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diff --git a/matita/matita/contribs/lambda-delta/Basic-2/reduction/cpr_lift.ma b/matita/matita/contribs/lambda-delta/Basic-2/reduction/cpr_lift.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/reduction/tpr_lift.ma".
+include "Basic-2/reduction/cpr.ma".
+
+(* CONTEXT-SENSITIVE PARALLEL REDUCTION ON TERMS ****************************)
+
+(* Relocation properties ****************************************************)
+
+(* Basic-1: was: pr2_lift *)
+
+(* Basic-1: was: pr2_gen_lift *)
+
+(* Advanced inversion lemmas ************************************************)
+
+(* Basic-1: was: pr2_gen_abst *)
+lemma cpr_inv_abst1: ∀V1,T1,U2. 𝕔{Abst} V1. T1 ⇒ U2 →
+                     ∃∃V2,T2. V1 ⇒ V2 & T1 ⇒ T2 & U2 = 𝕔{Abst} V2. T2.
+/2/ qed.