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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_isi_pat.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_isi_pat.ma
deleted file mode 100644
index a8c35fe0a..000000000
--- a/matita/matita/contribs/lambdadelta/ground/relocation/gr_isi_pat.ma
+++ /dev/null
@@ -1,39 +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/relocation/gr_isi_id.ma".
-include "ground/relocation/gr_pat_pat_id.ma".
-
-(* IDENTITY CONDITION FOR GENERIC RELOCATION MAPS ***************************)
-
-(* Advanced constructions with gr_isi ***************************************)
-
-(*** isid_at *)
-lemma gr_isi_pat (f): (∀i. @❪i,f❫ ≘ i) → 𝐈❪f❫.
-/3 width=1 by gr_eq_id_isi, gr_pat_inv_id/
-qed.
-
-(* Inversions with gr_pat ***************************************************)
-
-(*** isid_inv_at *)
-lemma gr_isi_inv_pat (f) (i): 𝐈❪f❫ → @❪i,f❫ ≘ i.
-/3 width=3 by gr_isi_inv_eq_id, gr_pat_id, gr_pat_eq_repl_back/
-qed-.
-
-(* Destructions with gr_pat *************************************************)
-
-(*** isid_inv_at_mono *)
-lemma gr_isi_pat_des (f) (i1) (i2): 𝐈❪f❫ → @❪i1,f❫ ≘ i2 → i1 = i2.
-/4 width=3 by gr_isi_inv_eq_id, gr_pat_id_des, gr_pat_eq_repl_fwd/
-qed-.