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diff --git a/matita/matita/contribs/lambda_delta/basic_2/hod/ntas.ma b/matita/matita/contribs/lambda_delta/basic_2/hod/ntas.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 "basic_2/dynamic/nta.ma".
-
-(* HIGHER ORDER NATIVE TYPE ASSIGNMENT ON TERMS *****************************)
-
-definition ntas: sh → lenv → relation term ≝
-                 λh,L. star … (nta h L).
-
-interpretation "higher order native type assignment (term)"
-   'NativeTypeStar h L T U = (ntas h L T U).
-
-(* Basic eliminators ********************************************************)
-(*
-lemma cprs_ind: ∀L,T1. ∀R:predicate term. R T1 →
-                (∀T,T2. L ⊢ T1 ➡* T → L ⊢ T ➡ T2 → R T → R T2) →
-                ∀T2. L ⊢ T1 ➡* T2 → R T2.
-#L #T1 #R #HT1 #IHT1 #T2 #HT12
-@(TC_star_ind … HT1 IHT1 … HT12) //
-qed-.
-*)
-axiom ntas_ind_dx: ∀h,L,T2. ∀R:predicate term. R T2 →
-                   (∀T1,T. ⦃h, L⦄ ⊢ T1 : T → ⦃h, L⦄ ⊢ T :* T2 → R T → R T1) →
-                   ∀T1. ⦃h, L⦄ ⊢ T1 :* T2 → R T1.
-(*
-#h #L #T2 #R #HT2 #IHT2 #T1 #HT12
-@(star_ind_dx … HT2 IHT2 … HT12) //
-qed-.
-*)
-(* Basic properties *********************************************************)
-
-lemma ntas_refl: ∀h,L,T. ⦃h, L⦄ ⊢ T :* T.
-// qed.
-
-lemma ntas_strap1: ∀h,L,T1,T,T2.
-                   ⦃h, L⦄ ⊢ T1 :* T → ⦃h, L⦄  ⊢ T : T2 → ⦃h, L⦄  ⊢ T1 :* T2.
-/2 width=3/ qed.
-
-lemma ntas_strap2: ∀h,L,T1,T,T2.
-                   ⦃h, L⦄  ⊢ T1 : T → ⦃h, L⦄ ⊢ T :* T2 → ⦃h, L⦄ ⊢ T1 :* T2.
-/2 width=3/ qed.