User Rasmus

30 votes

6 answers

6k views

Definition of an algebra over a noncommutative ring

asked Apr 19, 2010 at 21:54

13 votes

1 answer

1k views

What is the commutative analogue of a C*-subalgebra?

asked Aug 13, 2010 at 16:49

13 votes

0 answers

615 views

The derived category of integral representations of a Dynkin quiver

asked Apr 25, 2012 at 15:12

13 votes

1 answer

694 views

Classification of long exact sequences

asked Aug 16, 2012 at 12:05

11 votes

3 answers

3k views

Is Tor always torsion?

asked Jul 13, 2010 at 15:15

10 votes

2 answers

2k views

Is Hartshorne's definition of the category of varieties natural?

asked Jul 7, 2010 at 16:10

9 votes

2 answers

2k views

What does the representation theory of the reduced C*-algebra correspond to?

asked Aug 16, 2010 at 16:38

9 votes

3 answers

990 views

Is there a list of all connected T_0-spaces with 5 points?

asked Oct 21, 2010 at 16:57

9 votes

3 answers

894 views

Representation rings of exceptional Lie groups

asked Jul 10, 2013 at 20:32

8 votes

1 answer

1k views

Why is it called spectral triple?

asked Mar 31, 2010 at 9:04

7 votes

3 answers

1k views

Triangulations coming from a poset. Or: What conditions are necessary and sufficient for a finite simplicial complex to be the order complex of a poset?

asked Mar 21, 2010 at 16:57

7 votes

1 answer

2k views

Ambiguous definition of "nerve of an open covering" on wikipedia?

asked Mar 24, 2010 at 17:26

6 votes

1 answer

875 views

Sources for exact triangles in triangulated categories.

asked Oct 29, 2009 at 21:45

6 votes

0 answers

367 views

Does every exact six-term sequence arise as the K-theory of a locally compact pair?

asked Feb 22, 2011 at 10:59

5 votes

2 answers

456 views

What is the group of additive operations on topological K-theory?

asked Feb 21, 2011 at 10:59

5 votes

2 answers

3k views

Uniform convergence of difference quotient

asked Jul 5, 2010 at 20:14

5 votes

1 answer

187 views

Is this a description of the $\aleph_1$-localizing subcategory generated by a compact generator?

asked Jun 29, 2013 at 11:53

5 votes

2 answers

2k views

Homotopy limit-colimit diagrams in stable model categories

asked Jul 1, 2013 at 20:01

5 votes

1 answer

351 views

Quillen equivalence of diagram categories

asked Jul 12, 2013 at 19:25

4 votes

1 answer

390 views

Is every soft sheaf of countable $\mathbb Q$-vector spaces a direct sum of skyscraper sheaves?

asked Jun 25, 2013 at 7:22

4 votes

0 answers

334 views

2-periodic derived equivalence

asked Apr 2, 2015 at 12:36

4 votes

0 answers

455 views

What is the spectrum of the commutative C*-algebra I have constructed here?

asked Feb 19, 2011 at 4:02

3 votes

1 answer

217 views

Does Wolbert's derived equivalence between $E_*^R$-local $R$-modules and $R_E$-modules come from a Quillen equivalence?

asked Aug 11, 2013 at 20:52

3 votes

1 answer

433 views

Bousfield localization before and after taking homotopy

asked Jul 12, 2013 at 12:05

2 votes

2 answers

302 views

Characterisation of positive elements in l¹(Z)

asked Sep 1, 2010 at 20:19

2 votes

3 answers

5k views

Justification for the matching condition for the wave function at potential jumps. Why is it both restrictive enough and sufficiently general?

asked Jul 26, 2010 at 12:43

2 votes

2 answers

1k views

Proving homotopy invariance of cellular homology by constructing a chain homotopy

asked Jul 11, 2010 at 16:35

0 votes

1 answer

221 views

Inductive vs projective limit of sequence of split surjections

asked Dec 11, 2012 at 9:43

0 votes

1 answer

127 views

Explicit indecomposable monomorphism of finitely generated non-indecomposable Abelian groups.

asked Feb 12, 2013 at 14:23

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29 Questions

Definition of an algebra over a noncommutative ring

What is the commutative analogue of a C*-subalgebra?

The derived category of integral representations of a Dynkin quiver

Classification of long exact sequences

Is Tor always torsion?

Is Hartshorne's definition of the category of varieties natural?

What does the representation theory of the reduced C*-algebra correspond to?

Is there a list of all connected T_0-spaces with 5 points?

Representation rings of exceptional Lie groups

Why is it called spectral triple?

Triangulations coming from a poset. Or: What conditions are necessary and sufficient for a finite simplicial complex to be the order complex of a poset?

Ambiguous definition of "nerve of an open covering" on wikipedia?

Sources for exact triangles in triangulated categories.

Does every exact six-term sequence arise as the K-theory of a locally compact pair?

What is the group of additive operations on topological K-theory?

Uniform convergence of difference quotient

Is this a description of the $\aleph_1$-localizing subcategory generated by a compact generator?

Homotopy limit-colimit diagrams in stable model categories

Quillen equivalence of diagram categories

Is every soft sheaf of countable $\mathbb Q$-vector spaces a direct sum of skyscraper sheaves?

2-periodic derived equivalence

What is the spectrum of the commutative C*-algebra I have constructed here?

Does Wolbert's derived equivalence between $E_*^R$-local $R$-modules and $R_E$-modules come from a Quillen equivalence?

Bousfield localization before and after taking homotopy

Characterisation of positive elements in l¹(Z)

Justification for the matching condition for the wave function at potential jumps. Why is it both restrictive enough and sufficiently general?

Proving homotopy invariance of cellular homology by constructing a chain homotopy

Inductive vs projective limit of sequence of split surjections

Explicit indecomposable monomorphism of finitely generated non-indecomposable Abelian groups.