List questions from descriptive-set-theory

Published on 18 Jun 2023 - 7:17

191

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Which countable ordinals are common to every $\omega$-model of ZF?

Published on 11 Jul 2023 - 6:20

68

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Refine product topology to make Borel sets be clopen

Published on 23 Feb 2026 - 4:55

44

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Why does the measure of the geometric difference yield a complete metric space on the $\sigma$-algebra?

Published on 13 Jul 2023 - 2:53

74

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Is there a transfinite version of Post's Theorem?

Published on 15 Jul 2023 - 9:51

49

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Product with a discrete topology

Published on 17 Jul 2023 - 17:09

60

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Why does a zero'th order quantifier not increase the complexity of a $\bf{\Sigma}^1_1$ or $\bf{\Pi{^1_1}}$ assertion?

Published on 18 Jul 2023 - 9:30

28

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Is the family of co-dense subsets of a space ideal?

Published on 28 Jul 2023 - 12:23

57

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Dense co-dense subsets of a subspace of the Baire space

Published on 29 Jul 2023 - 15:14

38

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Diagonal of the power of a standard Borel space is isomorphic to the original space

Published on 22 Aug 2023 - 10:15

76

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Given $p\in[0,1]$ form a set $\Omega$ and a function $f$ such that $\{f = 1\} = p$ and $\{f = 0\} = 1-p$

Published on 06 Sep 2023 - 0:10

88

Views

Two set-theoretical assumptions

Published on 07 Sep 2023 - 15:48

157

Views

Alpha recursion - Constructible universe and Analytical hierarchy

Published on 25 Mar 2026 - 7:58

137

Views

Why isn't $[0,1]^{\aleph_1}$ isomorphic to $[0,1]$ as a measure space.

Published on 28 Oct 2023 - 16:37

53

Views

Are projective sets from descriptive set theory projective objects in Set category?

Published on 14 Nov 2023 - 13:15

List Question

A erroneous Suslin scheme

Which countable ordinals are common to every $\omega$-model of ZF?

Refine product topology to make Borel sets be clopen

Why does the measure of the geometric difference yield a complete metric space on the $\sigma$-algebra?

Is there a transfinite version of Post's Theorem?

Product with a discrete topology

Why does a zero'th order quantifier not increase the complexity of a $\bf{\Sigma}^1_1$ or $\bf{\Pi{^1_1}}$ assertion?

Is the family of co-dense subsets of a space ideal?

Dense co-dense subsets of a subspace of the Baire space

Diagonal of the power of a standard Borel space is isomorphic to the original space

Given $p\in[0,1]$ form a set $\Omega$ and a function $f$ such that $\{f = 1\} = p$ and $\{f = 0\} = 1-p$

Two set-theoretical assumptions

Alpha recursion - Constructible universe and Analytical hierarchy

Why isn't $[0,1]^{\aleph_1}$ isomorphic to $[0,1]$ as a measure space.

Are projective sets from descriptive set theory projective objects in Set category?

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