Theorem simp12l

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

	Ref	Expression
Assertion	simp12l	|- ( ( ( ch /\ ( ph /\ ps ) /\ th ) /\ ta /\ et ) -> ph )

Proof

Step	Hyp	Ref	Expression
1		simp2l	|- ( ( ch /\ ( ph /\ ps ) /\ th ) -> ph )
2	1	3ad2ant1	|- ( ( ( ch /\ ( ph /\ ps ) /\ th ) /\ ta /\ et ) -> ph )