Infinity-Borel set
id:
infinity-borel-set-267-2281143
title:
Infinity-Borel set
text:
In set theory, a subset of a Polish space X is ∞-Borel if it
can be obtained by starting with the open subsets of X , and transfinitely iterating the operations of complementation and well-ordered union. This concept is usually considered without the assumption of the axiom of choice, which means that the ∞-Borel sets may fail to be closed under well-ordered union; see below.
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Infinity-Borel_set
date created:
date modified:
2023-12-25T23:35:15Z
main entity:
{"identifier":"Q17145837","url":"https://www.wikidata.org/entity/Q17145837"}
image:
fields total:
13
integrity:
13