Theorem simp1l2

Description: Simplification of conjunction. (Contributed by NM, 9-Mar-2012)

	Ref	Expression
Assertion	simp1l2	|- ( ( ( ( ph /\ ps /\ ch ) /\ th ) /\ ta /\ et ) -> ps )

Proof

Step	Hyp	Ref	Expression
1		simpl2	|- ( ( ( ph /\ ps /\ ch ) /\ th ) -> ps )
2	1	3ad2ant1	|- ( ( ( ( ph /\ ps /\ ch ) /\ th ) /\ ta /\ et ) -> ps )