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diff --git a/matita/matita/contribs/lambdadelta/basic_2/relocation/lifts_weight_bind.ma b/matita/matita/contribs/lambdadelta/basic_2/relocation/lifts_weight_bind.ma
new file mode 100644
index 000000000..152ecbba1
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+++ b/matita/matita/contribs/lambdadelta/basic_2/relocation/lifts_weight_bind.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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/syntax/bind_weight.ma".
+include "basic_2/relocation/lifts_weight.ma".
+include "basic_2/relocation/lifts_bind.ma".
+
+(* GENERIC RELOCATION FOR BINDERS *******************************************)
+
+(* Forward lemmas with weight for binders ***********************************)
+
+lemma liftsb_fwd_bw: ∀f,I1,I2. ⬆*[f] I1 ≡ I2 → ♯{I1} = ♯{I2}.
+#f #I1 #I2 * -I1 -I2 /2 width=2 by lifts_fwd_tw/
+qed-.