Theorem biancomd

Description: Commuting conjunction in a biconditional, deduction form. (Contributed by Peter Mazsa, 3-Oct-2018)

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

Proof

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