# discrete CATS seminar

Date:

11/09/2020 - 2:00pm to 3:00pm

Location:

Zoom

Speaker(s) / Presenter(s):

Richard Ehrenborg (University of Kentucky)

**Title**: Three combinatorial applications

**Abstract:**This is not one seminar talk. This is three small seminars. First, we prove a geometric result of Dirichlet using combinatorics. Second, as an application of posets we obtain Sylvester's two coin result. Finally, we present a counting proof when 2 is a quadratic residue in a finite field.

The third topic is joint work with Frits Beukers and Karthik Chandrasekhar.

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