Definition lattice_bounded_def_2 (A : Set) (m : Map A) : Prop :=
  forall p : prechain bool,
  sas_chain bool (ensemble_base A m) lem p ->
  chain_length bool p <= S (MapCard A m).

Lemma lattice_bounded_6 : forall A : Set, lattice_bounded_def_2 A (M0 A).