User fedja

20 votes

1 answer

652 views

Can all partial sums $\sum_{k=1}^n f(ka)$ where $f(x)=\log|2\sin(x/2)|$ be non-negative?

asked Oct 15, 2021 at 0:20

28 votes

2 answers

971 views

Can we always shift two disjoint convex bodies a little bit to decrease the volume of their convex hull?

asked Dec 12, 2018 at 23:48

10 votes

1 answer

532 views

Does every geometric progression contain a small remainder modulo a large prime?

asked Jan 14, 2021 at 17:50

37 votes

2 answers

2k views

Moving one family of commuting self-adjoint operators to another without losing commutativity on the way

asked Jan 6, 2011 at 21:39

11 votes

0 answers

523 views

Is every Baire metric space a complete metric space in disguise?

asked Sep 23, 2020 at 14:38

12 votes

6 answers

1k views

Suggestions for reducing the transmission rate?

asked Mar 23, 2020 at 3:48

163 votes

28 answers

54k views

Cool problems to impress students with group theory [closed]

asked Jan 29, 2010 at 2:08

8 votes

1 answer

248 views

An upper bound for the solution of an integro-differential equation

asked May 20, 2018 at 13:34

24 votes

1 answer

524 views

What is the minimal volume of the intersection of a self-dual cone and the unit ball?

asked Apr 24, 2018 at 17:17

19 votes

0 answers

623 views

Is there a simpler proof of the key lemma in the paper by Hiroshi Iriyeh and Masataka Shibata on the 3D Mahler conjecture?

asked Jun 12, 2017 at 1:05

21 votes

1 answer

719 views

What is the best probabilistic estimate from below for a random polynomial on an arc?

asked Dec 12, 2012 at 1:32

18 votes

1 answer

902 views

Is the ball reducible in some high dimension?

asked Jun 27, 2012 at 17:50

5 votes

0 answers

117 views

Minimal covers instead of tilings in Maxwell Allman's problem

asked Aug 25, 2016 at 0:21

185 votes

8 answers

12k views

Two commuting mappings in the disk

asked Oct 29, 2009 at 20:16

20 votes

2 answers

4k views

Teaching stochastic calculus to students who know no measure theory (or PDE, or...)

asked Nov 28, 2014 at 15:48

10 votes

1 answer

731 views

An exponential polynomial with at least one bounded positivity component

asked Aug 21, 2011 at 16:15

20 votes

2 answers

1k views

Center of mass from the abstract point of view, or could the ancient Greeks invent modern analysis?

asked Dec 21, 2012 at 4:03

16 votes

1 answer

550 views

Convex bodies with constant maximal section function in odd dimensions

asked Jul 15, 2011 at 2:08

14 votes

1 answer

827 views

Why is there no formula for partial sums of some simple series?

asked Dec 3, 2011 at 2:49

10 votes

0 answers

243 views

A slightly generalized existence and uniqueness theorem for integral equations (reference request)

asked Oct 27, 2011 at 23:22

6 votes

1 answer

424 views

A toy model for the t-section problem

asked Jun 1, 2011 at 1:43

20 votes

4 answers

2k views

Minkowski sum of small connected sets

asked Oct 25, 2009 at 15:32

12 votes

3 answers

1k views

Expectation of the product of almost independent Gaussians

asked Oct 26, 2009 at 15:46

Stack Exchange Network

23 Questions

Can all partial sums $\sum_{k=1}^n f(ka)$ where $f(x)=\log|2\sin(x/2)|$ be non-negative?

Can we always shift two disjoint convex bodies a little bit to decrease the volume of their convex hull?

Does every geometric progression contain a small remainder modulo a large prime?

Moving one family of commuting self-adjoint operators to another without losing commutativity on the way

Is every Baire metric space a complete metric space in disguise?

Suggestions for reducing the transmission rate?

Cool problems to impress students with group theory [closed]

An upper bound for the solution of an integro-differential equation

What is the minimal volume of the intersection of a self-dual cone and the unit ball?

Is there a simpler proof of the key lemma in the paper by Hiroshi Iriyeh and Masataka Shibata on the 3D Mahler conjecture?

What is the best probabilistic estimate from below for a random polynomial on an arc?

Is the ball reducible in some high dimension?

Minimal covers instead of tilings in Maxwell Allman's problem

Two commuting mappings in the disk

Teaching stochastic calculus to students who know no measure theory (or PDE, or...)

An exponential polynomial with at least one bounded positivity component

Center of mass from the abstract point of view, or could the ancient Greeks invent modern analysis?

Convex bodies with constant maximal section function in odd dimensions

Why is there no formula for partial sums of some simple series?

A slightly generalized existence and uniqueness theorem for integral equations (reference request)

A toy model for the t-section problem

Minkowski sum of small connected sets

Expectation of the product of almost independent Gaussians