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diff --git a/matita/matita/contribs/lambda_delta/basic_2/unfold/delift_ltpss.ma b/matita/matita/contribs/lambda_delta/basic_2/unfold/delift_ltpss.ma
deleted file mode 100644
index a0ac3cf47..000000000
--- a/matita/matita/contribs/lambda_delta/basic_2/unfold/delift_ltpss.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/unfold/ltpss_sn_alt.ma".
-include "basic_2/unfold/delift.ma".
-
-(* INVERSE BASIC TERM RELOCATION  *******************************************)
-
-(* Properties on sn partial unfold on local environments ********************)
-
-lemma delift_ltpss_sn_conf_eq: ∀L,T1,T2,d,e. L ⊢ ▼*[d, e] T1 ≡ T2 →
-                               ∀K. L ⊢ ▶* [d, e] K → K ⊢ ▼*[d, e] T1 ≡ T2.
-#L #T1 #T2 #d #e * #T #HT1 #HT2 #K #HLK
-elim (ltpss_sn_tpss_conf … HT1 … HLK) -HT1 -HLK #T0 #HT10 #HT0
-lapply (tpss_inv_lift1_eq … HT0 … HT2) -HT0 #H destruct /2 width=3/
-qed.
-
-lemma ltpss_sn_delift_trans_eq: ∀L,K,d,e. L ⊢ ▶* [d, e] K →
-                                ∀T1,T2. K ⊢ ▼*[d, e] T1 ≡ T2 → L ⊢ ▼*[d, e] T1 ≡ T2.
-#L #K #d #e #HLK #T1 #T2 * #T #HT1 #HT2 
-lapply (ltpss_sn_tpss_trans_eq … HT1 … HLK) -K /2 width=3/
-qed.