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 "basics/bool.ma".
16 include "ground/lib/relations.ma".
17 include "ground/notation/functions/no_0.ma".
18 include "ground/notation/functions/yes_0.ma".
20 (* BOOLEANS *****************************************************************)
30 (* Advanced constructions ***************************************************)
32 lemma eq_bool_dec (b1:bool) (b2:bool):
34 * * /2 width=1 by or_introl/
35 @or_intror #H destruct