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diff --git a/matita/matita/contribs/lambdadelta/ground/wf_ind/wf2_ind_nlt.ma b/matita/matita/contribs/lambdadelta/ground/wf_ind/wf2_ind_nlt.ma
deleted file mode 100644
index 492c84cdb..000000000
--- a/matita/matita/contribs/lambdadelta/ground/wf_ind/wf2_ind_nlt.ma
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@@ -1,30 +0,0 @@
-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||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/arith/nat_lt.ma".
-
-(* WELL-FOUNDED INDUCTION ***************************************************)
-
-fact wf2_ind_nlt_aux (A1) (A2) (f:A1→A2→nat) (Q:relation2 …):
-     (∀n. (∀a1,a2. f a1 a2 < n → Q a1 a2) → ∀a1,a2. f a1 a2 = n → Q a1 a2) →
-     ∀n,a1,a2. f a1 a2 = n → Q a1 a2.
-#A1 #A2 #f #Q #H #n @(nat_ind_lt … n) -n /3 width=3 by/
-qed-.
-
-(*** f2_ind *)
-lemma wf2_ind_nlt (A1) (A2) (f:A1→A2→nat) (Q:relation2 …):
-      (∀n. (∀a1,a2. f a1 a2 < n → Q a1 a2) → ∀a1,a2. f a1 a2 = n → Q a1 a2) →
-      ∀a1,a2. Q a1 a2.
-#A1 #A2 #f #Q #H #a1 #a2 @(wf2_ind_nlt_aux … H) -H //
-qed-.