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Rasmus
  • Member for 14 years, 5 months
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28 votes
6 answers
6k views

Definition of an algebra over a noncommutative ring

13 votes
1 answer
1k views

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

13 votes
0 answers
610 views

The derived category of integral representations of a Dynkin quiver

13 votes
1 answer
689 views

Classification of long exact sequences

11 votes
3 answers
3k views

Is Tor always torsion?

10 votes
2 answers
2k views

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

9 votes
3 answers
907 views

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

9 votes
3 answers
866 views

Representation rings of exceptional Lie groups

8 votes
2 answers
2k views

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

8 votes
1 answer
1k views

Why is it called *spectral* triple?

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?

7 votes
1 answer
2k views

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

6 votes
1 answer
858 views

Sources for exact triangles in triangulated categories.

6 votes
0 answers
367 views

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

5 votes
2 answers
448 views

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

5 votes
2 answers
2k views

Uniform convergence of difference quotient

5 votes
1 answer
182 views

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

5 votes
2 answers
2k views

Homotopy limit-colimit diagrams in stable model categories

5 votes
1 answer
347 views

Quillen equivalence of diagram categories

4 votes
1 answer
384 views

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

4 votes
0 answers
322 views

2-periodic derived equivalence

4 votes
0 answers
452 views

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

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?

3 votes
1 answer
417 views

Bousfield localization before and after taking homotopy

2 votes
2 answers
295 views

Characterisation of positive elements in l¹(Z)

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?

2 votes
2 answers
1k views

Proving homotopy invariance of cellular homology by constructing a chain homotopy

0 votes
1 answer
215 views

Inductive vs projective limit of sequence of split surjections

0 votes
1 answer
127 views

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