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 addition of already proven formula.
21 * <pre>
22 * A
23 * ------
24 * A
25 * </pre>
26 *
27 * @author Michael Meyling
28 */
29 public interface Add extends Reason {
30
31 /**
32 * Get reference to formula.
33 *
34 * @return Reference to previously proved formula.
35 */
36 public String getReference();
37
38 }
|