G-delta
From Encyclopedia of Mathematics
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=27667
G-delta. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=G-delta&oldid=27667