Theorem imp31

Description: An importation inference. (Contributed by NM, 26-Apr-1994)

	Ref	Expression
Hypothesis	imp31.1	|- ( ph -> ( ps -> ( ch -> th ) ) )
Assertion	imp31	|- ( ( ( ph /\ ps ) /\ ch ) -> th )

Proof

Step	Hyp	Ref	Expression
1		imp31.1	|- ( ph -> ( ps -> ( ch -> th ) ) )
2	1	imp	|- ( ( ph /\ ps ) -> ( ch -> th ) )
3	2	imp	|- ( ( ( ph /\ ps ) /\ ch ) -> th )