User S. Carnahan

104 votes

10 answers

24k views

Motivation for algebraic K-theory?

asked Oct 12, 2009 at 17:59

66 votes

4 answers

11k views

Is there a good way to think of vanishing cycles and nearby cycles?

asked Oct 21, 2009 at 5:26

37 votes

3 answers

5k views

Is there a nice proof of the fact that there are (p-1)/24 supersingular elliptic curves in characteristic p?

asked May 14, 2010 at 4:46

26 votes

4 answers

1k views

Are there lightweight foundations for arbitrarily extendable objects?

asked Apr 6, 2012 at 10:49

18 votes

1 answer

854 views

Can we reconstruct positive weight invariants in algebraic topology using algebraic geometry?

asked Mar 14, 2010 at 10:04

16 votes

2 answers

1k views

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

asked Dec 12, 2009 at 8:37

15 votes

6 answers

2k views

How do I describe a fusion category given a subfactor?

asked Oct 23, 2009 at 6:46

12 votes

0 answers

454 views

Where is the representability of the moduli of curves with framed points proved?

asked Jan 10, 2012 at 14:26

11 votes

1 answer

364 views

Can we glue characteristic 0 and characteristic p representations of a finite group given equality of (Brauer) characters?

asked Mar 18, 2018 at 6:27

11 votes

1 answer

780 views

Is there a canonical map from the cohomology of orbifold chiral de Rham on an orbifold to the cohomology of chiral de Rham on a crepant resolution?

asked May 30, 2011 at 14:48

10 votes

3 answers

2k views

How do I describe the GL_n torsor attached to a smooth morphism of relative dimension n?

asked Jun 8, 2010 at 22:12

9 votes

2 answers

356 views

Is there a subfactor construction involving 2-groups?

asked Nov 17, 2009 at 6:58

8 votes

1 answer

578 views

Transmutation versus operads

asked Jan 31, 2010 at 18:59

8 votes

2 answers

819 views

Are there interesting monoidal structures on representations of quantum affine algebras?

asked Oct 11, 2009 at 21:27

8 votes

4 answers

979 views

Does there exist a family of curves (or abelian varieties) on the punctured line with specified monodromy on H^1?

asked Feb 28, 2011 at 8:24

8 votes

1 answer

499 views

Are associated bundles representable in schemes?

asked Aug 5, 2011 at 6:15

5 votes

2 answers

630 views

Where can I find an explicit description of the pseudocolimit of a small pseudofunctor to Cat?

asked Sep 7, 2011 at 11:51

5 votes

0 answers

97 views

Is there a composite-order generalization of the homomorphism on Rep(Z/p) giving total dimension of Tate cohomology?

asked Jan 20, 2018 at 15:02

2 votes

1 answer

175 views

Do rational points in a split reductive group act transitively on the orbits of the Cartan subalgebra (w.r.t. automorphism group of Lie algebra)?

asked Mar 10, 2020 at 18:10

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19 Questions

Motivation for algebraic K-theory?

Is there a good way to think of vanishing cycles and nearby cycles?

Is there a nice proof of the fact that there are (p-1)/24 supersingular elliptic curves in characteristic p?

Are there lightweight foundations for arbitrarily extendable objects?

Can we reconstruct positive weight invariants in algebraic topology using algebraic geometry?

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

How do I describe a fusion category given a subfactor?

Where is the representability of the moduli of curves with framed points proved?

Can we glue characteristic 0 and characteristic p representations of a finite group given equality of (Brauer) characters?

Is there a canonical map from the cohomology of orbifold chiral de Rham on an orbifold to the cohomology of chiral de Rham on a crepant resolution?

How do I describe the GL_n torsor attached to a smooth morphism of relative dimension n?

Is there a subfactor construction involving 2-groups?

Transmutation versus operads

Are there interesting monoidal structures on representations of quantum affine algebras?

Does there exist a family of curves (or abelian varieties) on the punctured line with specified monodromy on H^1?

Are associated bundles representable in schemes?

Where can I find an explicit description of the pseudocolimit of a small pseudofunctor to Cat?

Is there a composite-order generalization of the homomorphism on Rep(Z/p) giving total dimension of Tate cohomology?

Do rational points in a split reductive group act transitively on the orbits of the Cartan subalgebra (w.r.t. automorphism group of Lie algebra)?