![[MONOiD]](monoid.png)
Green classes are domains so all set theoretic functions for domains can be applied to them. Most of the set functions will work via default methods once the following methods have been implemented.
Size( class )
determines the size of Green class class.
Elements( class )
returns the set of all elements of the Green class class
obj in class
returns true if obj is a member of the Green class class and
false otherwise.
However, no generic methods are provided.
Version 2.4 (May 1998)