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diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/snv_lsstas.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/snv_lsstas.ma
deleted file mode 100644
index a0ef9e99e..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/snv_lsstas.ma
+++ /dev/null
@@ -1,63 +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/dynamic/snv_lift.ma".
-include "basic_2/dynamic/snv_cpcs.ma".
-
-(* STRATIFIED NATIVE VALIDITY FOR TERMS *************************************)
-
-(* Properties on nat-iterated stratified static type assignment for terms ***)
-
-fact snv_lsstas_aux: ∀h,g,G0,L0,T0.
-                     (∀G1,L1,T1. ⦃G0, L0, T0⦄ >≡[h, g] ⦃G1, L1, T1⦄ → IH_snv_cpr_lpr h g G1 L1 T1) →
-                     (∀G1,L1,T1. ⦃G0, L0, T0⦄ >≡[h, g] ⦃G1, L1, T1⦄ → IH_da_cpr_lpr h g G1 L1 T1) →
-                     (∀G1,L1,T1. ⦃G0, L0, T0⦄ >≡[h, g] ⦃G1, L1, T1⦄ → IH_lsstas_cpr_lpr h g G1 L1 T1) →
-                     (∀G1,L1,T1. ⦃G0, L0, T0⦄ >≡[h, g] ⦃G1, L1, T1⦄ → IH_snv_lsstas h g G1 L1 T1) →
-                     ∀G1,L1,T1. G0 = G1 → L0 = L1 → T0 = T1 → IH_snv_lsstas h g G1 L1 T1.
-#h #g #G0 #L0 #T0 #IH4 #IH3 #IH2 #IH1 #G1 #L1 * * [|||| * ]
-[ #k #HG0 #HL0 #HT0 #_ #l1 #l2 #Hl21 #Hl1 #X #H2 destruct -IH4 -IH3 -IH2 -IH1
-  >(lsstas_inv_sort1 … H2) -X //
-| #i #HG0 #HL0 #HT0 #H1 #l1 #l2 @(nat_ind_plus … l2) -l2 [ #_ | #l2 #_ #Hl21 ] #Hl1 #X #H2 destruct -IH4 -IH3 -IH2
-  [ lapply (lsstas_inv_O … H2) -H2 #H destruct // ]
-  elim (snv_inv_lref … H1) -H1 #I0 #K0 #X0 #HLK0 #HX0
-  elim (da_inv_lref … Hl1) -Hl1 * #K1 [ #V1 | #W1 #l ] #HLK1 [ #Hl1 | #Hl #H ]
-  lapply (ldrop_mono … HLK0 … HLK1) -HLK0 #H0 destruct
-  elim (lsstas_inv_lref1 … H2) -H2 * #K0 #Y0 #X0 [2,4: #l0 ] #HLK0 [1,2: #HYl0 ] #HYX0 #HX0
-  lapply (ldrop_mono … HLK0 … HLK1) -HLK0 #H destruct
-  [ lapply (le_plus_to_le_r … Hl21) -Hl21 #Hl21 ]
-  lapply (fqup_lref … G1 … HLK1) #H
-  lapply (ldrop_fwd_drop2 … HLK1) -HLK1 /4 width=8 by fqup_fpbg, snv_lift/
-| #p #HG0 #HL0 #HT0 #H1 #l1 #l2 #Hl21 #Hl1 #X #H2 destruct -IH4 -IH3 -IH2 -IH1
-  elim (snv_inv_gref … H1)
-| #a #I #V1 #T1 #HG0 #HL0 #HT0 #H1 #l1 #l2 #Hl21 #Hl1 #X #H2 destruct -IH4 -IH3 -IH2
-  elim (snv_inv_bind … H1) -H1 #HV1 #HT1
-  lapply (da_inv_bind … Hl1) -Hl1 #Hl1
-  elim (lsstas_inv_bind1 … H2) -H2 #U1 #HTU1 #H destruct /4 width=8 by fqup_fpbg, snv_bind/
-| #V1 #T1 #HG0 #HL0 #HT0 #H1 #l1 #l2 #Hl21 #Hl1 #X #H2 destruct
-  elim (snv_inv_appl … H1) -H1 #a #W1 #W0 #T0 #l0 #HV1 #HT1 #Hl0 #HVW1 #HW10 #HT10
-  lapply (da_inv_flat … Hl1) -Hl1 #Hl1
-  elim (lsstas_inv_appl1 … H2) -H2 #U1 #HTU1 #H destruct
-  lapply (IH1 … HT1 … Hl1 … HTU1) /2 width=1 by fqup_fpbg/ #HU1
-  elim (lsstas_cpds_aux … IH1 IH4 IH3 IH2 … Hl1 … HTU1 … HT10) -IH4 -IH3 -IH2 -IH1 /2 width=1 by fqup_fpbg/ -T1 -l1 #X #l #_ #H #HU10 -l2
-  elim (lsstas_inv_bind1 … H) -H #U0 #_ #H destruct -T0 -l
-  elim (cpes_inv_abst2 … HU10) -HU10 #W2 #U2 #HU12 #HU02
-  elim (cprs_inv_abst … HU02) -HU02 #HW02 #_
-  /3 width=7 by snv_appl, cprs_trans/
-| #W1 #T1 #HG0 #HL0 #HT0 #H1 #l1 #l2 @(nat_ind_plus … l2) -l2 [ #_ | #l2 #_ #Hl21 ] #Hl1 #X #H2 destruct -IH4 -IH3 -IH2
-  [ lapply (lsstas_inv_O … H2) -H2 #H destruct // ]
-  elim (snv_inv_cast … H1) -H1
-  lapply (da_inv_flat … Hl1) -Hl1
-  lapply (lsstas_inv_cast1 … H2) -H2 /3 width=8 by fqup_fpbg/
-]
-qed-.