## Contact Info

Pure MathematicsUniversity of Waterloo

200 University Avenue West

Waterloo, Ontario, Canada

N2L 3G1

Departmental office: MC 5304

Phone: 519 888 4567 x33484

Fax: 519 725 0160

Email: puremath@uwaterloo.ca

Visit our COVID-19 information website to learn how Warriors protect Warriors.

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

Wednesday, June 23, 2021 — 12:00 PM EDT

**Sean Fitzpatrick, University of Lethbridge**

"How using OER made me a better teacher"

I began working with open educational resources (OER) not long after my arrival at the University of Lethbridge. There were two immediate appeals: affordability (I could provide a textbook to students at no cost) and adaptability (I could edit the source to get the textbook I wanted). When the only commercial textbook we could find for a new course was over $300, I knew it was time to consider OER.

Wednesday, June 23, 2021 — 9:00 AM EDT

**Nolan Pyott, Department of Pure Mathematics, University of Waterloo**

"Counting Irreducible Polynomials with the Turán Sieve"

Monday, June 21, 2021 — 2:30 PM EDT

**Ping Zhong, University of Wyoming**

The Brown measure was introduced by L.G. Brown in 1983. It is a generalized notion of spectral measure which applies to non-normal operators living in a suitable non-commutative probability framework -- the framework of a so-called W*-probability space. The purpose of this learning seminar is to provide an accessible entry point to the notion of Brown measure, with an eye towards becoming able to do calculations of Brown measures in examples which come from free probability.

Monday, June 21, 2021 — 11:00 AM EDT

**Sean Monahan, Department of Pure Mathematics, University of Waterloo**

"An introduction to toric varieties"

Toric varieties are a special kind of variety equipped with a group action from an algebraic torus. These varieties are very nice to work with because they have a combinatorial interpretation involving polyhedral geometry. I will (very quickly) introduce toric varieties and focus on some concrete examples.

The seminar will meet on Zoom.

Meeting ID: 811 2094 8164

Passcode: 033003

Thursday, June 17, 2021 — 1:30 PM EDT

**Katarina Spasojevic, USRA, Department of Pure Mathematics, University of Waterloo**

Wednesday, June 16, 2021 — 11:00 AM EDT

**Spiro Karigiannis, Department of Pure Mathematics, University of Waterloo**

Last time we reviewed the classical decomposition of the Riemann curvature tensor into scalar, traceless Ricci, and Weyl curvature. This time we will examine special features in dimensions 3 and 4. Then I will consider the more general case of a metric compatible connection with torsion, and see how this decomposition generalizes.

Thursday, June 10, 2021 — 4:00 PM EDT

**Shayla Redlin, Department of Combinatorics & Optimization, University of Waterloo**

"Counting Antichains in the Boolean Lattice"

Wednesday, June 9, 2021 — 12:00 PM EDT

**Jason Siefken, University of Toronto**

"Onboarding Instructors to an Active Learning Class"

Wednesday, June 9, 2021 — 9:00 AM EDT

**Shuo Gao, Department of Pure Mathematics, University of Waterloo**

"Introduction to Elementary Sieve"

This talk aims at introducing sieve theory in an elementary way. Sieve problem and two elementary sieves - larger sieve and square sieve - will be discussed in detail, as well as their applications and a broad overview of the historical development of sieve theory. Some standard results including the Mobius inversion formula will also be covered in this talk to make the proof self-contained.

Wednesday, June 2, 2021 — 11:00 AM EDT

**Spiro Karigiannis, Department of Pure Mathematics, University of Waterloo**

"Decomposition of curvature tensor for metrics with torsion"

I will first review the classical decomposition of the Riemann curvature tensor into scalar, traceless Ricci, and Weyl curvature, with an emphasis on special features in dimensions 3 and 4. Then I will consider the more general case of a metric compatible connection with torsion, and see how this decomposition generalizes.

Wednesday, May 12, 2021 — 11:00 AM EDT

**Shengda Hu, Wilfrid Laurier University**

"Some computations for connections in generalized geometry"

We look at generalized connections on a Riemannian manifold. We will consider curvature in generalized geometry and look to extend classical computations to the generalized situation.

