| relation | The abstract class for FSet relations. It is a structure class. | 
|---|
| wb-2-relation | A class of functional binary relations represented as pairs of weight- balanced binary trees. Th... | 
|---|
| arity | Returns the arity of the relation rel. | 
|---|---|
| closure | The transitive closure of the set over the relation.  The relation may also be supplied as a func... | 
| convert | Converts the collection to the specified type.  Some methods may take additional keyword argument... | 
| compare | Returns one of :less,:greater,:equal, or:unequalaccording asxis less than, greate... | 
|---|