## 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

**Returning to in-person experiences in February:** Visit the COVID-19 website for more information.

Thursday, December 17, 2015 — 10:00 AM EST

**Marie-Franoise Roy, Universite de Rennes (France) **

“Recursive bound for Hilbert 17-th problem”

Tuesday, December 15, 2015 — 2:00 PM EST

Talk 1.

**Henry Liu, Pure Mathematics Department, University of Waterloo **

“Moduli Space of Yang-Mills Instantons”

Friday, December 11, 2015 — 3:30 PM EST

**Martino Lupini, Caltech **

“A functional analytic perspective on Poulsen’s simplex”

Thursday, December 10, 2015 — 2:30 PM EST

**Yadira Valdivieso, Laval University **

“Hochschild cohomology of Jacobian algebras from unpunctured surfaces: a geometric computation”

Wednesday, December 2, 2015 — 3:30 PM EST

**Mohammad Mahmoud, Department of Pure Mathematics, University of Waterloo **

“Schnorr Randomness”

We will show that the notion of Schnorr randomness is consistent with intuition and leads to the desired statistical properties of random sets. Also we will prove the nice facts we have stated about the Schnorr test.

MC 5403

**Please Note Room Changed**

Wednesday, December 2, 2015 — 3:30 PM EST

**Raymond Cheng, Department of Pure Mathematics, University of Waterloo **

“Variations on a Theme of Hodge, Variation III: Periods, Infinitesimally”

Wednesday, December 2, 2015 — 2:30 PM EST

**Erik Maki, University of Waterloo **

“Iterated Function Systems and the Inverse Problem”

We introduce iterated function systems, a subset of discrete dynamical systems. A few examples of self similar sets generated by such systems and motivation for the inverse problem of approximation are given. We show some work towards a practical solution of the inverse problem, speci

Monday, November 30, 2015 — 4:00 PM EST

**Xiaoheng Jerry Wang, Princeton University**

"Density of polynomials with squarefree discriminant"

The problem of the density of squarefree discriminant polynomials is an old one, being considered by many people, and the density being conjectured by Lenstra. A proof has been out of question for a

Friday, November 27, 2015 — 4:30 PM EST

**Henry Liu, Department of Pure Mathematics, University of Waterloo **

“Renormalization Theory (Part 2)”

Friday, November 27, 2015 — 3:30 PM EST

**Niushan Ga, Southwest Jiaotong University **

“Unbounded Order Convergence in Banach lattices”

Thursday, November 26, 2015 — 5:00 PM EST

**Robert (Xu) Yang, Department of Pure Mathematics, University of Waterloo **

“Interpolation Sets in Z” Abstract

Thursday, November 26, 2015 — 4:00 PM EST

**Fernando Xuancheng Shao, University of Oxford**

"Vinogradov's theorem in twin almost primes"

Wednesday, November 25, 2015 — 3:30 PM EST

**Mohammad Mahmoud, Department of Pure Mathematics, University of Waterloo **

“Notions weaker than ML-randomness”

Though Martin-L ̈of randomness is the central randomness notion we have discussed, one can address criticisms to the claim that this notion is the appropriate one by considering weaker and stronger randomness notions for sets. We will discuss weaker variants.

MC 5403

Wednesday, November 25, 2015 — 3:30 PM EST

**Mohamed El Alami, University of Waterloo**

"Griffith's theorem and its applications"

In this talk, we will see how all of the machinery we built so far in this seminar, culminates in the statement of Griffith's theorem, which produces a well behaved description of the derivative of the period map in terms of the Kodaira-Spencer map. The power of this result will be explored through concrete examples. In particular, We will make our first encounter with a Torelli theorem.

MC 5479

Tuesday, November 24, 2015 — 2:30 PM EST

**Margaret Thomas, University of Konstanz**

"Effective Pila--Wilkie bounds for restricted Pfaffian surfaces"

Tuesday, November 24, 2015 — 11:30 AM EST

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

“Goldie’s Theorem on semiprime rings”

Monday, November 23, 2015 — 4:00 PM EST

**Brent Pym, University of Oxford**

"Holomorphic Poisson brackets and noncommutative geometry''

Friday, November 20, 2015 — 4:30 PM EST

**Henry Liu, Department of Pure Mathematics, University of Waterloo **

“Renormalization Theory (Part 1)”

Friday, November 20, 2015 — 3:30 PM EST

**Timothy Rainone, Department of Pure Mathematics, University of Waterloo **

“Noncommutative Dynamics and Finiteness in C*-Crossed Products”

Friday, November 20, 2015 — 2:30 PM EST

**Xi Chen, University of Alberta**

“Xiaos Conjecture on Canonically Fibered Surfaces”

In 1988, Gang Xiao proposed a list of open problems on algebraic surfaces. Many of these remain open to this day. One of the problems concerns the maximal relative genus of a canonically fibered surface. In this talk, I will talk about my proof of this conjecture.

Thursday, November 19, 2015 — 4:00 PM EST

**Kate Juschenko, Northwestern University**

Thursday, November 19, 2015 — 1:30 PM EST

**Akshaa Vatwani, Queen’s University **

“A higher rank Selberg sieve and applications”

We present a general higher rank Selberg sieve and apply it to various questions in number theory. In particular, we improve upon a result of Heath-Brown on almost prime k-tuples. This is joint work with Professor Ram Murty.

Thursday, November 19, 2015 — 10:00 AM EST

**Ross Willard, Department of Pure Mathematics, University of Waterloo **

“Finite atomistic directly indecomposable modular lattices and finite projective geometries”

Wednesday, November 18, 2015 — 4:00 PM EST

**Jonas Azzam, Universitat Autonoma de Barcelona**

"Multiscale analysis of rectifiable sets"

Wednesday, November 18, 2015 — 3:30 PM EST

**Michael Deveau, Department of Pure Mathematics, University of Waterloo **

“Relative Randomness and van Lambalgen’s Theorem - Part 3”

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.