As of Version 10, most of the functionality of the Combinatorica package is built into the Wolfram System. >>

returns a Hasse diagram of the partially ordered set on integer partitions of n in which if dominates . The function takes two options: Type and VertexLabel, with default values Undirected and False, respectively. When Type is set to Directed, the function produces the underlying directed acyclic graph. When VertexLabel is set to True, labels are produced for the vertices.