fact: Definition has_hor_sq_homsets (C : predoublecategory_hor_sq) : UU := ∏ (a b c d: C) (f: a -v-> b) (g: c -v-> d), isaset (und_ver_cat_ob_mor C (get_und_ver_cat_ob f) (get_und_ver_cat_ob g)).
imports: UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.MoreFoundations.Notations UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Univalence