--- /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 "basic_2/grammar/term_weight.ma".
+include "basic_2/relocation/lifts.ma".
+
+(* GENERIC TERM RELOCATION **************************************************)
+
+(* Forward lemmas on weight for terms ***************************************)
+
+(* Basic_2A1: includes: lift_fwd_tw *)
+lemma lifts_fwd_tw: ∀T1,T2,t. ⬆*[t] T1 ≡ T2 → ♯{T1} = ♯{T2}.
+#T1 #T2 #t #H elim H -T1 -T2 -t normalize //
+qed-.