(* autre correction a verifier : appartenance du dernier etat *)

Definition addr_in_preDTA (d : preDTA) (a : ad) : Prop :=
  exists s : state, MapGet state d a = Some s.Definition DTA_main_state_correct (d : DTA) : Prop :=
  match d with
  | dta p a => addr_in_preDTA p a
  end.Definition DTA_main_state_correct_check (d : DTA) : bool :=
  match d with
  | dta p a =>
      match MapGet state p a with
      | None => false
      | Some _ => true
      end
  end.

Lemma DTA_main_state_correct_check_correct : forall d : DTA, DTA_main_state_correct d -> DTA_main_state_correct_check d = true.