User Jim Humphreys

4 votes

Accepted

Matrix from a homomorphism of simply connected groups

answered Aug 3, 2015 at 20:54

4 votes

highest weight the half-sum of positive roots

answered Jul 23, 2015 at 21:30

4 votes

Weyl group elements fixing a set of simple roots

answered Nov 22, 2016 at 20:37

4 votes

Maps between symmetric powers of the natural module for $SL_2 (k)$ in prime characteristic

answered Jul 20, 2016 at 21:59

4 votes

Accepted

Question on irreducible representation of tensor products

answered Mar 30, 2017 at 21:07

4 votes

Is the Cartan matrix of a finite-dimensional (Hopf) algebra invertible over the rationals?

answered Feb 3, 2017 at 18:11

4 votes

the character tables of irreducible representations of $SL(3,Z_q)$

answered Mar 10, 2017 at 1:33

4 votes

The Analog of Borel Subgroup in a Compact Real Form

answered Mar 16, 2017 at 20:03

4 votes

Technical lemma on root systems, reduced to linear algebra

answered Jan 20, 2017 at 15:11

4 votes

on a property of minuscules in weight lattice

answered Feb 6, 2017 at 1:22

4 votes

What does a homogeneous space of a linear algebraic group know about the group?

answered Feb 24, 2011 at 18:46

4 votes

Conjugacy class of a full Jordan block over integers

answered Jan 22, 2011 at 23:23

4 votes

Minimal dimension of maximal abelian subalgebras

answered Dec 13, 2010 at 19:05

4 votes

Accepted

unipotent groups, their forms and representations

answered Oct 4, 2010 at 21:43

4 votes

Classification of (compact) Lie groups

answered Feb 24, 2010 at 23:38

4 votes

Can we bound degrees of complex irreps in terms of the average conjugacy class size?

answered Apr 12, 2010 at 12:04

4 votes

Accepted

Errata for Emil Artin's 'The Gamma Function'?

answered Apr 4, 2010 at 14:16

4 votes

How to find more (finite almost simple) groups with a given Sylow subgroup

answered May 9, 2010 at 14:00

4 votes

A place to find original papers

answered May 17, 2010 at 17:45

4 votes

Getting the Weyl dimension formula geometrically

answered Jul 13, 2010 at 11:42

4 votes

Accepted

Simplicity of (complex) orthogonal groups

answered Jun 21, 2010 at 20:40

4 votes

Possible Borel subgroups of GL_n?

answered Nov 20, 2011 at 23:31

4 votes

query about Jacques Tits' "Uniqueness and Presentation of Kac-Moody groups over fields"

answered Nov 24, 2011 at 15:18

4 votes

BGG resolution and representations of parabolic subalgebras

answered Nov 26, 2011 at 18:51

4 votes

Indecomposable projectives correspond to irreducibles - reference

answered Dec 21, 2011 at 21:47

4 votes

Littelmann path operators for an arbitrary positive root

answered Dec 25, 2011 at 20:52

4 votes

Weight lattice and the fundamental group

answered Feb 3, 2012 at 20:52

4 votes

The relation of nilpotent orbits and simple singularities, for orbits smaller than subregular ones

answered Jan 21, 2012 at 17:00

4 votes

About $G$-modules versus $Lie(G)$-modules for algebraic groups

answered Feb 26, 2012 at 22:24

4 votes

Accepted

Is the derived group of $G_2$ simply connected?

answered May 15, 2012 at 23:11

Stack Exchange Network

704 Answers

Matrix from a homomorphism of simply connected groups

highest weight the half-sum of positive roots

Weyl group elements fixing a set of simple roots

Maps between symmetric powers of the natural module for $SL_2 (k)$ in prime characteristic

Question on irreducible representation of tensor products

Is the Cartan matrix of a finite-dimensional (Hopf) algebra invertible over the rationals?

the character tables of irreducible representations of $SL(3,Z_q)$

The Analog of Borel Subgroup in a Compact Real Form

Technical lemma on root systems, reduced to linear algebra

on a property of minuscules in weight lattice

What does a homogeneous space of a linear algebraic group know about the group?

Conjugacy class of a full Jordan block over integers

Minimal dimension of maximal abelian subalgebras

unipotent groups, their forms and representations

Classification of (compact) Lie groups

Can we bound degrees of complex irreps in terms of the average conjugacy class size?

Errata for Emil Artin's 'The Gamma Function'?

How to find more (finite almost simple) groups with a given Sylow subgroup

A place to find original papers

Getting the Weyl dimension formula geometrically

Simplicity of (complex) orthogonal groups

Possible Borel subgroups of GL_n?

query about Jacques Tits' "Uniqueness and Presentation of Kac-Moody groups over fields"

BGG resolution and representations of parabolic subalgebras

Indecomposable projectives correspond to irreducibles - reference

Littelmann path operators for an arbitrary positive root

Weight lattice and the fundamental group

The relation of nilpotent orbits and simple singularities, for orbits smaller than subregular ones

About $G$-modules versus $Lie(G)$-modules for algebraic groups

Is the derived group of $G_2$ simply connected?