Fσ set
id:
f-set-245-17688023
title:
Fσ set
text:
In mathematics, an Fσ set is a countable union of closed sets. The notation originated in French with F for fermé and σ for somme. The complement of an Fσ set is a Gδ set. Fσ is the same as Σ 2 0 in the Borel hierarchy.
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/F%CF%83_set
date created:
date modified:
2024-01-06T13:38:23Z
main entity:
{"identifier":"Q4392123","url":"https://www.wikidata.org/entity/Q4392123"}
image:
fields total:
13
integrity:
13