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diff --git a/matita/matita/contribs/lambda_delta/Basic_2/unfold/lifts_lifts.ma b/matita/matita/contribs/lambda_delta/Basic_2/unfold/lifts_lifts.ma
index 3cbd346ca..331de05df 100644
--- a/matita/matita/contribs/lambda_delta/Basic_2/unfold/lifts_lifts.ma
+++ b/matita/matita/contribs/lambda_delta/Basic_2/unfold/lifts_lifts.ma
@@ -12,24 +12,12 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "Basic_2/substitution/lift_lift.ma".
-include "Basic_2/unfold/lifts.ma".
+include "Basic_2/unfold/lifts_lift.ma".
 
 (* GENERIC RELOCATION *******************************************************)
 
 (* Main properties **********************************************************)
 
-(* Basic_1: was: lift1_xhg *)
-lemma lifts_lift_trans_le: ∀T1,T,des. ⇧*[des] T1 ≡ T → ∀T2. ⇧[0, 1] T ≡ T2 →
-                           ∃∃T0. ⇧[0, 1] T1 ≡ T0 & ⇧*[ss des] T0 ≡ T2.
-#T1 #T #des #H elim H -T1 -T -des
-[ /2 width=3/
-| #T1 #T3 #T #des #d #e #HT13 #_ #IHT13 #T2 #HT2
-  elim (IHT13 … HT2) -T #T #HT3 #HT2
-  elim (lift_trans_le … HT13 … HT3 ?) -T3 // /3 width=5/
-]
-qed-.
-
 (* Basic_1: was: lift1_lift1 *)
 theorem lifts_trans: ∀T1,T,des1. ⇧*[des1] T1 ≡ T → ∀T2:term. ∀des2. ⇧*[des2] T ≡ T2 →
                      ⇧*[des1 @ des2] T1 ≡ T2.