matita/matita/contribs/lambdadelta/apps_2/etc/models/model_valign.etc

   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_2/lib/functions.ma".
  16 include "ground_2/lib/exteq.ma".
  17 include "apps_2/models/model.ma".
  18
  19 (* MODEL ********************************************************************)
  20
  21 definition valign (M) (l): evaluation M → evaluation M ≝
  22                            λlv,i. ⫯[l](lv i).
  23
  24 interpretation "alignment (model evaluation)"
  25    'UpSpoon M l lv = (valign M l lv).
  26
  27 (* Basic properties *********************************************************)
  28
  29 lemma valign_rw (M) (l) (lv): ∀i. (⫯{M}[l]lv) i = ⫯[l](lv i).
  30 // qed.