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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_prototerm_inner.ma b/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_prototerm_inner.ma
new file mode 100644
index 000000000..7cbe69e0c
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+++ b/matita/matita/contribs/lambdadelta/delayed_updating/unwind/unwind2_prototerm_inner.ma
@@ -0,0 +1,28 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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/unwind/unwind2_prototerm.ma".
+include "delayed_updating/unwind/unwind2_path_inner.ma".
+include "ground/lib/subset_overlap.ma".
+
+(* UNWIND FOR PROTOTERM *****************************************************)
+
+(* Destructions with inner condition for path *******************************)
+
+lemma unwind2_term_des_inner (f) (t):
+      ▼[f]t ≬ 𝐈 → t ≬ 𝐈.
+#f #t * #p * #q #Hq #H0 #Hp destruct
+@(subset_ol_i … Hq) -Hq (**) (* auto does not work *)
+@(unwind2_path_des_inner … Hp)
+qed-.