# Events by date

## Monday, July 19, 2021

### Algebraic Graph Theory Seminar - Michael Tait

Monday, July 19, 2021 — 11:30 to 11:30 AM EDT

Title: Two conjectures on the spread of graphs

Speaker: Michael Tait Affiliation: Villanova University Zoom: Contact Soffia Arnadottir

Abstract:

Given a graph $G$ let $\lambda_1$ and $\lambda_n$ be the maximum and minimum eigenvalues of its adjacency matrix and define the spread of $G$ to be $\lambda_1 - \lambda_n$. In this talk we discuss solutions to a pair of 20 year old conjectures of Gregory, Hershkowitz, and Kirkland regarding the spread of graphs.

### Special SIAM Annual Meeting Session

Monday, July 19, 2021 — 4:15 PM EDT

Title: In Memoriam: Tom Coleman’s Contributions to Applied Mathematics and Optimization

Speaker: Yuying Li, Stephen Wright, Alex Pothen, Bruce Hendrickson, Peter Forsyth, and Somayeh Moazeni Affiliation: SIAM Annual Meeting (AN21) Registration: https://www.siam.org/conferences/cm/conference/an21

Description

### Special SIAM Session - In Memoriam: Tom Coleman’s Contributions to Applied Mathematics and Optimization

Monday, July 19, 2021 — 4:15 PM EDT

Title: In Memoriam: Tom Coleman’s Contributions to Applied Mathematics and Optimization

Speakers:

Yuying Li, Stephen Wright, Alex Pothen, Bruce Hendrickson, Peter Forsyth, and Somayeh Moazeni

Affiliation:

SIAM Annual Meeting (AN21)

Registration: https://www.siam.org/conferences/cm/conference/an21

Description:

Thomas F. Coleman—a leader in optimization and scientific computing, professor at the University of Waterloo, and a SIAM Fellow—passed away on April 20, 2021. Tom served as the Director of the Theory Center at Cornell and then as Dean of the Faculty of Mathematics at the University of Waterloo. His research spanned continuous optimization, combinatorial scientific computing, automatic differentiation, financial optimization, mathematical software, etc. In this session, his wife and collaborator, Yuying Li, and five of his students and colleagues will describe the pioneering contributions that Tom made to these fields in his research.

### August 2021

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