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Kunen exercise IV.4.13 (4): Topological version of effective AC
general-topology
computability
descriptive-set-theory
cantor-set
Cardinality of Borel sigma algebra
real-analysis
measure-theory
probability-theory
set-theory
descriptive-set-theory
The $\sigma$-algebra of subsets of $X$ generated by a set $\mathcal{A}$ is the smallest sigma algebra including $\mathcal{A}$
descriptive-set-theory
measure-theory
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