fact: Definition lassociator_CAT_pointwise_is_z_iso {C D E F : category} (X : functor C D)(Y : functor D E)(Z : functor E F) : is_z_isomorphism (lassociator_CAT X Y Z).
imports: UniMath.Foundations.PartD UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.whiskering