σ-compact
Adjective. (analysis) (context, of a set in a topological space) That it is expressible as a countable union of compact sets.This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.
This entry was last updated on RefTopia from its source on 3/20/2012.