proposition: Lemma is_univalent_CONE : is_univalent (CONE F).
proof: Proof. intros a b. apply (isweq_iso _ (@isotoid_CONE a b)). apply isotoid_CONE_idtoiso. apply idtoiso_isotoid_CONE. Defined.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors