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14 Questions

Votes Activity Newest Views

votes

answers

views

Outer automorphisms of simple Lie Algebras

lie-algebras

Jan 7 '16 at 16:22 janmarqz 335

votes

answers

views

Abelianization of a semidirect product

gr.group-theory

Nov 17 at 19:57 Liddo 149

votes

answers

858

views

Why do we see SU(2,R) in the Local automorphic Langlands group?

nt.number-theory langlands-conjectures

Jul 9 '11 at 19:31 David Hansen 11.8k

votes

answers

382

views

Taking roots in simple linear algebraic groups

algebraic-groups

Feb 10 '10 at 15:20 Kevin McGerty 2,801

votes

answer

797

views

Chopping up Dynkin diagrams

ag.algebraic-geometry algebraic-groups

Jun 18 '15 at 11:16 Oscar 153

votes

answers

262

views

When are all characteristic l representations liftable

rt.representation-theory

Feb 5 '14 at 20:19 Marty Isaacs 5,869

votes

answer

472

views

obstruction to taking the square root of a Galois character

nt.number-theory

Aug 25 '10 at 4:44 Emerton 53.4k

votes

answer

533

views

What is the minimum number of independent sets for a graph with fixed numbers of vertices and edges?

co.combinatorics extremal-graph-theory extremal-combinatorics

May 18 '16 at 22:49 Yufei Zhao 826

votes

answers

644

views

Can every Galois character phi with phi phi^c = 1 be written as psi/psi^c?

nt.number-theory

Aug 26 '10 at 4:13 BCnrd 6,448

votes

answers

515

views

If split algebraic groups are potentially isomorphic, are they isomorphic?

algebraic-groups

Feb 25 '10 at 16:25 Guntram 3,978

votes

answer

views

If we take a small subset of a sparse/uniform set system, how uniform can we arrange for the subset to be?

co.combinatorics extremal-combinatorics

Mar 8 '18 at 19:11 blt 1,073

votes

answer

461

views

Automorphism of algebraic group preserving a hyperspecial maximal compact

ag.algebraic-geometry algebraic-groups nt.number-theory

May 27 '10 at 3:42 JS Milne 7,686

votes

answer

312

views

Hyperspecial subgroup of a product of semisimple algebraic groups

algebraic-groups nt.number-theory

Feb 13 '10 at 18:21 blt 1,073

votes

answer

290

views

Image of a hyperspecial subgroup hyperspecial?

algebraic-groups

Feb 12 '10 at 23:43 Kevin Buzzard 37.2k

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14 Questions

Outer automorphisms of simple Lie Algebras

Abelianization of a semidirect product

Why do we see SU(2,R) in the Local automorphic Langlands group?

Taking roots in simple linear algebraic groups

Chopping up Dynkin diagrams

When are all characteristic l representations liftable

obstruction to taking the square root of a Galois character

What is the minimum number of independent sets for a graph with fixed numbers of vertices and edges?

Can every Galois character phi with phi phi^c = 1 be written as psi/psi^c?

If split algebraic groups are potentially isomorphic, are they isomorphic?

If we take a small subset of a sparse/uniform set system, how uniform can we arrange for the subset to be?

Automorphism of algebraic group preserving a hyperspecial maximal compact

Hyperspecial subgroup of a product of semisimple algebraic groups

Image of a hyperspecial subgroup hyperspecial?