Square principle
id:
square-principle-253-17300301
title:
Square principle
text:
In mathematical set theory, a square principle is a combinatorial principle asserting the existence of a cohering sequence of short closed unbounded (club) sets so that no one (long) club set coheres with them all. As such they may be viewed as a kind of
incompactness phenomenon. They were introduced by Ronald Jensen in his analysis of the fine structure of the constructible universe L.
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Square_principle
date created:
date modified:
2024-03-04T06:28:48Z
main entity:
{"identifier":"Q5570898","url":"https://www.wikidata.org/entity/Q5570898"}
image:
fields total:
13
integrity:
13