proposition: Lemma is_precategory_rig_precategory_data : is_precategory rig_precategory_data.
proof: Proof. use make_is_precategory_one_assoc. - intros a b f. use rig_id_left. - intros a b f. use rig_id_right. - intros a b c d f g h. use rig_assoc. Qed.
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