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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_isf_isu.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_isf_isu.ma
deleted file mode 100644
index ab1c16f11..000000000
--- a/matita/matita/contribs/lambdadelta/ground/relocation/gr_isf_isu.ma
+++ /dev/null
@@ -1,26 +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_isu.ma".
-include "ground/relocation/gr_isf.ma".
-
-(* FINITE COLENGTH CONDITION FOR GENERIC RELOCATION MAPS ********************)
-
-(* Constructions with gr_isu ************************************************)
-
-(*** isuni_fwd_isfin *)
-lemma gr_isf_isu (f): 𝐔❪f❫ → 𝐅❪f❫.
-#f #H elim H -f
-/3 width=1 by gr_isf_next, gr_isf_isi/
-qed.