Definition Comp_Dual := Build_Comp Comp_dual_congl Comp_dual_congr.

(* Specifications: *)
Lemma Assoc_Dual : Assoc_law Comp_Dual.
Lemma Idl_Dual : Idl_law (Hom:=DHom) Comp_Dual (Id (c:=C)).
Lemma Idr_Dual : Idr_law (Hom:=DHom) Comp_Dual (Id (c:=C)).