σ-compact

adjective

That is expressible as a countable union of compact sets.

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Meanings

adjectiveσ-compact (not comparable)
  1. not comparablemathematical analysisThat is expressible as a countable union of compact sets.

Origin

The 'σ' stands for "countable union".

Full word history & related roots →
Cite this entry
APA

σ-compact. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/%CF%83-compact

MLA

“σ-compact.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/%CF%83-compact. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “σ-compact,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/%CF%83-compact.

Source: σ-compact on Wiktionary, CC BY-SA 4.0.