User Rasmus

28 votes

6 answers

6k views

Definition of an algebra over a noncommutative ring

asked Apr 19, 2010 at 21:54

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

11 votes

3 answers

3k views

Is Tor always torsion?

asked Jul 13, 2010 at 15:15

5 votes

2 answers

2k views

Uniform convergence of difference quotient

asked Jul 5, 2010 at 20:14

10 votes

2 answers

2k views

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

asked Jul 7, 2010 at 16:10

5 votes

2 answers

2k views

Homotopy limit-colimit diagrams in stable model categories

asked Jul 1, 2013 at 20:01

8 votes

2 answers

2k views

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

asked Aug 16, 2010 at 16:38

7 votes

1 answer

2k views

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

asked Mar 24, 2010 at 17:26

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

13 votes

1 answer

1k views

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

asked Aug 13, 2010 at 16:49

2 votes

2 answers

1k views

Proving homotopy invariance of cellular homology by constructing a chain homotopy

asked Jul 11, 2010 at 16:35

8 votes

1 answer

1k views

Why is it called spectral triple?

asked Mar 31, 2010 at 9:04

9 votes

3 answers

911 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

866 views

Representation rings of exceptional Lie groups

asked Jul 10, 2013 at 20:32

6 votes

1 answer

859 views

Sources for exact triangles in triangulated categories.

asked Oct 29, 2009 at 21:45

13 votes

1 answer

690 views

Classification of long exact sequences

asked Aug 16, 2012 at 12:05

13 votes

0 answers

610 views

The derived category of integral representations of a Dynkin quiver

asked Apr 25, 2012 at 15:12

4 votes

0 answers

452 views

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

asked Feb 19, 2011 at 4:02

5 votes

2 answers

448 views

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

asked Feb 21, 2011 at 10:59

3 votes

1 answer

418 views

Bousfield localization before and after taking homotopy

asked Jul 12, 2013 at 12:05

4 votes

1 answer

385 views

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

asked Jun 25, 2013 at 7:22

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

1 answer

348 views

Quillen equivalence of diagram categories

asked Jul 12, 2013 at 19:25

4 votes

0 answers

323 views

2-periodic derived equivalence

asked Apr 2, 2015 at 12:36

2 votes

2 answers

296 views

Characterisation of positive elements in l¹(Z)

asked Sep 1, 2010 at 20:19

0 votes

1 answer

215 views

Inductive vs projective limit of sequence of split surjections

asked Dec 11, 2012 at 9:43

3 votes

1 answer

213 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

5 votes

1 answer

183 views

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

asked Jun 29, 2013 at 11:53

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

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

Is Tor always torsion?

Uniform convergence of difference quotient

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

Homotopy limit-colimit diagrams in stable model categories

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

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

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?

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

Proving homotopy invariance of cellular homology by constructing a chain homotopy

Why is it called spectral triple?

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

Representation rings of exceptional Lie groups

Sources for exact triangles in triangulated categories.

Classification of long exact sequences

The derived category of integral representations of a Dynkin quiver

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

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

Bousfield localization before and after taking homotopy

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

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

Quillen equivalence of diagram categories

2-periodic derived equivalence

Characterisation of positive elements in l¹(Z)

Inductive vs projective limit of sequence of split surjections

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

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

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