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diff --git a/matita/matita/contribs/lambda_delta/basic_2/unfold/frsups.ma b/matita/matita/contribs/lambda_delta/basic_2/unfold/frsups.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 "basic_2/unfold/frsupp.ma".
-
-(* STAR-ITERATED RESTRICTED SUPCLOSURE **************************************)
-
-definition frsups: bi_relation lenv term ≝ bi_star … frsup.
-
-interpretation "star-iterated restricted structural predecessor (closure)"
-   'RestSupTermStar L1 T1 L2 T2 = (frsups L1 T1 L2 T2).
-
-(* Basic eliminators ********************************************************)
-
-lemma frsups_ind: ∀L1,T1. ∀R:relation2 lenv term. R L1 T1 →
-                  (∀L,L2,T,T2. ⦃L1, T1⦄ ⧁* ⦃L, T⦄ → ⦃L, T⦄ ⧁ ⦃L2, T2⦄ → R L T → R L2 T2) →
-                  ∀L2,T2. ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄ → R L2 T2.
-#L1 #T1 #R #IH1 #IH2 #L2 #T2 #H
-@(bi_star_ind … IH1 IH2 ? ? H)
-qed-.
-
-lemma frsups_ind_dx: ∀L2,T2. ∀R:relation2 lenv term. R L2 T2 →
-                     (∀L1,L,T1,T. ⦃L1, T1⦄ ⧁ ⦃L, T⦄ → ⦃L, T⦄ ⧁* ⦃L2, T2⦄ → R L T → R L1 T1) →
-                     ∀L1,T1. ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄ → R L1 T1.
-#L2 #T2 #R #IH1 #IH2 #L1 #T1 #H
-@(bi_star_ind_dx … IH1 IH2 ? ? H)
-qed-.
-
-(* Basic properties *********************************************************)
-
-lemma frsups_refl: bi_reflexive … frsups.
-/2 width=1/ qed.
-
-lemma frsupp_frsups: ∀L1,L2,T1,T2. ⦃L1, T1⦄ ⧁+ ⦃L2, T2⦄ → ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄.
-/2 width=1/ qed.
-
-lemma frsup_frsups: ∀L1,L2,T1,T2. ⦃L1, T1⦄ ⧁ ⦃L2, T2⦄ → ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄.
-/2 width=1/ qed.
-
-lemma frsups_strap1: ∀L1,L,L2,T1,T,T2. ⦃L1, T1⦄ ⧁* ⦃L, T⦄ → ⦃L, T⦄ ⧁ ⦃L2, T2⦄ →
-                     ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄.
-/2 width=4/ qed.
-
-lemma frsups_strap2: ∀L1,L,L2,T1,T,T2. ⦃L1, T1⦄ ⧁ ⦃L, T⦄ → ⦃L, T⦄ ⧁* ⦃L2, T2⦄ →
-                     ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄.
-/2 width=4/ qed.
-
-lemma frsups_frsupp_frsupp: ∀L1,L,L2,T1,T,T2. ⦃L1, T1⦄ ⧁* ⦃L, T⦄ →
-                            ⦃L, T⦄ ⧁+ ⦃L2, T2⦄ → ⦃L1, T1⦄ ⧁+ ⦃L2, T2⦄.
-/2 width=4/ qed.
-
-lemma frsupp_frsups_frsupp: ∀L1,L,L2,T1,T,T2. ⦃L1, T1⦄ ⧁+ ⦃L, T⦄ →
-                            ⦃L, T⦄ ⧁* ⦃L2, T2⦄ → ⦃L1, T1⦄ ⧁+ ⦃L2, T2⦄.
-/2 width=4/ qed.
-
-(* Basic inversion lemmas ***************************************************)
-
-lemma frsups_inv_all: ∀L1,L2,T1,T2. ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄ →
-                      (L1 = L2 ∧ T1 = T2) ∨ ⦃L1, T1⦄ ⧁+ ⦃L2, T2⦄.
-#L1 #L2 #T1 #T2 * /2 width=1/
-qed-.
