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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/rdsx_length.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/rdsx_length.ma
deleted file mode 100644
index 75177be45..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/rdsx_length.ma
+++ /dev/null
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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/static/rdeq_length.ma".
-include "basic_2/rt_transition/lpx_length.ma".
-include "basic_2/rt_computation/rdsx.ma".
-
-(* STRONGLY NORMALIZING REFERRED LOCAL ENV.S FOR UNBOUND RT-TRANSITION ******)
-
-(* Advanced properties ******************************************************)
-
-(* Basic_2A1: uses: lsx_sort *)
-lemma rdsx_sort (h) (G): ∀L,s. G ⊢ ⬈*[h,⋆s] 𝐒⦃L⦄.
-#h #G #L1 #s @rdsx_intro #L2 #H #Hs
-elim Hs -Hs /3 width=3 by lpx_fwd_length, rdeq_sort_length/
-qed.
-
-(* Basic_2A1: uses: lsx_gref *)
-lemma rdsx_gref (h) (G): ∀L,l. G ⊢ ⬈*[h,§l] 𝐒⦃L⦄.
-#h #G #L1 #s @rdsx_intro #L2 #H #Hs
-elim Hs -Hs /3 width=3 by lpx_fwd_length, rdeq_gref_length/
-qed.
-
-lemma rdsx_unit (h) (G): ∀I,L. G ⊢ ⬈*[h,#0] 𝐒⦃L.ⓤ{I}⦄.
-#h #G #I #L1 @rdsx_intro
-#Y #HY #HnY elim HnY -HnY
-elim (lpx_inv_unit_sn … HY) -HY #L2 #HL12 #H destruct
-/3 width=3 by lpx_fwd_length, rdeq_unit_length/
-qed.