## 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, January 26, 2023 — 10:00 to 10:00 AM EST

The intent of this seminar is to cover some of the basic theory of elliptic curves. Our first objective is to cover chapters 2, 3 and 6 from *Joseph Silverman*’s book (*The Arithmetic of Elliptic Curves*). Later in the semester, we will switch our focus towards more specific topics in the theory of elliptic curves.

This week's presenter is Yash Singh, Department of Pure Mathematics, University of Waterloo.

MC 5403

Thursday, January 26, 2023 — 2:30 PM EST

**Joey Lakerdas-Gayle, Department of Pure Mathematics, University of Waterloo**

**"Effectively closed sets - Part III"**

An effectively closed set (or $\Pi^0_1$ class) in Baire space $\omega^\omega$ is the set $[T]$ of infinite branches through a computable tree $T$. This semester in the computability seminar, we will be studying $\Pi^0_1$ classes from Cenzer \& Remmel's textbook. This week, we will conclude chapter 2 by discussing some applications of $\Pi^0_1$ classes in computability theory.

MC 5403

Thursday, January 26, 2023 — 4:00 PM EST

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

**"Amenability and stability for discrete groups"**

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.