List questions from descriptive-set-theory | MathQa

Why is the intersection of countably many homogeneously Suslin subsets of $\,^{\omega} \omega$ homogeneously Suslin?

Published on 16 Apr 2025 - 4:44

Outline of Generic Separable Banach Spaces don't have a Schauder Basis

Published on 14 Apr 2025 - 5:12

Vanishing Cantor-Bendixson derivative if and only if scattered

Published on 14 Apr 2025 - 9:14

Is a bijective projection function measure preserving?

Published on 13 Apr 2025 - 8:32

Why is the Dynkin system generated by open intervals in $\mathbb{R}$ the Borel $\sigma$-algebra?

Published on 14 Apr 2025 - 15:11

Do (the restrictions of) continuous maps (to the rationals) form a Borel set?

Published on 14 Apr 2025 - 10:13

$\mathbb{R}^3$ \ $\mathbb{Q}^3$ is union of disjoint lines. The lines are not in an axis diretion.

Published on 14 Apr 2025 - 21:00

$\mathbb{R}^3$ \ $\mathbb{Q}^3$ is a union of disjoint lines, The lines are not in an axis direction.

Published on 14 Apr 2025 - 15:21

$\Pi^1_1$ singletons and $\Delta^1_2$ wellorders on $\omega$ in $L$

Published on 14 Apr 2025 - 7:13

For a Borel action of a locally compact second countable group G on a standard Borel space S, are the orbits always Borel?

Published on 14 Apr 2025 - 14:16