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diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/nv_fqus.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/nv_fqus.ma
deleted file mode 100644
index af3fba488..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/nv_fqus.ma
+++ /dev/null
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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 "basic_2/s_computation/fqus_fqup.ma".
-include "basic_2/dynamic/nv_drops.ma".
-
-(* NATIVE VALIDITY FOR TERMS ************************************************)
-
-(* Properties with supclosure ***********************************************)
-
-(* Basic_2A1: uses: snv_fqu_conf *)
-lemma nv_fqu_conf (a) (h): ∀G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐ ⦃G2, L2, T2⦄ →
-                           ⦃G1, L1⦄ ⊢ T1 ![a, h] → ⦃G2, L2⦄ ⊢ T2 ![a, h].
-#a #h #G1 #G2 #L1 #L2 #T1 #T2 #H elim H -G1 -G2 -L1 -L2 -T1 -T2
-[ #I1 #G1 #L1 #V1 #H
-  elim (nv_inv_zero … H) -H #I2 #L2 #V2 #HV2 #H destruct //
-| * [ #p #I1 | * ] #G1 #L1 #V1 #T1 #H
-  [ elim (nv_inv_bind … H) -H //
-  | elim (nv_inv_appl … H) -H //
-  | elim (nv_inv_cast … H) -H //
-  ]
-| #p #I1 #G1 #L1 #V1 #T1 #H
-  elim (nv_inv_bind … H) -H //
-| #p #I1 #G1 #L1 #V1 #T1 #H destruct
-| * #G1 #L1 #V1 #T1 #H
-  [ elim (nv_inv_appl … H) -H //
-  | elim (nv_inv_cast … H) -H //
-  ]
-| #I1 #G1 #L1 #T1 #U1 #HTU1 #HU 
-  /4 width=7 by nv_inv_lifts, drops_refl, drops_drop/
-]
-qed-.
-
-(* Basic_2A1: uses: snv_fquq_conf *)
-lemma nv_fquq_conf (a) (h): ∀G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐⸮ ⦃G2, L2, T2⦄ →
-                            ⦃G1, L1⦄ ⊢ T1 ![a, h] → ⦃G2, L2⦄ ⊢ T2 ![a, h].
-#a #h #G1 #G2 #L1 #L2 #T1 #T2 #H elim H -H [|*]
-/2 width=5 by nv_fqu_conf/
-qed-.
-
-(* Basic_2A1: uses: snv_fqup_conf *)
-lemma nv_fqup_conf (a) (h): ∀G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐+ ⦃G2, L2, T2⦄ →
-                            ⦃G1, L1⦄ ⊢ T1 ![a, h] → ⦃G2, L2⦄ ⊢ T2 ![a, h].
-#a #h #G1 #G2 #L1 #L2 #T1 #T2 #H @(fqup_ind … H) -G2 -L2 -T2
-/3 width=5 by fqup_strap1, nv_fqu_conf/
-qed-.
-
-(* Basic_2A1: uses: snv_fqus_conf *)
-lemma nv_fqus_conf (a) (h): ∀G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐* ⦃G2, L2, T2⦄ →
-                            ⦃G1, L1⦄ ⊢ T1 ![a, h] → ⦃G2, L2⦄ ⊢ T2 ![a, h].
-#a #h #G1 #G2 #L1 #L2 #T1 #T2 #H elim (fqus_inv_fqup … H) -H [|*]
-/2 width=5 by nv_fqup_conf/
-qed-.