1 /* This file is part of the project "Hilbert II" - http://www.qedeq.org" target="alexandria_uri">http://www.qedeq.org 2 * 3 * Copyright 2000-2014, 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 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 this reason. 33 * 34 * @return This reason. 35 */ 36 public Add getAdd(); 37 38 /** 39 * Get reference to formula. 40 * 41 * @return Reference to previously proved formula. 42 */ 43 public String getReference(); 44 45 }