Theorem pm2.86i

Description: Inference associated with pm2.86 . (Contributed by NM, 5-Aug-1993) (Proof shortened by Wolf Lammen, 3-Apr-2013)

	Ref	Expression
Hypothesis	pm2.86i.1	|- ( ( ph -> ps ) -> ( ph -> ch ) )
Assertion	pm2.86i	|- ( ph -> ( ps -> ch ) )

Proof

Step	Hyp	Ref	Expression
1		pm2.86i.1	|- ( ( ph -> ps ) -> ( ph -> ch ) )
2	1	jarri	|- ( ps -> ( ph -> ch ) )
3	2	com12	|- ( ph -> ( ps -> ch ) )