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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_rmap_guard.ma b/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_rmap_guard.ma
new file mode 100644
index 000000000..bdf843577
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_rmap_guard.ma
@@ -0,0 +1,32 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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/unwind2_rmap.ma".
+include "delayed_updating/syntax/path_guard.ma".
+include "ground/relocation/nap.ma".
+
+(* TAILED UNWIND FOR RELOCATION MAP *****************************************)
+
+(* Destructions with pgc ****************************************************)
+
+lemma unwind2_rmap_push_guard (f) (p):
+      p ϵ 𝐆 → ⫯⇂▶[⫯f]p = ▶[⫯f]p.
+#f #p * //
+qed-.
+
+lemma nap_zero_unwind2_rmap_push_guard (f) (p):
+      p ϵ 𝐆 → 𝟎 = ▶[⫯f]p＠§❨𝟎❩.
+#f #p #Hp
+<(unwind2_rmap_push_guard … Hp) -Hp //
+qed-.