User Vidit Nanda

78 votes

1 answer

5k views

The topology of Arithmetic Progressions of primes

asked Aug 5, 2012 at 22:42

57 votes

2 answers

17k views

How fast can we really multiply matrices?

asked Jul 6, 2012 at 20:41

55 votes

10 answers

6k views

How often do people read the work that they cite?

asked Jun 4, 2012 at 22:23

47 votes

6 answers

5k views

Can we actually find any fixed points with Brouwer's theorem?

asked Aug 29, 2012 at 21:39

33 votes

4 answers

5k views

Is there a categorical treatment of dynamical systems?

asked Aug 3, 2012 at 3:29

27 votes

1 answer

1k views

Is there a general theory of fiber theorems?

asked Mar 19, 2013 at 2:53

25 votes

5 answers

3k views

Testing simplicial complexes for shellability

asked Feb 10, 2013 at 2:27

24 votes

4 answers

2k views

How many simplicial complexes on n vertices up to homotopy equivalence?

asked Jul 18, 2012 at 21:47

22 votes

3 answers

6k views

Why are ring actions much harder to find than group actions?

asked Jun 25, 2012 at 4:54

22 votes

0 answers

3k views

Origins of the Nerve Theorem

asked Jun 4, 2012 at 23:14

22 votes

12 answers

2k views

Instances where an existence result precedes the constructive version

asked Aug 15, 2012 at 0:17

22 votes

0 answers

663 views

Are there "chain complexes" and "homology groups" taking values in pairs of topological spaces?

asked Jun 22, 2013 at 0:21

21 votes

2 answers

1k views

How does it End?

asked Jul 9, 2013 at 15:05

21 votes

3 answers

1k views

Are functor categories with triangulated codomains themselves triangulated?

asked Dec 16, 2020 at 22:30

17 votes

1 answer

1k views

Raoul Bott's quote on Morse Theory cited by Bestvina and Kahle: where is it from?

asked Jun 22, 2012 at 1:01

16 votes

1 answer

358 views

Moduli space of boundary maps with prescribed chain and homology groups?

asked Sep 16, 2015 at 15:57

15 votes

3 answers

2k views

Combinatorial analogues of curvature

asked Jun 13, 2012 at 20:55

15 votes

5 answers

915 views

What fraction of n x n invertible integer matrices contain at least one unit?

asked Sep 14, 2012 at 20:31

15 votes

2 answers

873 views

Measuring big stuff

asked Nov 22, 2012 at 4:22

14 votes

2 answers

1k views

Symmetric group action on squarefree polynomials

asked Jul 27, 2012 at 15:01

14 votes

5 answers

575 views

When does a pair of homotopic Lipschitz functions fail to admit a Lipschitz homotopy?

asked Jun 30, 2013 at 15:20

13 votes

3 answers

819 views

What fraction of n-point sets in the unit ball have diameter smaller than 1?

asked Jun 14, 2013 at 14:03

13 votes

1 answer

468 views

When does localization preserve homotopy type of classifying spaces?

asked Jul 5, 2013 at 20:23

12 votes

4 answers

1k views

For which metric spaces is Gromov-Hausdorff distance actually achieved?

asked Jun 28, 2013 at 22:53

11 votes

0 answers

200 views

Fundamental groups of reduced subgroup lattices

asked Jul 29, 2013 at 21:02

11 votes

1 answer

632 views

What are the homological properties of Young's lattice?

asked Aug 12, 2013 at 16:07

11 votes

4 answers

4k views

When is the infimum of an arbitrary family of measurable functions also measurable?

asked Jul 14, 2012 at 22:58

10 votes

1 answer

979 views

Can we invert barycentric subdivision?

asked May 31, 2013 at 12:31

10 votes

1 answer

360 views

Computing K-theory for cellular vector bundles

asked Dec 8, 2019 at 16:08

10 votes

1 answer

280 views

Localizing 2-categories about a single morphism

asked Jun 5, 2014 at 18:22

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79 Questions

The topology of Arithmetic Progressions of primes

How fast can we really multiply matrices?

How often do people read the work that they cite?

Can we actually find any fixed points with Brouwer's theorem?

Is there a categorical treatment of dynamical systems?

Is there a general theory of fiber theorems?

Testing simplicial complexes for shellability

How many simplicial complexes on n vertices up to homotopy equivalence?

Why are ring actions much harder to find than group actions?

Origins of the Nerve Theorem

Instances where an existence result precedes the constructive version

Are there "chain complexes" and "homology groups" taking values in pairs of topological spaces?

How does it End?

Are functor categories with triangulated codomains themselves triangulated?

Raoul Bott's quote on Morse Theory cited by Bestvina and Kahle: where is it from?

Moduli space of boundary maps with prescribed chain and homology groups?

Combinatorial analogues of curvature

What fraction of n x n invertible integer matrices contain at least one unit?

Measuring big stuff

Symmetric group action on squarefree polynomials

When does a pair of homotopic Lipschitz functions fail to admit a Lipschitz homotopy?

What fraction of n-point sets in the unit ball have diameter smaller than 1?

When does localization preserve homotopy type of classifying spaces?

For which metric spaces is Gromov-Hausdorff distance actually achieved?

Fundamental groups of reduced subgroup lattices

What are the homological properties of Young's lattice?

When is the infimum of an arbitrary family of measurable functions also measurable?

Can we invert barycentric subdivision?

Computing K-theory for cellular vector bundles

Localizing 2-categories about a single morphism