matita/matita/contribs/lambdadelta/static_2/syntax/teqo_teqx.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/syntax/teqx.ma".
  16 include "static_2/syntax/teqo.ma".
  17
  18 (* SORT-IRRELEVANT OUTER EQUIVALENCE FOR TERMS ******************************)
  19
  20 (* Properties with sort-irrelevant equivalence for terms ********************)
  21
  22 lemma teqx_teqo: ∀T1,T2. T1 ≛ T2 → T1 ⩳ T2.
  23 #T1 #T2 * -T1 -T2 /2 width=1 by teqo_sort, teqo_pair/
  24 qed.