Theorem bnj446

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

	Ref	Expression
Assertion	bnj446	|- ( ( ph /\ ps /\ ch /\ th ) <-> ( ( ps /\ ch /\ th ) /\ ph ) )

Proof

Step	Hyp	Ref	Expression
1		bnj345	|- ( ( ps /\ ch /\ th /\ ph ) <-> ( ph /\ ps /\ ch /\ th ) )
2		df-bnj17	|- ( ( ps /\ ch /\ th /\ ph ) <-> ( ( ps /\ ch /\ th ) /\ ph ) )
3	1 2	bitr3i	|- ( ( ph /\ ps /\ ch /\ th ) <-> ( ( ps /\ ch /\ th ) /\ ph ) )