Theorem simpl1l 989

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

Assertion

Ref	Expression
simpl1l	|- ( ( ( ( ph /\ ps ) /\ ch /\ th ) /\ ta ) -> ph )

Proof of Theorem simpl1l

Step	Hyp	Ref	Expression
1		simp1l 962	. 2 |- ( ( ( ph /\ ps ) /\ ch /\ th ) -> ph )
2	1	adantr 270	1 |- ( ( ( ( ph /\ ps ) /\ ch /\ th ) /\ ta ) -> ph )

Syntax hints:   -> wi 4   /\ wa 102   /\ w3a 919

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106

This theorem depends on definitions:  df-bi 115  df-3an 921

This theorem is referenced by:  tfisi  4328  prarloc  6693