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diff --git a/matita/matita/contribs/lambda_delta/basic_2/unfold/ldrops_ldrop.ma b/matita/matita/contribs/lambda_delta/basic_2/unfold/ldrops_ldrop.ma
deleted file mode 100644
index 6ca2f73df..000000000
--- a/matita/matita/contribs/lambda_delta/basic_2/unfold/ldrops_ldrop.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/substitution/ldrop_ldrop.ma".
-include "basic_2/unfold/ldrops.ma".
-
-(* GENERIC LOCAL ENVIRONMENT SLICING ****************************************)
-
-(* Properties concerning basic local environment slicing ********************)
-
-lemma ldrops_ldrop_trans: ∀L1,L,des. ⇩*[des] L1 ≡ L → ∀L2,i. ⇩[0, i] L ≡ L2 →
-                          ∃∃L0,des0,i0. ⇩[0, i0] L1 ≡ L0 & ⇩*[des0] L0 ≡ L2 &
-                                        @⦃i, des⦄ ≡ i0 & des ▭ i ≡ des0.
-#L1 #L #des #H elim H -L1 -L -des
-[ /2 width=7/
-| #L1 #L3 #L #des3 #d #e #_ #HL3 #IHL13 #L2 #i #HL2
-  elim (lt_or_ge i d) #Hid
-  [ elim (ldrop_trans_le … HL3 … HL2 ?) -L /2 width=2/ #L #HL3 #HL2
-    elim (IHL13 … HL3) -L3 /3 width=7/
-  | lapply (ldrop_trans_ge … HL3 … HL2 ?) -L // #HL32
-    elim (IHL13 … HL32) -L3 /3 width=7/
-  ]
-]
-qed-.