Theorem simp1i

Description: Infer a conjunct from a triple conjunction. (Contributed by NM, 19-Apr-2005)

	Ref	Expression
Hypothesis	3simp1i.1	|- ( ph /\ ps /\ ch )
Assertion	simp1i	|- ph

Proof

Step	Hyp	Ref	Expression
1		3simp1i.1	|- ( ph /\ ps /\ ch )
2		simp1	|- ( ( ph /\ ps /\ ch ) -> ph )
3	1 2	ax-mp	|- ph