User Greg Egan

32 votes

0 answers

1k views

Cubic function $\mathbb{Z}^2 \to \mathbb{Z}$ cannot be injective

asked May 9, 2021 at 0:10

30 votes

2 answers

2k views

When does doubling the size of a set multiply the number of subsets by an integer?

asked Jul 8, 2018 at 4:16

16 votes

1 answer

533 views

Is there a degenerate simplex in $\mathbb{R}^{8 k-1}$ with odd integer edge lengths?

asked Aug 28, 2021 at 5:17

10 votes

1 answer

938 views

Why does this antisymmetric product factor out a determinant?

asked Jul 28, 2014 at 11:40

10 votes

1 answer

836 views

Factor a sum of products of cofactors

asked Aug 1, 2014 at 8:27

9 votes

0 answers

407 views

Can this infinite sum for the Riemann zeta function be generalised?

asked Oct 1, 2019 at 5:21

8 votes

1 answer

572 views

Space of solutions of nonlinear Helmholtz equation on a torus

asked Sep 23, 2012 at 4:32

6 votes

0 answers

209 views

Find a symmetric polynomial with a projection divisible by a known polynomial

asked Jul 10, 2014 at 23:20

6 votes

0 answers

176 views

Area-preserving map of punctured disk to itself

asked Aug 13, 2019 at 7:49

5 votes

2 answers

402 views

Elliptic-type integral with nested radical

asked Jul 16, 2018 at 7:35

5 votes

0 answers

217 views

Automorphisms of an infinite graph built from a finite motif

asked Jul 20, 2016 at 4:30

4 votes

0 answers

64 views

Is there a classification of higher-degree generalisations of confocal conic sections?

asked May 2, 2020 at 9:40

4 votes

1 answer

349 views

Inverting convolutions over finite intervals

asked Oct 6, 2020 at 23:17

3 votes

0 answers

253 views

Can a polynomial family of curves be identified by a polynomial satisfied by its derivatives?

asked Apr 30, 2020 at 8:20

3 votes

1 answer

208 views

Inclusion of copies of an irrep as orthogonal subspaces of an induced representation

asked Aug 4, 2014 at 12:38

2 votes

1 answer

41 views

Terminology for tree subgraphs where non-neighbouring vertices are not connected by single ambient edges

asked Oct 27, 2018 at 0:23

2 votes

1 answer

112 views

When are the 3-colorings of vertex subsets uncorrelated?

asked Apr 7, 2021 at 5:06

0 votes

1 answer

406 views

Analytically continue complete elliptic integral over branch cut

asked Jul 17, 2018 at 10:53

Stack Exchange Network

18 Questions

Cubic function $\mathbb{Z}^2 \to \mathbb{Z}$ cannot be injective

When does doubling the size of a set multiply the number of subsets by an integer?

Is there a degenerate simplex in $\mathbb{R}^{8 k-1}$ with odd integer edge lengths?

Why does this antisymmetric product factor out a determinant?

Factor a sum of products of cofactors

Can this infinite sum for the Riemann zeta function be generalised?

Space of solutions of nonlinear Helmholtz equation on a torus

Find a symmetric polynomial with a projection divisible by a known polynomial

Area-preserving map of punctured disk to itself

Elliptic-type integral with nested radical

Automorphisms of an infinite graph built from a finite motif

Is there a classification of higher-degree generalisations of confocal conic sections?

Inverting convolutions over finite intervals

Can a polynomial family of curves be identified by a polynomial satisfied by its derivatives?

Inclusion of copies of an irrep as orthogonal subspaces of an induced representation

Terminology for tree subgraphs where non-neighbouring vertices are not connected by single ambient edges

When are the 3-colorings of vertex subsets uncorrelated?

Analytically continue complete elliptic integral over branch cut