Theorem dmncrng

Description: Obsolete theorem, use idomcringd instead. A domain is a commutative ring. (Contributed by Jeff Madsen, 6-Jan-2011) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	dmncrng	|- ( R e. Dmn -> R e. CRingOps )

Proof

Step	Hyp	Ref	Expression
1		isdmn2	|- ( R e. Dmn <-> ( R e. PrRing /\ R e. CRingOps ) )
2	1	simprbi	|- ( R e. Dmn -> R e. CRingOps )