User Adam P. Goucher

42 votes

1 answer

4k views

Mathematicians wearing hats on arbitrary total orders

asked Mar 31, 2015 at 0:52

40 votes

2 answers

3k views

Ultrafilters as a double dual

asked Mar 7, 2019 at 15:35

31 votes

1 answer

2k views

Can R^3 be expressed as a disjoint union of pairwise linked circles?

asked Jul 5, 2014 at 19:52

18 votes

2 answers

700 views

Can all unit-distance graphs have their vertices at algebraic integers?

asked Jan 26, 2015 at 1:51

16 votes

2 answers

1k views

Algebraic surface of constant width?

asked Oct 29, 2015 at 18:14

16 votes

1 answer

601 views

Is this theory decidable?

asked Nov 27, 2015 at 8:44

15 votes

2 answers

2k views

Why is weak Kőnig's lemma weaker than Kőnig's lemma?

asked Nov 1, 2019 at 21:29

14 votes

1 answer

579 views

How to roll a $p$

asked Jan 10, 2015 at 16:02

11 votes

0 answers

186 views

Iterated automorphism groups of finite groups

asked Mar 2, 2018 at 12:34

11 votes

1 answer

404 views

Traveling Salesman Problem on finite group

asked Apr 21, 2019 at 11:02

11 votes

0 answers

336 views

Lattices and stable homotopy groups of spheres

asked Aug 8, 2022 at 14:42

10 votes

1 answer

637 views

Discrete logarithm for polynomials

asked Nov 2, 2020 at 15:10

10 votes

0 answers

494 views

A lattice with Monster group symmetries

asked Jun 17, 2020 at 19:56

7 votes

1 answer

371 views

The space of skew-symmetric orthogonal matrices

asked Sep 18, 2020 at 17:25

7 votes

1 answer

146 views

Ramsey theory in infinite-dimensional projective spaces

asked Apr 27, 2020 at 10:32

7 votes

2 answers

291 views

Elements of absolute value 1 in cyclotomic extension of dyadic rationals

asked Dec 12, 2017 at 6:46

7 votes

3 answers

233 views

Ordinal-indexed transitive antichain of sets with urelements

asked Oct 16, 2015 at 14:44

7 votes

1 answer

2k views

Complexity of graph isomorphism

asked Mar 28, 2016 at 21:47

6 votes

0 answers

151 views

Upper bound on size of obstruction set for wye-delta-wye reducible graphs

asked Sep 27, 2013 at 15:04

6 votes

1 answer

117 views

Bijection from $S^2$ to itself interchanging actions of $A_5$

asked Mar 21, 2019 at 17:39

4 votes

1 answer

151 views

Incomparable NPI decision problems

asked May 17, 2018 at 14:53

3 votes

0 answers

43 views

Periodicity of density of laminated lattices

asked Mar 5, 2018 at 1:24

1 vote

1 answer

252 views

Natural bijection between sets with coloured elements?

asked Jan 20, 2014 at 15:29

1 vote

2 answers

469 views

'Positive-definite' matrices over finite fields

asked Dec 18, 2016 at 12:46

1 vote

0 answers

71 views

The invariant of a shape which determines percolation

asked Feb 20, 2017 at 17:45

Stack Exchange Network

25 Questions

Mathematicians wearing hats on arbitrary total orders

Ultrafilters as a double dual

Can R^3 be expressed as a disjoint union of pairwise linked circles?

Can all unit-distance graphs have their vertices at algebraic integers?

Algebraic surface of constant width?

Is this theory decidable?

Why is weak Kőnig's lemma weaker than Kőnig's lemma?

How to roll a $p$

Iterated automorphism groups of finite groups

Traveling Salesman Problem on finite group

Lattices and stable homotopy groups of spheres

Discrete logarithm for polynomials

A lattice with Monster group symmetries

The space of skew-symmetric orthogonal matrices

Ramsey theory in infinite-dimensional projective spaces

Elements of absolute value 1 in cyclotomic extension of dyadic rationals

Ordinal-indexed transitive antichain of sets with urelements

Complexity of graph isomorphism

Upper bound on size of obstruction set for wye-delta-wye reducible graphs

Bijection from $S^2$ to itself interchanging actions of $A_5$

Incomparable NPI decision problems

Periodicity of density of laminated lattices

Natural bijection between sets with coloured elements?

'Positive-definite' matrices over finite fields

The invariant of a shape which determines percolation