fact: Definition po_category (PO : po X) : category := make_category (po_precategory PO) (po_precategory_has_homsets PO).
imports: UniMath.Foundations.HLevels UniMath.Foundations.Sets UniMath.Foundations.Propositions UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence