fact: Definition associator_2mor {C : prebicategory_data} {a b c d : C} (f : a -1-> b) (g : b -1-> c) (h : c -1-> d) : (f ;1; (g ;1; h)) -2-> ((f ;1; g) ;1; h) := associator_trans a b c d (make_catbinprod f (make_catbinprod g h)).
imports: UniMath.Foundations.PartD UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.PrecategoryBinProduct UniMath.CategoryTheory.Categories.StandardCategories UniMath.CategoryTheory.HorizontalComposition UniMath.CategoryTheory.Equivalences.Core