====== Ed Swartz (Cornell) ====== ====== Three Complexes ====== ===== Abstract for the Combinatorics and Geometry and Topology Seminars 2008 September 23 ===== I will examine the enumerative properties of three simplicial complexes associated to matroids: the independence complex of a matroid, the broken circuit complex of a matroid, and the order complex of a geometric lattice. ----