proposition: Lemma isaprop_is_functor (C C' : precategory_data) (hs: has_homsets C') (F : functor_data C C') : isaprop (is_functor F).
proof: Proof. apply isofhleveldirprod. apply impred; intro. apply hs. do 5 (apply impred; intro). apply hs. Qed.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.MoreFoundations.Univalence UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.TransportMorphisms UniMath.CategoryTheory.Core.Univalence