Theorem biimpa

Description: Importation inference from a logical equivalence. (Contributed by NM, 3-May-1994)

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

Proof

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