--- /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 "ground/relocation/gr_tls.ma".
+include "ground/relocation/gr_isi_tl.ma".
+
+(* IDENTITY CONDITION FOR GENERIC RELOCATION MAPS ***********************************************************)
+
+(* Properties with iterated tail ********************************************)
+
+(*** isid_tls *)
+lemma gr_isi_tls (n) (f): 𝐈❪f❫ → 𝐈❪⫱*[n]f❫.
+#n @(nat_ind_succ … n) -n /3 width=1 by gr_isi_tl/
+qed.