apply (#‡(id_neutral_left2 : ?));]
qed.
+definition btop_carr: BTop → Type1 ≝ λo:BTop. carr1 (oa_P (carrbt o)).
+coercion btop_carr.
+
(*
(*CSC: unused! *)
(* this proof is more logic-oriented than set/lattice oriented *)
[2,4: intros; apply saturation_monotone; try (apply A_is_saturation); apply Hcut;]
apply Hcut2; assumption.
qed.
-*)
\ No newline at end of file
+*)