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### Eulerian numbers, chromatic quasisymmetric functions and Hessenberg varieties

**Algebra & Discrete Mathematics**

Speaker: | Michelle Wachs, University of Miami/UC Berkeley |

Location: | 1147 MSB |

Start time: | Mon, Nov 25 2013, 11:00AM |

We consider three distinct topics of independent interest; one in enumerative combinatorics, one in symmetric function theory, and one in algebraic geometry. The topic in enumerative combinatorics concerns a q-analog of a generalization of the Eulerian numbers, the one in symmetric function theory deals with a refinement of Stanley's chromatic symmetric functions, and the one in algebraic geometry deals with a representation of the symmetric group on the cohomology of the regular semisimple Hessenberg variety of type A. Our purpose is to explore some connections between these topics and consequences of these connections. This talk is based on joint work with John Shareshian.