matita/matita/contribs/lambdadelta/static_2/static/feqg_length.ma

   1 (**************************************************************************)
   2 (*       ___                                                              *)
   3 (*      ||M||                                                             *)
   4 (*      ||A||       A project by Andrea Asperti                           *)
   5 (*      ||T||                                                             *)
   6 (*      ||I||       Developers:                                           *)
   7 (*      ||T||         The HELM team.                                      *)
   8 (*      ||A||         http://helm.cs.unibo.it                             *)
   9 (*      \   /                                                             *)
  10 (*       \ /        This file is distributed under the terms of the       *)
  11 (*        v         GNU General Public License Version 2                  *)
  12 (*                                                                        *)
  13 (**************************************************************************)
  14
  15 include "static_2/static/reqg_length.ma".
  16 include "static_2/static/feqg.ma".
  17
  18 (* GENERIC EQUIVALENCE FOR CLOSURES ON REFERRED ENTRIES *********************)
  19
  20 (* Forward lemmas with length for local environments ************************)
  21
  22 lemma feqg_fwd_length (S) (G1) (G2) (L1) (L2) (T1) (T2):
  23       ❪G1,L1,T1❫ ≛[S] ❪G2,L2,T2❫ → |L1| = |L2|.
  24 /3 width=6 by feqg_fwd_reqg_sn, reqg_fwd_length/ qed-.