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diff --git a/matita/contribs/LOGIC/datatypes/Proof.ma b/matita/contribs/LOGIC/datatypes/Proof.ma
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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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+set "baseuri" "cic:/matita/LOGIC/datatypes/Proof".
+
+(* PROOFS
+   - Naming policy:
+     - proofs: p q r s
+*)
+
+include "preamble.ma".
+
+inductive Proof: Type \def
+   | lref: Nat \to Proof
+   | parx: Nat \to Proof
+   | impw: Proof \to Proof
+   | impi: Proof \to Proof
+   | impe: Proof \to Proof
+(*   
+   | impe: Proof \to Proof \to Proof \to Proof
+*)
+.