Theorem jarli

Description: Inference associated with jarl . Partial converse of ja (the other partial converse being jarri ). (Contributed by Wolf Lammen, 4-Oct-2013)

	Ref	Expression
Hypothesis	jarli.1	|- ( ( ph -> ps ) -> ch )
Assertion	jarli	|- ( -. ph -> ch )

Proof

Step	Hyp	Ref	Expression
1		jarli.1	|- ( ( ph -> ps ) -> ch )
2		pm2.21	|- ( -. ph -> ( ph -> ps ) )
3	2 1	syl	|- ( -. ph -> ch )