**Upcoming talks**

*September 28th*

Speaker: Soffia Arnadottir

Affiliation: University of Waterloo

Title: Strongly cospectral vertices, Cayley graphs and other things

Abstract: In this talk we will look at a connection between the number of pairwise strongly cospectral vertices in a translation graph (a Cayley graph of an abelian group) and the multiplicities of its eigenvalues. We will use this connection to give an upper bound on the number of pairwise strongly cospectral vertices in cubelike graphs.

*October 5th *

Speaker: Brendan Rooney

*October 12th *

No seminar. Happy Thanksgiving!

*October 19th *

Speaker: Christopher van Bommel

Youtube playlist with all talks

**Previous talks**

12. Paul Terwilliger – Leonard pairs, spin models, and distance-regular graphs.

11. Andriaherimanana Sarobidy Razafimahatratra – 2-intersecting families of permutations.

Viw the slides for the talk here.

Mahsa Nasrollahi Shirazi – Erdös-Ko-Rado theorem for 2-intersecting families of perfect matchings

Viw the slides for the talk here.

10. Eric Moorhouse – Projective Planes, Finite and Infinite

View slides for this talk here.

9. William J. Martin – Scaffolds

View slides for this talk here.

8. Bobae Johnson, August Liu, Malena Schmidt & Neo Yin – Laplacian Quantum Fractional Revival On Graphs

View slides for this talk here.

7. Gabriel Coutinho – State transfer and the size of the graph

View slides for this talk here.

6. David Roberson – What do graph planarity and homomorphism counts have to do with quantum mechanics?

View slides for this talk here.

Watch this talk here.

5. Harmony Zhan – Decomposing discrete quantum walks into continuous quantum walks

View slides for this talk here.

Watch this talk here.

4. Chris Godsil – Continuous Quantum Walks on Graphs

View slides for this talk here.

Watch this talk here.

3. Karen Meagher – Group Theory and the Erdős-Ko-Rado (EKR) Theorem

Watch this talk here.

2. Sebi Cioaba – Flip graph on perfect matchings of complete graphs and sign reversal graphs

Watch this talk here.

1. Max Levit – A covering graph perspective on Huang’s theorem

View slides for this talk here.

Watch this talk here.