proposition: Lemma eq_ptd_mor_cat {F G : category_Ptd} (a b : F --> G) : a = b ≃ (a : ptd_mor F G) = b.
proof: Proof. use tpair. intro H. exact H. apply idisweq. Defined.
imports: UniMath.Foundations.PartD UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.FunctorCategory