fact: Definition isringfuntocommringfrac (X : commring) (S : @subabmonoid (ringmultabmonoid X)) : @isringfun X (commringfrac X S) (tocommringfrac X S) := make_dirprod (isaddmonoidfuntocommringfrac X S) (ismultmonoidfuntocommringfrac X S).
imports: UniMath.Algebra.Groups UniMath.MoreFoundations.Sets UniMath.MoreFoundations.Orders UniMath.Algebra.Monoids