MathOverflow will be down for maintenance for approximately 3 hours, starting Monday evening (06/24/2013) at approximately 9:00 PM Eastern time (UTC-4).

Jim Humphreys

26,444
Reputation
12393 views
Is this your account?

Registered User 

Name Jim Humphreys
Member for 3 years
Seen 2 days ago
Website
Location U. Massachusetts, Amherst
Age 73
More-or-less retired professor at UMass Amherst. Basically an algebraist with interests in Lie theory, specifically representation theory and related algebraic geometry.
49

Questions
votes newest views recent
22
44
votes
9
answers
4k
views

What are “classical groups”?

dec 8 11 at 13:52 Alain Valette 6,469●14●26

12

11

13

11

5

5
18
votes
5
answers
2k
views

Is there a reasonable way to refer to a 23 page article with 28 authors?

oct 15 10 at 13:09 Wadim Zudilin 8,694●1●24●59

3

6
17
votes
4
answers
2k
views

How did “Ore’s Conjecture” become a conjecture?

oct 21 11 at 18:45 Jim Humphreys 26.4k●38●87

4

1 2 3 4 5 next

 

424

Answers
votes newest views recent
39
Motivating the Casimir element
25
Fields of mathematics that were dormant for a long time until someone revitalized them
24
Rep Theory Consequences of Bott--Weil--Borel
22
Books you would like to read (if somebody would just write them…)
21
Facts from algebraic geometry that are useful to non-algebraic geometers (2)
20
Pseudonyms of famous mathematicians
19
How might M.C. Escher have designed his patterns?
19
What is significant about the half-sum of positive roots?
18
Fraktur symbols for Lie algebras: $\mathfrak{g}$, etc.
18
Is there a Morse theory proof of the Bruhat decomposition?
17
Never appeared forthcoming papers
17
Why aren’t representations of monoids studied so much?
16
Isomorphic general linear groups implies isomorphic fields?
15
Reference for representation theory of SL_2(Z/n)
15
About unpublished lecture notes of Philip Hall
15
Lie algebras of algebraic groups
14
Abstract Jordan Decomposition different from usual Jordan Decomposition
13
how to find the varieties whose cohomology realizes certain representations?
13
When and why did the postdoctoral position originate?
13
Cohomology of Flag Varieties
13
Small index subgroups of SL(3,Z)
13
Borel’s Paris Lectures
13
Why are affine Lie algebras called affine?
12
Why are $S$-arithmetic groups interesting?
12
Should I become a Mathscinet reviewer?
12
Do semisimple algebraic groups always have faithful irreducible representations?
12
On the full reducibility of representations of reductive Lie algebras
12
Polynomial invariants of the exceptional Weyl groups
12
Gap in an argument in Fulton & Harris?
12
Connectedness of Centralizers in $GL_n$
1 2 3 4 5 … 15 next

 

1355

Votes
1338
17

 

160

Tags
× 209
× 131
× 111
× 106
× 89
× 74
× 73
× 40
× 17
× 14
 × 13
× 12
× 12
× 12
× 11
× 10
× 10
× 9
× 9
× 8
 × 8
× 8
× 7
× 6
× 6
× 5
× 5
× 5
× 5
× 5
 × 4
× 4
× 4
× 4
× 4
× 4
× 4
× 4
× 4
× 3
 × 3
× 3
× 3
× 3
× 3
× 3
× 3
× 3
× 3
× 3

 

125

Badges
● Nice Answer× 47
● Popular Question× 8
● Enlightened× 13
● Nice Question× 22
● gr.group-theory
 ● Necromancer× 9
● Yearling× 3
● Good Question× 4
● algebraic-groups
● lie-algebras
 ● Good Answer× 2
● Notable Question× 2
● rt.representation-theory
● Mortarboard
● Organizer
 ● Civic Duty
● Scholar
● Critic
● Commentator
● Student
 ● Editor
● Autobiographer
● Supporter
● Teacher