Theorem simpli

Description: Inference eliminating a conjunct. (Contributed by NM, 15-Jun-1994)

	Ref	Expression
Hypothesis	simpli.1	|- ( ph /\ ps )
Assertion	simpli	|- ph

Proof

Step	Hyp	Ref	Expression
1		simpli.1	|- ( ph /\ ps )
2		simpl	|- ( ( ph /\ ps ) -> ph )
3	1 2	ax-mp	|- ph