User Torsten Ekedahl

6 votes

Have people successfully worked with the full ring of differential operators in characteristic p?

answered Jul 21, 2011 at 4:51

6 votes

Accepted

How does one view the De Rham spectral sequence as a Grothendieck spectral sequence?

answered Jun 27, 2011 at 5:42

6 votes

On the field of invariants of a finite group

answered Jun 29, 2011 at 4:18

6 votes

Accepted

Connected extensions of finite by connected algebraic groups

answered Aug 26, 2011 at 13:10

6 votes

Accepted

On special 2-groups

answered Mar 14, 2011 at 14:48

6 votes

Accepted

If Spec(A) has a G-fixed point and a dense G-orbit, is Spec(A) a cone?

answered Mar 31, 2011 at 7:49

6 votes

Homological dimension of a graded ring which is like polynomial ring

answered Apr 10, 2010 at 5:46

6 votes

Quotient of a reductive group by a non-smooth central finite subgroup

answered Feb 24, 2010 at 15:58

6 votes

Is there a projection formula for motivic étale cohomology?

answered Apr 23, 2010 at 10:24

6 votes

Accepted

derivative in the ring k[e]/e², chain rule

answered Apr 30, 2010 at 8:08

6 votes

Accepted

What is the universal enveloping algebra?

answered May 17, 2010 at 19:06

6 votes

Is the tangent space functor from PD formal groups to Lie algebras an equivalence?

answered Jun 21, 2010 at 19:16

6 votes

Accepted

When is the Yoneda product graded commutative?

answered Jul 28, 2010 at 8:52

6 votes

Accepted

Relationship between topological cohomology and $\ell$-adic cohomology

answered Jul 31, 2010 at 6:10

6 votes

Up to projectivities, which configurations of four lines in $\mathbb{P}^3$ can one distinguish?

answered Aug 13, 2010 at 13:39

6 votes

Compactifications of varieties with small complement

answered Oct 10, 2010 at 18:08

6 votes

Relation between l-adic and l'-adic geometric monodromy

answered Sep 3, 2010 at 4:32

6 votes

Accepted

Does trivial on local cohomology implies trivial on global cohomology?

answered Nov 26, 2010 at 21:46

6 votes

Accepted

Geometric motivation for the Stanley-Reisner correspondence

answered Dec 9, 2010 at 10:04

6 votes

Sheaves without global sections

answered Oct 26, 2010 at 4:39

6 votes

Accepted

How to show that a form of Euler characteristic is constant for a family of schemes?

answered Feb 8, 2011 at 14:58

5 votes

If one wants to work with $Q_l$-adic sheaves, should the scheme be of finite type over a 1-dimensional one?

answered Feb 4, 2011 at 17:20

5 votes

Accepted

Explicit injective resolutions of (Laurent) polynomial rings

answered Nov 30, 2010 at 19:00

5 votes

Comparing lower central series and augmentation ideal completions

answered Sep 11, 2010 at 6:01

5 votes

Vector fields on complete intersections

answered Oct 11, 2010 at 19:44

5 votes

An explicit description of Lawvere's segment in the category of simplicial sets

answered Jun 17, 2010 at 14:29

5 votes

Hodge numbers of compactifications

answered Jun 18, 2010 at 4:43

5 votes

Accepted

Betti Cohomology of singular Kummer Surface

answered Jun 19, 2010 at 5:36

5 votes

Tensor products of Weyl modules in positive characteristic

answered Jun 15, 2010 at 18:28

5 votes

Resolution of a free lie algebra as a module over its universal enveloping algebra.

answered Mar 1, 2010 at 13:49

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203 Answers

Have people successfully worked with the full ring of differential operators in characteristic p?

How does one view the De Rham spectral sequence as a Grothendieck spectral sequence?

On the field of invariants of a finite group

Connected extensions of finite by connected algebraic groups

On special 2-groups

If Spec(A) has a G-fixed point and a dense G-orbit, is Spec(A) a cone?

Homological dimension of a graded ring which is like polynomial ring

Quotient of a reductive group by a non-smooth central finite subgroup

Is there a projection formula for motivic étale cohomology?

derivative in the ring k[e]/e², chain rule

What is the universal enveloping algebra?

Is the tangent space functor from PD formal groups to Lie algebras an equivalence?

When is the Yoneda product graded commutative?

Relationship between topological cohomology and $\ell$-adic cohomology

Up to projectivities, which configurations of four lines in $\mathbb{P}^3$ can one distinguish?

Compactifications of varieties with small complement

Relation between l-adic and l'-adic geometric monodromy

Does trivial on local cohomology implies trivial on global cohomology?

Geometric motivation for the Stanley-Reisner correspondence

Sheaves without global sections

How to show that a form of Euler characteristic is constant for a family of schemes?

If one wants to work with $Q_l$-adic sheaves, should the scheme be of finite type over a 1-dimensional one?

Explicit injective resolutions of (Laurent) polynomial rings

Comparing lower central series and augmentation ideal completions

Vector fields on complete intersections

An explicit description of Lawvere's segment in the category of simplicial sets

Hodge numbers of compactifications

Betti Cohomology of singular Kummer Surface

Tensor products of Weyl modules in positive characteristic

Resolution of a free lie algebra as a module over its universal enveloping algebra.