$\Sigma^2_2$ -absoluteness

Speaker:

Hossein Lamei Ramandi, University of Toronto

Date and Time:

Friday, January 25, 2019 - 1:30pm to 3:00pm

Location:

Fields Institute, Room 210

Abstract:

We will show there is a $\Sigma^2_2$ sentence $\Phi$ such that both $\Phi$ and $\neg \Phi$ are consistent with $\diamondsuit$ . This answers a question due to Woodin.

The Fields Institute for
Research in Mathematical Sciences

$\Sigma^2_2$ -absoluteness

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$\Sigma^2_2$ -absoluteness