proposition: Lemma is_z_isomorphism_to_is_cat_iso_eq_r (y : D) : F(G y) = y.
proof: Proof. exact (path_functor_ob (z_iso_after_z_iso_inv F_iso) y). Defined.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Setcategories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.catiso UniMath.CategoryTheory.CategoryEquality