Rachael Alvir, Department of Pure Mathematics, University of Waterloo
"Effectively closed sets - Part VI"
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 start proving an effective version of the perfect set theorem.