## 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

Friday, December 13, 2019 — 2:30 PM EST

**Jeremy Usatine, Brown University**

"Hyperplane Arrangements and Compactifying the Milnor Fiber"

Milnor fibers are invariants that arise in the study of hypersurface singularities. A major open conjecture predicts that for hyperplane arrangements, the Betti numbers of the Milnor fiber depend only on the combinatorics of the arrangement. I will discuss how tropical geometry can be used to study related invariants, the virtual Hodge numbers of a hyperplane arrangement's Milnor fiber. This talk is based on joint work with Max Kutler.

Thursday, December 12, 2019 — 11:00 AM EST

**Wilson Poulter, Department of Pure Mathematics, University of Waterloo**

"NIP IX"

We continue section 3.2 of Simon's Guide to NIP theories.

MC 5413

Tuesday, December 10, 2019 — 3:00 PM EST

**Maggie Miller, Princeton University**

"Light bulbs in 4-manifolds"

Monday, December 9, 2019 — 3:00 PM EST

**Yi Wang, State University of New York at Buffalo**

"Arveson-Douglas Conjecture --- a Harmonic Analysis Approach"

Tuesday, December 3, 2019 — 2:00 PM EST

**Dino Rossegger, Pure Math Department, University of Waterloo**

"Analytic complete equivalence relations and their degree spectra"

Tuesday, December 3, 2019 — 1:30 PM EST

**Fei Hu, Department of Pure Mathematics, University of Waterloo**

Building on previous preliminary results on the valuative tree at infinity (e.g., classification of valuations), I will describe the proof of Medvedev-Scanlon-Zhang conjecture for polynomial endomorphisms of the affine plane given by Junyi Xie in 2017.

Monday, December 2, 2019 — 4:00 PM EST

**Messoud Efendiyev, Helmholtz Zentrum Munich**

"Symmetry and Attractors"

Friday, November 29, 2019 — 1:30 PM EST

**Will Rushworth, McMaster University**

"Ascent concordance"

Thursday, November 28, 2019 — 1:30 PM EST

**Artour Tomberg, Western University**

"Irreducible vector bundles on hyperkähler twistor spaces"

Thursday, November 28, 2019 — 11:00 AM EST

**Steven Lazzaro, McMaster University**

"NIP VIII"

We continue section 3.1.2 of Simon's Guide to NIP Theories.

MC 5413

Wednesday, November 27, 2019 — 3:30 PM EST

**Dan Ursu, Department of Pure Mathematics, University of Waterloo**

"Relative C* - simplicity"

Tuesday, November 26, 2019 — 3:30 PM EST

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

"Plane Old Tilings"

Tuesday, November 26, 2019 — 3:00 PM EST

**Kateryna Tatarko, University of Alberta**

"Geometric methods in isoperimetric problems and random matrix theory"

Tuesday, November 26, 2019 — 2:00 PM EST

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

"Ramsey's Theorem"

We will discuss two different proofs of Ramsey's Theorem and compare their reverse mathematical strength.

MC 5413

Tuesday, November 26, 2019 — 1:30 PM EST

**Kübra Benli, University of Georgia**

"On the number of small prime power residues"

Monday, November 25, 2019 — 4:00 PM EST

**James Freitag, University of Illinois at Chicago**

"Model theory, automorphic functions, and differential equations"

Thursday, November 21, 2019 — 4:30 PM EST

**John Schanck, Department of Combinatorics & Optimization, University of Waterloo**

"Kummer's Theorem on binomial coefficients, etc."

Thursday, November 21, 2019 — 3:00 PM EST

**Polona Durcik, Caltech**

"On singular Brascamp-Lieb inequalities"

Thursday, November 21, 2019 — 11:00 AM EST

**Christopher Hawthorne, Department of Pure Mathematics, University of Waterloo**

"NIP VII"

We begin chapter 3 of Simon's Guide to NIP theories.

MC 5413

Wednesday, November 20, 2019 — 3:30 PM EST

**Sam Kim, Department of Pure Mathematics, University of Waterloo**

"Some logical aspects of hyperrigidity of operator systems"

Tuesday, November 19, 2019 — 3:00 PM EST

**Andrew Zimmer, Louisiana State University**

"Intrinsic and extrinsic geometries in several complex variables"

Tuesday, November 19, 2019 — 2:00 PM EST

**Brett Nasserden, Department of Pure Mathematics, University of Waterloo**

"Preparing for polynomial dynamics of the affine plane"

We will begin applying our knowledge of the valuative tree to the case of polynomial dynamics of the affine plane. Our goal is to begin understanding when a dominant polynomial morphism of the affine plane has a zariski dense orbit.

MC 5501

Monday, November 18, 2019 — 4:00 PM EST

**Henry Yuen, University of Toronto**

"Connes’ Embedding Problem through the lens of complexity theory"

Thursday, November 14, 2019 — 12:00 PM EST

**Dan Ursu, Pure Math Department, University of Waterloo**

"Relative C*-Simplicity"

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 Indigenous Initiatives Office.