G-delta
From Encyclopedia of Mathematics
Revision as of 08:30, 16 August 2012 by Camillo.delellis (talk | contribs)
2020 Mathematics Subject Classification: Primary: 28A33 [MSN][ZBL]
In a topological space $X$ a subset which is the countable intersection of open sets and which is not itself open. See Borel set.
How to Cite This Entry:
G-delta. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=G-delta&oldid=27600
G-delta. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=G-delta&oldid=27600