User Torsten Ekedahl

9 votes

structure of the variety of normal matrices

answered Nov 5, 2011 at 8:17

9 votes

Accepted

every involution of an Enriques surface is

answered Sep 1, 2011 at 4:12

8 votes

Accepted

Brauer group of complete DVR

answered Oct 19, 2011 at 4:35

8 votes

Canonical liftings of endomorphisms of ordinary abelian varieties

answered Aug 28, 2011 at 5:00

8 votes

On the cohomology of a finite covering map

answered Mar 2, 2011 at 6:03

8 votes

Accepted

Presentation of the dual of a locally free sheaf

answered Jul 24, 2011 at 9:12

8 votes

Characterization of locally free modules via exterior powers

answered Jul 19, 2011 at 12:36

8 votes

Accepted

Is there a presentation of the cohomology of the moduli stack of torsion sheaves on an elliptic curve?

answered Mar 14, 2010 at 17:11

8 votes

Accepted

Liftability of Enriques Surfaces (from char. p to zero)

answered Apr 12, 2010 at 4:14

8 votes

Holomorphic vector fields acting on Dolbeault cohomology

answered Apr 19, 2010 at 18:20

8 votes

Accepted

Does Ext commute with direct limit?

answered May 27, 2010 at 4:25

8 votes

Accepted

Exact sequence in étale cohomology related with proper birational morphism

answered Aug 23, 2010 at 19:21

8 votes

Can the I-fold direct product be free?

answered Dec 10, 2010 at 10:02

7 votes

Accepted

Cartier dual of \alpha_p

answered Nov 11, 2010 at 17:26

7 votes

Accepted

Determinant and symmetric power

answered Sep 27, 2010 at 4:18

7 votes

Accepted

Semicontinuity and cohomological flatness for algebraic spaces

answered Jul 31, 2010 at 16:59

7 votes

When is an irreducible scheme quasi-compact?

answered Aug 5, 2010 at 19:30

7 votes

Accepted

Does elliptic regularity guarantee analytic solutions?

answered Jul 28, 2010 at 4:40

7 votes

Accepted

When are the homology and cohomology Hopf algebras of topological groups equal?

answered Jun 16, 2010 at 17:16

7 votes

Accepted

Coinciding induced maps

answered May 17, 2010 at 7:57

7 votes

Accepted

sub-tori of a torus, generated by 1-dimensional subgroup

answered May 12, 2010 at 17:27

7 votes

Deformations of sheaves via automorphisms. How to express $Ext^1$?

answered May 29, 2010 at 6:07

7 votes

Accepted

Terminology issue: meaning of 'ample class' ?

answered Apr 22, 2010 at 4:25

7 votes

solutions to equation mod a prime

answered Apr 3, 2010 at 12:52

7 votes

What is the "correct" category of multisets

answered Apr 18, 2010 at 6:15

7 votes

Why do the definition of deck transformations requires homeomorphism

answered Nov 5, 2011 at 6:45

7 votes

Reflexive modules over a 2-dimensional regular local ring

answered Nov 12, 2011 at 7:02

7 votes

Is the composition of two bundle projections necessarily a bundle projection?

answered Sep 7, 2011 at 7:18

6 votes

Invariant differential forms on commutative group schemes are closed!?

answered Sep 11, 2011 at 14:03

6 votes

Accepted

regular singularities and logarithmic singularities

answered Oct 28, 2011 at 8:04

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203 Answers

structure of the variety of normal matrices

every involution of an Enriques surface is

Brauer group of complete DVR

Canonical liftings of endomorphisms of ordinary abelian varieties

On the cohomology of a finite covering map

Presentation of the dual of a locally free sheaf

Characterization of locally free modules via exterior powers

Is there a presentation of the cohomology of the moduli stack of torsion sheaves on an elliptic curve?

Liftability of Enriques Surfaces (from char. p to zero)

Holomorphic vector fields acting on Dolbeault cohomology

Does Ext commute with direct limit?

Exact sequence in étale cohomology related with proper birational morphism

Can the I-fold direct product be free?

Cartier dual of \alpha_p

Determinant and symmetric power

Semicontinuity and cohomological flatness for algebraic spaces

When is an irreducible scheme quasi-compact?

Does elliptic regularity guarantee analytic solutions?

When are the homology and cohomology Hopf algebras of topological groups equal?

Coinciding induced maps

sub-tori of a torus, generated by 1-dimensional subgroup

Deformations of sheaves via automorphisms. How to express $Ext^1$?

Terminology issue: meaning of 'ample class' ?

solutions to equation mod a prime

What is the "correct" category of multisets

Why do the definition of deck transformations requires homeomorphism

Reflexive modules over a 2-dimensional regular local ring

Is the composition of two bundle projections necessarily a bundle projection?

Invariant differential forms on commutative group schemes are closed!?

regular singularities and logarithmic singularities