01 /* This file is part of the project "Hilbert II" - http://www.qedeq.org
02 *
03 * Copyright 2000-2011, Michael Meyling <mime@qedeq.org>.
04 *
05 * "Hilbert II" is free software; you can redistribute
06 * it and/or modify it under the terms of the GNU General Public
07 * License as published by the Free Software Foundation; either
08 * version 2 of the License, or (at your option) any later version.
09 *
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
19 /**
20 * Usage of Modus Ponens.
21 * <pre>
22 * A -> B
23 * A
24 * ------
25 * B
26 * </pre>
27 *
28 * @author Michael Meyling
29 */
30 public interface ModusPonens extends Reason {
31
32 /**
33 * Get reference to formula. Usually this a formula of type A -> B
34 *
35 * @return Reference to previously proved formula.
36 */
37 public String getReference1();
38
39 /**
40 * Get reference to formula. Usually this a formula of type A
41 *
42 * @return Reference to previously proved formula.
43 */
44 public String getReference2();
45
46 }
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