-
-(* Basic forward lemmas *****************************************************)
-
-lemma frsups_fwd_fw: ∀L1,L2,T1,T2. ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄ → #{L2, T2} ≤ #{L1, T1}.
-#L1 #L2 #T1 #T2 #H elim (frsups_inv_all … H) -H [ * // ]
-/3 width=1 by frsupp_fwd_fw, lt_to_le/
-qed-.
-
-lemma frsups_fwd_lw: ∀L1,L2,T1,T2. ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄ → #{L1} ≤ #{L2}.
-#L1 #L2 #T1 #T2 #H elim (frsups_inv_all … H) -H [ * // ]
-/2 width=3 by frsupp_fwd_lw/
-qed-.
-
-lemma frsups_fwd_tw: ∀L1,L2,T1,T2. ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄ → #{T2} ≤ #{T1}.
-#L1 #L2 #T1 #T2 #H elim (frsups_inv_all … H) -H [ * // ]
-/3 width=3 by frsupp_fwd_tw, lt_to_le/
-qed-.
-
-lemma frsups_fwd_append: ∀L1,L2,T1,T2. ⦃L1, T1⦄ ⧁* ⦃L2, T2⦄ → ∃L. L2 = L1 @@ L.
-#L1 #L2 #T1 #T2 #H elim (frsups_inv_all … H) -H
-[ * #H1 #H2 destruct
-  @(ex_intro … (⋆)) //
-| /2 width=3 by frsupp_fwd_append/
-qed-.
-
-(* Advanced forward lemmas ***************************************************)
-
-lemma lift_frsups_trans: ∀T1,U1,d,e. ⇧[d, e] T1 ≡ U1 →
-                         ∀L,K,U2. ⦃L, U1⦄ ⧁* ⦃L @@ K, U2⦄ →
-                         ∃T2. ⇧[d + |K|, e] T2 ≡ U2.
-#T1 #U1 #d #e #HTU1 #L #K #U2 #H elim (frsups_inv_all … H) -H
-[ * #H1 #H2 destruct
-  >(append_inv_refl_dx … (sym_eq … H1)) -H1 normalize /2 width=2/
-| /2 width=5 by lift_frsupp_trans/
-]
-qed-.
-
-(* Advanced inversion lemmas for frsupp **************************************)
-
-lemma frsupp_inv_atom1_frsups: ∀J,L1,L2,T2. ⦃L1, ⓪{J}⦄ ⧁+ ⦃L2, T2⦄ → ⊥.
-#J #L1 #L2 #T2 #H @(frsupp_ind … H) -L2 -T2 //
-#L2 #T2 #H elim (frsup_inv_atom1 … H)
-qed-.
-
-lemma frsupp_inv_bind1_frsups: ∀b,J,L1,L2,W,U,T2. ⦃L1, ⓑ{b,J}W.U⦄ ⧁+ ⦃L2, T2⦄ →
-                               ⦃L1, W⦄ ⧁* ⦃L2, T2⦄ ∨ ⦃L1.ⓑ{J}W, U⦄ ⧁* ⦃L2, T2⦄.
-#b #J #L1 #L2 #W #U #T2 #H @(frsupp_ind … H) -L2 -T2
-[ #L2 #T2 #H
-  elim (frsup_inv_bind1 … H) -H * #H1 #H2 destruct /2 width=1/
-| #L #T #L2 #T2 #_ #HT2 * /3 width=4/
-]
-qed-.
-
-lemma frsupp_inv_flat1_frsups: ∀J,L1,L2,W,U,T2. ⦃L1, ⓕ{J}W.U⦄ ⧁+ ⦃L2, T2⦄ →
-                               ⦃L1, W⦄ ⧁* ⦃L2, T2⦄ ∨ ⦃L1, U⦄ ⧁* ⦃L2, T2⦄.
-#J #L1 #L2 #W #U #T2 #H @(frsupp_ind … H) -L2 -T2
-[ #L2 #T2 #H
-  elim (frsup_inv_flat1 … H) -H #H1 * #H2 destruct /2 width=1/
-| #L #T #L2 #T2 #_ #HT2 * /3 width=4/
-]
-qed-.