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). Proof. exists (rassociator_CAT X Y Z). split. - apply lassociator_rassociator_CAT. - apply rassociator_lassociator_CAT. Defined.
Require Import UniMath.Foundations.PartD. Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.NaturalTransformations. Require Import UniMath.CategoryTheory.FunctorCategory. Require Import UniMath.CategoryTheory.whiskering.