fact: Definition eqrelcommringfrac (X : commring) (S : @subabmonoid (ringmultabmonoid X)) : eqrel (X × S) := eqrelabmonoidfrac (ringmultabmonoid X) S.
imports: UniMath.Algebra.Groups UniMath.MoreFoundations.Sets UniMath.MoreFoundations.Orders UniMath.Algebra.Monoids