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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_isf_tls.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_isf_tls.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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+include "ground/relocation/gr_tls.ma".
+include "ground/relocation/gr_isf_tl.ma".
+
+(* FINITE COLENGTH CONDITION FOR GENERIC RELOCATION MAPS *)
+
+(* Properties with iterated tail **************************************)
+
+lemma gr_isf_tls (n) (f): 𝐅❪f❫ → 𝐅❪⫱*[n]f❫.
+#n @(nat_ind_succ … n) -n /3 width=1 by gr_isf_tl/
+qed.
+
+(* Inversion lemmas with iterated tail **************************************)
+
+(*** isfin_inv_tls *)
+lemma gr_isf_inv_tls (n) (g): 𝐅❪⫱*[n]g❫ → 𝐅❪g❫.
+#n @(nat_ind_succ … n) -n /3 width=1 by gr_isf_inv_tl/
+qed-.