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diff --git a/matita/matita/contribs/lambda_delta/basic_2/etc/csup/csups_csups.etc b/matita/matita/contribs/lambda_delta/basic_2/etc/csup/csups_csups.etc
deleted file mode 100644
index aa54d9bef..000000000
--- a/matita/matita/contribs/lambda_delta/basic_2/etc/csup/csups_csups.etc
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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/substitution/csup_csup.ma".
-include "basic_2/unfold/csups.ma".
-
-(* STAR-ITERATED SUPCLOSURE *************************************************)
-
-(* Advanced forward lemmas **************************************************)
-
-(*
-lemma csupp_strap2_fwd_refl: ∀L,L0,T1,T2. ⦃L, T1⦄ > ⦃L0, T2⦄ →
-                             ∀T3. ⦃L0, T2⦄ >+ ⦃L, T3⦄ →
-                             L = L0 ∨ ⦃L, T1⦄ >+ ⦃L, T3⦄.
-#L #L0 #T1 #T2 * -L -L0 -T1 -T2 /2 width=1/
-[ #I #L0 #K0 #V0 #i #HLK0 #T3 #H
-  lapply (ldrop_pair2_fwd_cw … HLK0 T3) -HLK0 #H1
-  lapply (csupp_fwd_cw … H) -H #H2
-  lapply (transitive_lt … H1 H2) -H1 -H2 #H
-  elim (lt_refl_false … H)
-| #a #I #L0 #V2 #T2 #T3 #HT23
-  /3 width=5/
-
-  elim (csup_inv_ldrop … HT23 I V2 0 ?) -HT23 // #H1 #H2 destruct /2 width=1/
-  qed-.
-
-
-
-
-
-
-
-
-lemma csups_strap1_fwd_refl: ∀L,L0,T1,T2. ⦃L, T1⦄ >* ⦃L0, T2⦄ →
-                             ∀T3. ⦃L0, T2⦄ > ⦃L, T3⦄ → L = L0.
-#L #L0 #T1 #T2 #H @(csups_ind_dx … H) -L -T1 //
-#L1 #L #T1 #T #HL1 #_ #IHL0 #T3 #HL0
-lapply (csup_trans_fwd_refl … HL10) … HL0) -T2
-*) 
-lemma lift_csups_trans_aux: ∀T1,U1,d,e. ⇧[d, e] T1 ≡ U1 →
-                            ∀L1,L2,U2. ⦃L1, U1⦄ >* ⦃L2, U2⦄ → L1 = L2 →
-                            ∃T2. ⇧[d, e] T2 ≡ U2.
-#T1 #U1 #d #e #HTU1 #L1 #L2 #U2 #H @(csups_ind … H) -L2 -U2 /2 width=2/ -T1
-#L #L2 #U #U2 #HL1 #HL2 #IHL1 #H destruct
-
-* -T1 -U1 -d -e
-
-(* Main propertis ***********************************************************)
-
-theorem csups_trans: bi_transitive … csups.
-/2 width=4/ qed.