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diff --git a/matita/matita/contribs/lambdadelta/static_2/relocation/seq_length.ma b/matita/matita/contribs/lambdadelta/static_2/relocation/seq_length.ma
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index 000000000..3ea6b84b1
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+++ b/matita/matita/contribs/lambdadelta/static_2/relocation/seq_length.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 "static_2/relocation/sex_length.ma".
+include "static_2/relocation/seq.ma".
+
+(* SYNTACTIC EQUIVALENCE FOR SELECTED LOCAL ENVIRONMENTS ********************)
+
+(* Forward lemmas with length for local environments ************************)
+
+(* Basic_2A1: includes: lreq_fwd_length *)
+lemma seq_fwd_length: ∀f,L1,L2. L1 ≡[f] L2 → |L1| = |L2|.
+/2 width=4 by sex_fwd_length/ qed-.