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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_rmap_after.ma b/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_rmap_after.ma
deleted file mode 100644
index 7fda762da..000000000
--- a/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_rmap_after.ma
+++ /dev/null
@@ -1,36 +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/unwind2_rmap.ma".
-include "delayed_updating/syntax/path_structure.ma".
-include "ground/relocation/tr_compose_compose.ma".
-include "ground/relocation/tr_compose_pn.ma".
-include "ground/relocation/tr_compose_eq.ma".
-include "ground/relocation/tr_pn_eq.ma".
-include "ground/lib/stream_eq_eq.ma".
-
-(* TAILED UNWIND FOR RELOCATION MAP *****************************************)
-
-(* Constructions with tr_after **********************************************)
-
-lemma unwind2_rmap_after (g) (f) (p:path):
-      ▶[g]⊗p∘▶[f]p ≗ ▶[g∘f]p.
-#g #f #p elim p -p // * [ #k ] #p #IH //
-[ <structure_d_dx <unwind2_rmap_d_dx <unwind2_rmap_d_dx
-  @(stream_eq_canc_sn … (tr_compose_assoc …))
-  /2 width=1 by tr_compose_eq_repl/
-| <structure_L_dx <unwind2_rmap_L_dx <unwind2_rmap_L_dx <unwind2_rmap_L_dx
-  /2 width=1 by tr_push_eq_repl/
-]
-qed.