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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 set "baseuri" "cic:/matita/tests/contradiction".
16 alias id "True" = "cic:/Coq/Init/Logic/True.ind#xpointer(1/1)".
17 alias id "not" = "cic:/Coq/Init/Logic/not.con".
18 alias num (instance 0) = "natural number".
19 alias symbol "eq" (instance 0) = "leibnitz's equality".
20
21
22
23 theorem stupid: \forall a:Prop. a \to not a \to 0 = 2.
24 intros.
25 letin H \def (H1 H).
26 contradiction.
27 qed.
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