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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_ist_ist.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_ist_ist.ma
deleted file mode 100644
index cfa6aaa91..000000000
--- a/matita/matita/contribs/lambdadelta/ground/relocation/gr_ist_ist.ma
+++ /dev/null
@@ -1,68 +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_eq.ma".
-include "ground/relocation/gr_pat_lt.ma".
-include "ground/relocation/gr_pat_pat.ma".
-include "ground/relocation/gr_ist.ma".
-
-(* TOTALITY CONDITION FOR GENERIC RELOCATION MAPS ***************************)
-
-(* Advanced constructions with gr_pat ***************************************)
-
-(*** at_dec *)
-lemma gr_pat_dec (f) (i1) (i2): 𝐓❪f❫ → Decidable (@❪i1,f❫ ≘ i2).
-#f #i1 #i2 #Hf lapply (Hf i1) -Hf *
-#j2 #Hf elim (eq_pnat_dec i2 j2)
-[ #H destruct /2 width=1 by or_introl/
-| /4 width=6 by gr_pat_mono, or_intror/
-]
-qed-.
-
-(*** is_at_dec *)
-lemma is_gr_pat_dec (f) (i2): 𝐓❪f❫ → Decidable (∃i1. @❪i1,f❫ ≘ i2).
-#f #i2 #Hf
-lapply (dec_plt (λi1.@❪i1,f❫ ≘ i2) … (↑i2)) [| * ]
-[ /2 width=1 by gr_pat_dec/
-| * /3 width=2 by ex_intro, or_introl/
-| #H @or_intror * #i1 #Hi12
-  /5 width=3 by gr_pat_increasing, plt_succ_dx, ex2_intro/
-]
-qed-.
-
-(* Main destructions with gr_pat ********************************************)
-
-(*** at_ext *)
-corec theorem gr_eq_ext_pat (f1) (f2): 𝐓❪f1❫ → 𝐓❪f2❫ →
-              (∀i,i1,i2. @❪i,f1❫ ≘ i1 → @❪i,f2❫ ≘ i2 → i1 = i2) →
-              f1 ≡ f2.
-cases (gr_map_split_tl f1) #H1
-cases (gr_map_split_tl f2) #H2
-#Hf1 #Hf2 #Hi
-[ @(gr_eq_push … H1 H2) @gr_eq_ext_pat -gr_eq_ext_pat
-  [3:|*: /2 width=3 by gr_ist_inv_push/ ] -Hf1 -Hf2 #i #i1 #i2 #Hg1 #Hg2
-  lapply (Hi (↑i) (↑i1) (↑i2) ??) /2 width=7 by gr_pat_push/
-| cases (Hf2 (𝟏)) -Hf1 -Hf2 -gr_eq_ext_pat
-  #j2 #Hf2 cases (gr_pat_increasing_strict … Hf2 … H2) -H2
-  lapply (Hi (𝟏) (𝟏) j2 … Hf2) /2 width=2 by gr_pat_refl/ -Hi -Hf2 -H1
-  #H2 #H cases (plt_ge_false … H) -H //
-| cases (Hf1 (𝟏)) -Hf1 -Hf2 -gr_eq_ext_pat
-  #j1 #Hf1 cases (gr_pat_increasing_strict … Hf1 … H1) -H1
-  lapply (Hi (𝟏) j1 (𝟏) Hf1 ?) /2 width=2 by gr_pat_refl/ -Hi -Hf1 -H2
-  #H1 #H cases (plt_ge_false … H) -H //
-| @(gr_eq_next … H1 H2) @gr_eq_ext_pat -gr_eq_ext_pat
-  [3:|*: /2 width=3 by gr_ist_inv_next/ ] -Hf1 -Hf2 #i #i1 #i2 #Hg1 #Hg2
-  lapply (Hi i (↑i1) (↑i2) ??) /2 width=5 by gr_pat_next/
-]
-qed-.