proposition: Lemma commringfracrunit1 (X : commring) (S : @subabmonoid (ringmultabmonoid X)) : isrunit (commringfracop1 X S) (commringfracunel1 X S).
proof: Proof. intros. apply (weqlunitrunit (commringfracop1 X S) (commringfraccomm1 X S) (commringfracunel1 X S) (commringfraclunit1 X S)). Defined.
imports: UniMath.Algebra.Groups UniMath.MoreFoundations.Sets UniMath.MoreFoundations.Orders UniMath.Algebra.Monoids