## Contact Info

Pure MathematicsUniversity of Waterloo

200 University Avenue West

Waterloo, Ontario, Canada

N2L 3G1

Departmental office: MC 5304

Phone: 519 888 4567 x43484

Fax: 519 725 0160

Email: puremath@uwaterloo.ca

Thursday, April 27, 2023 — 4:00 PM EDT

**Tomasz Tkocz, Carnegie Melon University**

**"Slicing l_p balls"**

I shall present recent progress on sharp bounds on volume of hyperplane sections of unit balls in l_p spaces, as well as their stability.

This seminar will be held both online and in person:

- Room: MC 5479
- Zoom link: https://uwaterloo.zoom.us/j/94186354814?pwd=NGpLM3B4eWNZckd1aTROcmRreW96QT09

Thursday, April 27, 2023 — 2:30 PM EDT

**Steve Rayan, University of Saskatchewan**

**"Resolutions of finite quotient singularities and quiver varieties"**

Tuesday, April 25, 2023 — 2:30 PM EDT

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

**"Relation between self-duality and conformal structures in dimension 4"**

Thursday, April 20, 2023 — 2:30 PM EDT

**Jun-Yong Park, University of Melbourne**

**"Height moduli on algebraic stacks and counting families of varieties"**

Thursday, April 20, 2023 — 1:00 PM EDT

**Andriy Haydys, Free University of Brussels**

**"What does the Alexander polynomial know about flat PSL(2,C)-connections?"**

Wednesday, April 19, 2023 — 2:00 PM EDT

**Andrej Vukovic, Department of Pure Mathematics, University of Waterloo**

**"Perfectoid Spaces, Diamonds, and Applications"**

I explain Peter Scholze's concepts of perfectoid spaces and diamonds, then describe some applications to the Langlands program.

This seminar will be held both online and in person:

Monday, April 17, 2023 — 2:30 PM EDT

**Amanda Petcu, Department of Pure Mathematics, University of Waterloo**

**"Some Calculations Regarding $G_2$ and the Isometric Flow I"**

Monday, April 17, 2023 — 1:30 PM EDT

**Nikon Kurnosov, University College London**

**"Holomorphic symplectic manifolds: IHS vs BG-manifolds"**

Thursday, April 13, 2023 — 4:00 PM EDT

**Padraig Daly, Department of Pure Mathematics, University of Waterloo**

**"Maps on the space of quantum channels"**

Thursday, April 13, 2023 — 2:30 PM EDT

**Gwyneth Moreland, Harvard University**

**"Nef and effective cones of the Hilbert scheme of 3 points in $\mathbb{P}^3$"**

We compute some higher (co)dimension nef and effective cones of the Hilbert scheme of 3 points in $\mathbb{P}^3$. This involves studying the orbits of the PGL action on the Hilbert scheme, as well as extending Mallavibarrena and Sols' bases for the Chow groups of Hilbert schemes of points on $\mathbb{P}^2$ to the case of the Hilbert scheme of 3 points in $\mathbb{P}^3$. This work builds on results of Ryan and Stathis.

Thursday, April 13, 2023 — 2:30 PM EDT

**Russell Miller, City University of New York**

**"Computability and the absolute Galois group of $\mathbb Q$"**

Wednesday, April 12, 2023 — 2:00 PM EDT

**Andrej Vukovic, Department of Pure Mathematics, University of Waterloo**

**"Perfectoid Spaces, Diamonds, and Applications"**

I explain Peter Scholze's concepts of perfectoid spaces and diamonds, then describe some applications to the Langlands program.

This seminar will be held both online and in person:

Tuesday, April 11, 2023 — 2:30 PM EDT

**Robert Cornea, Department of Pure Mathematics, University of Waterloo**

**"A proof of a Kobayashi-Hitchin correspondence for Vafa-Witten bundles, Part 1"**

In this talk we start with a theorem that states that if a Vafa-Witten pair (E,φ) over a Kähler surface is polystable is there exists a unique Hermitian metric on E that satisfies the Vafa-Witten equations. We will discuss the details of this theorem and give a proof of it due to Yuuji Tanaka.

MC 5403

Tuesday, April 11, 2023 — 2:30 PM EDT

**George Domat, Rice University**

**"Big Mapping Class Groups in Dimensions 0, 1, and 2"**

Thursday, April 6, 2023 — 5:00 PM EDT

**Robert Harris, Department of Pure Mathematics, University of Waterloo**

**"Constructing paper numbers and other applications of folds"**

Thursday, April 6, 2023 — 2:30 PM EDT

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

**"Computability-Theoretic Properties of Superatomic Boolean Algebras"**

Thursday, April 6, 2023 — 2:30 PM EDT

**Andrei Teleman, Aix-Marseille University**

**"Moduli spaces of holomorphic bundles framed along a real hypersurface"**

Tuesday, April 4, 2023 — 2:30 PM EDT

**Lucia Martin Merchan, Department of Pure Mathematics, University of Waterloo**

**"Formality of Joyce's manifolds (Part 2)"**

Tuesday, April 4, 2023 — 10:00 AM EDT

**Aahan Chatterjee, Department of Pure Mathematics, University of Waterloo**

**"On Freimann’s Theorem"**

We discuss a proof of Freimann’s Theorem that states :

If A is a set of integers for which there is a set B such that |A|=|B| and |A+B| is at most C|A|, then there are constants d and S such that A is contained in a Generalized Arithmetic Progression of dimension at most d and size at most S|A|.

This seminar will be held both online and in person:

Tuesday, April 4, 2023 — 9:00 AM EDT

**Eric Boulter, Department of Pure Mathematics, University of Waterloo**

**"Vector bundles on non-Kähler elliptic surfaces"**

Monday, April 3, 2023 — 2:30 PM EDT

**Sarah Koch, University of Michigan**

**"Dynamical data: from topology to algebra"**

University of Waterloo

200 University Avenue West

Waterloo, Ontario, Canada

N2L 3G1

Departmental office: MC 5304

Phone: 519 888 4567 x43484

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

The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land granted to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is centralized within our Office of Indigenous Relations.