+++ /dev/null
-(**************************************************************************)
-(* ___ *)
-(* ||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 "basic_2/relocation/sex_length.ma".
-include "basic_2/relocation/lex.ma".
-
-(* GENERIC EXTENSION OF A CONTEXT-SENSITIVE REALTION FOR TERMS **************)
-
-(* Forward lemmas with length for local environments ************************)
-
-(* Basic_2A1: was: lpx_sn_fwd_length *)
-lemma lex_fwd_length: ∀R,L1,L2. L1 ⪤[R] L2 → |L1| = |L2|.
-#R #L1 #L2 * /2 width=4 by sex_fwd_length/
-qed-.