Zoom meeting: contact Spiro Karigiannis (karigiannis@uwaterloo.ca) or Ragini Singhal (r4singha@uwaterloo.ca) for link.

Wednesday, April 21, 2021 — 11:00 AM EDT

**Da Rong Cheng, Department of Pure Mathematics, University of Waterloo**

"Non-minimizing solutions to the Ginzburg-Landau equations (Part 2)"

Wednesday, April 7, 2021 — 11:00 AM EDT

**Da Rong Cheng, Department of Pure Mathematics, University of Waterloo**

"Non-minimizing solutions to the Ginzburg-Landau equations"

Monday, April 5, 2021 — 4:00 PM EDT

**Michael Pinsker, Technische Universität Wien / Charles University Prague**

"Algebraic, logical, and combinatorial methods for Constraint Satisfaction Problems"

Thursday, April 1, 2021 — 4:00 PM EDT

**Sean Monahan, Department of Pure Mathematics, University of Waterloo**

Monday, March 29, 2021 — 4:00 PM EDT

**Linda Westrick, Pennsylvania State University**

"Luzin's (N) and randomness reflection"

Monday, March 29, 2021 — 1:30 PM EDT

We’re starting up an arithmetic geometry seminar, online, and we’d like to include anyone who wants to participate. The starting point will be the book by Hindry and Silverman on Diophantine Geometry, but we may quickly diverge into other directions. I don’t expect this to be the regular meeting time – the most important part of the first meeting will be to decide on a regular meeting time. So if you can’t make it to the organizational meeting, please email David McKinnon to say what your scheduling constraints are.

Friday, March 26, 2021 — 2:30 PM EDT

**Oğuz Şavk, Bogaziçi University**

"Classical and new plumbings bounding contractible manifolds and homology balls"

A central problem in low-dimensional topology asks which homology 3-spheres bound contractible 4-manifolds and homology 4-balls. In this talk, we address this problem for plumbed 3-manifolds and we present the classical and new results together. Our approach is based on Mazur’s famous argument which provides a unification of all results in a fairly simple way.

Wednesday, March 24, 2021 — 11:00 AM EDT

**Christopher Lang, Department of Pure Mathematics, University of Waterloo**

"On the charge density and asymptotic tail of a monopole"

Monday, March 22, 2021 — 4:00 PM EDT

**Guillaume Aubrun, Université Claude Bernard Lyon 1**

"Entangleability of cones"

Thursday, March 18, 2021 — 1:30 PM EDT

**Arundhathi Krishnan, Department of Pure Mathematics, University of Waterloo**

We will continue our discussion about monoids presented by generators and relations. What comes next is to look at the notion of normal form for an element in such a monoid, and at how normal forms can be used to prove the cancellativity property.

Zoom meeting:

- Meeting ID: 935 3963 3379
- Passcode: 339014

Wednesday, March 17, 2021 — 2:00 PM EDT

**Marco Handa, Department of Pure Mathematics, University of Waterloo**

"Internality in stable theories"

Thursday, March 11, 2021 — 1:30 PM EST

**Arundhathi Krishnan, Department of Pure Mathematics, University of Waterloo**

Wednesday, March 10, 2021 — 11:00 AM EST

**Anton Iliashenko, Department of Pure Mathematics, University of Waterloo**

"Harmonic Mappings"

Thursday, March 4, 2021 — 1:30 PM EST

**Arundhathi Krishnan, Pure Mathematics, University of Waterloo**

University of Waterloo

200 University Avenue West

Waterloo, Ontario, Canada

N2L 3G1

Departmental office: MC 5304

Phone: 519 888 4567 x33484

Fax: 519 725 0160

Email: puremath@uwaterloo.ca

University of Waterloo

University of Waterloo

43.471468

-80.544205

200 University Avenue West

Waterloo,
ON,
Canada
N2L 3G1

The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land granted to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is centralized within our Indigenous Initiatives Office.