+(**************************************************************************)
+(* ___ *)
+(* ||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 "basic_2/unfold/tpss_tpss.ma".
+include "basic_2/unfold/delift.ma".
+
+(* INVERSE BASIC TERM RELOCATION *******************************************)
+
+(* Main properties **********************************************************)
+
+theorem delift_mono: ∀L,T,T1,T2,d,e.
+ L ⊢ ▼*[d, e] T ≡ T1 → L ⊢ ▼*[d, e] T ≡ T2 → T1 = T2.
+#L #T #T1 #T2 #d #e * #U1 #H1TU1 #H2TU1 * #U2 #H1TU2 #H2TU2
+elim (tpss_conf_eq … H1TU1 … H1TU2) -T #U #HU1 #HU2
+lapply (tpss_inv_lift1_eq … HU1 … H2TU1) -HU1 #H destruct
+lapply (tpss_inv_lift1_eq … HU2 … H2TU2) -HU2 #H destruct
+lapply (lift_inj … H2TU1 … H2TU2) //
+qed-.