proposition: Lemma commrig_equiv_iso (X Y : ob commrig_category) : rigiso (X : commrig) (Y : commrig) -> z_iso X Y.
proof: Proof. intros f. exact (_,,commrig_equiv_is_z_iso X Y f). Defined.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.Foundations.UnivalenceAxiom UniMath.Algebra.BinaryOperations UniMath.Algebra.Monoids UniMath.Algebra.RigsAndRings UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence