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### Distinguishing chambers of the moment polytope

**Algebra & Discrete Mathematics**

Speaker: | Tara Holm, UC Berkeley |

Location: | 693 Kerr |

Start time: | Fri, Nov 21 2003, 2:10PM |

I will discuss a problem that lies in the intersection of symplectic geometry and combinatorics. Given a compact symplectic manifold equipped with a Hamiltonian torus action, we can define a convex polytope called the moment polytope. This polytope has internal structure, and some interesting combinatorial questions include determining the number of chambers inside the moment polytope, and finding a way to distinguish the chambers. I will discuss some of the symplectic geometry and lots of the combinatorics involved in the answers to these questions.