proposition: Lemma op_nt_is_z_iso {C D : category} {f g : functor C D} (a : nat_trans f g) (is : is_nat_z_iso a) : is_nat_z_iso (op_nt a).
proof: Proof. intro c. use opp_is_z_isomorphism. exact (is c). Defined.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.FunctorCategory