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 * Definition of function operator. This is a function constant. For example the function
21 * "x union y" or constants like the empty set.
22 *
23 * @author Michael Meyling
24 */
25 public interface FunctionDefinition extends NodeType {
26
27 /**
28 * Get number of arguments for the defined object. Carries information about the argument
29 * number the defined object needs.
30 *
31 * @return Argument number.
32 */
33 public String getArgumentNumber();
34
35 /**
36 * This name together with {@link #getArgumentNumber()} identifies a function.
37 *
38 * @return Name of defined function.
39 */
40 public String getName();
41
42 /**
43 * Get LaTeX output for definition. The replaceable arguments must are marked as "#1",
44 * "#2" and so on. For example "\mathfrak{M}(#1)"
45 *
46 * @return LaTeX pattern for definition type setting.
47 */
48 public String getLatexPattern();
49
50 /**
51 * Get defining formula for function constant. This might be for example:
52 * f(x, y) = {z | z \in x & z \in y}
53 * Such a formula must have the equal operator as first operator. The first operand must be
54 * the function with free (and pairwise different) subject variables as arguments.
55 *
56 * @return Defining formula for function constant.
57 */
58 public Formula getFormula();
59
60 /**
61 * Get description. Only necessary if formula is not self-explanatory.
62 *
63 * @return Description.
64 */
65 public LatexList getDescription();
66
67 }
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