最終更新日：2024/08/01

(mathematical analysis, of a set in a topological space) That is expressible as a countable union of compact sets.

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σ-compact

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σ-compact

adj

(mathematical analysis, of a set in a topological space) That is expressible as a countable union of compact sets.

The set of real numbers is σ-compact.

意味（1）

(mathematical analysis, of a set in a topological space) That is expressible as a countable union of compact sets.