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σ-compact∗ Koro† 2013-03-21 16:55:16 A topological space is σ-compact if it is a countable union of compact sets. ∗ hsigmacompacti created: h2013-03-21i by: hKoroi version: h35503i Privacy setting: h1i hDefinitioni h54D45i † This text is available under the Creative Commons Attribution/Share-Alike License 3.0. You can reuse this document or portions thereof only if you do so under terms that are compatible with the CC-BY-SA license. 1