# Events by month

## September 2022

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### Analysis Seminar

Thursday, September 8, 2022 — 4:00 PM EDT

Sang-Gyun Youn, Seoul National University

"Information-theoretic analysis of covariant quantum channels"

### Colloquium

Monday, September 12, 2022 — 2:30 PM EDT

Claude LeBrun, Stony Brook University

"Four-Manifolds, Conformal Curvature, and Differential Topology"

### Algebraic Geometry Working Seminar

Tuesday, September 13, 2022 — 1:30 PM EDT

Organizational Meeting

The algebraic geometry working seminar is starting up again for the term with a meeting to discuss scheduling. Anyone interested in the seminar but unable to attend the meeting should email Eric at etboulter@uwaterloo.ca with any conflicts. This seminar is primarily aimed at grad students and post docs in algebraic geometry and related fields, but all are welcome to attend.

This seminar will be held jointly online and in person:

### Differential Geometry Working Seminar

Tuesday, September 13, 2022 — 2:30 PM EDT

This will be an organizational meeting for the Differential Geometry Working Seminar. Please contact Spiro Karigiannis with any questions.

MC 5403

### Number Theory Seminar

Tuesday, September 13, 2022 — 2:30 PM EDT

Kevin Hare, Department of Pure Mathematics, University of Waterloo

"Matrix based number system"

Most number systems are of the form $a_k d^k + a_{k-1} d^{k-1} + … + a_0$ where the $a_i$ are taken from a finite set of digits, and $d$ is the base of the number system.

In this talk we will discuss what happens if $d$ is taken to be a $n \times n$ Jordan block and $a_i$ are taken to be vectors.

### Student Number Theory Seminar

Tuesday, September 20, 2022 — 10:00 to 10:00 AM EDT

Xingchi Ruan, Department of Pure Mathematics, University of Waterloo

"On the Solubility of Diophantine Systems"

### Algebraic Geometry Working Seminar

Tuesday, September 20, 2022 — 12:30 to 12:30 PM EDT

**Note: change of meeting time - this seminar will be held from 12:30-1:30 pm.**

Michael Albanese, Department of Pure Mathematics, University of Waterloo

"The Kodaira-Enriques Classification of Surfaces"

I will give a brief overview of the classification of compact complex surfaces and mention some related results.

This seminar will be held jointly online and in person:

Room: MC 5403 Zoom information: Meeting ID: 817 1030 9714; Passcode: 063438

### Differential Geometry Working Seminar

Tuesday, September 20, 2022 — 2:00 PM EDT

Paul Cusson, Department of Pure Mathematics, University of Waterloo

"Infinite Flag Manifolds and Vector Bundle Filtrations"

### Computability Learning Seminar

Thursday, September 22, 2022 — 10:30 to 10:30 AM EDT

Rachael Alvir, Department of Pure Mathematics, University of Waterloo

"Scott Complexity"

### Horospherical MMP Seminar

Thursday, September 22, 2022 — 1:00 PM EDT

Sean Monahan, Department of Pure Mathematics, University of Waterloo

"Introduction to horospherical varieties"

We will begin the seminar with an introduction to horospherical varieties. In this talk we will define horospherical varieties, and we will (at least start to) discuss their “colours”.

This seminar will be held jointly online and in person:

### Logic Seminar

Friday, September 23, 2022 — 10:30 to 10:30 AM EDT

Andy Zucker, Department of Pure Mathematics, University of Waterloo

"Polish partition principles and the Halpern-Lauchli theorem"

### Algebraic Geometry Working Seminar

Tuesday, September 27, 2022 — 12:30 to 12:30 PM EDT

Xiao Zhong, Department of Pure Mathematics, University of Waterloo

"$p$-Adic interpolation of orbits under rational maps"

Rivera-Letelier’s characterization of possible analytic uniformizations of $p$-adic analytic maps has played an important role within arithmetic dynamics over the past fifteen years. The characterization is given by a trichotomy of indifferent, attracting and superattracting cases near a fixed point of a map.

### Differential Geometry Working Seminar

Tuesday, September 27, 2022 — 2:00 PM EDT

Benoit Charbonneau, Department of Pure Mathematics, University of Waterloo

"Hyperkähler structure of bow varieties"

My aim is to discuss some of the background material necessary to understand the recent paper of Roger Bielawski, Yannic Borchard, and Sergey Cherkis titled “Deformations of instanton metrics” (https://arxiv.org/abs/2208.14936).

MC 5403

### Number Theory Seminar

Tuesday, September 27, 2022 — 2:30 PM EDT

Jerry Wang, Department of Pure Mathematics, University of Waterloo

"An improvement to the Schmidt bound"

Counting number fields of fixed degree and bounded discriminant is a classical question in arithmetic statistics. The problem is known in degrees at most 5. In this talk, we will talk about an improvement to Schmidt's upper bound for general degree n, which beats existing improvements for n up to 94. This is joint work with Manjul Bhargava and Arul Shankar.

This seminar will be held jointly online and in person:

### Horospherical MMP Seminar

Thursday, September 29, 2022 — 1:00 PM EDT

Sean Monahan, Department of Pure Mathematics, University of Waterloo

"Colours of horospherical varieties"

We are continuing with the basics of horospherical varieties. In this talk I plan to discuss colours of horospherical varieties, and we will start to see their role in the combinatorial description of horospherical varieties.

This seminar will be held jointly online and in person:

### Geometry & Topology Seminar

Thursday, September 29, 2022 — 2:30 PM EDT

Izar Alonso Lorenzo, Oxford University

"Balanced SU(3)-structures and coclosed $G_2$-structures in cohomogeneity one manifolds"

Friday, September 30, 2022 — 4:30 PM EDT

Yuming Zhao, Department of Pure Mathematics, University of Waterloo

"Positivity and sum-of-squares"

### September 2022

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