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