Allen Knutson's user avatar
Allen Knutson's user avatar
Allen Knutson's user avatar
Allen Knutson
  • Member for 14 years, 5 months
  • Last seen this week
146 votes

Geometric interpretation of trace

89 votes

What should be learned in a first serious schemes course?

87 votes

Why aren't representations of monoids studied so much?

71 votes

What are your favorite instructional counterexamples?

33 votes
Accepted

Figure out the roots from the Dynkin diagram

33 votes
Accepted

Why "Classification" of 4 manifolds is NOT possible?

31 votes
Accepted

Why do Littlewood-Richardson coefficients describe the cohomology of the Grassmannian?

30 votes

What should be learned in a first serious schemes course?

25 votes

How much reading do you do before you attack a problem?

24 votes

Peter-Weyl vs. Schur-Weyl theorem

23 votes
Accepted

Finite subgroups of ${\rm SL}_2(\mathbb{Z})$ (reference request)

23 votes

Jokes in the sense of Littlewood: examples?

23 votes

What is the relationship between integrable systems and toric degenerations?

22 votes

Cohomology of Flag Varieties

22 votes

Rep Theory Consequences of Bott--Weil--Borel

22 votes

Longest element of Weyl groups

21 votes

Algebraic geometry used "externally" (in problems without obvious algebraic structure).

20 votes

Examples of common false beliefs in mathematics

20 votes
Accepted

deformation to the normal cone

20 votes

Suggestions for good notation

20 votes

Unifying Geometry for Characteristic Classes

19 votes

What should be learned in a first serious schemes course?

18 votes

What are your favorite puzzles/toys for introducing new mathematical concepts to students?

18 votes
Accepted

Oriention-Reversing Diffeomorphisms of a Manifold

18 votes

cohomology of BG, G compact Lie group

18 votes
Accepted

Proving Positivity for Schubert Calculus

18 votes

Why study Higher Sheaf Cohomology?

17 votes

Reference request: Grassmannian and Plucker coordinates in type B, C, D

17 votes

Where do surreal numbers come from and what do they mean?

17 votes

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

1
2 3 4 5
10