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tj_
  • Member for 12 years, 5 months
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21 votes
Accepted

Example of group cohomology not annihilated by exponent of $G$?

12 votes

Results in linear algebra that depend on the choice of field

9 votes
Accepted

Ring where nonlinear polynomials have at least one root

8 votes

Conjugacy classes of PGL(3,Z)

8 votes

A question with simple and indecomposable modules

8 votes

Different Bialgebra/Hopf algebra structures on coalgebras

7 votes

Infinite noncyclic groups with abelian automorphism group

5 votes

About the classification of commutative and of cocommutative, fin. dim. Hopf algebras

4 votes
Accepted

Is the continuous dual of a topological chain complex chain equivalent to the algebraic dual?

4 votes
Accepted

If a commutative graded algebra is free over a graded subalgebra, then must it have a graded basis?

3 votes
Accepted

Reference request: conditions for the cardinality of the kernel of a linear map from $\mathbb{Z}_m^n \to \mathbb{Z}_m^k$ is a power of $m$

3 votes

Vanishing question for self-products in Galois cohomology

3 votes

Injective hull of quotient of modules

2 votes

On a dual of Kaplansky's $2^{nd}$ conjecture: admissible algebras?

2 votes

the number of minimal generating subsets of a group

2 votes

Can there be a non-trivial epimorphism (of rings) from a field?

2 votes
Accepted

integral closure of m-primary ideals

1 vote

Permutation covering of a $G$-lattice

1 vote

about maximal subgroup of p-groups

1 vote
Accepted

How to prove this by extension group

1 vote

Extensions of modules of type $FP_n$

1 vote
Accepted

When can every countably generated submodule of a a non-countably generated projective module be contained in a countably generated direct summand ?

1 vote

Projective objects in the category of chain complexes

-1 votes

commutative algebra, diagonal morphism