User Ben Webster - MathOverflow

Ben Webster

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Member for 14 years, 6 months
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uwaterloo.ca/scholar/b2webste
Waterloo, ON, Canada

510 Answers

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2 votes

relate parabolic subalgebras to gradings?

answered Dec 28, 2010 at 18:19

2 votes

Accepted

What is a closed orbit that is not separable? (ANSWERED)

answered Sep 13, 2010 at 3:58

2 votes

Is Krull dimension non-increasing along ring epimorphisms?

answered Jan 16, 2011 at 1:36

2 votes

Occurrences of a simple reflection in the longest element of a Weyl group?

answered Mar 20, 2011 at 23:42

2 votes

Does the preimage of the Slodowy slice in $T^*G/P$ have a name?

answered Jun 14, 2011 at 22:32

2 votes

Accepted

Frame bundle of $\mathbb{C}P^n$ as homogeneous space

answered Apr 26, 2023 at 14:13

2 votes

Is there a way to define a Lie derivative of a connection?

answered Oct 15, 2022 at 2:00

2 votes

Derived functor and bi-module

answered Feb 1, 2021 at 1:34

2 votes

Analytic sections of a GIT quotient lying in the Kempf-Ness set

answered Apr 10, 2018 at 19:05

2 votes

Accepted

Is $\mathcal{Ext}^i(F,G)$ the sheafification of $Ext^i(F,G)$?

answered Jun 16, 2017 at 20:17

2 votes

Accepted

Equivariant cohomology defined by restrictions?

answered May 19, 2017 at 14:27

2 votes

Accepted

Is Koszulity equivalent to the Lusztig character formula holding?

answered Apr 14, 2016 at 14:04

2 votes

Inner product on $V_{-\rho}$?

answered Dec 1, 2016 at 13:24

2 votes

Some intuition on the $SL_n$-module $V_{[1,1,...,1]}$

answered Dec 5, 2016 at 14:42

2 votes

Jordan-Holder vs Harder-Narasimhan

answered Sep 10, 2014 at 17:39

2 votes

Plucker embedding and tautological/universal quotient bundle

answered Aug 22, 2014 at 16:37

2 votes

Reduction along an Orbit for C.-M. systems

answered Apr 11, 2014 at 15:24

2 votes

Projective normality of cones over projectively normal varieties

answered Aug 10, 2015 at 17:37

2 votes

Ext groups in the equivariant derived category

answered Jun 16, 2015 at 11:34

2 votes

Accepted

analog of Lusztig nilpotent scheme

answered Mar 9, 2016 at 22:35

2 votes

Pullback of line bundles and existence of divisors representing line bundles

answered Sep 29, 2015 at 2:05

2 votes

Accepted

Graded category O for for rational Cherednik algebras, but at t=0

answered Sep 23, 2015 at 11:45

2 votes

Accepted

Hamiltonian Reduction and Affine quotient

answered Nov 23, 2011 at 4:10

2 votes

Regular Functions on Slodowy Slices

answered Nov 26, 2011 at 20:58

2 votes

Invariant complement to invariant subspace.

answered Jan 15, 2012 at 13:59

2 votes

Accepted

Generators of the derived category

answered Feb 29, 2012 at 5:05

2 votes

Accepted

Action of centralizer on Borel-Moore homology of Springer Fibers for Affine Hecke Algebra

answered Sep 20, 2011 at 22:59

2 votes

Accepted

What is the current status for Lusztig's positivity conjecture for symmetric Cartan datum?

answered Jun 30, 2011 at 2:20

2 votes

Accepted

Fixed points of quantised enveloping algebra for affine $\mathfrak{sl}_n$

answered Oct 5, 2011 at 3:49

2 votes

Accepted

A remark in Jantzen's 'Lectures on Quantum Groups'

answered Sep 6, 2012 at 15:10

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