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F-sigma

From Encyclopedia of Mathematics
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2010 Mathematics Subject Classification: Primary: 28A05 [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://www.encyclopediaofmath.org/index.php?title=F-sigma&oldid=27668