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$L[a] \cap 2^{\omega}$ is $\Sigma_2^1$

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#set-theory #descriptive-set-theory
139
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Confused by this proof in Jech's set theory

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#real-analysis #proof-explanation #set-theory #descriptive-set-theory #borel-sets
80
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Essentially infinite continuous maps $\prod_{\mathbf{N}} \mathbf{N} \rightarrow \mathbf{N}$?

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#general-topology #descriptive-set-theory
28
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Why is transfinite recursion needed for the construction of Borel sets?

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#measure-theory #set-theory #descriptive-set-theory #borel-sets
69
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Suslin measurable sets and the smallest field containing all analytic sets

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#general-topology #measure-theory #set-theory #descriptive-set-theory #polish-spaces
22
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Set of infinite well founded trees if complete coanalytic?

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#descriptive-set-theory
21
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Is a totally ordered set consisting of discrete point sets containing point p a well-ordered set?

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#elementary-set-theory #descriptive-set-theory #transfinite-recursion
43
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Definition of a Partial Order (In: Kanamori, The Higher Infinite)

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#set-theory #descriptive-set-theory #forcing
538
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Three Notions of Small

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#real-analysis #measure-theory #set-theory #math-history #descriptive-set-theory
280
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Background & Advice for a self-learner of Descriptive Set Theory

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#soft-question #set-theory #self-learning #descriptive-set-theory
53
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How to find example such $A^{(n)}$ are different each other

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#real-analysis #general-topology #examples-counterexamples #descriptive-set-theory
315
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image or projection of a universally measurable set

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#measure-theory #descriptive-set-theory
242
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Measurability Question?

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#measure-theory #descriptive-set-theory
277
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Problem with the definition of tree in descriptive set theory

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#descriptive-set-theory
198
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Questions of Hyperspace of Compact Sets

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#general-topology #descriptive-set-theory

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