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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnu_cnu.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnu_cnu.ma
deleted file mode 100644
index 2bc4d3c2d..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnu_cnu.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 "static_2/syntax/tueq_tueq.ma".
-include "basic_2/rt_transition/cpm_tueq.ma".
-include "basic_2/rt_transition/cnu.ma".
-
-(* NORMAL TERMS FOR T-UNUNBOUND RT-TRANSITION *******************************)
-
-(* Advanced properties ******************************************************)
-
-lemma cnu_tueq_trans (h) (G) (L):
-      ∀T1. ⦃G,L⦄ ⊢ ⥲[h] 𝐍⦃T1⦄ → ∀T2.T1 ≅ T2 → ⦃G,L⦄ ⊢ ⥲[h] 𝐍⦃T2⦄.
-#h #G #L #T1 #HT1 #T2 #HT12 #n #T0 #HT20
-@(tueq_canc_sn … HT12)
-elim (tueq_cpm_trans … HT12 … HT20) -T2 #T2 #HT13 #HT30
-/3 width=3 by tueq_trans/
-qed-.