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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/unwind/preunwind2_rmap_eq.ma b/matita/matita/contribs/lambdadelta/delayed_updating/unwind/preunwind2_rmap_eq.ma
deleted file mode 100644
index 32efd9f04..000000000
--- a/matita/matita/contribs/lambdadelta/delayed_updating/unwind/preunwind2_rmap_eq.ma
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@@ -1,27 +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 "delayed_updating/unwind/preunwind2_rmap.ma".
-include "ground/relocation/tr_compose_eq.ma".
-include "ground/relocation/tr_pn_eq.ma".
-
-(* TAILED PREUNWIND FOR RELOCATION MAP **************************************)
-
-(* Constructions with tr_map_eq *********************************************)
-
-lemma preunwind2_rmap_eq_repl (l):
-      stream_eq_repl … (λf1,f2. ▶[f1]l ≗ ▶[f2]l).
-* // #k #f1 #f2 #Hf
-/2 width=1 by tr_compose_eq_repl/
-qed-.