Theorem ancomst

Description: Closed form of ancoms . (Contributed by Alan Sare, 31-Dec-2011)

	Ref	Expression
Assertion	ancomst	|- ( ( ( ph /\ ps ) -> ch ) <-> ( ( ps /\ ph ) -> ch ) )

Proof

Step	Hyp	Ref	Expression
1		ancom	|- ( ( ph /\ ps ) <-> ( ps /\ ph ) )
2	1	imbi1i	|- ( ( ( ph /\ ps ) -> ch ) <-> ( ( ps /\ ph ) -> ch ) )