Lemma isunital1funtocommringfrac (X : commring) (S : @subabmonoid (ringmultabmonoid X)) : (tocommringfrac X S 0) = 0. Proof. intros. apply idpath. Qed.
Require Import UniMath.Algebra.Groups. Require Import UniMath.MoreFoundations.Sets. Require Import UniMath.MoreFoundations.Orders.