User zeb

52 votes

Magic trick based on deep mathematics

answered Feb 9, 2010 at 1:22

44 votes

Strange result about convexity

answered Oct 30, 2021 at 20:31

28 votes

Accepted

"Circular" domination in ${\mathbb R}^4$

answered Dec 6, 2013 at 8:47

20 votes

How to show this symmetric function inequality

answered Feb 6, 2021 at 17:37

18 votes

Accepted

Polynomial roots and convexity

answered Mar 18, 2011 at 16:25

18 votes

What is the cover time of a random walk on a cube?

answered Mar 23, 2011 at 1:38

18 votes

Accepted

One tetrahedron inside another tetrahedron

answered Dec 17, 2011 at 13:45

16 votes

Accepted

Generalization of Tamarkin's ARO 1993, final round, problem 10/8: still a conjecture?

answered Jun 16, 2011 at 20:40

15 votes

A plausible inequality

answered Apr 3, 2010 at 8:06

15 votes

Accepted

Placing numbers $1,2,\ldots,n^3$ in a cube so that numbers of any two adjacent unit subcube are coprime

answered Apr 12, 2014 at 2:41

14 votes

Accepted

The sequence $a_{n+1}=\left\lceil \frac{-1+\sqrt{5}}{2}a_{n}-a_{n-1} \right\rceil$ is periodic

answered Feb 6, 2016 at 6:46

12 votes

The theory of a model of a theory that knows all formulas true in almost all its models

answered Mar 23, 2020 at 2:58

11 votes

Is it possible to capture a sphere in a knot?

answered Dec 8, 2009 at 1:17

10 votes

Accepted

Multilinear generalization of Cauchy-Schwarz inequality

answered Aug 29, 2011 at 1:41

10 votes

Accepted

Distribution of degree in graphs: when is the friendship paradox the paradox it wants to be?

answered Apr 26, 2020 at 19:27

10 votes

Accepted

Elementary proof of a triangular grid lemma

answered Jun 3, 2015 at 9:55

9 votes

Accepted

A divergent series related to the number of divisors of of p-1

answered Apr 25, 2013 at 5:32

9 votes

Accepted

Sheaf cohomology in non-commutative setup

answered May 28, 2013 at 16:09

9 votes

Lifting units from modulus n to modulus mn.

answered Jul 22, 2010 at 1:25

8 votes

Will a ball fired through a focus of an ellipse eventually tend to a horizontal line?

answered Mar 21, 2011 at 18:21

8 votes

Accepted

An inequality involving sums of powers

answered Sep 19, 2012 at 16:45

8 votes

Accepted

Binary words that are nonconstant on long arithmetic progressions

answered Oct 30, 2020 at 0:47

7 votes

Accepted

Free median algebras and maximal linked systems

answered Oct 22, 2022 at 15:49

7 votes

Polynomial threading through a monotone corridor

answered Jan 2, 2015 at 23:49

7 votes

What defines a "short proof"?

answered Apr 28, 2015 at 3:21

7 votes

Does every ellipse inside a tetrahedron inside a ball fit in a triangle inside the ball?

answered Oct 8, 2012 at 3:46

7 votes

Magic trick based on deep mathematics

answered Dec 26, 2009 at 3:19

7 votes

Is (n,m)=(18,7) the only positive solution to n^2 + n + 1 = m^3 ?

answered Feb 23, 2011 at 0:36

6 votes

Tensor product is to flat as Hom is to ?

answered Jan 7, 2010 at 7:27

6 votes

Reals with integer powers bounded away from integers?

answered Apr 10, 2013 at 2:14

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72 Answers

Magic trick based on deep mathematics

Strange result about convexity

"Circular" domination in ${\mathbb R}^4$

How to show this symmetric function inequality

Polynomial roots and convexity

What is the cover time of a random walk on a cube?

One tetrahedron inside another tetrahedron

Generalization of Tamarkin's ARO 1993, final round, problem 10/8: still a conjecture?

A plausible inequality

Placing numbers $1,2,\ldots,n^3$ in a cube so that numbers of any two adjacent unit subcube are coprime

The sequence $a_{n+1}=\left\lceil \frac{-1+\sqrt{5}}{2}a_{n}-a_{n-1} \right\rceil$ is periodic

The theory of a model of a theory that knows all formulas true in almost all its models

Is it possible to capture a sphere in a knot?

Multilinear generalization of Cauchy-Schwarz inequality

Distribution of degree in graphs: when is the friendship paradox the paradox it wants to be?

Elementary proof of a triangular grid lemma

A divergent series related to the number of divisors of of p-1

Sheaf cohomology in non-commutative setup

Lifting units from modulus n to modulus mn.

Will a ball fired through a focus of an ellipse eventually tend to a horizontal line?

An inequality involving sums of powers

Binary words that are nonconstant on long arithmetic progressions

Free median algebras and maximal linked systems

Polynomial threading through a monotone corridor

What defines a "short proof"?

Does every ellipse inside a tetrahedron inside a ball fit in a triangle inside the ball?

Magic trick based on deep mathematics

Is (n,m)=(18,7) the only positive solution to n^2 + n + 1 = m^3 ?

Tensor product is to flat as Hom is to ?

Reals with integer powers bounded away from integers?