User Torsten Ekedahl

5 votes

How big can the irreps of a finite group be (over an arbitrary field)?

answered Mar 12, 2010 at 6:06

5 votes

Accepted

intersection pairing on intersection cohomology

answered Mar 19, 2011 at 17:40

5 votes

action of SO(q)

answered May 31, 2011 at 6:18

5 votes

Accepted

composition of covering map and bundle projection

answered Aug 24, 2011 at 6:32

5 votes

Accepted

The number of orbits of a permutation action

answered Jul 20, 2011 at 14:38

5 votes

Accepted

Chern numbers of primitive classes in BU

answered Nov 2, 2011 at 23:01

5 votes

Accepted

Brauer group of a field of power series in two variables.

answered Oct 18, 2011 at 19:28

4 votes

Accepted

Coderivations of $S(V)$ correspond to linear maps $S(V) \to V.$ Only over characteristic $0$?

answered Aug 5, 2011 at 12:59

4 votes

Accepted

Restricted universal enveloping algebra of Abelian p-Lie algebra

answered Jun 5, 2011 at 4:42

4 votes

A split short exact sequence of algebraic fundamental groups

answered May 3, 2010 at 21:51

4 votes

Topological Content of the Kakutani Fixed Point Theorem

answered Apr 25, 2010 at 7:37

4 votes

Connection: locally free - locally projective

answered May 22, 2010 at 11:59

4 votes

Positive solutions of linear Diophantine equations

answered May 9, 2010 at 15:27

4 votes

Accepted

The Poincare Bundle(s) on C \times J

answered May 11, 2010 at 5:22

4 votes

Is it possible to classify all Weil cohomologies?

answered Jun 4, 2010 at 5:59

4 votes

Finite subgroups of ${\rm SL}_2(\mathbb{Z})$ (reference request)

answered Jun 6, 2010 at 19:17

4 votes

Accepted

Birational correspondences and codimension where not an isomorphism

answered May 28, 2010 at 4:49

4 votes

If two "homogeneous" algebraic varieties are isomorphic, are they necessarily related by a linear map?

answered Oct 4, 2010 at 18:16

4 votes

Finite categories and partial orders

answered Jul 27, 2010 at 20:39

4 votes

Conjugacy class of a full Jordan block over integers

answered Jan 22, 2011 at 6:29

4 votes

Accepted

Principal bundles over groups

answered Feb 14, 2011 at 15:40

4 votes

Is there a higher homotopical spinor theory?

answered Nov 29, 2010 at 18:32

3 votes

direct image functor

answered Dec 9, 2010 at 17:06

3 votes

Accepted

$M \oplus N$ is of finite type if $M,N$ are of finite type?

answered Nov 15, 2010 at 20:15

3 votes

Invertible elements in monoid rings of unital monoids without non-trivial invertible elements

answered Oct 23, 2010 at 11:52

3 votes

Accepted

The irreducibility of an algebraic variety

answered Jan 28, 2011 at 11:46

3 votes

Accepted

Cohomology analogue for central series of length more than two

answered Aug 15, 2010 at 22:06

3 votes

Accepted

Q-lattices and commensurability, any insight into the definition and intuition?

answered Aug 10, 2010 at 18:17

3 votes

Accepted

Morphisms of a simple sheaf over an algebra to its double dual

answered Sep 22, 2010 at 15:29

3 votes

homology of abelian variety ?

answered May 12, 2010 at 16:46

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203 Answers

How big can the irreps of a finite group be (over an arbitrary field)?

intersection pairing on intersection cohomology

action of SO(q)

composition of covering map and bundle projection

The number of orbits of a permutation action

Chern numbers of primitive classes in BU

Brauer group of a field of power series in two variables.

Coderivations of $S(V)$ correspond to linear maps $S(V) \to V.$ Only over characteristic $0$?

Restricted universal enveloping algebra of Abelian p-Lie algebra

A split short exact sequence of algebraic fundamental groups

Topological Content of the Kakutani Fixed Point Theorem

Connection: locally free - locally projective

Positive solutions of linear Diophantine equations

The Poincare Bundle(s) on C \times J

Is it possible to classify all Weil cohomologies?

Finite subgroups of ${\rm SL}_2(\mathbb{Z})$ (reference request)

Birational correspondences and codimension where not an isomorphism

If two "homogeneous" algebraic varieties are isomorphic, are they necessarily related by a linear map?

Finite categories and partial orders

Conjugacy class of a full Jordan block over integers

Principal bundles over groups

Is there a higher homotopical spinor theory?

direct image functor

$M \oplus N$ is of finite type if $M,N$ are of finite type?

Invertible elements in monoid rings of unital monoids without non-trivial invertible elements

The irreducibility of an algebraic variety

Cohomology analogue for central series of length more than two

Q-lattices and commensurability, any insight into the definition and intuition?

Morphisms of a simple sheaf over an algebra to its double dual

homology of abelian variety ?