Difference between revisions of "F-sigma"
From Encyclopedia of Mathematics
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| − | In a topological space $X$ a subset which is the countable union of closed sets | + | In a topological space $X$ a subset which is the countable union of closed sets. See [[Borel set]] and also [[G-delta]]. |
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Revision as of 13:29, 16 August 2012
2020 Mathematics Subject Classification: Primary: 28A33 [MSN][ZBL]
In a topological space $X$ a subset which is the countable union of closed sets. See Borel set and also G-delta.
How to Cite This Entry:
F-sigma. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=F-sigma&oldid=27599
F-sigma. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=F-sigma&oldid=27599