Loading…
The Brouwer invariance theorems in reverse mathematics
In [12], John Stillwell wrote, ‘finding the exact strength of the Brouwer invariance theorems seems to me one of the most interesting open problems in reverse mathematics.’ In this article, we solve Stillwell’s problem by showing that (some forms of) the Brouwer invariance theorems are equivalent to...
Saved in:
Published in: | Forum of mathematics. Sigma 2020, Vol.8, Article e51 |
---|---|
Main Author: | |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | In [12], John Stillwell wrote, ‘finding the exact strength of the Brouwer invariance theorems seems to me one of the most interesting open problems in reverse mathematics.’ In this article, we solve Stillwell’s problem by showing that (some forms of) the Brouwer invariance theorems are equivalent to the weak König’s lemma over the base system
${\sf RCA}_0$
. In particular, there exists an explicit algorithm which, whenever the weak König’s lemma is false, constructs a topological embedding of
$\mathbb {R}^4$
into
$\mathbb {R}^3$
. |
---|---|
ISSN: | 2050-5094 2050-5094 |
DOI: | 10.1017/fms.2020.52 |