fact: Definition compose2h_iso {C : prebicategory_id_comp} {a b c : C} {f f' : a -1-> b} {g g' : b -1-> c} (alpha : z_iso f f') (beta : z_iso g g') : z_iso (f ;1; g) (f' ;1; g').
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