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16 Questions

Votes Activity Newest Views

votes

answers

257

views

Why the hyperoctahedral group is a ``reductive'' group?

Sep 3 '18 at 19:02 Jim Humphreys 49.3k

votes

answers

114

views

How to decompose cuspidal representations?

rt.representation-theory big-picture

Aug 16 '17 at 16:20 user148212 1,135

votes

answers

252

views

An analogue of Deligne--Lusztig theory for real groups?

rt.representation-theory lie-groups deligne-lusztig-theory

Jan 21 '16 at 9:40 user148212 1,135

votes

answers

256

views

The defining characteristic representations of Lie type groups

rt.representation-theory algebraic-groups

Dec 8 '17 at 0:01 Jim Humphreys 49.3k

votes

answer

417

views

When the longest element of Weyl group is rational?

algebraic-groups weyl-group

Apr 11 '17 at 20:26 Jay Taylor 2,477

votes

answers

240

views

On rational points in an affine space

ag.algebraic-geometry etale-cohomology

Apr 8 '17 at 20:11 user148212 1,135

votes

answers

223

views

When is the etale cohomology of a surface free?

ag.algebraic-geometry etale-cohomology

Jan 11 '18 at 5:36 user148212 1,135

votes

answers

201

views

Varieties with only top $\ell$-adic cohomology not vanish?

ag.algebraic-geometry etale-cohomology

Feb 25 '16 at 21:26 user148212 1,135

votes

answer

357

views

Quotient of a reductive group by a Levi subgroup and locally triviality

algebraic-groups

Feb 19 '16 at 3:13 nfdc23 825

votes

answers

149

views

Weil structures and rational structures on $\overline{\mathbb{Q}}_{\ell}$-sheaves

ag.algebraic-geometry etale-cohomology

Nov 3 '15 at 14:00 user148212 1,135

votes

answer

405

views

Integral model of a reductive group over a prime field

algebraic-groups reductive-groups

Nov 22 '16 at 18:38 nfdc23 825

votes

answer

views

On components of centralisers in unipotent groups

ag.algebraic-geometry algebraic-groups

Jan 30 '20 at 9:45 kneidell 943

votes

answer

183

views

On cuspidal maximal tori of a connected reductive group

rt.representation-theory algebraic-groups deligne-lusztig-theory

May 21 '17 at 14:01 LSpice 5,123

votes

answer

329

views

When is a $\overline{\mathbb{Q}}_{\ell}$-local system the inverse image of a $\overline{\mathbb{Q}}_{\ell}$-local system?

ag.algebraic-geometry algebraic-groups etale-cohomology

Apr 17 '16 at 3:09 Community♦ 1

votes

answer

255

views

A homotopy argument in etale topology

ag.algebraic-geometry etale-cohomology

Mar 11 '16 at 2:56 Will Sawin 87.8k

vote

answers

493

views

Rational structures on the flag variety over a finite field

ag.algebraic-geometry algebraic-groups

Jul 24 '14 at 12:51 S. Carnahan♦ 42k

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16 Questions

Why the hyperoctahedral group is a ``reductive'' group?

How to decompose cuspidal representations?

An analogue of Deligne--Lusztig theory for real groups?

The defining characteristic representations of Lie type groups

When the longest element of Weyl group is rational?

On rational points in an affine space

When is the etale cohomology of a surface free?

Varieties with only top $\ell$-adic cohomology not vanish?

Quotient of a reductive group by a Levi subgroup and locally triviality

Weil structures and rational structures on $\overline{\mathbb{Q}}_{\ell}$-sheaves

Integral model of a reductive group over a prime field

On components of centralisers in unipotent groups

On cuspidal maximal tori of a connected reductive group

When is a $\overline{\mathbb{Q}}_{\ell}$-local system the inverse image of a $\overline{\mathbb{Q}}_{\ell}$-local system?

A homotopy argument in etale topology

Rational structures on the flag variety over a finite field