User Wolfgang

50 votes

37 answers

6k views

Structures that turn out to exhibit a symmetry even though their definition doesn't

asked Dec 13, 2013 at 19:56

48 votes

6 answers

5k views

Are there examples of conjectures supported by heuristic arguments that have been finally disproved?

asked Aug 16, 2018 at 16:53

34 votes

2 answers

1k views

Representations of $\zeta(3)$ as continued fractions involving cubic polynomials

asked Feb 11, 2019 at 15:38

33 votes

1 answer

7k views

tiling a rectangle with the smallest number of squares

asked Dec 14, 2012 at 15:30

29 votes

2 answers

2k views

Is there a closed form for $\int_0^\infty\frac{\tanh^3(x)}{x^2}dx$?

asked Jun 6, 2017 at 16:29

29 votes

2 answers

3k views

A new way of approaching the pole of the Riemann zeta function - and a new conjectured formula

asked Dec 1, 2019 at 17:46

28 votes

2 answers

1k views

Are there irreducible polynomials with all zeros on two concentric circles?

asked Oct 4, 2015 at 12:51

26 votes

2 answers

1k views

Are these two new ways of representing odd zeta values as integrals known?

asked May 29, 2017 at 18:40

24 votes

1 answer

2k views

Why these surprising proportionalities of integrals involving odd zeta values?

asked Apr 22, 2019 at 15:42

22 votes

4 answers

5k views

Eigenvalues of permutations of a real matrix: can they all be real?

asked May 23, 2013 at 20:58

18 votes

1 answer

851 views

"Squeezing" a finite group between symmetric groups

asked Oct 28, 2015 at 14:14

17 votes

1 answer

2k views

Hlawka inequality for determinants of positive definite matrices

asked Sep 30, 2014 at 19:10

17 votes

0 answers

417 views

Do the coefficients of these irreducible polynomials always become periodic?

asked Nov 21, 2013 at 19:53

16 votes

5 answers

706 views

The smallest disk containing all sides of an $n$-gon

asked Nov 3, 2015 at 14:25

16 votes

0 answers

518 views

Aligned roots of irreducible polynomials

asked Sep 26, 2015 at 8:56

15 votes

2 answers

1k views

Why are some q-analogues more canonical than others?

asked Mar 1, 2012 at 23:25

15 votes

2 answers

1k views

Definitions of determinant by unique features

asked Jun 28, 2022 at 9:57

15 votes

2 answers

1k views

Bounding the matrix norm of a commutator $[A,B]$ in terms of the norms of $A$ and $B$

asked Dec 27, 2016 at 10:06

15 votes

2 answers

650 views

A tantalizing Gamma quotient to challenge the Rohrlich-Lang Conjecture

asked Dec 17, 2018 at 21:17

14 votes

2 answers

570 views

A simple but curious determinantal inequality

asked Jun 23, 2017 at 10:16

14 votes

6 answers

1k views

Euler's divergent series sum n!*(-1)^n: what is known about the resulting constant?

asked Jan 14, 2012 at 18:13

14 votes

2 answers

2k views

sequences with a fractal dimension

asked Dec 22, 2012 at 14:17

14 votes

1 answer

784 views

Are there integral representations of the Mertens constant?

asked Mar 10, 2015 at 14:10

13 votes

1 answer

431 views

$\pm1$-polynomials with a maximal non-real root

asked Nov 9, 2014 at 19:12

13 votes

3 answers

796 views

Is there a closed form of $\int_0^\frac12\dfrac{\text{arcsinh}^nx}{x^m}dx$?

asked Feb 15, 2016 at 21:11

13 votes

2 answers

722 views

How to prove that $\int _0^\infty\frac{\text{arcsinh}^nx}{x^m}dx$ is a rational combination of zeta values?

asked Feb 23, 2016 at 20:11

13 votes

2 answers

3k views

How many vertices/edges/faces at most for a convex polyhedron that tiles space?

asked Jan 18, 2012 at 22:38

13 votes

2 answers

1k views

Is there any expression for the Feigenbaum constants ?

asked Feb 6, 2012 at 19:06

13 votes

1 answer

377 views

Some more binomial coefficient determinants

asked Apr 14, 2018 at 20:03

12 votes

0 answers

816 views

Eigenvalues of permutations of a real matrix: how complex can they be?

asked May 23, 2013 at 21:03

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137 Questions

Structures that turn out to exhibit a symmetry even though their definition doesn't

Are there examples of conjectures supported by heuristic arguments that have been finally disproved?

Representations of $\zeta(3)$ as continued fractions involving cubic polynomials

tiling a rectangle with the smallest number of squares

Is there a closed form for $\int_0^\infty\frac{\tanh^3(x)}{x^2}dx$?

A new way of approaching the pole of the Riemann zeta function - and a new conjectured formula

Are there irreducible polynomials with all zeros on two concentric circles?

Are these two new ways of representing odd zeta values as integrals known?

Why these surprising proportionalities of integrals involving odd zeta values?

Eigenvalues of permutations of a real matrix: can they all be real?

"Squeezing" a finite group between symmetric groups

Hlawka inequality for determinants of positive definite matrices

Do the coefficients of these irreducible polynomials always become periodic?

The smallest disk containing all sides of an $n$-gon

Aligned roots of irreducible polynomials

Why are some q-analogues more canonical than others?

Definitions of determinant by unique features

Bounding the matrix norm of a commutator $[A,B]$ in terms of the norms of $A$ and $B$

A tantalizing Gamma quotient to challenge the Rohrlich-Lang Conjecture

A simple but curious determinantal inequality

Euler's divergent series sum n!*(-1)^n: what is known about the resulting constant?

sequences with a fractal dimension

Are there integral representations of the Mertens constant?

$\pm1$-polynomials with a maximal non-real root

Is there a closed form of $\int_0^\frac12\dfrac{\text{arcsinh}^nx}{x^m}dx$?

How to prove that $\int _0^\infty\frac{\text{arcsinh}^nx}{x^m}dx$ is a rational combination of zeta values?

How many vertices/edges/faces at most for a convex polyhedron that tiles space?

Is there any expression for the Feigenbaum constants ?

Some more binomial coefficient determinants

Eigenvalues of permutations of a real matrix: how complex can they be?