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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_isf.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_isf.ma
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--- a/matita/matita/contribs/lambdadelta/ground/relocation/gr_isf.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_f_1.ma".
-include "ground/relocation/gr_fcla.ma".
-
-(* FINITE COLENGTH CONDITION FOR GENERIC RELOCATION MAPS ********************)
-
-(*** isfin *)
-definition gr_isf: predicate gr_map ≝
-           λf. ∃n. 𝐂❪f❫ ≘ n.
-
-interpretation
-  "finite colength condition (generic relocation maps)"
-  'PredicateF f = (gr_isf f).
-
-(* Basic eliminations *******************************************************)
-
-(*** isfin_ind *)
-lemma gr_isf_ind (Q:predicate …):
-      (∀f.  𝐈❪f❫ → Q f) →
-      (∀f. 𝐅❪f❫ → Q f → Q (⫯f)) →
-      (∀f. 𝐅❪f❫ → Q f → Q (↑f)) →
-      ∀f. 𝐅❪f❫ → Q f.
-#Q #IH1 #IH2 #IH3 #f #H elim H -H
-#n #H elim H -f -n /3 width=2 by ex_intro/
-qed-.
-
-(* Basic inversions *********************************************************)
-
-(*** isfin_inv_push *)
-lemma gr_isf_inv_push (g): 𝐅❪g❫ → ∀f. ⫯f = g → 𝐅❪f❫.
-#g * /3 width=4 by gr_fcla_inv_push, ex_intro/
-qed-.
-
-(*** isfin_inv_next *)
-lemma gr_isf_inv_next (g): 𝐅❪g❫ → ∀f. ↑f = g → 𝐅❪f❫.
-#g * #n #H #f #H0 elim (gr_fcla_inv_next … H … H0) -g
-/2 width=2 by ex_intro/
-qed-.
-
-(* Basic constructions ******************************************************)
-
-(*** isfin_isid *)
-lemma gr_isf_isi (f): 𝐈❪f❫ → 𝐅❪f❫.
-/3 width=2 by gr_fcla_isi, ex_intro/ qed.
-
-(*** isfin_push *)
-lemma gr_isf_push (f): 𝐅❪f❫ → 𝐅❪⫯f❫.
-#f * /3 width=2 by gr_fcla_push, ex_intro/
-qed.
-
-(*** isfin_next *)
-lemma gr_isf_next (f): 𝐅❪f❫ → 𝐅❪↑f❫.
-#f * /3 width=2 by gr_fcla_next, ex_intro/
-qed.