1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
15 include "ground_2/lib/functions.ma".
16 include "ground_2/lib/exteq.ma".
17 include "apps_2/models/model.ma".
19 (* MODEL ********************************************************************)
21 definition valign (M) (l): evaluation M → evaluation M ≝
24 interpretation "alignment (model evaluation)"
25 'UpSpoon M l lv = (valign M l lv).
27 (* Basic properties *********************************************************)
29 lemma valign_rw (M) (l) (lv): ∀i. (⫯{M}[l]lv) i = ⫯[l](lv i).