Theorem simp13 987

Description: Simplification of doubly triple conjunction. (Contributed by NM, 17-Nov-2011.)

Assertion

Ref	Expression
simp13	|- (((ph /\ ps /\ ch) /\ th /\ ta) -> ch)

Proof of Theorem simp13

Step	Hyp	Ref	Expression
1		simp3 957	. 2 |- ((ph /\ ps /\ ch) -> ch)
2	1	3ad2ant1 976	1 |- (((ph /\ ps /\ ch) /\ th /\ ta) -> ch)

Syntax hints:   -> wi 4   /\ w3a 934

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 177  df-an 360  df-3an 936

This theorem is referenced by:  simpl13  1032  simpr13  1041  simp113  1086  simp213  1095  simp313  1104