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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_id.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_id.ma
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index e292db157..000000000
--- a/matita/matita/contribs/lambdadelta/ground/relocation/gr_id.ma
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@@ -1,32 +0,0 @@
-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||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/notation/functions/element_i_0.ma".
-include "ground/relocation/gr_map.ma".
-
-(* IDENTITY ELEMENT FOR GENERIC RELOCATION MAPS *****************************)
-
-(*** id *)
-corec definition gr_id: gr_map ≝ ⫯gr_id.
-
-interpretation
-  "identity element (generic relocation streams)"
-  'ElementI = (gr_id).
-
-(* Basic constructions (specific) *******************************************)
-
-(*** id_rew *)
-lemma gr_id_unfold: ⫯𝐢 = 𝐢.
-<(stream_unfold … (𝐢)) in ⊢ (???%); //
-qed.