Theorem 3anan32OLD

Description: Obsolete version of 3anan32 as of 15-Jun-2026. Convert triple conjunction to conjunction, then commute. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.) (Proof modification is discouraged.)

	Ref	Expression
Assertion	3anan32OLD	|- ( ( ph /\ ps /\ ch ) <-> ( ( ph /\ ch ) /\ ps ) )

Proof

Step	Hyp	Ref	Expression
1		df-3an	|- ( ( ph /\ ps /\ ch ) <-> ( ( ph /\ ps ) /\ ch ) )
2		an32	|- ( ( ( ph /\ ps ) /\ ch ) <-> ( ( ph /\ ch ) /\ ps ) )
3	1 2	bitri	|- ( ( ph /\ ps /\ ch ) <-> ( ( ph /\ ch ) /\ ps ) )