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diff --git a/matita/matita/contribs/lambdadelta/static_2/syntax/ceq_ext_ceq_ext.ma b/matita/matita/contribs/lambdadelta/static_2/syntax/ceq_ext_ceq_ext.ma
deleted file mode 100644
index be057f98c..000000000
--- a/matita/matita/contribs/lambdadelta/static_2/syntax/ceq_ext_ceq_ext.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 "static_2/syntax/ceq_ext.ma".
-
-(* CONTEXT-AWARE SYNTACTIC EQUIVALENCE FOR BINDERS **************************)
-
-(* Main properties **********************************************************)
-
-theorem ceq_ext_trans: ∀L1,I1,I. ceq_ext L1 I1 I →
-                       ∀L2,I2. ceq_ext L2 I I2 → ∀L3. ceq_ext L3 I1 I2.
-#L1 #I1 #I * -I1 -I //
-#I1 #V1 #V #HV1 #L2 #Z #H elim (ext2_inv_pair_sn … H) -H //
-qed-.