl9r 67

Description: A nested syllogism inference with different antecedents. (Contributed by NM, 5-Aug-1993.)

Hypotheses

Ref	Expression
syl9r.1	|- ( ph -> ( ps -> ch ) )
syl9r.2	|- ( th -> ( ch -> ta ) )

Assertion

Ref	Expression
syl9r	|- ( th -> ( ph -> ( ps -> ta ) ) )

Proof of Theorem syl9r

Step	Hyp	Ref	Expression
1		syl9r.1	. . 3 |- ( ph -> ( ps -> ch ) )
2		syl9r.2	. . 3 |- ( th -> ( ch -> ta ) )
3	1, 2	syl9 66	. 2 |- ( ph -> ( th -> ( ps -> ta ) ) )
4	3	com12 27	1 |- ( th -> ( ph -> ( ps -> ta ) ) )

Syntax hints:   -> wi 4

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7

This theorem is referenced by:  sylan9r  390  pm2.85dc  811  looinvdc  821  pclem6  1265  nfimd  1477  19.23t  1567  fununi  4967  dfimafn  5222  funimass3  5283  nnsub  7952