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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_sle_tls.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_sle_tls.ma
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index 000000000..102c37ceb
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+++ b/matita/matita/contribs/lambdadelta/ground/relocation/gr_sle_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_sle.ma".
+
+(* INCLUSION FOR GENERIC RELOCATION MAPS ***********************************************************)
+
+(* Properties with iterated tail ********************************************)
+
+(*** sle_tls *)
+lemma gr_sle_tls:
+      ∀f1,f2. f1 ⊆ f2 → ∀n. ⫱*[n] f1 ⊆ ⫱*[n] f2.
+#f1 #f2 #Hf12 #n @(nat_ind_succ … n) -n
+/2 width=5 by gr_sle_tl/
+qed.