Countryman line
id:
countryman-line-262-4835484
title:
Countryman line
text:
In mathematics, a Countryman line is an uncountable linear ordering whose square is the union of countably many chains. The existence of Countryman lines was first proven by Shelah. Shelah also conjectured that, assuming PFA, every Aronszajn line contains a Countryman line. This conjecture, which remained open for three decades, was proven by Justin Moore.
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Countryman_line
date created:
date modified:
2022-05-23T12:49:42Z
main entity:
{"identifier":"Q5177543","url":"https://www.wikidata.org/entity/Q5177543"}
image:
fields total:
13
integrity:
13