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 "redex_pointer.ma".
17 (* REDEX POINTER SEQUENCE ***************************************************)
19 (* Policy: pointer sequence metavariables: r, s *)
21 definition rpseq: Type[0] \def list rptr.
23 (* Note: a "spine" computation contracts just redexes in the spine *)
24 definition is_spine: predicate rpseq ≝ λs.
27 (* Note: to us, a "normal" computation contracts redexes in non-decreasing positions *)
28 definition is_le: predicate rpseq ≝ λs.
31 (* Note: a normal spine computation *)
32 definition is_spine_le: predicate rpseq ≝ λs.