# Events by date

## Thursday, February 9, 2023

### Computability Theory Learning Seminar

Thursday, February 9, 2023 — 2:30 PM EST

Luke MacLean, Department of Pure Mathematics, University of Waterloo

"Effectively closed sets - Part V"

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 continue proving basis theorems and take a brief detour into Martin-Lof randomness.

MC 5403

### Geometry & Topology Seminar

Thursday, February 9, 2023 — 2:30 PM EST

Rasul Shafikov, Western University

"Lagrangian embeddings, rational convexity, and approximation"

A celebrated theorem of Duval and Sibony characterizes rationally convex real submanifolds in complex Euclidean spaces as those isotropic with respect to a Kahler form. I will discuss how the results in symplectic geometry can be used to obtain some new results in the approximation theory.

MC 5417

### Analysis Seminar

Thursday, February 9, 2023 — 4:00 PM EST

Camila Sehnem, Department of Pure Mathematics, University of Waterloo

"C*-envelopes and semigroup C*-algebras"

### February 2023

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