Ltac Yoneda := apply Yoneda_Iso.

(** The dual of Yoneda is conservative of isomorphisms. *)
Theorem CoYoneda_Iso (C : Category) : forall (c c' : Obj),
((CoYoneda C) _o c ≃ (CoYoneda C) _o c')%isomorphism → (c ≃ c')%isomorphism.