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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 "basic_2/grammar/lenv.ma".
16
17 (* SHIFT OF A CLOSURE *******************************************************)
18
19 let rec shift L T on L ≝ match L with
20 [ LAtom       ⇒ T
21 | LPair L I V ⇒ shift L (ⓑ{I} V. T)
22 ].
23
24 interpretation "shift (closure)" 'Append L T = (shift L T).