## 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** for information on our response to the pandemic.

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

Wednesday, July 15, 2020 — 9:30 AM EDT

**Ertan Elma, Department of Pure Mathematics, University of Waterloo**

"Some Problems in Multiplicative and Additive Number Theory"

Online

Tuesday, July 14, 2020 — 1:00 PM EDT

**Sam Kim, Department of Pure Mathematics, University of Waterloo**

"Operator Systems, Crossed Products, and Correlation Sets"

Friday, July 10, 2020 — 2:30 PM EDT

**Jason Lotay, University of Oxford**

"Lagrangian mean curvature flow and the Gibbons-Hawking ansatz"

Wednesday, June 10, 2020 — 4:15 PM EDT

**Shima Bab Hadiashar, Department of Combinatorics & Optimization, University of Waterloo**

"Quantum PAC-Learning"

Friday, May 29, 2020 — 2:30 PM EDT

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

"Towards higher dimensional Gromov compactness in $G_2$ and $\mathrm{Spin}(7)$ manifolds"

Thursday, May 28, 2020 — 1:30 PM EDT

**Luke MacLean, Department of Pure Mathematics, University of Waterloo**

"The Fundamentals of Computability Theory"

Tuesday, May 5, 2020 — 1:00 PM EDT

**Shubham Dwivedi, Department of Pure Mathematics, University of Waterloo**

"Topics in G_2 geometry and geometric flows"

Friday, March 13, 2020 — 3:03 PM EDT

**Ken Davidson, Department of Pure Mathematics, University of Waterloo**

"Interpolation and duality in algebras of multipliers"

Wednesday, March 11, 2020 — 2:30 PM EDT

**Rahim Moosa, Department of Pure Mathematics, University of Waterloo**

"Dynamics on the Berkovich line II"

I will continue to discuss how algebraic dynamics on the affine or projective line extend to the Berkovich line. My aim is still Theorem 4.7 of Jonsson's notes.

MC 5403

Tuesday, March 10, 2020 — 2:30 PM EDT

**Hongdi Huang, Department of Pure Mathematics, University of Waterloo**

"On Hopf Ore Extensions and Zariski Cancellation Problems"

Tuesday, March 10, 2020 — 2:00 PM EDT

**Luke MacLean, Department of Pure Mathematics, University of Waterloo**

"Kleene's $\mathcal{O}$"

A computable ordinal is one that corresponds to the order type of some computable linear well ordering. It can be shown that these are a subset of the countable ordinals, but there is still an issue on how to name these ordinals. We would like a system of notation that allows us to compare two arbitrary ordinals.

Tuesday, March 10, 2020 — 1:30 PM EDT

**Siddhi Pathak, Penn State University**

"Convolution of values of the Lerch zeta-function"

Tuesday, March 10, 2020 — 10:30 AM EDT

**Christopher Hawthorne & Wilson Poulter, Department of Pure Mathematics, University of Waterloo**

"NIP XIV"

We continue section 4.2 of Simon's Guide to NIP theories.

MC 5479

Tuesday, March 10, 2020 — 10:00 AM EDT

**Ben Anderson-Sackaney, Department of Pure Mathematics, University of Waterloo**

We will begin discussing Frobenius algebras.

MC 5417

Monday, March 9, 2020 — 4:00 PM EDT

**Andrew Putman, University of Notre Dame**

"The topology of the moduli space of curves"

The moduli space of curves is a remarkable space with connections to algebraic geometry, complex analysis, differential geometry, and low-dimensional topology. I'll give an elementary introduction to it and discuss some recent work on its topology.

MC 5501

Friday, March 6, 2020 — 3:30 PM EST

**Hayley Reid, Department of Pure Mathematics, University of Waterloo**

"The Law of Quadratic Reciprocity"

Friday, March 6, 2020 — 3:00 PM EST

**Gavin Ball, Université du Québec à Montréal and Centre de recherches mathématiques**

**"**Closed G2-structures inducing a conformally flat metric"

Wednesday, March 4, 2020 — 2:30 PM EST

**Rahim Moosa, Department of Pure Mathematics, University of Waterloo**

"Dynamics on the Berkovich line"

I will discuss how algebraic dynamics on the affine or projective line extend to the Berkovich line. My aim is Theorem 4.7 of Jonsson's notes.

MC 5403

Tuesday, March 3, 2020 — 2:00 PM EST

Luke MacLean, Department of Pure Mathematics, University of Waterloo

"Kleene's $\mathcal{O}$"

Kleene's $\mathcal{O}$ is a system for ordinal notation used in computability theory that relates the concepts of constructive and computable ordinals. This notation allows one to unambiguously perform transfinite induction on ordinals by ensuring that there is a unique representation for each ordinal.

We will prove some properties about the notation system and show that there are ordinals which are not computable.

MC 5413

Tuesday, March 3, 2020 — 1:30 PM EST

**Sacha Mangarel, Centre de Recherches Mathématiques**

"On Low Discrepancy Multiplicative Sequences"

Tuesday, March 3, 2020 — 10:30 AM EST

**Wilson Poulter, Department of Pure Mathematics, University of Waterloo**

"NIP XIII"

We continue section 4.1 of Simon's Guide to NIP theories.

MC 5479

Tuesday, March 3, 2020 — 10:00 AM EST

**Hongdi Huang, Department of Pure Mathematics, University of Waterloo**

In the half part, we will complete the leftover on the generators and relations. Then we will setup for Frobenius algebras. Finally, we will go-ahead to the algebra structure.

MC 5417

Monday, March 2, 2020 — 4:00 PM EST

**Ilan Hirshberg, Ben Gurion University of the Negev**

"Mean dimension and radius of comparison"

Friday, February 28, 2020 — 3:30 PM EST

**Alex Rutar, Department of Pure Mathematics, University of Waterloo**

"Geometric and Combinatorial Separation Conditions for Iterated Function Systems"

Friday, February 28, 2020 — 3:00 PM EST

**Michael Klug, University of California Berkeley**

"Concordance of homotopic spheres in 4-manifolds"

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