Lemma commringfraccomm2 (X : commring) (S : @subabmonoid (ringmultabmonoid X)) : iscomm (commringfracop2 X S). Proof. intros. apply (commax (abmonoidfrac (ringmultabmonoid X) S)). Qed.
Require Import UniMath.Algebra.Groups. Require Import UniMath.MoreFoundations.Sets. Require Import UniMath.MoreFoundations.Orders.