the refactoring continues ...

[helm.git] / matita / matita / contribs / lambda-delta / Basic-2 / substitution / lift_weight.ma

diff --git a/matita/matita/contribs/lambda-delta/Basic-2/substitution/lift_weight.ma b/matita/matita/contribs/lambda-delta/Basic-2/substitution/lift_weight.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 "lambda-delta/syntax/weight.ma".
+include "lambda-delta/substitution/lift.ma".
+
+(* RELOCATION ***************************************************************)
+
+lemma tw_lift: ∀d,e,T1,T2. ↑[d, e] T1 ≡ T2 → #T1 = #T2.
+#d #e #T1 #T2 #H elim H -d e T1 T2; normalize //
+qed.