fact: Definition assoc_hor {C : predoublecategory_hor} {a b c d : C} (f : a -h-> b) (g : b -h-> c) (h : c -h-> d) : f ·h (g ·h h) = (f ·h g) ·h h := get_assoc_hor C a b c d f g h.
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