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diff --git a/matita/matita/contribs/lambda_delta/basic_2/unfold/gr2_gr2.ma b/matita/matita/contribs/lambda_delta/basic_2/unfold/gr2_gr2.ma
deleted file mode 100644
index 20ce856d6..000000000
--- a/matita/matita/contribs/lambda_delta/basic_2/unfold/gr2_gr2.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/unfold/gr2.ma".
-
-(* GENERIC RELOCATION WITH PAIRS ********************************************)
-
-(* Main properties **********************************************************)
-
-theorem at_mono: ∀des,i,i1. @⦃i, des⦄ ≡ i1 → ∀i2. @⦃i, des⦄ ≡ i2 → i1 = i2.
-#des #i #i1 #H elim H -des -i -i1
-[ #i #x #H <(at_inv_nil … H) -x //
-| #des #d #e #i #i1 #Hid #_ #IHi1 #x #H
-  lapply (at_inv_cons_lt … H Hid) -H -Hid /2 width=1/
-| #des #d #e #i #i1 #Hdi #_ #IHi1 #x #H
-  lapply (at_inv_cons_ge … H Hdi) -H -Hdi /2 width=1/
-]
-qed-.