wip in delayed_updating

[helm.git] / matita / matita / contribs / lambdadelta / delayed_updating / syntax / path_guard.ma

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/syntax/path_guard.ma b/matita/matita/contribs/lambdadelta/delayed_updating/syntax/path_guard.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 "delayed_updating/syntax/path.ma".
+include "delayed_updating/notation/functions/class_g_0.ma".
+include "ground/lib/subset.ma".
+
+(* GUARD CONDITION FOR PATH *************************************************)
+
+inductive pgc: predicate path ≝
+| pgc_empty: (𝐞) ϵ pgc
+| pgc_L_dx (p): p◖𝗟 ϵ pgc
+.
+
+interpretation
+  "guard condition (path)"
+  'ClassG = (pgc).