GreginGre's user avatar
GreginGre's user avatar
GreginGre's user avatar
GreginGre
  • Member for 10 years, 8 months
  • Last seen this week
1 vote
1 answer
110 views

Embedding noetherian domains in a PID with finite index

3 votes
0 answers
60 views

Automorphisms of matrix algebras and Picard group

2 votes
0 answers
174 views

Finite groups $G$ such that every Galois extension of group $G$ is totally real

3 votes
0 answers
108 views

Similar reduced integral matrices

3 votes
0 answers
62 views

Specialization of an irreducible polynomial and monogeneous ring of integers

4 votes
1 answer
630 views

Quotients of a ring of integers

2 votes
0 answers
69 views

Automorphisms of algebras and orthogonal groups

4 votes
1 answer
142 views

Linear maps preserved by algebra automorphisms

3 votes
1 answer
925 views

Cute/striking application(s) of snake lemma outside homological algebra

2 votes
0 answers
45 views

Nondegenerate linear maps functorially associated to algebras

5 votes
1 answer
241 views

Are these two constructions of $K_0(A)$ isomorphic?

6 votes
2 answers
498 views

Torsors over complete local fields

1 vote
0 answers
122 views

Rational points of torsors over a separable closure

5 votes
1 answer
482 views

Image of the trace map of ring of integers

13 votes
1 answer
917 views

Axiom(s) of choice and bases of vector spaces

7 votes
0 answers
223 views

Computation of $H^2(S_n,\mathbb{Z}/2\mathbb{Z})$

2 votes
0 answers
67 views

Are these convex cones polyhedral?

1 vote
2 answers
1k views

2-class group of a quadratic imaginary extension

1 vote
1 answer
149 views

Unitary matrices and $\mathcal{O_k}$-order of $M_n(\mathbb{C})$