Mathematics
Jeremy Rickard's user avatar
Jeremy Rickard's user avatar
Jeremy Rickard's user avatar
Jeremy Rickard
  • Member for 10 years, 2 months
  • Last seen this week
  • Bristol, United Kingdom
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Algebraist at the University of Bristol.

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All Questions Answers
Score Newest
answer
30
Can a ring without a unit element have a subring with a unit element?
Jun 25, 2014
answer
26
How much of a group $G$ is determined by the category of $G$-sets?
Feb 22, 2018
answer
24
Is it possible that a left coset of $H$ contains more than one right coset of $H$?
Sep 2, 2014
answer
24
Additive category that is not abelian
Jun 18, 2014
answer
23
Application of Hilbert's basis theorem in representation theory
Jun 27, 2020
answer
18
Is it true that a flat module is torsion-free over an arbitrary ring? Does the reverse implication hold for finitely generated modules?
Jun 10, 2015
answer
18
If the tensor power $M^{\otimes n} = 0$, is it possible that $M^{\otimes n-1}$ is nonzero?
May 10, 2014
answer
13
Example of $2$ non-isomorphic groups that have the same quotients
Mar 4, 2017
answer
12
Is this "coincidence" about representations of the Monster actually a coincidence?
Oct 21, 2022
answer
11
Elementary way to show the exact sequence $0 \to M \to \mathbf Z^2 \to \mathbf Z \to 0$ implies $M = \mathbf Z$
Sep 25, 2014
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$A$ is isomorphic to $A \oplus \mathbb{Z}^2$, but not to $A \oplus \mathbb{Z}$
57
Are there any nontrivial abelian categories with only finitely many objects?
49
Example of an unnatural isomorphism
46
Is it consistent with ZF that $V \to V^{\ast \ast}$ is always an isomorphism?
45
Do vector spaces without choice satisfy Cantor-Schroeder-Bernstein?

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