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diff --git a/matita/matita/contribs/lambda_delta/basic_2/reducibility/crf_append.ma b/matita/matita/contribs/lambda_delta/basic_2/reducibility/crf_append.ma
deleted file mode 100644
index f50b97e95..000000000
--- a/matita/matita/contribs/lambda_delta/basic_2/reducibility/crf_append.ma
+++ /dev/null
@@ -1,56 +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 "basic_2/substitution/ldrop_append.ma".
-include "basic_2/reducibility/crf.ma".
-
-(* CONTEXT-SENSITIVE REDUCIBLE TERMS ****************************************)
-
-(* Advanved properties ******************************************************)
-
-lemma crf_labst_last: ∀L,T,W. L ⊢ 𝐑⦃T⦄  → ⋆.ⓛW @@ L ⊢ 𝐑⦃T⦄.
-#L #T #W #H elim H -L -T /2 width=1/
-#L #K #V #i #HLK
-lapply (ldrop_fwd_ldrop2_length … HLK) #Hi
-lapply (ldrop_O1_append_sn_le … HLK … (⋆.ⓛW)) -HLK /2 width=2/ -Hi /2 width=3/
-qed.
-
-lemma crf_trf: ∀T,W. ⋆ ⊢ 𝐑⦃T⦄ → ⋆.ⓛW ⊢ 𝐑⦃T⦄.
-#T #W #H lapply (crf_labst_last … W H) //
-qed.
-
-(* Advanced inversion lemmas ************************************************)
-
-fact crf_inv_labst_last_aux: ∀L1,T,W. L1 ⊢ 𝐑⦃T⦄  →
-                             ∀L2. L1 = ⋆.ⓛW @@ L2 → L2 ⊢ 𝐑⦃T⦄.
-#L1 #T #W #H elim H -L1 -T /2 width=1/ /3 width=1/
-[ #L1 #K1 #V1 #i #HLK1 #L2 #H destruct
-  lapply (ldrop_fwd_ldrop2_length … HLK1)
-  >append_length >commutative_plus normalize in ⊢ (??% → ?); #H
-  elim (le_to_or_lt_eq i (|L2|) ?) /2 width=1/ -H #Hi destruct
-  [ elim (ldrop_O1_lt … Hi) #I2 #K2 #V2 #HLK2
-    lapply (ldrop_O1_inv_append1_le … HLK1 … HLK2) -HLK1 /2 width=2/ -Hi
-    normalize #H destruct /2 width=3/
-  | lapply (ldrop_O1_inv_append1_ge … HLK1 ?) -HLK1 // <minus_n_n #H
-    lapply (ldrop_inv_refl … H) -H #H destruct
-  ]
-| #a #I #L1 #V #T #HI #_ #IHT #L2 #H destruct /3 width=1/
-]
-qed.
-
-lemma crf_inv_labst_last: ∀L,T,W. ⋆.ⓛW @@ L ⊢ 𝐑⦃T⦄  → L ⊢ 𝐑⦃T⦄.
-/2 width=4/ qed-.
-
-lemma crf_inv_trf: ∀T,W. ⋆.ⓛW ⊢ 𝐑⦃T⦄  → ⋆ ⊢ 𝐑⦃T⦄.
-/2 width=4/ qed-.