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diff --git a/helm/software/matita/contribs/LAMBDA-TYPES/Level-1/LambdaDelta/iso/defs.ma b/helm/software/matita/contribs/LAMBDA-TYPES/Level-1/LambdaDelta/iso/defs.ma
new file mode 100644
index 000000000..cf815b7bc
--- /dev/null
+++ b/helm/software/matita/contribs/LAMBDA-TYPES/Level-1/LambdaDelta/iso/defs.ma
@@ -0,0 +1,26 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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 *********************)
+
+set "baseuri" "cic:/matita/LAMBDA-TYPES/Level-1/LambdaDelta/iso/defs".
+
+include "T/defs.ma".
+
+inductive iso: T \to (T \to Prop) \def
+| iso_sort: \forall (n1: nat).(\forall (n2: nat).(iso (TSort n1) (TSort n2)))
+| iso_lref: \forall (i1: nat).(\forall (i2: nat).(iso (TLRef i1) (TLRef i2)))
+| iso_head: \forall (k: K).(\forall (v1: T).(\forall (v2: T).(\forall (t1: 
+T).(\forall (t2: T).(iso (THead k v1 t1) (THead k v2 t2)))))).
+