User Jim Humphreys

6 votes

Accepted

abelian centralizers in almost simple groups

answered Dec 15, 2011 at 15:41

6 votes

Twisted affine Lie algebras

answered Feb 18, 2012 at 20:11

6 votes

Accepted

Applications of the Roggenkamp-Scott theorem ?

answered May 25, 2012 at 22:29

6 votes

Why can I divide an affine variety by the action of the general linear group?

answered Apr 17, 2012 at 18:01

6 votes

The prime divisors of a simple group

answered Apr 7, 2012 at 12:37

6 votes

Accepted

A Realization Problem for Character Tables

answered Mar 2, 2012 at 23:31

6 votes

reductive group orbits in P(V)?

answered Nov 16, 2011 at 0:17

6 votes

Software for Borel-Weil-Bott in positive characteristic?

answered Oct 14, 2011 at 20:38

6 votes

group scheme neither affine, nor an abelian variety

answered May 18, 2011 at 10:24

6 votes

Lists of small groups

answered Apr 27, 2011 at 23:42

6 votes

Accepted

When is the Levi subalgebra an ideal?

answered Apr 18, 2011 at 11:12

6 votes

Accepted

A question on the root systems of simple Lie algebras in the 90 degree case

answered Apr 7, 2011 at 13:15

6 votes

Accepted

Quick easy question - representation theory

answered Jun 22, 2012 at 15:41

6 votes

Accepted

What is a (generalized) BN-pair?

answered Jun 27, 2012 at 12:47

6 votes

Accepted

f.g. modules vs. f.g. projective modules

answered Aug 18, 2012 at 11:28

6 votes

algebraic groups and their Lie algebras

answered Nov 30, 2012 at 15:56

6 votes

"geometric" description of the algebra of central functions on a Lie group

answered Jan 23, 2013 at 23:27

6 votes

Accepted

Kostant's theorem about U(g) being free over Z(g) and a corollary of it

answered Feb 14, 2013 at 14:42

6 votes

center of the centralizer of semisimple element

answered Jan 8, 2013 at 21:19

6 votes

Lie algebra $\mathfrak{so}(9)$ as a subalgebra of $\mathfrak{f}_4$

answered Mar 24, 2013 at 20:40

6 votes

Naive question about the representation theory of algebraic groups and hopf algebras

answered Mar 30, 2013 at 21:58

6 votes

Subgroups of $SL_2(F)$ generated by unipotent elements

answered Mar 14, 2013 at 23:45

6 votes

Accepted

Kostant's theorem on principal 3-dimensional subalgebras

answered Apr 8, 2013 at 16:15

6 votes

Accepted

Centralizers of nilpotent elements in semisimple Lie algebras

answered Apr 12, 2013 at 22:43

6 votes

Embed one Coxeter System into another

answered Aug 14, 2014 at 19:07

6 votes

Quadratic Casimir of fundamental irreps of simply-laced Lie algebras

answered Jul 2, 2014 at 13:55

6 votes

Accepted

Automorphisms of SO_n(k,f)

answered Jul 30, 2014 at 16:25

6 votes

What are the outer automorphisms of a Coxeter group?

answered Dec 5, 2014 at 18:43

6 votes

volume of compact simple Lie groups under the natural Euclidean embedding

answered Aug 12, 2013 at 10:54

6 votes

How to find faces of polytope defined by a Weyl orbit

answered Dec 22, 2013 at 18:30

Stack Exchange Network

704 Answers

abelian centralizers in almost simple groups

Twisted affine Lie algebras

Applications of the Roggenkamp-Scott theorem ?

Why can I divide an affine variety by the action of the general linear group?

The prime divisors of a simple group

A Realization Problem for Character Tables

reductive group orbits in P(V)?

Software for Borel-Weil-Bott in positive characteristic?

group scheme neither affine, nor an abelian variety

Lists of small groups

When is the Levi subalgebra an ideal?

A question on the root systems of simple Lie algebras in the 90 degree case

Quick easy question - representation theory

What is a (generalized) BN-pair?

f.g. modules vs. f.g. projective modules

algebraic groups and their Lie algebras

"geometric" description of the algebra of central functions on a Lie group

Kostant's theorem about U(g) being free over Z(g) and a corollary of it

center of the centralizer of semisimple element

Lie algebra $\mathfrak{so}(9)$ as a subalgebra of $\mathfrak{f}_4$

Naive question about the representation theory of algebraic groups and hopf algebras

Subgroups of $SL_2(F)$ generated by unipotent elements

Kostant's theorem on principal 3-dimensional subalgebras

Centralizers of nilpotent elements in semisimple Lie algebras

Embed one Coxeter System into another

Quadratic Casimir of fundamental irreps of simply-laced Lie algebras

Automorphisms of SO_n(k,f)

What are the outer automorphisms of a Coxeter group?

volume of compact simple Lie groups under the natural Euclidean embedding

How to find faces of polytope defined by a Weyl orbit