# Events

## Distinguished Lecture Series for Students – February 22

Elisabeta Marai, from the University of Illinois at Chicago’s Electronic Visualization Lab, will visit and give a broadly accessible talk, “Computer Graphics for Science,” at 5:15 pm on Wednesday, February 22, in Willamette 100. This is part of the Mathematics Department’s Distinguished Lectures for Students series. All are welcome, and undergraduates are especially encouraged to attend.

A poster with more details is available here: Poster

## Eugene Youth Math Festival

We invite all young students, who like math and share a passion for games, problem solving, and hands-on math activities, to come to our first math festival. This year we are able to offer free admission without prior registration. Please feel free to come and explore!

10:00 am – 1:00 pm, Saturday, February 18, 2017. Please see our poster for more details.

## AWM Student Chapter Distinguished Speaker

Monica Vazirani, Professor of Mathematics at University of California, Davis will visit campus on November 10th and 11th to deliver the fall 2016 AWM Student Chapter Distinguished Speaker Lectures.

Professor Vazirani will give a broadly accessible talk on Thursday, November 10th in Deady 106.

The title of this talk, which is suitable for undergraduates, is *Applications of symmetry via the lemma that is not Burnside’s*.

Professor Vazirani will give a colloquium talk on Friday, November 11th, at 4:00 pm in Deady 208. The title of this research-level talk, is *Representations of the affine BMW algebra*.

## Distinguished Lecture Series for Students – November 14th

Jayadev Athreya – Director the Washington Experimental Mathematics Lab, Associate Professor of Mathematics at the University of Washington, and co-creator of the project Axiomatic that blends math and art – will visit and give a broadly accessible talk (as part of the Mathematics Department’s Distinguished Lectures for Students series) at 5:15 pm on Monday, November 14 in Straub 245. All are welcome, and undergraduates are especially encouraged to attend.

A poster with more details is available here:

Poster

## AWM Distinguished Speaker

AWM Distinguished Lecture Series

Cristina Ballantine, Professor of Mathematics at College of the Holy Cross, will visit campus January 21 – 22, 2016.

Undergraduate Talk:

Thursday, Jan. 21st at 4pm in Deady 102

Title: Rolle’s Theorem for Polynomials over Finite Fields

Abstract: Rolle’s Theorem from calculus states that a differentiable function f that takes the same value at two different points must have a horizontal tangent line between them. As a consequence, between any two zeros of f there must be a zero of its derivative function f’.

Is this still true if f is a polynomial and the coefficients of f live in a world different from the real numbers? We will investigate what happens if this new world is a finite field (a finite set in which you can still perform operations similar to addition, subtraction, multiplication, and division).

No background beyond linear algebra is needed for this talk.

Colloquium Talk

Friday, Jan. 22nd at 4pm in Deady 208

Title: Graphs and Number Theory

Abstract: Graphs are the mathematical models for networks. Expander graphs are well-connected yet sparse graphs. The expansion property of a regular or bi-regular graph is governed by the second largest eigenvalue of its adjacency matrix. Optimal expanders are called Ramanujan graphs. We will introduce the notion of primes for graphs and define the Ihara-Zeta function and the Riemann Hypothesis in the context of graphs. Graphs satisfying the Riemann Hypothesis are Ramanujan. We will use methods from the representation theory of p-adic groups to construct infinite families of (regular and bi-regular) Ramanujan graphs.

## Distinguished Lecture Series for Undergraduates

Tim Chartier (Davidson College) will present a lecture on January 11, 2016 in 207 Chapman Hall at 5:15-6:15 pm as part of the Distinguished Lecture Series for Undergraduates.

Title: Playing from a Laptop: Sports Analytics

Abstract: Sports analytics is a growing field. The larger field of data analytics is exploding as a field requiring skills in mathematics and computer science. What sports projects can be tackled as an undergraduate? This talk will discuss a variety of projects Dr. Tim Chartier of Davidson College has directed with his students, who have ranged from first years to seniors and include math and non-math majors. His projects have varied from helping the German National Basketball Team to his own college teams. He’s also aided the NBA, NASCAR, and ESPN. Learn how to play a sport — as a sports analyst!

## AWM Distinguished Speaker

Angélica Osorno, an Assistant Professor at Reed College, will visit campus on November 12 – 13, 2015. She will present two lectures, one suitable for undergraduates and the second a colloquium for faculty and graduate students.

Undergraduate Lecture on November 12th at 4 p.m. in Condon 301

Title: Why Should We Care About Category Theory

Abstract: One of the first mathematical concepts we learn as children is counting, and when we do so, we think of counting the number of elements in a specific set. Soon after, we forget about sets and we just consider the abstract numbers themselves. This abstraction simplifies many things, but it also makes us forget about some structure that we had when we were thinking about sets. That structure can be encoded by a category. In this talk we will describe certain concepts in category theory, and you will realize that in most of your mathematics classes you have been working with categories, you just didn’t know about it. There will be plenty of examples that will show that category theory provides a unifying language for mathematics, and that many constructions are more naturally understood when they are seen through the categorical lens.

Colloquium on November 13th at 4 p.m. in Deady 208

Title: Why Do Algebraic Topologists Care About Categories

Abstract: The study of category theory was started by Eilenberg and MacLane, in their effort to codify the axioms for homology. Category theory provides a language to express the different structures that we see in topology, and in most of mathematics. Categories also play another role in algebraic topology. Via the classifying space construction, topologists use categories to build spaces whose topology encodes the algebraic structure of the category. This construction is a fruitful way of producing important examples of spaces used in algebraic topology. In this talk we will describe how this process works, starting from classic examples and ending with some recent work.

## Leahy Endowment Fund

A new fund, the Leahy Endowment Fund, has been created in honor of the long term department member, John Leahy, who passed away on January 29, 2015. The fund is “for the broad purpose of supporting mathematics graduate students” and it will remain open for contributions for about one year. Contributions should go to the UO Foundation “in memory of John Leahy.”

## Pacific Northwest Number Theory Conference

The University of Oregon is hosting the Pacific Northwest Number Theory Conference on May 16-17, 2015. For additional information, visit PNWNT Conference.

## Oregon Invitational Mathematics Tournament

The University of Oregon Mathematics Department is proud to host the Thirty-fifth annual Oregon Invitational Mathematics Tournament. Each year, the OIMT attracts the state’s best and brightest for a day of rigorous examination and mathematical discourse. For more information, please see http://blogs.uoregon.edu/oimt