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diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_cpue.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_cpue.ma
deleted file mode 100644
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--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_cpue.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/rt_computation/cpms_cnu.ma".
-include "basic_2/rt_computation/cpue.ma".
-include "basic_2/dynamic/cnv_preserve.ma".
-
-(* CONTEXT-SENSITIVE NATIVE VALIDITY FOR TERMS ******************************)
-
-(* Properties with evaluation for t-unbound rt-transition on terms **********)
-
-lemma cnv_cpue_trans (a) (h) (G) (L):
-      ∀T1. ⦃G,L⦄ ⊢ T1 ![a,h] →
-      ∀T2. ⦃G,L⦄ ⊢ T1 ⥲*[h] 𝐍⦃T2⦄ → ⦃G,L⦄ ⊢ T2 ![a,h].
-#a #h #G #L #T1 #HT1 #T2 * #n #HT12 #_
-/2 width=4 by cnv_cpms_trans/
-qed-.
-
-lemma cnv_cpue_cpms_conf (a) (h) (n) (G) (L):
-      ∀T0. ⦃G,L⦄ ⊢ T0 ![a,h] → ∀T1. ⦃G,L⦄ ⊢ T0 ➡*[n,h] T1 →
-      ∀T2. ⦃G,L⦄ ⊢ T0 ⥲*[h] 𝐍⦃T2⦄ →
-      ∃∃T. ⦃G,L⦄ ⊢ T1 ⥲*[h] 𝐍⦃T⦄ & T2 ≅ T.
-#a #h #n1 #G #L #T0 #HT0 #T1 #HT01 #T2 * #n2 #HT02 #HT2
-elim (cnv_cpms_conf … HT0 … HT01 … HT02) -T0 #T0 #HT10 #HT20
-lapply (cpms_inv_cnu_sn … HT20 HT2) -HT20 #HT20
-/4 width=8 by cnu_tueq_trans, ex2_intro/
-qed-.
-
-(* Main properties with evaluation for t-unbound rt-transition on terms *****)
-
-theorem cnv_cpue_mono (a) (h) (G) (L):
-        ∀T0. ⦃G,L⦄ ⊢ T0 ![a,h] → ∀T1. ⦃G,L⦄ ⊢ T0 ⥲*[h] 𝐍⦃T1⦄ →
-        ∀T2. ⦃G,L⦄ ⊢ T0 ⥲*[h] 𝐍⦃T2⦄ → T1 ≅ T2.
-#a #h #G #L #T0 #HT0 #T1 * #n1 #HT01 #HT1 #T2 * #n2 #HT02 #HT2
-elim (cnv_cpms_conf … HT0 … HT01 … HT02) -T0 #T0 #HT10 #HT20
-/3 width=8 by cpms_inv_cnu_sn, tueq_canc_dx/
-qed-.