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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_path.ma b/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_path.ma
deleted file mode 100644
index 08115e1e4..000000000
--- a/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_path.ma
+++ /dev/null
@@ -1,170 +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 "delayed_updating/unwind/unwind2_rmap.ma".
-include "delayed_updating/syntax/path_structure.ma".
-include "delayed_updating/notation/functions/black_downtriangle_2.ma".
-
-(* TAILED UNWIND FOR PATH ***************************************************)
-
-definition unwind2_path (f) (p): path ≝
-match p with
-[ list_empty     ⇒ (𝐞)
-| list_lcons l q ⇒
-  match l with
-  [ label_d k ⇒ (⊗q)◖𝗱(▶[f]q＠⧣❨k❩)
-  | label_m   ⇒ ⊗p
-  | label_L   ⇒ ⊗p
-  | label_A   ⇒ ⊗p
-  | label_S   ⇒ ⊗p
-  ]
-].
-
-interpretation
-  "tailed unwind (path)"
-  'BlackDownTriangle f p = (unwind2_path f p).
-
-(* Basic constructions ******************************************************)
-
-lemma unwind2_path_empty (f):
-      (𝐞) = ▼[f]𝐞.
-// qed.
-
-lemma unwind2_path_d_dx (f) (p) (k) :
-      (⊗p)◖𝗱((▶[f]p)＠⧣❨k❩) = ▼[f](p◖𝗱k).
-// qed.
-
-lemma unwind2_path_m_dx (f) (p):
-      ⊗p = ▼[f](p◖𝗺).
-// qed.
-
-lemma unwind2_path_L_dx (f) (p):
-      (⊗p)◖𝗟 = ▼[f](p◖𝗟).
-// qed.
-
-lemma unwind2_path_A_dx (f) (p):
-      (⊗p)◖𝗔 = ▼[f](p◖𝗔).
-// qed.
-
-lemma unwind2_path_S_dx (f) (p):
-      (⊗p)◖𝗦 = ▼[f](p◖𝗦).
-// qed.
-
-(* Constructions with structure *********************************************)
-
-lemma structure_unwind2_path (f) (p):
-      ⊗p = ⊗▼[f]p.
-#f * // * [ #k ] #p //
-qed.
-
-lemma unwind2_path_structure (f) (p):
-      ⊗p = ▼[f]⊗p.
-#f #p elim p -p // * [ #k ] #p #IH //
-[ <structure_L_dx <unwind2_path_L_dx //
-| <structure_A_dx <unwind2_path_A_dx //
-| <structure_S_dx <unwind2_path_S_dx //
-]
-qed.
-
-lemma unwind2_path_root (f) (p):
-      ∃∃r. 𝐞 = ⊗r & ⊗p●r = ▼[f]p.
-#f * [| * [ #k ] #p ]
-/2 width=3 by ex2_intro/
-<unwind2_path_d_dx <structure_d_dx
-/2 width=3 by ex2_intro/
-qed-.
-
-(* Destructions with structure **********************************************)
-
-lemma unwind2_path_des_structure (f) (q) (p):
-      ⊗q = ▼[f]p → ⊗q = ⊗p.
-// qed-.
-
-(* Basic inversions *********************************************************)
-
-lemma eq_inv_d_dx_unwind2_path (f) (q) (p) (h):
-      q◖𝗱h = ▼[f]p →
-      ∃∃r,k. q = ⊗r & h = ▶[f]r＠⧣❨k❩ & r◖𝗱k = p.
-#f #q * [| * [ #k ] #p ] #h
-[ <unwind2_path_empty #H0 destruct
-| <unwind2_path_d_dx #H0 destruct
-  /2 width=5 by ex3_2_intro/
-| <unwind2_path_m_dx #H0
-  elim (eq_inv_d_dx_structure … H0)
-| <unwind2_path_L_dx #H0 destruct
-| <unwind2_path_A_dx #H0 destruct
-| <unwind2_path_S_dx #H0 destruct
-]
-qed-.
-
-lemma eq_inv_m_dx_unwind2_path (f) (q) (p):
-      q◖𝗺 = ▼[f]p → ⊥.
-#f #q * [| * [ #k ] #p ]
-[ <unwind2_path_empty #H0 destruct
-| <unwind2_path_d_dx #H0 destruct
-| <unwind2_path_m_dx #H0
-  elim (eq_inv_m_dx_structure … H0)
-| <unwind2_path_L_dx #H0 destruct
-| <unwind2_path_A_dx #H0 destruct
-| <unwind2_path_S_dx #H0 destruct
-]
-qed-.
-
-lemma eq_inv_L_dx_unwind2_path (f) (q) (p):
-      q◖𝗟 = ▼[f]p →
-      ∃∃r1,r2. q = ⊗r1 & ∀g. 𝐞 = ▼[g]r2 & r1●𝗟◗r2 = p.
-#f #q * [| * [ #k ] #p ]
-[ <unwind2_path_empty #H0 destruct
-| <unwind2_path_d_dx #H0 destruct
-| <unwind2_path_m_dx #H0
-  elim (eq_inv_L_dx_structure … H0) -H0 #r1 #r2 #H1 #H2 #H3 destruct
-  /2 width=5 by ex3_2_intro/
-| <unwind2_path_L_dx #H0 destruct
-  /2 width=5 by ex3_2_intro/
-| <unwind2_path_A_dx #H0 destruct
-| <unwind2_path_S_dx #H0 destruct
-]
-qed-.
-
-lemma eq_inv_A_dx_unwind2_path (f) (q) (p):
-      q◖𝗔 = ▼[f]p →
-      ∃∃r1,r2. q = ⊗r1 & ∀g. 𝐞 = ▼[g]r2 & r1●𝗔◗r2 = p.
-#f #q * [| * [ #k ] #p ]
-[ <unwind2_path_empty #H0 destruct
-| <unwind2_path_d_dx #H0 destruct
-| <unwind2_path_m_dx #H0
-  elim (eq_inv_A_dx_structure … H0) -H0 #r1 #r2 #H1 #H2 #H3 destruct
-  /2 width=5 by ex3_2_intro/
-| <unwind2_path_L_dx #H0 destruct
-| <unwind2_path_A_dx #H0 destruct
-  /2 width=5 by ex3_2_intro/
-| <unwind2_path_S_dx #H0 destruct
-]
-qed-.
-
-lemma eq_inv_S_dx_unwind2_path (f) (q) (p):
-      q◖𝗦 = ▼[f]p →
-      ∃∃r1,r2. q = ⊗r1 & ∀g. 𝐞 = ▼[g]r2 & r1●𝗦◗r2 = p.
-#f #q * [| * [ #k ] #p ]
-[ <unwind2_path_empty #H0 destruct
-| <unwind2_path_d_dx #H0 destruct
-| <unwind2_path_m_dx #H0
-  elim (eq_inv_S_dx_structure … H0) -H0 #r1 #r2 #H1 #H2 #H3 destruct
-  /2 width=5 by ex3_2_intro/
-| <unwind2_path_L_dx #H0 destruct
-| <unwind2_path_A_dx #H0 destruct
-| <unwind2_path_S_dx #H0 destruct
-  /2 width=5 by ex3_2_intro/
-]
-qed-.