Fake 4-ball
id:
fake-4-ball-243-8408228
title:
Fake 4-ball
text:
In mathematics, a fake 4-ball is a compact contractible topological 4-manifold. Michael Freedman proved that every three-dimensional homology sphere bounds a fake 4-ball. His construction involves the use of Casson handles and so does not work in the smooth category.
brand slug:
wiki
category slug:
encyclopedia
description:
Mathematical topological manifold
original url:
https://en.wikipedia.org/wiki/Fake_4-ball
date created:
date modified:
2023-10-11T14:09:25Z
main entity:
{"identifier":"Q5431456","url":"https://www.wikidata.org/entity/Q5431456"}
image:
fields total:
13
integrity:
14