## University COVID-19 update

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Please note: The University of Waterloo is closed for all events until further notice.

# Events by date

## Thursday, September 12, 2019

### Algebraic Graph Theory Seminar - Chris Godsil

Thursday, September 12, 2019 — 1:00 PM EDT

Title: Polynomial Spaces

Speaker: Chris Godsil Affiliation: University of Waterloo Room: MC 5417

Abstract:

We describe some simple machinery that enables us to derive upper bounds on the size of codes, and lower bounds on the size of designs in a quite general setting.

### Algebraic Combinatorics Seminar - Matthew Satriano

Thursday, September 12, 2019 — 3:30 PM EDT

Title: Combinatorial questions motivated by Invariant Theory

Speaker: Matthew Satriano Affiliation: University of Waterloo Room: MC 5417

Abstract:

We begin the talk by discussing a question in Invariant Theory: given a representation $V$ of a Lie group $G$, when if the invariant ring $k[V]^G$ a polynomial ring? We give a conjectural answer which we have verified for $SL_n$ and discuss some combinatorial questions motivated by the proof. This is joint work with Dan Edidin.

### September 2019

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