fact: Definition hor_sq_identity {C : predoublecategory_sq_hor_data} {a b: C} (f: a -v-> b) : (sqq (hor_identity a) f f (hor_identity b)) := get_hor_sq_identity a b f.
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