Torsten Ekedahl

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Name	Torsten Ekedahl
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Torsten Ekedahl (1955-2011)

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Abundance for algebraic surfaces

ag.algebraic-geometry algebraic-surfaces

nov 5 10 at 2:21 roy smith 4,871●34●28

202

Answers

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Why worry about the axiom of choice?

From Zeta Functions to Curves

Which groups have only real and quaternionic irreducible representations?

Separable and algebraic closures?

Is there a machinery describing all the irreducible representations ?

Symmetric powers and duals of vector bundles in char p

Simplest example of jumping of cohomology of structure sheaf in smooth families? (2)

How does Tate verify his own conjecture for the Fermat hypersurface?

“Largest” finite-dimensional Lie subgroups of Diff(S^n), are they known?

Why are normal crossing divisors nice?

The role of completeness in Hilbert Spaces

What do coherent topoi have to do with completeness?

Which ‘well-known’ algebraic geometric results do not hold in characteristic 2?

Motivic characterization of affine spaces

What are some fundamental “sources” for the appearance of pi in mathematics?

extensions, abelian varieties, $\mathbb{G}_m$

Is $Sym^n (V^*) \cong Sym^n (V)^\ast$ naturally in positive characteristic?

Analogue of Smith normal form for matrices over $\mathbb Z[t]$

What is the wild fundamental group?

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

projective module

What about the empty torsor?

Automorphism group of a scheme

Central extensions of group schemes

Finiteness property of automorphism scheme

Confusion over a point in basic category theory

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

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

Torsors for finite group schemes

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

93

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93

146

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rt.representation-theory× 16
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gr.group-theory× 16
ac.commutative-algebra× 15
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characteristic-p× 11
algebraic-groups× 11
reference-request× 10

homological-algebra× 10
ct.category-theory× 9
linear-algebra× 8
ra.rings-and-algebras× 7
lie-algebras× 7
etale-cohomology× 5
noncommutative-algebra× 4
lie-groups× 4
group-cohomology× 4
gn.general-topology× 4

elliptic-curves× 4
cv.complex-variables× 4
complex-geometry× 4
algebraic-curves× 4
vector-bundles× 3
soft-question× 3
polynomials× 3
invariant-theory× 3
intuition× 3
hopf-algebras× 3

homotopy-theory× 3
homology× 3
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group-schemes× 3
divisors× 3
dg.differential-geometry× 3
derived-category× 3
coherent-sheaves× 3
algebraic-surfaces× 3
abelian-varieties× 3

topos-theory× 2
terminology× 2
symmetric-algebras× 2
singularity-theory× 2
sheaf-theory× 2
set-theory× 2
motives× 2
monoidal-categories× 2
matrices× 2
loop-spaces× 2

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