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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_ist.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_ist.ma
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--- a/matita/matita/contribs/lambdadelta/ground/relocation/gr_ist.ma
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-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||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/notation/relations/predicate_t_1.ma".
-include "ground/relocation/gr_pat.ma".
-
-(* TOTALITY CONDITION FOR GENERIC RELOCATION MAPS ***************************)
-
-(*** istot *)
-definition gr_ist: predicate gr_map ≝
-           λf. ∀i. ∃j. @❪i,f❫ ≘ j.
-
-interpretation
-  "totality condition (generic relocation maps)"
-  'PredicateT f = (gr_ist f).
-
-(* Basic inversions *********************************************************)
-
-(*** istot_inv_push *)
-lemma gr_ist_inv_push (g): 𝐓❪g❫ → ∀f. ⫯f = g → 𝐓❪f❫.
-#g #Hg #f #H #i elim (Hg (↑i)) -Hg
-#j #Hg elim (gr_pat_inv_succ_push … Hg … H) -Hg -H /2 width=3 by ex_intro/
-qed-.
-
-(*** istot_inv_next *)
-lemma gr_ist_inv_next (g): 𝐓❪g❫ → ∀f. ↑f = g → 𝐓❪f❫.
-#g #Hg #f #H #i elim (Hg i) -Hg
-#j #Hg elim (gr_pat_inv_next … Hg … H) -Hg -H /2 width=2 by ex_intro/
-qed-.
-
-(* Constructions with gr_tl *************************************************)
-
-(*** istot_tl *)
-lemma gr_ist_tl (f): 𝐓❪f❫ → 𝐓❪⫰f❫.
-#f cases (gr_map_split_tl f) *
-/2 width=3 by gr_ist_inv_next, gr_ist_inv_push/
-qed.