Jim Humphreys's user avatar
Jim Humphreys's user avatar
Jim Humphreys's user avatar
Jim Humphreys
  • Member for 14 years, 1 month
  • Last seen more than 3 years ago
2 votes

Absolutely irreducible representations of affine group schemes of finite type over a field

3 votes

Group cohomology of modular representations for finite groups of Lie type

5 votes
Accepted

History of the study of Verma modules in terms of Kazhdan Lusztig Theory

2 votes
Accepted

Kazhdan–Lusztig polynomials in terms of Ext groups

4 votes

Diagonal automorphisms for twisted Chevalley groups

5 votes

Is the tensor product of two infinite dimensional objects in the BGG category $\mathcal{O}$ of a semisimple Lie algebra always not in $\mathcal{O}$?

7 votes

Weyl's theorem and Representations

1 vote

Reflection reverses a root string

3 votes

Nilpotent elements of Lie algebra and unipotent groups

1 vote

Weight spaces of representations of finite dimensional simple Lie algebras

7 votes
Accepted

For $G$ an adjoint Chevalley group, are all of $G(\mathbb Z)$'s finite-index subgroups congruence subgroups?

8 votes

Misspelling my name on my mathematical publications

3 votes

How to prove that Chevalley groups over $\mathbb R$ have no compact factors

0 votes

Cyclic vectors in irreducible representations of simple Lie algebras

2 votes

Character of a semisimple connected Lie groups

2 votes

Coordinates of the Weyl vector of $E_8$ (and the 135 classes of $W(E_8)/W(D_8)$)

3 votes
Accepted

Distance between Verma modules in certain "strongly" standard filtrations

3 votes

Computing Deligne-Lusztig Characters in General

2 votes

Well-definedness of translation functor

5 votes

Existence of a weight of a representation in the fundamental Weyl chamber

4 votes

Problem based representation theory book

4 votes

Indecomposable, non-simple, modules of quantum groups at roots of unity

2 votes

Is the size of a conjugacy class in a finite classical group a polynomial?

1 vote

Regular semisimple elements in $SL(n,q)$

2 votes
Accepted

Decomposition of parabolic subgroup in reductive group

1 vote

Verma modules in category $\mathcal{O}^\mathfrak{p}$

2 votes
Accepted

Element in finite number of Borel subgroups

5 votes

Reference Request: Structure constants for G2

4 votes
Accepted

Conjugacy classes of symplectic group $\mathrm{Sp}(4,q)$

2 votes

Extensions of modules over universal enveloping algebra with fixed central action

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