--- /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 "static_2/syntax/term_weight.ma".
+include "static_2/relocation/lifts.ma".
+
+(* GENERIC RELOCATION FOR TERMS *********************************************)
+
+(* Forward lemmas with weight for terms *************************************)
+
+(* Basic_2A1: includes: lift_fwd_tw *)
+lemma lifts_fwd_tw: ∀f,T1,T2. ⬆*[f] T1 ≘ T2 → ♯{T1} = ♯{T2}.
+#f #T1 #T2 #H elim H -f -T1 -T2 normalize //
+qed-.