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diff --git a/matita/matita/contribs/lambdadelta/static_2/syntax/theq_simple_vector.ma b/matita/matita/contribs/lambdadelta/static_2/syntax/theq_simple_vector.ma
deleted file mode 100644
index f7212ee11..000000000
--- a/matita/matita/contribs/lambdadelta/static_2/syntax/theq_simple_vector.ma
+++ /dev/null
@@ -1,31 +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 "static_2/syntax/term_vector.ma".
-include "static_2/syntax/theq_simple.ma".
-
-(* HEAD EQUIVALENCE FOR TERMS ***********************************************)
-
-(* Advanced inversion lemmas with simple (neutral) terms ********************)
-
-(* Basic_1: was only: iso_flats_lref_bind_false iso_flats_flat_bind_false *)
-(* Basic_2A1: was: tsts_inv_bind_applv_simple *)
-lemma theq_inv_applv_bind_simple: ∀h,o,p,I,Vs,V2,T1,T2. ⒶVs.T1 ⩳[h, o] ⓑ{p,I}V2.T2 →
-                                  𝐒⦃T1⦄ → ⊥.
-#h #o #p #I #Vs #V2 #T1 #T2 #H elim (theq_inv_pair2 … H) -H
-#V0 #T0 elim Vs -Vs normalize
-[ #H destruct #H /2 width=5 by simple_inv_bind/
-| #V #Vs #_ #H destruct
-]
-qed-.