pith. sign in

arxiv: 1803.03458 · v1 · pith:WHHVFY4Xnew · submitted 2018-03-09 · 🧮 math.GN · math.LO

Completely Baire spaces, Menger spaces, and projective sets

classification 🧮 math.GN math.LO
keywords completelyprojectivesetsbairemetrizableanalysisfirstmenger
0
0 comments X
read the original abstract

W. Hurewicz proved that analytic Menger sets of reals are $\sigma$-compact and that co-analytic completely Baire sets of reals are completely metrizable. It is natural to try to generalize these theorems to projective sets. This has previously been accomplished by $V = L$ for projective counterexamples, and the Axiom of Projective Determinacy for positive results. For the first problem, the first author, S. Todorcevic, and S. Tokg\"oz have produced a finer analysis with much weaker axioms. We produce a similar analysis for the second problem, showing the two problems are essentially equivalent. We also construct in ZFC a separable metrizable space with $\omega$-th power completely Baire, yet lacking a dense completely metrizable subspace. This answers a question of Eagle and Tall in Abstract Model Theory.

This paper has not been read by Pith yet.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.