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diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_sor_sor_sle.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_sor_sor_sle.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 "ground/relocation/gr_sle.ma".
+include "ground/relocation/gr_sor.ma".
+
+(* RELATIONAL UNION FOR GENERIC RELOCATION MAPS ***********************************************************)
+
+(* Main inversion lemmas with inclusion ****************************************************)
+
+(*** monotonic_sle_sor *)
+axiom gr_sor_monotonic_sle:
+      ∀f1,g1. f1 ⊆ g1 → ∀f2,g2. f2 ⊆ g2 →
+      ∀f. f1 ⋓ f2 ≘ f → ∀g. g1 ⋓ g2 ≘ g → f ⊆ g.