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Universal | Line # 31 | 0 | 0 | - |
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1 | /* This file is part of the project "Hilbert II" - http://www.qedeq.org | |
2 | * | |
3 | * Copyright 2000-2013, Michael Meyling <mime@qedeq.org>. | |
4 | * | |
5 | * "Hilbert II" is free software; you can redistribute | |
6 | * it and/or modify it under the terms of the GNU General Public | |
7 | * License as published by the Free Software Foundation; either | |
8 | * version 2 of the License, or (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | package org.qedeq.kernel.se.base.module; | |
17 | ||
18 | import org.qedeq.kernel.se.base.list.Element; | |
19 | ||
20 | ||
21 | /** | |
22 | * Rule of universal generalization. | |
23 | * <pre> | |
24 | * A -> B(x) | |
25 | * ------------------- | |
26 | * A -> forall x B(x) | |
27 | * </pre> | |
28 | * | |
29 | * @author Michael Meyling | |
30 | */ | |
31 | public interface Universal extends Reason { | |
32 | ||
33 | /** | |
34 | * Get this reason. | |
35 | * | |
36 | * @return This reason. | |
37 | */ | |
38 | public Universal getUniversal(); | |
39 | /** | |
40 | * Get reference to formula. Usually this a formula of type A -> B(x) | |
41 | * | |
42 | * @return Reference to previously proved formula. | |
43 | */ | |
44 | public String getReference(); | |
45 | ||
46 | /** | |
47 | * Get free subject variable we want to quantify over. | |
48 | * | |
49 | * @return Free subject variable. | |
50 | */ | |
51 | public Element getSubjectVariable(); | |
52 | ||
53 | } |
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