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diff --git a/matita/matita/contribs/lambdadelta/basic_2/relocation/sex_tc.ma b/matita/matita/contribs/lambdadelta/basic_2/relocation/sex_tc.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 "ground_2/lib/star.ma".
+include "basic_2/relocation/sex.ma".
+
+(* GENERIC ENTRYWISE EXTENSION OF CONTEXT-SENSITIVE REALTIONS FOR TERMS *****)
+
+definition s_rs_transitive_isid: relation (relation3 lenv bind bind) ≝ λRN,RP.
+                                 ∀f. 𝐈⦃f⦄ → s_rs_transitive … RP (λ_.sex RN RP f).
+
+(* Properties with transitive closure ***************************************)
+
+lemma sex_tc_refl: ∀RN,RP. c_reflexive … RN → c_reflexive … RP →
+                   ∀f. reflexive … (TC … (sex RN RP f)).
+/3 width=1 by sex_refl, TC_reflexive/ qed.
+
+lemma sex_tc_next_sn: ∀RN,RP. c_reflexive … RN →
+                      ∀f,I2,L1,L2. TC … (sex RN RP f) L1 L2 → ∀I1. RN L1 I1 I2 → 
+                      TC … (sex RN RP (↑f)) (L1.ⓘ{I1}) (L2.ⓘ{I2}).
+#RN #RP #HRN #f #I2 #L1 #L2 #H @(TC_ind_dx ??????? H) -L1
+/3 width=3 by sex_next, TC_strap, inj/
+qed.
+
+lemma sex_tc_next_dx: ∀RN,RP. c_reflexive … RN → c_reflexive … RP →
+                      ∀f,I1,I2,L1. (CTC … RN) L1 I1 I2 → ∀L2. L1 ⪤[RN, RP, f] L2 →
+                      TC … (sex RN RP (↑f)) (L1.ⓘ{I1}) (L2.ⓘ{I2}).
+#RN #RP #HRN #HRP #f #I1 #I2 #L1 #H elim H -I2
+/4 width=5 by sex_refl, sex_next, step, inj/
+qed.
+
+lemma sex_tc_push_sn: ∀RN,RP. c_reflexive … RP →
+                      ∀f,I2,L1,L2. TC … (sex RN RP f) L1 L2 → ∀I1. RP L1 I1 I2 → 
+                      TC … (sex RN RP (⫯f)) (L1.ⓘ{I1}) (L2.ⓘ{I2}).
+#RN #RP #HRP #f #I2 #L1 #L2 #H @(TC_ind_dx ??????? H) -L1
+/3 width=3 by sex_push, TC_strap, inj/
+qed.
+
+lemma sex_tc_push_dx: ∀RN,RP. c_reflexive … RN → c_reflexive … RP →
+                      ∀f,I1,I2,L1. (CTC … RP) L1 I1 I2 → ∀L2. L1 ⪤[RN, RP, f] L2 →
+                      TC … (sex RN RP (⫯f)) (L1.ⓘ{I1}) (L2.ⓘ{I2}).
+#RN #RP #HRN #HRP #f #I1 #I2 #L1 #H elim H -I2
+/4 width=5 by sex_refl, sex_push, step, inj/
+qed.
+
+lemma sex_tc_inj_sn: ∀RN,RP,f,L1,L2. L1 ⪤[RN, RP, f] L2 → L1 ⪤[CTC … RN, RP, f] L2.
+#RN #RP #f #L1 #L2 #H elim H -f -L1 -L2
+/3 width=1 by sex_push, sex_next, inj/
+qed.
+
+lemma sex_tc_inj_dx: ∀RN,RP,f,L1,L2. L1 ⪤[RN, RP, f] L2 → L1 ⪤[RN, CTC … RP, f] L2.
+#RN #RP #f #L1 #L2 #H elim H -f -L1 -L2
+/3 width=1 by sex_push, sex_next, inj/
+qed.
