Theorem simp1ll

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

	Ref	Expression
Assertion	simp1ll	|- ( ( ( ( ph /\ ps ) /\ ch ) /\ th /\ ta ) -> ph )

Proof

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