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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+include "Ground_2/list.ma".
+include "Basic_2/grammar/term.ma".
+
+(* GLOBAL ENVIRONMENTS ******************************************************)
+
+(* global environments *)
+definition genv ≝ list2 bind2 term.
+
+interpretation "sort (global environment)"
+   'Star = (nil2 bind2 term).
+
+interpretation "environment binding construction (binary)"
+   'DBind L I T = (cons2 bind2 term I T L).
+
+(* Basic properties *********************************************************)
+
+axiom genv_eq_dec: ∀T1,T2:genv. Decidable (T1 = T2).