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diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc/tdpos/cnv_cpm_tdpos.etc b/matita/matita/contribs/lambdadelta/basic_2/etc/tdpos/cnv_cpm_tdpos.etc
deleted file mode 100644
index 4cb320959..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/etc/tdpos/cnv_cpm_tdpos.etc
+++ /dev/null
@@ -1,55 +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 "static_2/syntax/tdpos.ma".
-include "basic_2/dynamic/cnv_cpm_tdeq.ma".
-
-(* CONTEXT-SENSITIVE NATIVE VALIDITY FOR TERMS ******************************)
-
-(* Forward lemmas with positive rt-transition for terms *********************)
-
-lemma cpm_tdeq_fwd_tdpos_sn (a) (h) (o) (n) (G):
-                            ∀L,T1. ⦃G,L⦄ ⊢ T1 ![a,h] →
-                            ∀T2. ⦃G,L⦄ ⊢ T1 ➡[n,h] T2 → T1 ≛[h,o] T2 → 𝐏[h,o]⦃T1⦄ →
-                            ∧∧ T1 = T2 & 0 = n.
-#a #h #o #n #G #L #T1 #H0 #T2 #H1 #H2
-@(cpm_tdeq_ind … H0 … H1 H2) -L -T1 -T2
-[ /2 width=1 by conj/
-| #L #s #_ #H1 #H
-  elim (tdpos_inv_sort … H) -H #d #H2
-  lapply (deg_mono … H2 H1) -H1 -H2 #H destruct
-| #p #I #L #V #T1 #_ #_ #T2 #_ #_ #IH #H
-  elim (tdpos_inv_pair … H) -H #_ #HT1
-  elim IH // -IH -HT1 #H1 #H2 destruct
-  /2 width=1 by conj/
-| #m #_ #L #V #_ #W #_ #q #T1 #U1 #_ #_ #T2 #_ #_ #IH #H -a -m -q -G -L -W -U1
-  elim (tdpos_inv_pair … H) -H #_ #HT1
-  elim IH // -IH -HT1 #H1 #H2 destruct
-  /2 width=1 by conj/
-| #L #U0 #U1 #T1 #_ #_ #U2 #_ #_ #_ #T2 #_ #_ #_ #IHU #IHT #H
-  elim (tdpos_inv_pair … H) -H #HU1 #HT1
-  elim IHU // -IHU -HU1 #H1 #H2 destruct
-  elim IHT // -IHT -HT1 #H1 #H2 destruct
-  /2 width=1 by conj/
-]
-qed-.
-
-lemma cpm_fwd_tdpos_sn (a) (h) (o) (n) (G) (L):
-                       ∀T1. ⦃G,L⦄ ⊢ T1 ![a,h] → 𝐏[h,o]⦃T1⦄ →
-                       ∀T2. ⦃G,L⦄ ⊢ T1 ➡[n,h] T2 →
-                       ∨∨ ∧∧ T1 = T2 & 0 = n | (T1 ≛[h,o] T2 → ⊥).
-#a #h #o #n #G #L #T1 #H1T1 #H2T1 #T2 #HT12
-elim (tdeq_dec h o T1 T2) #H
-/3 width=9 by cpm_tdeq_fwd_tdpos_sn, or_intror, or_introl/
-qed-.