User Jim Humphreys

85 votes

Motivating the Casimir element

answered Sep 7, 2011 at 22:46

51 votes

Books you would like to read (if somebody would just write them…)

answered Jan 30, 2011 at 18:29

48 votes

Fraktur symbols for Lie algebras

answered Mar 1, 2012 at 23:27

47 votes

Accepted

What is significant about the half-sum of positive roots?

answered Nov 5, 2011 at 22:38

45 votes

Fields of mathematics that were dormant for a long time until someone revitalized them

answered May 11, 2010 at 17:41

39 votes

Pseudonyms of famous mathematicians

answered Nov 7, 2010 at 21:03

39 votes

Accepted

Rep Theory Consequences of Bott--Weil--Borel

answered Feb 6, 2013 at 18:23

31 votes

How might M.C. Escher have designed his patterns?

answered Jan 1, 2011 at 18:39

30 votes

Facts from algebraic geometry that are useful to non-algebraic geometers

answered Aug 23, 2010 at 19:27

29 votes

Why aren't representations of monoids studied so much?

answered Aug 30, 2010 at 13:21

28 votes

Accepted

About unpublished lecture notes of Philip Hall

answered Mar 19, 2012 at 10:57

25 votes

Accepted

Why are affine Lie algebras called affine?

answered May 19, 2013 at 16:18

24 votes

Accepted

What to do now that Lusztig's and James' conjectures have been shown to be false?

answered Aug 6, 2013 at 21:09

24 votes

Accepted

Should I become a Mathscinet reviewer?

answered Jun 25, 2012 at 14:25

23 votes

Isomorphic general linear groups implies isomorphic fields?

answered Sep 10, 2012 at 20:05

22 votes

Accepted

Lie algebras of algebraic groups

answered May 5, 2011 at 0:11

22 votes

Is there a Morse theory proof of the Bruhat decomposition?

answered Jun 18, 2010 at 13:18

22 votes

Accepted

Cohomology of Flag Varieties

answered Apr 17, 2010 at 11:48

22 votes

Accepted

On the full reducibility of representations of reductive Lie algebras

answered Apr 30, 2010 at 10:44

21 votes

Accepted

Why the BGG category O?

answered May 13, 2011 at 20:51

20 votes

Never appeared forthcoming papers

answered Dec 6, 2010 at 22:05

20 votes

Why are $S$-arithmetic groups interesting?

answered Sep 9, 2012 at 11:32

20 votes

Accepted

Small-index subgroups of SL(3,Z)

answered Feb 25, 2013 at 18:10

19 votes

Weyl group actions on 0-weight spaces

answered Oct 30, 2014 at 23:43

19 votes

What is modular representation theory for groups good for?

answered Jan 20, 2015 at 22:35

19 votes

Accepted

Complex root systems

answered Dec 11, 2010 at 15:08

18 votes

Accepted

Low dimensional nilpotent Lie algebras

answered Apr 12, 2010 at 16:29

18 votes

When and why did the postdoctoral position originate?

answered Mar 4, 2010 at 15:10

18 votes

Accepted

Representation theory of the general linear group over a finite prime field

answered Nov 17, 2014 at 13:50

18 votes

Accepted

Why are they called Specht Modules?

answered Feb 17, 2014 at 22:54

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704 Answers

Motivating the Casimir element

Books you would like to read (if somebody would just write them…)

Fraktur symbols for Lie algebras

What is significant about the half-sum of positive roots?

Fields of mathematics that were dormant for a long time until someone revitalized them

Pseudonyms of famous mathematicians

Rep Theory Consequences of Bott--Weil--Borel

How might M.C. Escher have designed his patterns?

Facts from algebraic geometry that are useful to non-algebraic geometers

Why aren't representations of monoids studied so much?

About unpublished lecture notes of Philip Hall

Why are affine Lie algebras called affine?

What to do now that Lusztig's and James' conjectures have been shown to be false?

Should I become a Mathscinet reviewer?

Isomorphic general linear groups implies isomorphic fields?

Lie algebras of algebraic groups

Is there a Morse theory proof of the Bruhat decomposition?

Cohomology of Flag Varieties

On the full reducibility of representations of reductive Lie algebras

Why the BGG category O?

Never appeared forthcoming papers

Why are $S$-arithmetic groups interesting?

Small-index subgroups of SL(3,Z)

Weyl group actions on 0-weight spaces

What is modular representation theory for groups good for?

Complex root systems

Low dimensional nilpotent Lie algebras

When and why did the postdoctoral position originate?

Representation theory of the general linear group over a finite prime field

Why are they called Specht Modules?