+
+(* Main properties with transitive closure **********************************)
+
+theorem sex_tc_next: ∀RN,RP. c_reflexive … RN → c_reflexive … RP →
+                     ∀f,I1,I2,L1. (CTC … RN) L1 I1 I2 → ∀L2. TC … (sex RN RP f) L1 L2 →
+                     TC … (sex RN RP (↑f)) (L1.ⓘ{I1}) (L2.ⓘ{I2}).
+#RN #RP #HRN #HRP #f #I1 #I2 #L1 #H elim H -I2
+/4 width=5 by sex_tc_next_sn, sex_tc_refl, trans_TC/
+qed.
+
+theorem sex_tc_push: ∀RN,RP. c_reflexive … RN → c_reflexive … RP →
+                     ∀f,I1,I2,L1. (CTC … RP) L1 I1 I2 → ∀L2. TC … (sex RN RP f) L1 L2 →
+                     TC … (sex RN RP (⫯f)) (L1.ⓘ{I1}) (L2.ⓘ{I2}).
+#RN #RP #HRN #HRP #f #I1 #I2 #L1 #H elim H -I2
+/4 width=5 by sex_tc_push_sn, sex_tc_refl, trans_TC/
+qed.
+
+(* Basic_2A1: uses: TC_lpx_sn_ind *)
+theorem sex_tc_step_dx: ∀RN,RP. s_rs_transitive_isid RN RP →
+                        ∀f,L1,L. L1 ⪤[RN, RP, f] L → 𝐈⦃f⦄ →
+                        ∀L2. L ⪤[RN, CTC … RP, f] L2 → L1⪤ [RN, CTC … RP, f] L2.
+#RN #RP #HRP #f #L1 #L #H elim H -f -L1 -L
+[ #f #_ #Y #H -HRP >(sex_inv_atom1 … H) -Y // ]
+#f #I1 #I #L1 #L #HL1 #HI1 #IH #Hf #Y #H
+[ elim (isid_inv_next … Hf) -Hf //
+| lapply (isid_inv_push … Hf ??) -Hf [3: |*: // ] #Hf
+  elim (sex_inv_push1 … H) -H #I2 #L2 #HL2 #HI2 #H destruct
+  @sex_push [ /2 width=1 by/ ] -L2 -IH
+  @(TC_strap … HI1) -HI1
+  @(HRP … HL1) // (**) (* auto fails *)
+]
+qed-.
+
+(* Advanced properties ******************************************************)
+
+lemma sex_tc_dx: ∀RN,RP. s_rs_transitive_isid RN RP →
+                 ∀f. 𝐈⦃f⦄ → ∀L1,L2. TC … (sex RN RP f) L1 L2 → L1 ⪤[RN, CTC … RP, f] L2.
+#RN #RP #HRP #f #Hf #L1 #L2 #H @(TC_ind_dx ??????? H) -L1
+/3 width=3 by sex_tc_step_dx, sex_tc_inj_dx/
+qed.
+
+(* Advanced inversion lemmas ************************************************)
+
+lemma sex_inv_tc_sn: ∀RN,RP. c_reflexive … RN → c_reflexive … RP →
+                     ∀f,L1,L2. L1 ⪤[CTC … RN, RP, f] L2 → TC … (sex RN RP f) L1 L2.
+#RN #RP #HRN #HRP #f #L1 #L2 #H elim H -f -L1 -L2
+/2 width=1 by sex_tc_next, sex_tc_push_sn, sex_atom, inj/
+qed-.
+
+lemma sex_inv_tc_dx: ∀RN,RP. c_reflexive … RN → c_reflexive … RP →
+                     ∀f,L1,L2. L1 ⪤[RN, CTC … RP, f] L2 → TC … (sex RN RP f) L1 L2.
+#RN #RP #HRN #HRP #f #L1 #L2 #H elim H -f -L1 -L2
+/2 width=1 by sex_tc_push, sex_tc_next_sn, sex_atom, inj/
+qed-.