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Guntram
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3 votes
1 answer
367 views

GL(n+1)- vs. GL(n)-orbits

4 votes
8 answers
7k views

What's the difference between 2 and 3? [closed]

5 votes
2 answers
487 views

Symmetric matrices as a module over the skewsymmetric ones

23 votes
7 answers
3k views

Which group does not satisfy the Tits alternative?

1 vote
2 answers
2k views

The normalizer of a reductive subgroup

1 vote
2 answers
710 views

Do representations of finite groups of Lie type preserve diagonalizable elements?

19 votes
5 answers
2k views

Are extensions of linear groups linear?

7 votes
2 answers
2k views

Jacobson-Morozov on the algebraic group level

3 votes
1 answer
250 views

Which algebraic groups are generated by (lifts of) reflections?

6 votes
3 answers
3k views

Whenever I read "centraliser of maximal split torus", I think of...

5 votes
1 answer
367 views

How far can the analogy between a Cayley graph and a symmetric space be pushed?

9 votes
3 answers
723 views

If L is a field extension of K, how big is L*/K*?

35 votes
3 answers
6k views

What is the difference between PSL_2 and PGL_2?

1 vote
2 answers
976 views

When is a generalized Cartan matrix invertible?

2 votes
2 answers
511 views

Algebraic groups of relative rank 1