User Mikhail Borovoi

2 votes

2 answers

381 views

Constructing a stack (gerbe) from a connected groupoid

asked Apr 14, 2013 at 13:09

2 votes

0 answers

123 views

What is classified by $H^1(\mathbb{R},SO(p,q))$ and by $H^1(\mathbb{R},SU(p,q))$?

asked Jul 3, 2014 at 12:33

2 votes

2 answers

281 views

Witt index of the sum of 24 squares

asked Oct 17, 2014 at 12:03

2 votes

0 answers

317 views

A homomorphism in the long exact sequence of a fibration for a homogeneous space of a Lie group

asked Apr 27, 2015 at 12:20

2 votes

0 answers

105 views

Conjugacy classes of involutions in Kac-Moody groups

asked Nov 4, 2015 at 19:45

2 votes

2 answers

199 views

Permutation covering of a $G$-lattice

asked Jun 25, 2015 at 16:32

2 votes

0 answers

321 views

Surjective homomorphisms of non-connected Lie groups

asked Feb 14, 2017 at 13:39

1 vote

1 answer

149 views

Morphisms of the spherical data of spherical homogeneous spaces

asked Sep 28, 2016 at 5:12

1 vote

1 answer

211 views

Notation for the restriction map in Galois cohomology

asked Nov 14, 2017 at 21:30

1 vote

1 answer

192 views

Involutive automorphisms of a finite abelian p-group

asked Aug 3, 2015 at 12:06

1 vote

1 answer

350 views

Non-representability by a binary quadratic form

asked Jun 6, 2010 at 13:18

1 vote

0 answers

70 views

A possible generalization of Brauer's theorem about the prime factors of the period and index of a central simple algebra

asked Apr 6 at 10:01

1 vote

1 answer

233 views

Transfer for the group of coinvariants: a reference request

asked Dec 25, 2023 at 14:31

1 vote

0 answers

58 views

Normality in a tower of cyclic extensions of global fields, as in Artin-Tate

asked Feb 29 at 16:50

1 vote

1 answer

188 views

Decomposition groups for the Galois module $\mu_8$

asked Mar 31, 2023 at 17:19

1 vote

0 answers

161 views

Computer computation of the first Galois cohomology of a $p$-adic torus?

asked Jun 22 at 11:45

1 vote

1 answer

224 views

Taking quotient of a variety by the additive group

asked Apr 29, 2021 at 16:09

1 vote

0 answers

165 views

Inflation in degrees $0$, $-1$, and $-2$ for Tate cohomology of finite groups

asked Nov 20, 2021 at 12:46

1 vote

0 answers

97 views

A duality of finite groups coming from a surjective homomorphism with finite kernel of algebraic tori

asked Jan 29, 2023 at 15:36

1 vote

0 answers

116 views

Example of a spherical homogeneous space $G/H$ with a pairs of colors and with the center of $G$ not contained in $H$?

asked Feb 4, 2019 at 17:12

1 vote

0 answers

229 views

The group of global sections of the automorphism bundle of the tangent bundle on a Grassmannian

asked May 9, 2020 at 13:59

0 votes

1 answer

434 views

Reference request: Any connected Lie group has a countable base for its topology

asked Feb 15, 2017 at 16:59

Stack Exchange Network

142 Questions

Constructing a stack (gerbe) from a connected groupoid

What is classified by $H^1(\mathbb{R},SO(p,q))$ and by $H^1(\mathbb{R},SU(p,q))$?

Witt index of the sum of 24 squares

A homomorphism in the long exact sequence of a fibration for a homogeneous space of a Lie group

Conjugacy classes of involutions in Kac-Moody groups

Permutation covering of a $G$-lattice

Surjective homomorphisms of non-connected Lie groups

Morphisms of the spherical data of spherical homogeneous spaces

Notation for the restriction map in Galois cohomology

Involutive automorphisms of a finite abelian p-group

Non-representability by a binary quadratic form

A possible generalization of Brauer's theorem about the prime factors of the period and index of a central simple algebra

Transfer for the group of coinvariants: a reference request

Normality in a tower of cyclic extensions of global fields, as in Artin-Tate

Decomposition groups for the Galois module $\mu_8$

Computer computation of the first Galois cohomology of a $p$-adic torus?

Taking quotient of a variety by the additive group

Inflation in degrees $0$, $-1$, and $-2$ for Tate cohomology of finite groups

A duality of finite groups coming from a surjective homomorphism with finite kernel of algebraic tori

Example of a spherical homogeneous space $G/H$ with a pairs of colors and with the center of $G$ not contained in $H$?

The group of global sections of the automorphism bundle of the tangent bundle on a Grassmannian

Reference request: Any connected Lie group has a countable base for its topology