F-sigma
From Encyclopedia of Mathematics
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2020 Mathematics Subject Classification: Primary: 28A33 [MSN][ZBL]
In a topological space $X$ a subset which is the countable union of closed sets and which is not itself closed. See Borel set.
How to Cite This Entry:
F-sigma. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=F-sigma&oldid=27595
F-sigma. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=F-sigma&oldid=27595