Theorem bi23impib

Description: 3impib with the inner implication of the hypothesis a biconditional. (Contributed by Alan Sare, 6-Nov-2017)

	Ref	Expression
Hypothesis	bi23impib.1	|- ( ph -> ( ( ps /\ ch ) <-> th ) )
Assertion	bi23impib	|- ( ( ph /\ ps /\ ch ) -> th )

Proof

Step	Hyp	Ref	Expression
1		bi23impib.1	|- ( ph -> ( ( ps /\ ch ) <-> th ) )
2	1	biimpd	|- ( ph -> ( ( ps /\ ch ) -> th ) )
3	2	3impib	|- ( ( ph /\ ps /\ ch ) -> th )