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diff --git a/matita/matita/contribs/lambda_delta/basic_2/etc/csup/yprs_yprs.etc b/matita/matita/contribs/lambda_delta/basic_2/etc/csup/yprs_yprs.etc
new file mode 100644
index 000000000..d737dd817
--- /dev/null
+++ b/matita/matita/contribs/lambda_delta/basic_2/etc/csup/yprs_yprs.etc
@@ -0,0 +1,20 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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/yprs.ma".
+
+(* HYPER PARALLEL COMPUTATION ON TERMS **************************************)
+
+theorem yprs_trans: ∀h,g. bi_transitive … (yprs h g).
+/2 width=4/ qed-.