proposition: Lemma isaprop_is_bifunctor (F : bifunctor_data) : isaprop (is_bifunctor F).
proof: Proof. repeat (apply isapropdirprod) ; try (repeat (apply impred_isaprop ; intro) ; apply homset_property). Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.PrecategoryBinProduct UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Limits.BinCoproducts UniMath.CategoryTheory.Limits.Coproducts UniMath.CategoryTheory.ProductCategory