User Jim Humphreys

11 votes

A possible mistake in Kac's "Infinite Dimensional Lie Algebras"

answered Jul 29, 2012 at 15:25

11 votes

When k[G/H] is multiplicity free G module ?

answered Aug 18, 2012 at 19:57

11 votes

When are all centralizers in a Lie group connected?

answered Mar 25, 2012 at 14:35

11 votes

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Cartan Matrices of type B and C.

answered Jan 29, 2012 at 14:49

11 votes

Irreducibility of Induced Representation over arbitrary field

answered Dec 29, 2011 at 14:26

11 votes

Accepted

Does -I belong to Weyl group?

answered Nov 25, 2011 at 15:29

11 votes

Iwasawa Decomposition & Polar Decomposition related how ?

answered Oct 18, 2010 at 17:25

11 votes

Accepted

theorem of Borel and Tits

answered Jul 26, 2010 at 10:51

11 votes

Suzuki and Ree groups, from the algebraic group standpoint

answered Jul 29, 2010 at 20:48

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On Category O in positive characteristic

answered Jun 27, 2010 at 17:18

11 votes

Is there an index for solutions to American Mathematical Monthly problems?

answered Jun 6, 2010 at 21:32

11 votes

Published results: when to take them for granted?

answered May 6, 2010 at 18:46

11 votes

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Faithful projective representations of symmetric groups

answered Oct 29, 2015 at 14:41

10 votes

Why study Higher Sheaf Cohomology?

answered Oct 25, 2016 at 13:36

10 votes

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What is Borel-de Siebenthal theory?

answered Jun 20, 2010 at 20:19

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Representations of finite Coxeter groups

answered Jul 14, 2010 at 16:38

10 votes

Recovering representation from its character

answered Jul 21, 2010 at 21:01

10 votes

What's the origin of the naming convention for the standard basis of $\mathfrak{sl}_2(\mathbb{C}) $?

answered Mar 11, 2010 at 16:41

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What information is contained in the Kazhdan-Lusztig polynomials?

answered Nov 16, 2011 at 0:39

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What does the t in t-category stand for?

answered Feb 5, 2012 at 22:47

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Irreps which aren't highest-weight modules.

answered Apr 23, 2012 at 17:58

10 votes

Reference request for projective representations of finite groups over a non-problematic field

answered May 10, 2011 at 16:40

10 votes

Cohomology of $SL_2(\mathbb{F}_p)$ acting on trace zero matrices over $\mathbb{F}_p$

answered Oct 13, 2011 at 13:49

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Is the Gelfand-Graev character isomorphic to a cohomology group for some sheaf on a Deligne-Lusztig variety?

answered Nov 6, 2011 at 14:54

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"Résumé de cours" by Jacques Tits

answered Mar 18, 2011 at 15:22

10 votes

Are there "unsociable" irreps? (Definition inside)

answered Aug 14, 2012 at 18:04

10 votes

Reference for representations of quaternion group

answered Oct 16, 2012 at 12:18

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Commutator of algebraic subgroups is connected

answered Sep 2, 2012 at 16:20

10 votes

Motivational ideas for the Gelfand-Graev character of a finite group of Lie type

answered Mar 14, 2015 at 14:01

10 votes

Accepted

Dimensions and number of complex irreducible representations for SL3(Z/pZ)

answered Sep 9, 2013 at 0:10

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704 Answers

A possible mistake in Kac's "Infinite Dimensional Lie Algebras"

When k[G/H] is multiplicity free G module ?

When are all centralizers in a Lie group connected?

Cartan Matrices of type B and C.

Irreducibility of Induced Representation over arbitrary field

Does -I belong to Weyl group?

Iwasawa Decomposition & Polar Decomposition related how ?

theorem of Borel and Tits

Suzuki and Ree groups, from the algebraic group standpoint

On Category O in positive characteristic

Is there an index for solutions to American Mathematical Monthly problems?

Published results: when to take them for granted?

Faithful projective representations of symmetric groups

Why study Higher Sheaf Cohomology?

What is Borel-de Siebenthal theory?

Representations of finite Coxeter groups

Recovering representation from its character

What's the origin of the naming convention for the standard basis of $\mathfrak{sl}_2(\mathbb{C}) $?

What information is contained in the Kazhdan-Lusztig polynomials?

What does the t in t-category stand for?

Irreps which aren't highest-weight modules.

Reference request for projective representations of finite groups over a non-problematic field

Cohomology of $SL_2(\mathbb{F}_p)$ acting on trace zero matrices over $\mathbb{F}_p$

Is the Gelfand-Graev character isomorphic to a cohomology group for some sheaf on a Deligne-Lusztig variety?

"Résumé de cours" by Jacques Tits

Are there "unsociable" irreps? (Definition inside)

Reference for representations of quaternion group

Commutator of algebraic subgroups is connected

Motivational ideas for the Gelfand-Graev character of a finite group of Lie type

Dimensions and number of complex irreducible representations for SL3(Z/pZ)