Theorem bi3impb

Description: Similar to 3impb with implication in hypothesis replaced by biconditional. (Contributed by Alan Sare, 6-Nov-2017)

	Ref	Expression
Hypothesis	bi3impb.1	|- ( ( ph /\ ( ps /\ ch ) ) <-> th )
Assertion	bi3impb	|- ( ( ph /\ ps /\ ch ) -> th )

Proof

Step	Hyp	Ref	Expression
1		bi3impb.1	|- ( ( ph /\ ( ps /\ ch ) ) <-> th )
2	1	biimpi	|- ( ( ph /\ ( ps /\ ch ) ) -> th )
3	2	3impb	|- ( ( ph /\ ps /\ ch ) -> th )