proposition: Lemma image_is_in_image (C D : precategory) (F : functor C D) (a : ob C): is_in_img_functor F (F a).
proof: Proof. apply hinhpr. exists a. apply identity_z_iso. Defined.
imports: UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Subcategory.Core