## University COVID-19 update

### Questions about buildings and services? Visit the list of Modified Services.

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

# Events

## Thursday, February 13, 2020

### Algebraic Graph Theory Seminar - Chris Godsil

Thursday, February 13, 2020 — 1:00 PM EST

Title: Moore Graphs

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

Abstract:

Moore graphs were introduced by Hoffman and Singleton in a fundamental paper. They can be defined as graphs with diameter $d$ and girth $2d+1$.

### Algebraic Combinatorics Seminar - Brian Chan

Thursday, February 13, 2020 — 2:30 PM EST

Title: A generalization of balanced tableaux and matching problems with unique solutions

Speaker: Brian Chan Affiliation: University of British Columbia Room: MC 5417

Abstract:

In this talk, we consider families of finite sets that we call shellable and that have been characterized by Chang and Hirst and Hughes as being the families of sets that admit unique solutions to Hall's matching problem.

### Graphs and Matroids Seminar - Matt Kroeker

Thursday, February 13, 2020 — 4:00 PM EST

Title: List Colouring and Ohba's Conjecture

Speaker: Matt Kroeker Affiliation: University of Waterloo Room: MC 5479

Abstract:

The question of when the list-chromatic number of a graph G, denoted chi_l(G), equals its chromatic number is fundamental to the theory of list colouring.

### February 2020

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