--- /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_uni.ma".
+include "ground/relocation/gr_isi_id.ma".
+
+(* IDENTITY CONDITION FOR GENERIC RELOCATION MAPS ***********************************************************)
+
+(* Properties with test for identity ****************************************)
+
+(*** uni_inv_isid uni_isi *)
+lemma gr_uni_isi (f): đźâšđ⩠⥠f â đâȘfâ«.
+/2 width=1 by gr_eq_id_isi/ qed.
+
+(* Inversion lemmas with test for identity **********************************)
+
+(*** uni_isid isi_inv_uni *)
+lemma gr_isi_inv_uni (f): đâȘfâ« â đźâšđ⩠⥠f.
+/2 width=1 by gr_isi_inv_eq_id/ qed-.