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diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/lsubr.ma b/matita/matita/contribs/lambdadelta/basic_2/static/lsubr.ma
index 111da1751..5845bcb63 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/static/lsubr.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/static/lsubr.ma
@@ -13,9 +13,9 @@
 (**************************************************************************)
 
 include "basic_2/notation/relations/lrsubeqc_2.ma".
-include "basic_2/substitution/drop.ma".
+include "basic_2/grammar/lenv.ma".
 
-(* RESTRICTED LOCAL ENVIRONMENT REFINEMENT **********************************)
+(* RESTRICTED REFINEMENT FOR LOCAL ENVIRONMENTS *****************************)
 
 inductive lsubr: relation lenv ≝
 | lsubr_atom: ∀L. lsubr L (⋆)
@@ -70,38 +70,3 @@ qed-.
 lemma lsubr_inv_abbr2: ∀L1,K2,W. L1 ⫃ K2.ⓓW →
                        ∃∃K1. K1 ⫃ K2 & L1 = K1.ⓓW.
 /2 width=3 by lsubr_inv_abbr2_aux/ qed-.
-
-(* Basic forward lemmas *****************************************************)
-
-lemma lsubr_fwd_length: ∀L1,L2. L1 ⫃ L2 → |L2| ≤ |L1|.
-#L1 #L2 #H elim H -L1 -L2 /2 width=1 by monotonic_le_plus_l/
-qed-.
-
-lemma lsubr_fwd_drop2_pair: ∀L1,L2. L1 ⫃ L2 →
-                            ∀I,K2,W,s,i. ⬇[s, 0, i] L2 ≡ K2.ⓑ{I}W →
-                            (∃∃K1. K1 ⫃ K2 & ⬇[s, 0, i] L1 ≡ K1.ⓑ{I}W) ∨
-                            ∃∃K1,V. K1 ⫃ K2 & ⬇[s, 0, i] L1 ≡ K1.ⓓⓝW.V & I = Abst.
-#L1 #L2 #H elim H -L1 -L2
-[ #L #I #K2 #W #s #i #H
-  elim (drop_inv_atom1 … H) -H #H destruct
-| #J #L1 #L2 #V #HL12 #IHL12 #I #K2 #W #s #i #H
-  elim (drop_inv_O1_pair1 … H) -H * #Hi #HLK2 destruct [ -IHL12 | -HL12 ]
-  [ /3 width=3 by drop_pair, ex2_intro, or_introl/
-  | elim (IHL12 … HLK2) -IHL12 -HLK2 *
-    /4 width=4 by drop_drop_lt, ex3_2_intro, ex2_intro, or_introl, or_intror/
-  ]
-| #L1 #L2 #V1 #V2 #HL12 #IHL12 #I #K2 #W #s #i #H
-  elim (drop_inv_O1_pair1 … H) -H * #Hi #HLK2 destruct [ -IHL12 | -HL12 ]
-  [ /3 width=4 by drop_pair, ex3_2_intro, or_intror/
-  | elim (IHL12 … HLK2) -IHL12 -HLK2 *
-    /4 width=4 by drop_drop_lt, ex3_2_intro, ex2_intro, or_introl, or_intror/
-  ]
-]
-qed-.
-
-lemma lsubr_fwd_drop2_abbr: ∀L1,L2. L1 ⫃ L2 →
-                            ∀K2,V,s,i. ⬇[s, 0, i] L2 ≡ K2.ⓓV →
-                            ∃∃K1. K1 ⫃ K2 & ⬇[s, 0, i] L1 ≡ K1.ⓓV.
-#L1 #L2 #HL12 #K2 #V #s #i #HLK2 elim (lsubr_fwd_drop2_pair … HL12 … HLK2) -L2 // *
-#K1 #W #_ #_ #H destruct
-qed-.