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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/unwind/preunwind2_rmap_eq.ma b/matita/matita/contribs/lambdadelta/delayed_updating/unwind/preunwind2_rmap_eq.ma
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+++ b/matita/matita/contribs/lambdadelta/delayed_updating/unwind/preunwind2_rmap_eq.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 "delayed_updating/unwind/preunwind2_rmap.ma".
+include "ground/relocation/tr_compose_eq.ma".
+include "ground/relocation/tr_pn_eq.ma".
+
+(* TAILED PREUNWIND FOR RELOCATION MAP **************************************)
+
+(* Constructions with tr_map_eq *********************************************)
+
+lemma preunwind2_rmap_eq_repl (l):
+      stream_eq_repl … (λf1,f2. ▶[f1]l ≗ ▶[f2]l).
+* // #k #f1 #f2 #Hf
+/2 width=1 by tr_compose_eq_repl/
+qed-.