Just to fix the environment, let's work in the Baire space $\omega^\omega$, the space of infinite sequences of natural numbers with the product of the discrete topology over $\omega$. We say that a subset $A\subseteq \omega^\omega$ satisfies Hurewicz dichotomy if either it's $F_\sigma$ or there exists a Cantor set (a closed subset with no isolated points) $\mathcal{C}\subseteq \omega^\omega$ such that $\mathcal{C}\setminus A$ is countable dense in $\mathcal{C}$.
Now Hurewicz proved that
Every analytic subset $A\subseteq\omega^\omega$ satisfies the Hurewicz dichotomy.
Now my questions are:
- What is the consistency strength of the statement "Every subset of the Baire space satisfies the Hurewicz dichotomy"?
- What is the relationship between the Hurewicz dichotomy property and the perfect set property (also consistency-wise)?
Thanks!