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diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc/cpxs/cpxs_lreq.etc b/matita/matita/contribs/lambdadelta/basic_2/etc/cpxs/cpxs_lreq.etc
new file mode 100644
index 000000000..ec7a863c7
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/basic_2/etc/cpxs/cpxs_lreq.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/reduction/cpx_lreq.ma".
+include "basic_2/computation/cpxs.ma".
+
+(* CONTEXT-SENSITIVE EXTENDED PARALLEL COMPUTATION ON TERMS *****************)
+
+(* Properties on equivalence for local environments *************************)
+
+lemma lreq_cpxs_trans: ∀h,o,G. lsub_trans … (cpxs h o G) (lreq 0 (∞)).
+/3 width=5 by lreq_cpx_trans, LTC_lsub_trans/
+qed-.