--- /dev/null
+(**************************************************************************)
+(* ___ *)
+(* ||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-.