User Jim Humphreys

3 votes

Quotient of a reductive group by a non-smooth subgroup

answered May 25, 2013 at 18:04

3 votes

What's a good example/reference for cohomology classes on Springer fibers that aren't restricted from the flag variety

answered Aug 1, 2013 at 10:35

3 votes

Accepted

Truncated induction for exceptional cases

answered Sep 18, 2013 at 20:02

3 votes

The number of conjugacy classes of the simple group PSL(2,q)

answered Sep 21, 2013 at 15:57

3 votes

Accepted

irreducible Classical Lie algebras

answered Nov 7, 2013 at 1:05

3 votes

Computation of restricted Lie algebra (co)homology

answered Nov 11, 2013 at 13:08

3 votes

Accepted

Branching rule for classical Lie algebras in positive characteristic

answered Nov 14, 2013 at 20:55

3 votes

Accepted

Character table of $\mathrm{SL}_2(\mathbb{Z}/p^n\mathbb{Z})$

answered Apr 1, 2015 at 18:35

3 votes

Maximal abelian subgroup of general linear groups

answered Mar 18, 2015 at 13:58

3 votes

Accepted

Is an $\mathfrak{sl}_2$-triple determined up to Lie algebra automorphism by the adjoint representation?

answered Mar 25, 2015 at 22:27

3 votes

Is this characterization of (-1)-eigenspaces of the Weyl group of $E_6$ known?

answered Apr 24, 2015 at 17:41

3 votes

What's the most simple proof of Kostant's version of Borel-Weil-Bott for Lie Algebra cohomology?

answered Jun 11, 2015 at 19:47

3 votes

Frequency of a representation of SO(3)

answered Mar 5, 2015 at 14:00

3 votes

Smallest non-trivial conjugacy classes in simple groups and classes of involutions

answered Dec 6, 2014 at 16:33

3 votes

Accepted

What can representations of affine Weyl groups do?

answered Feb 28, 2014 at 14:24

3 votes

Reference for an algebraic group preserving a cubic form

answered May 12, 2014 at 13:02

3 votes

Accepted

Integral representations of groups of small order

answered Jun 4, 2014 at 22:42

3 votes

The cohomology group $H^{1}(GL_{2}(\mathbb{F}_{p}), M_{2}(\mathbb{F}_{p}))$

answered Aug 7, 2014 at 17:52

3 votes

Weight multiplicity formulae for $(\mathfrak g,B)$-irreps

answered Oct 10, 2014 at 18:58

3 votes

Homomorphisms of Lie groups preserving regularity

answered May 8, 2013 at 0:40

3 votes

Is there an almost-direct product decomposition for disconnected reductive algebraic groups?

answered Apr 25, 2013 at 14:03

3 votes

Accepted

Connectedness of Springer Fibers

answered May 7, 2013 at 17:56

3 votes

Accepted

Stabilizers for nilpotent adjoint orbits of semisimple groups

answered Feb 21, 2013 at 12:17

3 votes

Classification of Tori of GL2, up to conjugation

answered Feb 16, 2013 at 16:04

3 votes

Around the socle filtration of a Verma module

answered Jan 6, 2013 at 23:39

3 votes

For $\mathfrak g$ A Lie algebra of type $ E_7 $, $\mathfrak h $ a Cartan subalgebra and $\Delta$ the resulting root system, does $ Aut(\mathfrak g,\mathfrak h)\rightarrow Aut(\Delta) $ split over the Weyl group?

answered Sep 7, 2012 at 23:46

3 votes

Accepted

length function of a coxeter group with respect to two different simple systems are equal or not?

answered Dec 3, 2012 at 19:51

3 votes

Accepted

Kostant's theorem on invariant polynomials in positive characteristic

answered Aug 17, 2012 at 22:18

3 votes

is the subgroup generated by one-parameter unipotent subgroups a Lie subgroup?

answered Mar 31, 2011 at 12:35

3 votes

Accepted

Restricted Lie algebras of low dimension

answered Aug 6, 2011 at 15:48

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704 Answers

Quotient of a reductive group by a non-smooth subgroup

What's a good example/reference for cohomology classes on Springer fibers that aren't restricted from the flag variety

Truncated induction for exceptional cases

The number of conjugacy classes of the simple group PSL(2,q)

irreducible Classical Lie algebras

Computation of restricted Lie algebra (co)homology

Branching rule for classical Lie algebras in positive characteristic

Character table of $\mathrm{SL}_2(\mathbb{Z}/p^n\mathbb{Z})$

Maximal abelian subgroup of general linear groups

Is an $\mathfrak{sl}_2$-triple determined up to Lie algebra automorphism by the adjoint representation?

Is this characterization of (-1)-eigenspaces of the Weyl group of $E_6$ known?

What's the most simple proof of Kostant's version of Borel-Weil-Bott for Lie Algebra cohomology?

Frequency of a representation of SO(3)

Smallest non-trivial conjugacy classes in simple groups and classes of involutions

What can representations of affine Weyl groups do?

Reference for an algebraic group preserving a cubic form

Integral representations of groups of small order

The cohomology group $H^{1}(GL_{2}(\mathbb{F}_{p}), M_{2}(\mathbb{F}_{p}))$

Weight multiplicity formulae for $(\mathfrak g,B)$-irreps

Homomorphisms of Lie groups preserving regularity

Is there an almost-direct product decomposition for disconnected reductive algebraic groups?

Connectedness of Springer Fibers

Stabilizers for nilpotent adjoint orbits of semisimple groups

Classification of Tori of GL2, up to conjugation

Around the socle filtration of a Verma module

For $\mathfrak g$ A Lie algebra of type $ E_7 $, $\mathfrak h $ a Cartan subalgebra and $\Delta$ the resulting root system, does $ Aut(\mathfrak g,\mathfrak h)\rightarrow Aut(\Delta) $ split over the Weyl group?

length function of a coxeter group with respect to two different simple systems are equal or not?

Kostant's theorem on invariant polynomials in positive characteristic

is the subgroup generated by one-parameter unipotent subgroups a Lie subgroup?

Restricted Lie algebras of low dimension