EDB β€” 2CX

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Definition 2

[2CX]A set \(E\) is called a \(F_𝜎\) if it is a countable union of closed sets.

(See also exercise [0QC]).

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Authors: "Mennucci , Andrea C. G." .
Bibliography
Book index
  • \(F_\sigma \) , see F-sigma
  • F-sigma
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