# Events - 2020

Thursday, October 1, 2020 — 4:00 PM EDT

Daniel Perales Anaya, Department of Pure Mathematics, University of Waterloo

"Free Probability and Non-crossing Partitions"

Wednesday, September 30, 2020 — 2:30 PM EDT

## Algebra Seminar

Seda Albayrak, Department of Pure Mathematics, University of Waterloo

"A Strong version of Cobham’s theorem"

Friday, September 25, 2020 — 2:30 PM EDT

## Geometry & Topology Seminar

Michael Albanese, UQAM

"Almost Complex Structures on Rational Homology Spheres"

Friday, September 18, 2020 — 2:30 PM EDT

## Geometry & Topology Seminar

Chao Li, Princeton University

"Geometric comparison theorems for scalar curvature lower bounds"

Monday, August 10, 2020 — 1:30 PM EDT

## PhD Thesis Defence

Zsolt Tanko, Department of Pure Mathematics, University of Waterloo

"Coefficient spaces arising from locally compact groups"

Wednesday, July 22, 2020 — 4:30 PM EDT

Adam Humeniuk, Department of Pure Mathematics, University of Waterloo

"Generatingfunctionology: basics and approximation"

A generating function is a device for studying a sequence by trapping it in the coefficients of a power series. I'll give a brief crash course on "generatingfunctionology", and show you how to write down the generating function of Fibonacci numbers. This gives, for instance, an exact formula for the nth Fibonacci number. We don’t usually care whether the series converges, and work in the setting of “formal” power series.

Tuesday, July 21, 2020 — 10:00 AM EDT

## PhD Thesis Defence

Ehsaan Hossain, Department of Pure Mathematics, University of Waterloo

"Recurrence in Algebraic Dynamics"

Let $\varphi:X\dashrightarrow X$ is a rational mapping of an algebraic variety $X$ defined over $\C$. The orbit of a point $x\in X$ is the sequence $\{x,\varphi(x),\varphi^2(x),\ldots\}$. Our basic question is: how often does this orbit intersect a given closed set $C$? Thus we are interested in the return set

$E := \{n\geq 0 : \varphi^n(x)\in C\}.$

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

## PhD Thesis Defence

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

## PhD Thesis Defence

Sam Kim, Department of Pure Mathematics, University of Waterloo

"Operator Systems, Crossed Products, and Correlation Sets"

Friday, July 10, 2020 — 2:30 PM EDT

## Geometry & Topology Seminar

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

## Geometry & Topology Seminar

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

## PhD Thesis Defence

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

## Analysis Seminar

Ken Davidson, Department of Pure Mathematics, University of Waterloo

"Interpolation and duality in algebras of multipliers"

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

## Valuative Tree Seminar

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

## Algebra Seminar

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

## Computability Learning Seminar

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

## Number Theory Seminar

Siddhi Pathak, Penn State University

"Convolution of values of the Lerch zeta-function"

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

## Model Theory Learning Seminar

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

## Frobenius Algebras and TQFT Learning Seminar

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

## Colloquium

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

Friday, March 6, 2020 — 3:00 PM EST

## Geometry & Topology Seminar

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

## Valuative Tree Seminar

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

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