Theorem ringmgp

Description: A ring is a monoid under multiplication. (Contributed by Mario Carneiro, 6-Jan-2015)

	Ref	Expression
Hypothesis	ringmgp.g	|- G = ( mulGrp ` R )
Assertion	ringmgp	|- ( R e. Ring -> G e. Mnd )

Proof

Step	Hyp	Ref	Expression
1		ringmgp.g	|- G = ( mulGrp ` R )
2		eqid	|- ( Base ` R ) = ( Base ` R )
3		eqid	|- ( +g ` R ) = ( +g ` R )
4		eqid	|- ( .r ` R ) = ( .r ` R )
5	2 1 3 4	isring	|- ( R e. Ring <-> ( R e. Grp /\ G e. Mnd /\ A. x e. ( Base ` R ) A. y e. ( Base ` R ) A. z e. ( Base ` R ) ( ( x ( .r ` R ) ( y ( +g ` R ) z ) ) = ( ( x ( .r ` R ) y ) ( +g ` R ) ( x ( .r ` R ) z ) ) /\ ( ( x ( +g ` R ) y ) ( .r ` R ) z ) = ( ( x ( .r ` R ) z ) ( +g ` R ) ( y ( .r ` R ) z ) ) ) ) )
6	5	simp2bi	|- ( R e. Ring -> G e. Mnd )