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diff --git a/matita/matita/contribs/lambdadelta/basic_2/computation/lpxs_cpye.ma b/matita/matita/contribs/lambdadelta/basic_2/computation/lpxs_cpye.ma
deleted file mode 100644
index a6f0f86bd..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/computation/lpxs_cpye.ma
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@@ -1,36 +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/cpye_lift.ma".
-include "basic_2/reduction/lpx_cpye.ma".
-include "basic_2/computation/cpxs_cpxs.ma".
-include "basic_2/computation/lpxs.ma".
-
-(* SN EXTENDED PARALLEL COMPUTATION ON LOCAL ENVIRONMENTS *******************)
-
-(* Forward lemmas on evaluation for extended substitution *******************)
-
-lemma cpx_cpye_fwd_lpxs: ∀h,g,G,L1,L2. ⦃G, L1⦄ ⊢ ➡*[h, g] L2 →
-                         ∀T1,T2. ⦃G, L1⦄ ⊢ T1 ➡[h, g] T2 →
-                         ∀U1,d,e. ⦃G, L1⦄ ⊢ T1 ▶*[d, e] 𝐍⦃U1⦄ →
-                         ∀U2. ⦃G, L2⦄ ⊢ T2 ▶*[d, e] 𝐍⦃U2⦄ →
-                         ⦃G, L1⦄ ⊢ U1 ➡*[h, g] U2.
-#h #g #G #L1 #L2 #H @(lpxs_ind_dx … H) -L1
-[ /3 width=9 by cpx_cpxs, cpx_cpye_fwd_lpx/
-| #L1 #L #HL1 #_ #IHL2 #T1 #T2 #HT12 #U1 #d #e #HTU1 #U2 #HTU2
-  elim (cpye_total G L T2 d e) #X2 #HTX2
-  lapply (cpx_cpye_fwd_lpx … HT12 … HL1 … HTU1 … HTX2) -T1
-  /4 width=9 by lpx_cpxs_trans, cpxs_strap2/ (**) (* full auto too long: 41s *)
-]
-qed-.