Theorem bnj422

Description: /\ -manipulation. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (Proof shortened by Andrew Salmon, 14-Jun-2011) (New usage is discouraged.)

	Ref	Expression
Assertion	bnj422	|- ( ( ph /\ ps /\ ch /\ th ) <-> ( ch /\ th /\ ph /\ ps ) )

Proof

Step	Hyp	Ref	Expression
1		bnj345	|- ( ( ph /\ ps /\ ch /\ th ) <-> ( th /\ ph /\ ps /\ ch ) )
2		bnj345	|- ( ( th /\ ph /\ ps /\ ch ) <-> ( ch /\ th /\ ph /\ ps ) )
3	1 2	bitri	|- ( ( ph /\ ps /\ ch /\ th ) <-> ( ch /\ th /\ ph /\ ps ) )