## University COVID-19 update

### Questions about buildings and services? Visit the list of Modified Services.

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

# Events - 2020

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

Tuesday, March 3, 2020 — 2:00 PM EST

## Computability Learning Seminar

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

## Number Theory Seminar

Sacha Mangarel, Centre de Recherches Mathématiques

"On Low Discrepancy Multiplicative Sequences"

Tuesday, March 3, 2020 — 10:30 AM EST

## Model Theory Learning Seminar

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

## Frobenius Algebras and TQFT Learning Seminar

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

## Colloquium

Ilan Hirshberg, Ben Gurion University of the Negev

"Mean dimension and radius of comparison"

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

## Analysis Seminar

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

## Geometry & Topology Seminar

Michael Klug, University of California Berkeley

"Concordance of homotopic spheres in 4-manifolds"

Wednesday, February 26, 2020 — 3:30 PM EST

Wilson Poulter, Department of Pure Mathematics, University of Waterloo

"Ultraproducts, Hyperreals, and Pseudofinite Graphs"

An ultraproduct is a construction used in mathematical logic to construct limits of first-order structures. Due to a result of Jerzy Los, the first-order properties of these limits is very well understood, allowing one to construct counter-examples as well as structures that are interesting in and of themselves.

Wednesday, February 26, 2020 — 2:30 PM EST

## Valuative Tree Seminar

Brett Nasserden, Department of Pure Mathematics, University of Waterloo

"An introduction to the Laplacian operator on a metrized graph: Part 2"

We will continue our discussion of harmonic analysis on a finite metrized graph. The goal is to finish the introduction to the theory and go over some explicit examples.

MC 5403

Tuesday, February 25, 2020 — 2:30 PM EST

## Algebra Seminar

Ehsaan Hossain, Department of Pure Mathematics, University of Waterloo

"Return Sets on Algebraic Varieties"

Tuesday, February 25, 2020 — 2:00 PM EST

## Computability Learning Seminar

Dino Rossegger, Department of Pure Mathematics, University of Waterloo

"Iterated Reflection principles and Feferman's Completeness Theorem"

Tuesday, February 25, 2020 — 11:00 AM EST

## Geometry Working Seminar

Andrew Staal, Department of Pure Mathematics, University of Waterloo

"Reducibility of Varieties of Commuting Matrices"

We will present some well-known results on reducibility of the varieties C(k,n) of commuting k-tuples of nxn-matrices.  In particular, we will discuss the Motzkin—Taussky Theorem proving irreducibility of C(2,n) and Guralnick’s Theorem, which shows that C(3,n) is reducible when n ≥ 29.

MC 5413

Tuesday, February 25, 2020 — 10:30 AM EST

## Logic Seminar

Alexi Taylor Block Gorman, University of Illinois at Urbana-Champaign

"Continuous Regular Functions: where automata theory meets metric geometry"

Tuesday, February 25, 2020 — 10:00 AM EST

## Frobenius Algebras and TQFT Learning Seminar

Hongdi Huang, Department of Pure Mathematics, University of Waterloo

This week, we will further talk about the generators and relations for 2Cob.

MC 5417

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