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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cpm_tdeq.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cpm_tdeq.ma
deleted file mode 100644
index 7f05e3b1c..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cpm_tdeq.ma
+++ /dev/null
@@ -1,46 +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/tdeq.ma".
-include "basic_2/rt_transition/cpm_drops.ma".
-
-(* T-BOUND CONTEXT-SENSITIVE PARALLEL RT-TRANSITION FOR TERMS ***************)
-
-(* Inversion lemmas with sort-irrelevant equivalence for terms **************)
-
-lemma cpm_tdeq_inv_lref_sn (n) (h) (G) (L) (i):
-                           ∀X.  ⦃G,L⦄ ⊢ #i ➡[n,h] X → #i ≛ X →
-                           ∧∧ X = #i & n = 0.
-#n #h #G #L #i #X #H1 #H2
-lapply (tdeq_inv_lref1 … H2) -H2 #H destruct
-elim (cpm_inv_lref1_drops … H1) -H1 // * [| #m ]
-#K #V1 #V2 #_ #_ #H -V1
-elim (lifts_inv_lref2_uni_lt … H) -H //
-qed-.
-
-lemma cpm_tdeq_inv_atom_sn (n) (h) (I) (G) (L):
-                           ∀X. ⦃G,L⦄ ⊢ ⓪{I} ➡[n,h] X → ⓪{I} ≛ X →
-                           ∨∨ ∧∧ X = ⓪{I} & n = 0
-                            | ∃∃s. X = ⋆(⫯[h]s) & I = Sort s & n = 1.
-#n #h * #s #G #L #X #H1 #H2
-[ elim (cpm_inv_sort1 … H1) -H1
-  cases n -n [| #n ] #H #Hn destruct -H2
-  [ /3 width=1 by or_introl, conj/
-  | <(le_n_O_to_eq n) [| /2 width=3 by le_S_S_to_le/ ] -n
-    /3 width=3 by ex3_intro, or_intror/
-  ]
-| elim (cpm_tdeq_inv_lref_sn … H1 H2) -H1 -H2 /3 width=1 by or_introl, conj/
-| elim (cpm_inv_gref1 … H1) -H1 -H2 /3 width=1 by or_introl, conj/
-]
-qed-.