matita/matita/contribs/lambdadelta/delayed_updating/substitution/path_dephi.ma

   1 (**************************************************************************)
   2 (*       ___                                                              *)
   3 (*      ||M||                                                             *)
   4 (*      ||A||       A project by Andrea Asperti                           *)
   5 (*      ||T||                                                             *)
   6 (*      ||I||       Developers:                                           *)
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   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/relocation/tr_pap.ma".
  16 include "delayed_updating/syntax/path.ma".
  17
  18 (* DEPHI FOR PATH ***********************************************************)
  19
  20 rec definition path_dephi (f) (p) on p ≝
  21 match p with
  22 [ list_empty     ⇒ 𝐞
  23 | list_lcons l q ⇒
  24    match l with
  25    [ label_node_d n ⇒ 𝗱❨f@❨n❩❩;path_dephi f q
  26    | label_edge_L   ⇒ 𝗟;path_dephi (𝟏⨮f) q
  27    | label_edge_A   ⇒ 𝗔;path_dephi f q
  28    | label_edge_S   ⇒ 𝗦;path_dephi f q
  29    ]
  30 ].