helm/matita/library/datatypes/compare.ma

   1 (**************************************************************************)
   2 (*       ___                                                                *)
   3 (*      ||M||                                                             *)
   4 (*      ||A||       A project by Andrea Asperti                           *)
   5 (*      ||T||                                                             *)
   6 (*      ||I||       Developers:                                           *)
   7 (*      ||T||       A.Asperti, C.Sacerdoti Coen,                          *)
   8 (*      ||A||       E.Tassi, S.Zacchiroli                                 *)
   9 (*      \   /                                                             *)
  10 (*       \ /        This file is distributed under the terms of the       *)
  11 (*        v         GNU Lesser General Public License Version 2.1         *)
  12 (*                                                                        *)
  13 (**************************************************************************)
  14
  15 set "baseuri" "cic:/matita/datatypes/compare/".
  16
  17 inductive compare :Set \def
  18 | LT : compare
  19 | EQ : compare
  20 | GT : compare.
  21
  22 definition compare_invert: compare \to compare \def
  23   \lambda c.
  24     match c with
  25       [ LT \Rightarrow GT
  26       | EQ \Rightarrow EQ
  27       | GT \Rightarrow LT ].