User David Treumann

28 votes

3 answers

4k views

How do I compare the different notions of Fourier transform for sheaves?

asked Oct 28, 2009 at 20:49

28 votes

2 answers

1k views

Is there a geometric realization of $\mathbf{C}((t))$-varieties?

asked Dec 25, 2016 at 2:01

22 votes

2 answers

3k views

What is the relationship between integrable systems and toric degenerations?

asked Oct 23, 2009 at 22:31

20 votes

0 answers

789 views

Is the determinant of cohomology a TQFT?

asked Jun 9, 2016 at 17:31

18 votes

2 answers

953 views

Is there anything significant about GAP's SmallGroup(512,2045)?

asked May 18, 2017 at 21:04

18 votes

1 answer

567 views

Is there a cotangent bundle of a stable $\infty$-category?

asked Nov 20, 2014 at 20:52

17 votes

2 answers

1k views

What are some triangulations of Grassmannians?

asked Mar 12, 2013 at 19:02

17 votes

0 answers

737 views

Is there an approach to Gabber's theorem from the singular support of coherent sheaves?

asked Jan 28, 2016 at 22:33

13 votes

4 answers

4k views

What are CR manifolds like?

asked Dec 1, 2009 at 16:23

13 votes

2 answers

1k views

When does a quasicoherent sheaf vanish?

asked Jan 26, 2010 at 0:27

13 votes

4 answers

1k views

How often does suspension define an action of Z/2 on a category of module spectra?

asked Nov 17, 2010 at 19:24

13 votes

0 answers

371 views

What is the cup-product structure like on a hyperbolic 5-manifold?

asked Oct 12, 2016 at 4:30

11 votes

2 answers

659 views

How many chromatic polynomials of planar maps are there?

asked Jun 8, 2016 at 16:35

11 votes

1 answer

1k views

What functor does a Schubert variety represent?

asked Nov 25, 2009 at 3:02

10 votes

0 answers

686 views

Is endoscopy interesting in simply-laced cases?

asked Jul 1, 2011 at 20:10

10 votes

2 answers

624 views

When does a cubic surface pass through five lines?

asked Nov 6, 2014 at 20:45

8 votes

2 answers

522 views

What's in the genus of the cubic lattice?

asked Feb 3, 2016 at 16:01

7 votes

1 answer

310 views

On the ordered set of real numbers, does sheaf+cosheaf imply constant?

asked Mar 14, 2016 at 14:25

7 votes

2 answers

1k views

What are the possible images of a square under an area-preserving map?

asked Nov 12, 2009 at 3:51

7 votes

0 answers

546 views

Topological obstructions to extending algebraic vector bundles

asked Aug 20, 2010 at 14:56

6 votes

2 answers

851 views

What kind of line bundles have Chern class of Hodge type (2,0) or (0,2)?

asked Jun 8, 2010 at 19:05

3 votes

0 answers

146 views

Does a polytope have a self-indexing shelling?

asked Mar 17, 2015 at 18:45

2 votes

2 answers

654 views

What is the spinor genus of the Leech lattice?

asked Oct 13, 2016 at 16:00

2 votes

1 answer

265 views

Is mean width a Dehn invariant?

asked Jan 23, 2015 at 4:49

2 votes

1 answer

168 views

What if the low-degree cohomology of a $G$-module and all its restrictions vanish?

asked Mar 15, 2015 at 20:17

1 vote

0 answers

131 views

What are some standard operations on the set of localizations of a triangulated category?

asked Mar 17, 2016 at 5:24

1 vote

0 answers

98 views

What is combinatorially possible, for a singular minimal surface in $\mathbf{R}^3$?

asked Jul 23, 2016 at 14:55

1 vote

0 answers

221 views

What is deforming this non-complete intersection like?

asked Jun 28, 2015 at 1:50

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28 Questions

How do I compare the different notions of Fourier transform for sheaves?

Is there a geometric realization of $\mathbf{C}((t))$-varieties?

What is the relationship between integrable systems and toric degenerations?

Is the determinant of cohomology a TQFT?

Is there anything significant about GAP's SmallGroup(512,2045)?

Is there a cotangent bundle of a stable $\infty$-category?

What are some triangulations of Grassmannians?

Is there an approach to Gabber's theorem from the singular support of coherent sheaves?

What are CR manifolds like?

When does a quasicoherent sheaf vanish?

How often does suspension define an action of Z/2 on a category of module spectra?

What is the cup-product structure like on a hyperbolic 5-manifold?

How many chromatic polynomials of planar maps are there?

What functor does a Schubert variety represent?

Is endoscopy interesting in simply-laced cases?

When does a cubic surface pass through five lines?

What's in the genus of the cubic lattice?

On the ordered set of real numbers, does sheaf+cosheaf imply constant?

What are the possible images of a square under an area-preserving map?

Topological obstructions to extending algebraic vector bundles

What kind of line bundles have Chern class of Hodge type (2,0) or (0,2)?

Does a polytope have a self-indexing shelling?

What is the spinor genus of the Leech lattice?

Is mean width a Dehn invariant?

What if the low-degree cohomology of a $G$-module and all its restrictions vanish?

What are some standard operations on the set of localizations of a triangulated category?

What is combinatorially possible, for a singular minimal surface in $\mathbf{R}^3$?

What is deforming this non-complete intersection like?