Torsten Ekedahl's user avatar
Torsten Ekedahl's user avatar
Torsten Ekedahl's user avatar
Torsten Ekedahl
  • Member for 14 years, 1 month
17 votes

Why torsion is important in (co)homology ?

17 votes
Accepted

Is the Characteristic of a Field Detectable from the Topology of a Topological Vector Space?

17 votes

What about the empty torsor?

17 votes
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Uniqueness of splitting field for linear representations of finite groups

16 votes
Accepted

Is formal smoothness a local property?

16 votes
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Is every homogeneous G-variety of the form G/H?

16 votes
Accepted

Unipotency in realisations of the motivic fundamental group

16 votes
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Finiteness property of automorphism scheme

16 votes
Accepted

Where can I easily look up / calculate (abelian) group cohomology?

16 votes
Accepted

Projective variety with no syzygies but not isomorphic to projective space

15 votes
Accepted

Complex vector bundles with trivial Chern classes on k-tori

15 votes
Accepted

Is the Grothendieck ring of varieties reduced?

15 votes
Accepted

Is a polynomial group law on $\mathbb{R}^n$ automatically nilpotent?

15 votes

Confusion over a point in basic category theory

15 votes
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$Sq^1$ cohomology of spaces

15 votes
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Obstructions to formally integrating vector fields in characteristic p?

14 votes
Accepted

Central extensions of group schemes

14 votes

line bundles on smooth affine variety

14 votes

What is a "block" in an abelian category?

14 votes
Accepted

What information does the completion of a stalk at its maximal ideal give us in the holomorphic, analytic, or algebraic cases?

14 votes
Accepted

Complex manifolds where bounded holomorphic functions are constant

14 votes
Accepted

Injection of Ext into H^2

14 votes
Accepted

Is every projective space bundle locally trivial in the Zariski topology?

14 votes
Accepted

Why is a general curve automorphism-free?

13 votes

The dual group of $\mathbb Q$

13 votes

Extra automorphisms of curves and definability over \bar Q

13 votes
Accepted

Binary Quadratic Forms in Characteristic 2

13 votes
Accepted

Is this a definition of equivariant derived category?

13 votes

Simplest example of jumping of cohomology of structure sheaf in smooth families?

12 votes

Torsion for Lie algebras and Lie groups

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