proposition: Lemma isaprop_ConeProp (a : ConeData) : isaprop (ConeProp a).
proof: Proof. repeat (apply impred; intro). apply C. Qed.
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