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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma
deleted file mode 100644
index 2a6553d9d..000000000
--- a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma
+++ /dev/null
@@ -1,34 +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/substitution/fsubst.ma".
-include "delayed_updating/substitution/lift_prototerm.ma".
-include "delayed_updating/syntax/prototerm_eq.ma".
-include "delayed_updating/syntax/path_closed.ma".
-include "delayed_updating/notation/relations/black_rightarrow_if_3.ma".
-include "ground/relocation/tr_uni.ma".
-include "ground/xoa/ex_4_3.ma".
-
-(* IMMEDIATE FOCUSED REDUCTION ************************************************)
-
-definition ifr (r): relation2 prototerm prototerm ≝
-           λt1,t2.
-           ∃∃p,q,n. p●𝗔◗𝗟◗q = r &
-           q ϵ 𝐂❨Ⓕ,n❩ & r◖𝗱↑n ϵ t1 &
-           t1[⋔r←🠡[𝐮❨↑n❩](t1⋔(p◖𝗦))] ⇔ t2
-.
-
-interpretation
-  "focused reduction with immediate updating (prototerm)"
-  'BlackRightArrowIF t1 r t2 = (ifr r t1 t2).