Definition DFunctor_ob : Dual A -> Dual B := fun a : A => F a.Definition DFunctor_map (b a : A) := FMap F a b.

(* Specifications: *)
Lemma DFunctor_comp_law : Fcomp_law (FOb:=DFunctor_ob) DFunctor_map.
Lemma DFunctor_id_law : Fid_law (FOb:=DFunctor_ob) DFunctor_map.