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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/rtmap_at_uni.ma b/matita/matita/contribs/lambdadelta/ground/relocation/rtmap_at_uni.ma
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-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||M||                                                             *)
-(*      ||A||       A project by Andrea Asperti                           *)
-(*      ||T||                                                             *)
-(*      ||I||       Developers:                                           *)
-(*      ||T||         The HELM team.                                      *)
-(*      ||A||         http://helm.tcs.unibo.it                            *)
-(*      \   /                                                             *)
-(*       \ /        This file is distributed under the terms of the       *)
-(*        v         GNU General Public License Version 2                  *)
-(*                                                                        *)
-(**************************************************************************)
-
-include "ground/arith/nat_rplus_succ.ma".
-include "ground/relocation/rtmap_uni.ma".
-include "ground/relocation/rtmap_at.ma".
-
-(* RELOCATION MAP ***********************************************************)
-
-(* Properties with uniform relocations **************************************)
-
-lemma at_uni: ∀n,i. @❪i,𝐔❨n❩❫ ≘ i+n.
-#n @(nat_ind_succ … n) -n /2 width=5 by at_next/
-qed.
-
-(* Inversion lemmas with uniform relocations ********************************)
-
-lemma at_inv_uni: ∀n,i,j. @❪i,𝐔❨n❩❫ ≘ j → j = i+n.
-/2 width=4 by at_mono/ qed-.