## 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

Wednesday, July 8, 2015 — 1:30 PM EDT

**Mohamed El Alami, Pure Math Department, University of Waterloo **

“Inoue Surfaces, Continued”

Monday, July 6, 2015 — 1:30 PM EDT

**Anthony McCormick, Department of Pure Mathematics, University of Waterloo **

“The Grigorchuk Group”

A finitely generated group is said to have intermediate growth if it has both superpolynomial and subexponential growth. In 1983, Grigorchuk answered the question asked by John Milnor: do groups with intermediate growth exist? We will discuss his answer to this question.

MC 5479

Monday, June 29, 2015 — 1:30 PM EDT

**Ehsaan Hossain, Department of Pure Mathematics, University of Waterloo **

“ELI5: Leavitt Path Algebras”

Abstract

Friday, June 26, 2015 — 12:30 PM EDT

**Adam Dor On, Department of Pure Mathematics, University of Waterloo **

“K-theory of graph C*-algebras : Strategy and computation”

Friday, June 26, 2015 — 11:23 AM EDT

**Mohamed El Alami, Pure Math Department, University of Waterloo **

“Inoue Surfaces”

Thursday, June 25, 2015 — 4:00 PM EDT

**James Haley, Department of Pure Mathematics, University of Waterloo **

“Preserving Reality”

Thursday, June 25, 2015 — 2:00 PM EDT

**David Belanger, Cornell University**

“Π1 conservation theorems and RCA∗0”

Wednesday, June 24, 2015 — 2:30 PM EDT

**Savio Ribas, Pure Math Department, University of Waterloo**

“EGZ constant and its (many!) generalizations”

Wednesday, June 24, 2015 — 1:30 PM EDT

**Adam Dor On, Department of Pure Mathematics, University of Waterloo **

“K-theory of graph C*-algebras : Crossed product preliminaries”

In this talk we will give a rather quick introduction to crossed product C* algebras. We will mainly focus on the case of abelian groups and look at some examples

MC 5417

Monday, June 22, 2015 — 1:30 PM EDT

**Ian Payne, Department of Pure Mathematics, University of Waterloo **

“What do Universal Algebraists do?”

Thursday, June 18, 2015 — 2:00 PM EDT

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

“Pseudo-Jump Inversion - Part II”

Wednesday, June 17, 2015 — 2:30 PM EDT

**Theodore Hui, Cornell University **

“Class Field Theory and its Applications”

Class Field Theory is just like Galois Theory or the Fundamental Theorem of Algebra in the sense that the statements are useful and powerful in their own rights - you don’t really need to worry too much about their proofs before knowing how to apply them.

Tuesday, June 16, 2015 — 1:30 PM EDT

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

“Differential Analysis IV: Thom-Smale Transversality”

Monday, June 15, 2015 — 1:30 PM EDT

**John Campbell, Department of Pure Mathematics, University of Waterloo**

“The Immaculate Basis and the Shin Basis of NSym”

Friday, June 12, 2015 — 12:30 PM EDT

**Adam Dor On, Department of Pure Mathematics, University of Waterloo **

“K-theory for graph C*-algebras”

After we’ve dealt with some K-theory, we introduce another six-term exact sequence due to Pimsner and Voiculescu in the context of graph algebras. We use our combined knowledge on K-theory and graph algebras to start computing the K-theory of a graph C*-algebra.

MC 5417

Thursday, June 11, 2015 — 2:00 PM EDT

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

“Pseudo-Jump Inversion and C.E. Operators”

Wednesday, June 10, 2015 — 1:30 PM EDT

**Anton Borissov, Pure Math Department, University of Waterloo **

“Divisors on Toric Varieties II”

After briefly reviewing what we did in the first talk, we will move on to discuss the orbit- cone correspondence, Weil divisors, and Cartier divisors on toric varieties. Time permitting we shall talk about how to compute the divisor class group and the Picard group on a toric variety.

M3 2134

Wednesday, June 10, 2015 — 1:30 PM EDT

**Ehsaan Hossain, Department of Pure Mathematics, University of Waterloo **

“Purely infinite graph C*-algebras, continued”

Tuesday, June 9, 2015 — 4:30 PM EDT

**Zack Cramer, Pure Mathematics Department, University of Waterloo**

"The Matrix-Tree Theorem"

Monday, June 8, 2015 — 1:30 PM EDT

**Blake Madill, Department of Pure Mathematics, University of Waterloo **

“GK Dimension and the Bergman Gap Theorem”

Friday, June 5, 2015 — 4:00 PM EDT

**Laurent Marcoux, David McKinnon, Nico Spronk, Ross Willard, Frank Zorzitto **

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

“Some Highly Influential and Extremely Important Short Presentations.”

5 accomplished speakers. 5 minutes each. 1 hilarious afternoon.

Friday, June 5, 2015 — 12:30 PM EDT

**Ehsaan Hossain, Department of Pure Mathematics, University of Waterloo **

“Purely infinite graph C*-algebras”

Back on the graph algebras track, we will describe necessary and sufficient graph-theoretic conditions for a graph algebra to be AF or purely infinite simple. It will follow that these two classes cover all the simple graph algebras.

MC 5417

Thursday, June 4, 2015 — 2:00 PM EDT

**Russell Miller, Queens College - City University of New York **

"Effective Classification of Computable Structures”

Wednesday, June 3, 2015 — 2:30 PM EDT

John C. Saunders, Department of Pure Math, University of Waterloo

“The Turan Sieve”

Abstract

Wednesday, June 3, 2015 — 1:30 PM EDT

**Anton Borissov, Pure Math Department, University of Waterloo **

“Divisors on Toric Varieties”

Toric Varieties are geometric objects that are described by combinatorial data. Their description allows one to compute many geometrical quantities in a straightforward fashion. In this talk we will define toric varieties and work towards describing the global sections of line bundles on them.

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.