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GeezerVison is showing mathworld.wolfram.com — Sigma-Compact Topological Space -- from Wolfram MathWorld

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Sigma-Compact Topological Space

A sigma-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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Cite this as:

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

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