Geller Lecture

Date: April 10, 2025

Time: 6:00PM - 7:00PM

Location: Bloc 166

Speaker: Victor Reiner, University of Minnesota

Title: Counting and cyclic symmetry

Abstract: Part of combinatorics looks for nice formulas to count various objects. Sometimes these formulas hide an added surprise: when we introduce a variable to turn them into a polynomial, they count the objects with cyclic symmetry, after plugging in a complex root-of-unity for the variable! We will illustrate this with some of our favorite examples, including some that we still find mysterious.

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