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diff --git a/matita/matita/contribs/lambdadelta/basic_1A/tlist/defs.ma b/matita/matita/contribs/lambdadelta/basic_1A/tlist/defs.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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+(* This file was automatically generated: do not edit *********************)
+
+include "basic_1A/T/defs.ma".
+
+inductive TList: Type[0] \def
+| TNil: TList
+| TCons: T \to (TList \to TList).
+
+rec definition THeads (k: K) (us: TList) on us: T \to T \def \lambda (t: 
+T).(match us with [TNil \Rightarrow t | (TCons u ul) \Rightarrow (THead k u 
+(THeads k ul t))]).
+
+rec definition TApp (ts: TList) on ts: T \to TList \def \lambda (v: T).(match 
+ts with [TNil \Rightarrow (TCons v TNil) | (TCons t ts0) \Rightarrow (TCons t 
+(TApp ts0 v))]).
+
+rec definition tslen (ts: TList) on ts: nat \def match ts with [TNil 
+\Rightarrow O | (TCons _ ts0) \Rightarrow (S (tslen ts0))].
+
+definition tslt:
+ TList \to (TList \to Prop)
+\def
+ \lambda (ts1: TList).(\lambda (ts2: TList).(lt (tslen ts1) (tslen ts2))).
+