Presented By: Combinatorics Seminar - Department of Mathematics
Combinatorics Seminar --Stirling numbers for complex reflection groups
Bruce Sagan (Michigan State University)
NOTE UNUSUAL TIME. The ordinary Stirling numbers count set partitions and permutations of the set {1,2,...,n} by number of subsets and number of cycles, respectively. We show how to generalize these concepts to a complex reflection group. The ordinary Stirling numbers are recovered in type A. It turns out that often these Stirling numbers can be expressed in terms of elementary and homogeneous symmetric functions. We also make a connection with super coinvariant algebras. All terminology concerning Stirling numbers, symmetric functions, and complex reflection groups will be defined. This is joint work with Joshua Swanson.
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