fact: Definition Zmax_min_de_morgan : forall x y : Z, -(Z.max x y) = Z.min (-x) (-y) := @antitone_join_meet_distr Zto _ Zopp_le_compat.
imports: Coq.ZArith.Zmin Coq.ZArith.Zmax Coq.ZArith.ZArith CoRN.order.TotalOrder