## University COVID-19 update

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

# Events - 2020

Thursday, December 3, 2020 — 4:00 PM EST

Mani Thamizhazhagan, Department of Pure Mathematics, University of Waterloo

"On the interplay of harmonic analysis, combinatorics, additive number theory and ergodic theory"

Thursday, December 3, 2020 — 1:00 PM EST

## Special Colloquium

Elana Kalashnikov, Harvard University

"Quiver flag varieties and mirror symmetry"

Tuesday, December 1, 2020 — 1:00 PM EST

## Special Colloquium

Junliang Shen, MIT

"The P=W conjecture and hyper-Kähler geometry"

The P=W conjecture by de Cataldo, Hausel, and Migliorini suggests a surprising connection between the topology of Hitchin systems and Hodge theory of character varieties. In this talk, we will focus on interactions between topology of Lagrangian fibrations and Hodge theory in general hyper-Kaehler geometries. Such connections shed new light on both the P=W conjecture for Hitchin systems and the Lagrangian base conjecture for compact hyper-Kähler manifolds.

Monday, November 30, 2020 — 4:00 PM EST

## Pure Math Colloquium

Jonathan Zhu, Princeton

"Mean curvature flow and explicit Łojasiewicz inequalities"

Friday, November 27, 2020 — 2:30 PM EST

## Geometry & Topology Seminar

Brady Ali Medina, Department of Pure Mathematics, University of Waterloo

"A different way to generalize the Weierstrass semigroup"

Friday, November 27, 2020 — 1:00 PM EST

## Special Colloquium

Michael Brannan, Texas A&M University

"Quantum symmetries of graphs"

Thursday, November 26, 2020 — 4:00 PM EST

Caleb Suan, Department of Pure Mathematics, University of Waterloo

"Intro to Knots and Knot Invariants"

Thursday, November 26, 2020 — 1:00 PM EST

## Special Colloquium

Lei Alice Chen, California Institute of Technology

"Actions of Homeo and Diffeo groups on manifolds"

In this talk, I discuss the general question of how to obstruct and construct group actions on manifolds. I will focus on large groups like Homeo(M) and Diff(M) about how they can act on another manifold N. The main result is an orbit classification theorem, which fully classifies possible orbits. I will also talk about some low dimensional applications and open questions. This is a joint work with Kathryn Mann.

Wednesday, November 25, 2020 — 2:30 PM EST

## Algebra Seminar

Yifeng Huang, University of Michigan - Ann Arbor

"A generating function for counting mutually annihilating matrices over a finite field"

Monday, November 23, 2020 — 4:00 PM EST

## Pure Math Colloquium

Gigliola Staffilani, MIT

"The many faces of dispersive equations"

Friday, November 20, 2020 — 2:30 PM EST

## Geometry & Topology Seminar

Ákos Nagy, University of California Santa Barbara

"The asymptotic geometry of G_2-monopoles"

Wednesday, November 18, 2020 — 10:00 AM EST

## PhD Thesis Defence

Seda Albayrak, Department of Pure Mathematics, University of Waterloo

"Sparse Automatic Sets"

I will present results in the theory of sparse automatic sets in three different contexts: the theory of algebraic power series, unlikely intersections, and the theory of representations in additive bases.

Online

Friday, November 13, 2020 — 2:30 PM EST

## Geometry & Topology Seminar

Joe Driscoll, University of Leeds

"Deformations of Asymptotically Conical G2-Instantons"

Tuesday, November 3, 2020 — 11:00 AM EST

## Faculty of Mathematics Teaching Seminar

Chris Sangwin, University of Edinburgh

"Assessing students' proofs online"

In this seminar I will describe how we, at the University of Edinburgh, have tried to help students learn proof through online assessment. This is ongoing work, driven by a practical need and constrained by current technology which cannot automatically assess students' free form proof. The seminar will discuss the nature of elementary proof more generally.

Monday, November 2, 2020 — 4:00 PM EST

## Pure Math Colloquium

Andreas Thom, Technische Universität Dresden

"Finitary approximation properties of groups"

Motivated by the study of equations over groups, I will explain various finitary approximation properties of groups. Related to this, old questions of Ulam will reappear and we will motivate and discuss the notion of stability of solutions and almost solutions to algebraic equations.

Wednesday, October 28, 2020 — 2:00 PM EDT

## Algebra Seminar

Seda Albayrak, Department of Pure Mathematics, University of Waterloo

"A refinement of Christol’s theorem"

Monday, October 19, 2020 — 4:00 PM EDT

## Pure Math Colloquium

Sergey Grigorian, University of Texas Rio Grande Valley

"Smooth loops"

Friday, October 9, 2020 — 2:30 PM EDT

## Geometry & Topology Seminar

Niky Kamran, McGill University

"Non-uniqueness for the anisotropic Calderon problem"

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

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

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