Simon Wadsley's user avatar
Simon Wadsley's user avatar
Simon Wadsley's user avatar
Simon Wadsley
  • Member for 14 years, 6 months
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21 votes
Accepted

Are there any finitely generated artinian modules that are not Noetherian?

15 votes
Accepted

Isomorphic but non-conjugate subgroups of $GL(n,\mathbb{Z})$ ?

15 votes

D-modules on rigid analytic spaces

13 votes

Can we categorify the equation (1 - t)(1 + t + t^2 + ...) = 1?

11 votes

Different definitions of the dimension of an algebra

10 votes

Can an infinite conjugacy class in a group split into more than one conjugacy class in some subgroup of finite index?

10 votes

Why should the tensor product of $\mathcal{D}_X$-modules over $\mathcal{O}_X$ be a $\mathcal{D}_X$-module?

10 votes
Accepted

What kind of algebraic object is $\mathcal{D}_X$? (algebra of diifferential operators). What's special about modules over it?

7 votes

Different definitions of the dimension of an algebra

7 votes

When are finite-dimensional representations on Hilbert spaces completely reducible?

7 votes

Faithful flatness and non-commutative algebras

6 votes
Accepted

Adjoint action on the universal enveloping algebra and the PBW theorem

6 votes
Accepted

Prove that the ideal of $\mathbb{C}G$ generated by a family of elements $\lbrace p_i\rbrace_{i=1}^n$ is equal to $\mathbb{C}G$

6 votes

Generalization of the two bucket puzzle

6 votes

Maximal Ideals in Formal Laurent Series Rings?

5 votes
Accepted

Polycyclic group not of type $FP_\infty$

5 votes

$\mathbb{Z}G$ (left) Noetherian$\Rightarrow$ $\ell^1(G)$ is a flat (right) $\mathbb{Z}G$-module?

5 votes
Accepted

Non-free projective modules for a Universal Enveloping Algebra?

5 votes
Accepted

Testing ideal membership in the Weyl algebra: a simple example

4 votes
Accepted

$R/I\cong R/\text{Ann}_R(R/I)$ but $I\neq\text{Ann}_R(R/I)$

4 votes
Accepted

What's the relation between pseudo-compact and admissible rings?

4 votes
Accepted

Is every endomorphism of the sheaf of holomorphic functions on a disk a differential operator?

4 votes
Accepted

Zero-divisors in a graded Lie algebra

4 votes
Accepted

Dual of a bimodule

4 votes
Accepted

Bi-embeddability vs. isomorphism

3 votes
Accepted

Separable and finitely generated projective but not Frobenius?

3 votes

How does one identify properties of objects with good "inheritance"?

3 votes

Relation between Lie Algebra Cohomology and Number of Relations of a Cyclic Module?

3 votes
Accepted

About the construction of the Universal Enveloping Lie Algebroid

3 votes

how many semi direct products are there?