matita/matita/contribs/lambdadelta/ground/relocation/tr_id.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 "ground/notation/functions/element_i_0.ma".
  16 include "ground/relocation/tr_pn.ma".
  17
  18 (* IDENTITY ELEMENT FOR TOTAL RELOCATION MAPS *******************************)
  19
  20 corec definition tr_id: tr_map ≝ ⫯tr_id.
  21
  22 interpretation
  23   "identity element (total relocation streams)"
  24   'ElementI = (tr_id).
  25
  26 (* Basic constructions (specific) *******************************************)
  27
  28 lemma tr_id_unfold: ⫯𝐢 = 𝐢.
  29 <(stream_unfold … (𝐢)) in ⊢ (???%); //
  30 qed.