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Difference between revisions of "G-delta"

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A union (intersection) of a countable number of closed (open) sets. See [[Borel set|Borel set]].
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In a topological space $X$ a subset which is the countable intersection of open sets. See [[Borel set]] and also [[F-sigma]].

Latest revision as of 18:22, 18 August 2012

2020 Mathematics Subject Classification: Primary: 28A05 [MSN][ZBL]

In a topological space $X$ a subset which is the countable intersection of open sets. See Borel set and also F-sigma.

How to Cite This Entry:
G-delta. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=G-delta&oldid=12499