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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 | * Wraps a formula. Such an object is build out of | |
22 | * {@link org.qedeq.kernel.se.base.list.Element}s. | |
23 | * | |
24 | * @author Michael Meyling | |
25 | */ | |
26 | public interface Formula { | |
27 | ||
28 | /** | |
29 | * Get formula or term. | |
30 | * | |
31 | * @return Word that should be a formula. | |
32 | */ | |
33 | public Element getElement(); | |
34 | } |
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