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Jeremy Rickard's user avatar
Jeremy Rickard's user avatar
Jeremy Rickard's user avatar
Jeremy Rickard
  • Member for 12 years, 8 months
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  • Bristol, United Kingdom
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396 Answers

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12 votes

Is every paracompact, Hausdorff, locally contractible space homotopy equivalent to a CW complex?

12 votes
Accepted

Repeating an operation infinitely makes any convex $n$-gon a regular $n$-gon?

12 votes

Do the isomorphism classes of indecomposable objects in $R{\text{-mod}}$ form a set?

12 votes

Group rings isomorphic over $\mathbf{F}_p$, but not over $\mathbf{Z}_p$?

11 votes

Quasi isomorphisms in a commutative diagram

11 votes
Accepted

Is any finite-dimensional algebra a sub-algebra of a finite-group algebra?

11 votes
Accepted

Do these properties of a countable abelian group guarantee a Prüfer subgroup?

11 votes
Accepted

Must the inclusion of an indecomposable module in the direct sum of two copies always split?

11 votes

Properties of vector spaces without AC

11 votes
Accepted

Monotonic bijections of rational numbers

11 votes

The cohomology group $H^{1}(GL_{2}(\mathbb{F}_{p}), M_{2}(\mathbb{F}_{p}))$

11 votes
Accepted

A linear category with objects of infinite length but which is otherwise finite?

11 votes

Swan K-theory of Z/4

11 votes
Accepted

Is a "smooth" finite-dimensional algebra separable modulo its radical?

10 votes

When is a functor a right derived functor?

10 votes
Accepted

Group cohomology with coefficients in a permutation module

10 votes
Accepted

About contractibility of certain categories

10 votes

How to calculate$ \sum \limits_{k=0}^{m-n} {m-k-1 \choose n-1} {k+n \choose n}$?

10 votes
Accepted

$p$-groups with trivial $H^3$

10 votes
Accepted

Bass' stable range for Bezout rings

10 votes

Uncertainty principle on finite groups

10 votes
Accepted

If the tensor power $M^{\otimes n} = 0$, is it possible that $M^{\otimes n-1}$ is nonzero?

10 votes
Accepted

Trace of finitely generated projective module

10 votes
Accepted

Are the character degrees determined by the conjugacy class sizes?

10 votes

Classification of commutative Frobenius algebras

10 votes
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Number of subgroups of a $p$-group of index $p^k$

10 votes
Accepted

Reference request: locally erasable delta-functor is universal

9 votes
Accepted

Double dual of free $\mathbb{Z}_{(p)}$-modules

9 votes

Trans-universality for finitely generated groups

9 votes
Accepted

Can the free module in the representation ring be characterised this way?

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