update in delayed_updating

[helm.git] / matita / matita / contribs / lambdadelta / delayed_updating / etc / unwind3 / unwind_prototerm.etc

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/etc/unwind3/unwind_prototerm.etc b/matita/matita/contribs/lambdadelta/delayed_updating/etc/unwind3/unwind_prototerm.etc
new file mode 100644 (file)
index 0000000..c4a103b
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/etc/unwind3/unwind_prototerm.etc
@@ -0,0 +1,30 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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/unwind3/unwind.ma".
+include "delayed_updating/syntax/prototerm.ma".
+include "ground/lib/subset_ext.ma".
+
+(* UNWIND FOR PROTOTERM *****************************************************)
+
+interpretation
+  "unwind (prototerm)"
+  'BlackDownTriangle f t = (subset_ext_f1 ? ? (unwind_gen ? proj_path f) t).
+
+(* Basic constructions ******************************************************)
+
+lemma in_comp_unwind_bi (f) (p) (t):
+      p ϵ t → ▼[f]p ϵ ▼[f]t.
+/2 width=1 by subset_in_ext_f1_dx/
+qed.