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diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc/xpr/xprs_cprs.etc b/matita/matita/contribs/lambdadelta/basic_2/etc/xpr/xprs_cprs.etc
new file mode 100644
index 000000000..13a4f8889
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/basic_2/etc/xpr/xprs_cprs.etc
@@ -0,0 +1,24 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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/computation/cprs.ma".
+include "basic_2/computation/xprs.ma".
+
+(* EXTENDED PARALLEL COMPUTATION ON TERMS ***********************************)
+
+(* properties on context sensitive parallel computation for terms ***********)
+
+lemma cprs_xprs: ∀h,g,L,T1,T2. L ⊢ T1 ➡* T2 → ⦃h, L⦄ ⊢ T1 •➡*[g] T2.
+#h #g #L #T1 #T2 #H @(cprs_ind … H) -T2 // /3 width=3/
+qed.