# G-delta

From Encyclopedia of Mathematics

(Redirected from Set of type F sigma(G delta))

2010 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:**

Set of type F sigma(G delta).

*Encyclopedia of Mathematics.*URL: http://encyclopediaofmath.org/index.php?title=Set_of_type_F_sigma(G_delta)&oldid=27593