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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_isi_tl.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_isi_tl.ma
deleted file mode 100644
index 0246557f3..000000000
--- a/matita/matita/contribs/lambdadelta/ground/relocation/gr_isi_tl.ma
+++ /dev/null
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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/relocation/gr_tl.ma".
-include "ground/relocation/gr_isi.ma".
-
-(* IDENTITY CONDITION FOR GENERIC RELOCATION MAPS ***************************)
-
-(* Constructions with gr_tl *************************************************)
-
-(*** isid_tl *)
-lemma gr_isi_tl (f): 𝐈❪f❫ → 𝐈❪⫰f❫.
-#f cases (gr_map_split_tl f) * #H
-[ /2 width=3 by gr_isi_inv_push/
-| elim (gr_isi_inv_next … H) -H //
-]
-qed.