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.bo.logic.common;
17
18 /**
19 * Logical and term operators. These strings might occur as values for
20 * {@link org.qedeq.kernel.se.base.list.ElementList#getOperator()}.
21 *
22 * @author Michael Meyling
23 */
24 public interface Operators {
25
26 /** Operator string for logical "and". */
27 public static final String CONJUNCTION_OPERATOR = "AND";
28
29 /** Operator string for logical "or". */
30 public static final String DISJUNCTION_OPERATOR = "OR";
31
32 /** Operator string for logical implication. */
33 public static final String IMPLICATION_OPERATOR = "IMPL";
34
35 /** Operator string for logical equivalence. */
36 public static final String EQUIVALENCE_OPERATOR = "EQUI";
37
38 /** Operator string for logical negation. */
39 public static final String NEGATION_OPERATOR = "NOT";
40
41 /** Operator string for logical "all" operator. */
42 public static final String UNIVERSAL_QUANTIFIER_OPERATOR = "FORALL";
43
44 /** Operator string for logical "exists" operator. */
45 public static final String EXISTENTIAL_QUANTIFIER_OPERATOR = "EXISTS";
46
47 /** Operator string for logical "exists unique" operator. */
48 public static final String UNIQUE_EXISTENTIAL_QUANTIFIER_OPERATOR = "EXISTSU";
49
50 /** Operator string for predicate constants. */
51 public static final String PREDICATE_CONSTANT = "PREDCON";
52
53 /** Operator string for predicate variables. */
54 public static final String PREDICATE_VARIABLE = "PREDVAR";
55
56 /** Operator string for subject variables. */
57 public static final String SUBJECT_VARIABLE = "VAR";
58
59 /** Operator string for function constants. */
60 public static final String FUNCTION_CONSTANT = "FUNCON";
61
62 /** Operator string for function constants. */
63 public static final String FUNCTION_VARIABLE = "FUNVAR";
64
65 /** Operator string for class operator. */
66 public static final String CLASS_OP = "CLASS";
67
68 /** Operator string for meta variables. */
69 public static final String META_VARIABLE = "METAVAR";
70
71 }
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