fact: Definition mod_category : category := make_category mod_precategory has_homsets_mod.
imports: UniMath.Algebra.Groups UniMath.Algebra.RigsAndRings UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.Algebra.Modules UniMath.Algebra.Modules.Examples UniMath.CategoryTheory.Limits.Zero