Theorem bi13impia

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

	Ref	Expression
Hypothesis	bi13impia.1	|- ( ( ph /\ ps ) <-> ( ch -> th ) )
Assertion	bi13impia	|- ( ( ph /\ ps /\ ch ) -> th )

Proof

Step	Hyp	Ref	Expression
1		bi13impia.1	|- ( ( ph /\ ps ) <-> ( ch -> th ) )
2	1	biimpi	|- ( ( ph /\ ps ) -> ( ch -> th ) )
3	2	3impia	|- ( ( ph /\ ps /\ ch ) -> th )