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diff --git a/matita/matita/contribs/lambdadelta/static_2/relocation/drops_ctc.ma b/matita/matita/contribs/lambdadelta/static_2/relocation/drops_ctc.ma
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@@ -0,0 +1,72 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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 "ground_2/lib/star.ma".
+include "static_2/relocation/seq_seq.ma".
+
+(* GENERIC SLICING FOR LOCAL ENVIRONMENTS ***********************************)
+
+(* Properties with contextual transitive closure ****************************)
+
+(* Basic_2A1: was: d_liftable_LTC *)
+lemma d2_liftable_sn_CTC: ∀C,S,R. d_liftable2_sn C S R → d_liftable2_sn C S (CTC … R).
+#C #S #R #HR #K #T1 #T2 #H elim H -T2
+[ #T2 #HT12 #b #f #L #HLK #U1 #HTU1
+  elim (HR … HT12 … HLK … HTU1) /3 width=3 by inj, ex2_intro/
+| #T #T2 #_ #HT2 #IHT1 #b #f #L #HLK #U1 #HTU1
+  elim (IHT1 … HLK … HTU1) -T1 #U #HTU #HU1
+  elim (HR … HT2 … HLK … HTU) -HR -K -T /3 width=5 by step, ex2_intro/
+]
+qed-.
+
+(* Basic_2A1: was: d_deliftable_sn_LTC *)
+lemma d2_deliftable_sn_CTC: ∀C,S,R. d_deliftable2_sn C S R → d_deliftable2_sn C S (CTC … R).
+#C #S #R #HR #L #U1 #U2 #H elim H -U2
+[ #U2 #HU12 #b #f #K #HLK #T1 #HTU1
+  elim (HR … HU12 … HLK … HTU1) -HR -L -U1 /3 width=3 by inj, ex2_intro/
+| #U #U2 #_ #HU2 #IHU1 #b #f #K #HLK #T1 #HTU1
+  elim (IHU1 … HLK … HTU1) -IHU1 -U1 #T #HTU #HT1
+  elim (HR … HU2 … HLK … HTU) -HR -L -U /3 width=5 by step, ex2_intro/
+]
+qed-.
+
+lemma co_dropable_sn_CTC: ∀R. co_dropable_sn R → co_dropable_sn (CTC … R).
+#R #HR #b #f #L1 #K1 #HLK1 #Hf #f2 #L2 #H elim H -L2
+[ #L2 #HL12 #f1 #H elim (HR … HLK1 … Hf … HL12 … H) -HR -Hf -f2 -L1
+  /3 width=3 by inj, ex2_intro/
+| #L #L2 #_ #HL2 #IH #f1 #H elim (IH … H) -IH
+  #K #HK1 #HLK elim (HR … HLK … HL2 … H) -HR -f2 -L
+  /3 width=3 by step, ex2_intro/
+]
+qed-.
+
+lemma co_dropable_dx_CTC: ∀R. co_dropable_dx R → co_dropable_dx (CTC … R).
+#R #HR #f2 #L1 #L2 #H elim H -L2
+[ #L2 #HL12 #b #f #K2 #HLK2 #Hf #f1 #Hf2 elim (HR … HL12 … HLK2 … Hf … Hf2) -HR -Hf -f2 -L2
+  /3 width=3 by inj, ex2_intro/
+| #L #L2 #_ #HL2 #IHL1 #b #f #K2 #HLK2 #Hf #f1 #Hf2 elim (HR … HL2 … HLK2 … Hf … Hf2) -HR -L2
+  #K #HLK #HK2 elim (IHL1 … HLK … Hf … Hf2) -Hf -f2 -L
+  /3 width=5 by step, ex2_intro/
+]
+qed-.
+
+lemma co_dedropable_sn_CTC: ∀R. co_dedropable_sn R → co_dedropable_sn (CTC … R).
+#R #HR #b #f #L1 #K1 #HLK1 #f1 #K2 #H elim H -K2
+[ #K2 #HK12 #f2 #Hf elim (HR … HLK1 … HK12 … Hf) -HR -f1 -K1
+  /3 width=4 by inj, ex3_intro/
+| #K #K2 #_ #HK2 #IH #f2 #Hf elim (IH … Hf) -IH -K1
+  #L #H1L1 #HLK #H2L1 elim (HR … HLK … HK2 … Hf) -HR -f1 -K
+  /3 width=6 by seq_trans, step, ex3_intro/
+]
+qed-.