we finally understood what tsts is, :)

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / syntax / theq_tdeq.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/syntax/theq_tdeq.ma b/matita/matita/contribs/lambdadelta/basic_2/syntax/theq_tdeq.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 "basic_2/syntax/tdeq.ma".
+include "basic_2/syntax/theq.ma".
+
+(* HEAD EQUIVALENCE FOR TERMS ***********************************************)
+
+(* Properties with degree-based equivalence for terms ***********************)
+
+lemma tdeq_theq: ∀h,o,T1,T2. T1 ≡[h, o] T2 → T1 ⩳[h, o] T2.
+#h #o #T1 #T2 * -T1 -T2 /2 width=3 by theq_sort, theq_pair/
+qed.