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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_sdj_isi.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_sdj_isi.ma
deleted file mode 100644
index fac14a47a..000000000
--- a/matita/matita/contribs/lambdadelta/ground/relocation/gr_sdj_isi.ma
+++ /dev/null
@@ -1,47 +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 "ground/relocation/gr_isi.ma".
-include "ground/relocation/gr_sdj.ma".
-
-(* DISJOINTNESS FOR GENERIC RELOCATION MAPS *********************************)
-
-(* Constructions with gr_isi ************************************************)
-
-(*** sdj_isid_dx *)
-corec lemma gr_sdj_isi_dx:
-            ∀f2. 𝐈❪f2❫ → ∀f1. f1 ∥ f2.
-#f2 * -f2
-#f2 #g2 #Hf2 #H2 #f1 cases (gr_map_split_tl f1) *
-/3 width=5 by gr_sdj_next_push, gr_sdj_push_bi/
-qed.
-
-(*** sdj_isid_sn *)
-corec lemma gr_sdj_isi_sn:
-            ∀f1. 𝐈❪f1❫ → ∀f2. f1 ∥ f2.
-#f1 * -f1
-#f1 #g1 #Hf1 #H1 #f2 cases (gr_map_split_tl f2) *
-/3 width=5 by gr_sdj_push_next, gr_sdj_push_bi/
-qed.
-
-(* Inversions with gr_isi ***************************************************)
-
-(*** sdj_inv_refl *)
-corec lemma gr_sdj_inv_refl:
-            ∀f. f ∥ f →  𝐈❪f❫.
-#f cases (gr_map_split_tl f) #Hf #H
-[ lapply (gr_sdj_inv_push_bi … H … Hf Hf) -H /3 width=3 by gr_isi_push/
-| elim (gr_sdj_inv_next_bi … H … Hf Hf)
-]
-qed-.