Sigma-Compact Topological Space

A -compact topological space is a topological space that is the union of countably many compact subsets.

See also

Compact Subset, Topological Space

This entry contributed by Mirko Hessel

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Hessel, Mirko. "Sigma-Compact Topological Space." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/Sigma-CompactTopologicalSpace.html

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