Acyclic orientations and excedence permutations

    Stephanie van Willigenburg, (UBC)

Abstract: The cardinality of a set of certain directed bipartite graphs is
equal to that of a set of permutations that satisfy certain criteria. In this
talk we decribe both the set of graphs and the set of permutations, what
their cardinality has to do with the chromatic polynomial, and whether we can
find a natural bijection between the sets.

This is joint work with Richard Ehrenborg.