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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 include "basics/core_notation.ma".
16
17 universe constraint Type[0] < Type[1].
18 universe constraint Type[1] < Type[2].
19 universe constraint Type[2] < Type[3].
20 universe constraint Type[3] < Type[4].
21
22 inductive True : Prop ≝ I : True.
23
24 (*lemma fa : ∀X:Prop.X → X.
25 #X #p //
26 qed.
27
28 (* check fa*)
29
30 lemma ggr ≝ fa.*)
31
32 inductive False : Prop ≝ .
33
34 inductive bool : Prop ≝ True : bool | false : bool.
35
36 inductive eq (A:Type[1]) (x:A) : A → Prop ≝
37     refl: eq A x x.
38
39 lemma provable_True : True → eq bool True True.
40