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Jeremy Rickard's user avatar
Jeremy Rickard's user avatar
Jeremy Rickard
  • Member for 12 years, 8 months
  • Last seen this week
  • Bristol, United Kingdom
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Algebraist at the University of Bristol.

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answer
80
$A$ is isomorphic to $A \oplus \mathbb{Z}^2$, but not to $A \oplus \mathbb{Z}$
Jan 1, 2016
answer
58
Are there any nontrivial abelian categories with only finitely many objects?
Nov 10, 2012
answer
49
Example of an unnatural isomorphism
Aug 14, 2013
answer
46
Is it consistent with ZF that $V \to V^{\ast \ast}$ is always an isomorphism?
Jan 11, 2018
answer
46
Do vector spaces without choice satisfy Cantor-Schroeder-Bernstein?
Oct 23, 2020
question
36
Word evaluating to a group element and its inverse with different frequency
Jul 25, 2013
answer
35
Does the symmetric group on an infinite set have a minimal generating set?
Jul 10, 2014
answer
30
Are there only finitely many associative algebras of fixed dimension?
Jun 17, 2014
answer
30
If $A$, $B$ are abelian groups such that $\mathrm{Hom}(A, G) \cong \mathrm{Hom}(B, G)$ for all abelian groups $G$, must $A$ and $B$ be isomorphic?
Mar 4, 2023
question
29
The field of fractions of the rational group algebra of a torsion free abelian group
Jan 8, 2017
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MathOverflow user jailed
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Disappearing "Hi!"
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How to deal with answers that should be comments by users with not enough reputation to comment?
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Should we flag suspected ChatGPT posts?
13
How can I avoid getting a bounty?
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31
Can a ring without a unit element have a subring with a unit element?
28
Additive category that is not abelian
28
How much of a group $G$ is determined by the category of $G$-sets?
25
Is it possible that a left coset of $H$ contains more than one right coset of $H$?
23
Application of Hilbert's basis theorem in representation theory