RingI


1   /* @author rich
2    * Created on 05-Mar-2004
3    *
4    * This code is covered by a Creative Commons
5    * Attribution, Non Commercial, Share Alike license
6    * <a HREF="http://creativecommons.org/licenses/by-nc-sa/1.0">License</a>
7    */
8   package org.lsmp.djep.groupJep.interfaces;
9   
10  /**
11   * Defines the operations on a ring, i.e. an abelian group
12   * under + with a closed * operator and * distributitive over +.
13   * 
14   * @author Rich Morris
15   * Created on 05-Mar-2004
16   */
17  public interface RingI extends AbelianGroupI {
18      /** Returns the product of two numbers, a*b */
19      public Number   mul(Number   a,Number   b);
20      /** Get multiplicative identity i.e. 1.
21       * Strictly speaking a ring need not have a mul indentity.
22       * However most useful ones do, and they are not
23       * all integral domains. */
24      public Number   getONE();
25  
26  }
27

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