26

Questions

votes newest views recent

3

13

votes

1

answer

320

views

Second nonabelian group cohomology: cocycles vs. gerbes

ct.category-theory group-cohomology nonabelian-cohomology gerbes

may 11 at 16:36 Mikhail Borovoi 2,632●6●14

2

11

votes

1

answer

776

views

Is -1 a sum of 2 squares in a certain field K?

ac.commutative-algebra polynomials quadratic-forms fields

jun 22 10 at 14:21 Pete L. Clark 39.5k●3●102●225

1

9

votes

3

answers

953

views

Connected components of the orthogonal group O(2n) in characteristic 2.

algebraic-groups

apr 14 10 at 19:29 mark 353●1●7

1

9

votes

4

answers

488

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Algebraic cycles of dimension 2 on the square of a generic abelian surface

ag.algebraic-geometry algebraic-cycles abelian-varieties

apr 21 10 at 15:43 J.C. Ottem 8,588●1●16●45

2

9

votes

3

answers

623

views

Diagonalizable subgroups of a connected linear algebraic group

algebraic-groups

apr 11 11 at 21:52 George McNinch 1,930●1●5●11

2

9

votes

2

answers

333

views

Automorphisms of $SL_n$ as a variety

ag.algebraic-geometry algebraic-groups

jan 15 at 19:45 Jason Starr 1,835●8●14

6

votes

0

answers

229

views

Real approximation for homogeneous spaces of linear algebraic groups

nt.number-theory algebraic-groups galois-cohomology open-problem

dec 28 10 at 15:50 Mikhail Borovoi 2,632●6●14

3

6

votes

2

answers

394

views

What does a homogeneous space of a linear algebraic group know about the group?

ag.algebraic-geometry algebraic-groups lie-groups

feb 24 11 at 18:46 Jim Humphreys 25.9k●37●82

3

6

votes

2

answers

574

views

Mostow’s theorem on algebraic groups

algebraic-groups terminology

sep 19 at 23:15 Jim Humphreys 25.9k●37●82

5

votes

1

answer

208

views

Conjugation of homogeneous spaces

ag.algebraic-geometry at.algebraic-topology algebraic-groups homogeneous-spaces fundamental-group

jan 9 at 16:39 Mikhail Borovoi 2,632●6●14