Theorem biancomi

Description: Commuting conjunction in a biconditional. (Contributed by Peter Mazsa, 17-Jun-2018)

	Ref	Expression
Hypothesis	biancomi.1	|- ( ph <-> ( ch /\ ps ) )
Assertion	biancomi	|- ( ph <-> ( ps /\ ch ) )

Proof

Step	Hyp	Ref	Expression
1		biancomi.1	|- ( ph <-> ( ch /\ ps ) )
2		ancom	|- ( ( ps /\ ch ) <-> ( ch /\ ps ) )
3	1 2	bitr4i	|- ( ph <-> ( ps /\ ch ) )