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diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/lsubr_drops.ma b/matita/matita/contribs/lambdadelta/basic_2/static/lsubr_drops.ma
deleted file mode 100644
index f69618336..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/static/lsubr_drops.ma
+++ /dev/null
@@ -1,52 +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 "basic_2/relocation/drops.ma".
-include "basic_2/static/lsubr.ma".
-
-(* RESTRICTED REFINEMENT FOR LOCAL ENVIRONMENTS *****************************)
-
-(* Forward lemmas with generic slicing for local environments ***************)
-
-(* Basic_2A1: includes: lsubr_fwd_drop2_pair *)
-lemma lsubr_fwd_drops2_bind: ∀L1,L2. L1 ⫃ L2 → 
-                             ∀b,f,I,K2. 𝐔⦃f⦄ → ⬇*[b, f] L2 ≘ K2.ⓘ{I} →
-                             ∨∨ ∃∃K1. K1 ⫃ K2 & ⬇*[b, f] L1 ≘ K1.ⓘ{I}
-                              | ∃∃K1,W,V. K1 ⫃ K2 & ⬇*[b, f] L1 ≘ K1.ⓓⓝW.V & I = BPair Abst W
-                              | ∃∃J1,J2,K1,V. K1 ⫃ K2 & ⬇*[b, f] L1 ≘ K1.ⓑ{J1}V & I = BUnit J2.
-#L1 #L2 #H elim H -L1 -L2
-[ #b #f #I #K2 #_ #H
-  elim (drops_inv_atom1 … H) -H #H destruct
-| #J #L1 #L2 | #L1 #L2 #V #W | #I1 #I2 #L1 #L2 #V1
-]
-#HL12 #IH #b #f #I #K2 #Hf #H
-elim (drops_inv_bind1_isuni … Hf H) -Hf -H *
-[1,3,5: #Hf #H destruct -IH
-  /4 width=6 by drops_refl, or3_intro0, or3_intro1, or3_intro2, ex3_4_intro, ex3_3_intro, ex2_intro/
-|2,4,6: #g #Hg #HLK2 #H destruct -HL12
-  elim (IH … Hg HLK2) -IH -Hg -HLK2 *
-  /4 width=6 by drops_drop, or3_intro0, or3_intro1, or3_intro2, ex3_4_intro, ex3_3_intro, ex2_intro/
-]
-qed-.
-
-(* Basic_2A1: includes: lsubr_fwd_drop2_abbr *)
-lemma lsubr_fwd_drops2_abbr: ∀L1,L2. L1 ⫃ L2 →
-                             ∀b,f,K2,V.  𝐔⦃f⦄ → ⬇*[b, f] L2 ≘ K2.ⓓV →
-                             ∃∃K1. K1 ⫃ K2 & ⬇*[b, f] L1 ≘ K1.ⓓV.
-#L1 #L2 #HL12 #b #f #K2 #V #Hf #HLK2
-elim (lsubr_fwd_drops2_bind … HL12 … Hf HLK2) -L2 -Hf // *
-[ #K1 #W #V #_ #_ #H destruct
-| #I1 #I2 #K1 #V #_ #_ #H destruct
-]
-qed-.