Lemma commringfracrunit1 (X : commring) (S : @subabmonoid (ringmultabmonoid X)) : isrunit (commringfracop1 X S) (commringfracunel1 X S). Proof. intros. apply (weqlunitrunit (commringfracop1 X S) (commringfraccomm1 X S) (commringfracunel1 X S) (commringfraclunit1 X S)). Qed.
Require Import UniMath.Algebra.Groups. Require Import UniMath.MoreFoundations.Sets. Require Import UniMath.MoreFoundations.Orders.