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diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc_2A1/llpr/cprs_lift.etc b/matita/matita/contribs/lambdadelta/basic_2/etc_2A1/llpr/cprs_lift.etc
deleted file mode 100644
index 27f0bb6e5..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/etc_2A1/llpr/cprs_lift.etc
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@@ -1,63 +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/reduction/llpr_ldrop.ma".
-include "basic_2/computation/cprs.ma".
-
-(* CONTEXT-SENSITIVE PARALLEL COMPUTATION ON TERMS **************************)
-
-(* Advanced properties ******************************************************)
-
-(* Note: apparently this was missing in basic_1 *)
-lemma cprs_delta: ∀G,L,K,V,V2,i.
-                  ⇩[i] L ≡ K.ⓓV → ⦃G, K⦄ ⊢ V ➡* V2 →
-                  ∀W2. ⇧[0, i + 1] V2 ≡ W2 → ⦃G, L⦄ ⊢ #i ➡* W2.
-#G #L #K #V #V2 #i #HLK #H elim H -V2 [ /3 width=6 by cpr_cprs, cpr_delta/ ]
-#V1 #V2 #_ #HV12 #IHV1 #W2 #HVW2
-lapply (ldrop_fwd_drop2 … HLK) -HLK #HLK
-elim (lift_total V1 0 (i+1)) /4 width=12 by cpr_lift, cprs_strap1/
-qed.
-
-lemma cprs_llpr_conf: ∀G. s_r_confluent1 … (cprs G) (llpr G 0).
-/3 width=5 by llpr_cpr_conf, s_r_conf1_LTC1/ qed-.
-
-(* Advanced inversion lemmas ************************************************)
-
-(* Basic_1: was: pr3_gen_lref *)
-lemma cprs_inv_lref1: ∀G,L,T2,i. ⦃G, L⦄ ⊢ #i ➡* T2 →
-                      T2 = #i ∨
-                      ∃∃K,V1,T1. ⇩[i] L ≡ K.ⓓV1 & ⦃G, K⦄ ⊢ V1 ➡* T1 &
-                                 ⇧[0, i + 1] T1 ≡ T2.
-#G #L #T2 #i #H @(cprs_ind … H) -T2 /2 width=1 by or_introl/
-#T #T2 #_ #HT2 *
-[ #H destruct
-  elim (cpr_inv_lref1 … HT2) -HT2 /2 width=1 by or_introl/
-  * /4 width=6 by cpr_cprs, ex3_3_intro, or_intror/
-| * #K #V1 #T1 #HLK #HVT1 #HT1
-  lapply (ldrop_fwd_drop2 … HLK) #H0LK
-  elim (cpr_inv_lift1 … HT2 … H0LK … HT1) -H0LK -T
- /4 width=6 by cprs_strap1, ex3_3_intro, or_intror/
-]
-qed-.
-
-(* Relocation properties ****************************************************)
-
-(* Basic_1: was: pr3_lift *)
-lemma cprs_lift: ∀G. l_liftable (cprs G).
-/3 width=10 by l_liftable_LTC, cpr_lift/ qed.
-
-(* Basic_1: was: pr3_gen_lift *)
-lemma cprs_inv_lift1: ∀G. l_deliftable_sn (cprs G).
-/3 width=6 by l_deliftable_sn_LTC, cpr_inv_lift1/
-qed-.