27

Answers
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1
gluing gerbes over a spectrum of a field
1
on z-extensions
5
What are the symmetries of a principal homogeneous bundle?
3
Non-trivial representation of second-smallest dimension
3
Transitive action on the sphere
1
Conjugation of homogeneous spaces
18
Isomorphic general linear groups implies isomorphic fields?
1
Structure of abelian connected complex linear algebraic groups?
13
Cayley Transform for all reductive groups a.k.a an algebraic logarithm
2
density in SU(2,1)
5
Proper compact connected subgroup of $Spin(n)$
2
A kind of orthogonal subtorus
3
Exact sequence of Weyl groups
2
Existence of a bounded finitely generated torsion-free resolution
9
In a compact lie group, can two closed connected subgroups generate a non-closed subgroup?
5
Are units of rings of functions on algebraic varieties finitely generated (mod. constants)?
5
different Shimura data with common underlying group?
4
Principal bundles over groups
5
Deligne’s letter to Piatetskii-Shapiro from 1973
12
Existence of zero cycles of degree one vs existence of rational points
2
Quotient space of $\mathbb{C}^5$ under the action of $SL(2,\mathbb{C})$
4
The algebraic fundamental group of a reductive algebraic group
3
Diophantine equation with no integer solutions, but with solutions modulo every integer
2
Elementary reference for algebraic groups
2
Reference for Pic(G) and central extensions.
5
Splitting of a division algebra with an involution of second kind
2
Galois cohomology of linear groups over local fields