User Per Alexandersson

277 votes

47 answers

107k views

Examples of unexpected mathematical images

asked Aug 9, 2014 at 7:01

90 votes

14 answers

7k views

Time-saving (technology) tricks for writing papers

asked Jul 11, 2020 at 9:10

35 votes

7 answers

4k views

What problem would you base your mathcoin on?

asked Nov 27, 2014 at 22:26

31 votes

2 answers

2k views

Tiling of the plane with manholes

asked Jun 21, 2013 at 15:29

30 votes

1 answer

1k views

Mysterious symmetry - in search for a bijection

asked Feb 19, 2018 at 21:13

25 votes

5 answers

4k views

Monic polynomial with integer coefficients with roots on unit circle, not roots of unity?

asked Nov 28, 2012 at 9:07

24 votes

1 answer

632 views

Rim hook decomposition and volume of moduli spaces

asked Feb 6, 2018 at 15:11

22 votes

3 answers

3k views

Cardioid-looking curve, does it have a name?

asked Sep 15, 2020 at 19:42

20 votes

1 answer

1k views

Tiling rectangle with trominoes — an invariant

asked Jan 22, 2020 at 9:33

20 votes

1 answer

1k views

Symmetric polynomial from graphs

asked Feb 25, 2011 at 12:44

18 votes

2 answers

3k views

Is there some known way to create the Mandelbrot set (the boundary), with an iterated function system?

asked Sep 3, 2011 at 19:13

18 votes

3 answers

2k views

Silly me & Van der Waerden conjecture

asked Mar 3, 2014 at 18:36

18 votes

5 answers

2k views

Examples of research on how people perceive mathematical objects

asked Aug 7, 2014 at 14:30

17 votes

1 answer

820 views

Proof of certain $q$-identity for $q$-Catalan numbers

asked Jun 5, 2020 at 14:11

16 votes

0 answers

353 views

Combinatorial characterization of intersecting intervals in the plane

asked Oct 6, 2016 at 18:37

15 votes

3 answers

369 views

Bicoloring of $\mathbb{N}^2$, avoiding set of patterns, is the maximal limit density rational?

asked Sep 10, 2015 at 14:53

14 votes

1 answer

506 views

Subdivision of pentagon into six congruent pieces

asked Oct 31, 2016 at 2:21

14 votes

2 answers

935 views

Applications of really large numbers

asked Apr 10, 2014 at 11:27

14 votes

1 answer

548 views

Legendary extra parameters to simplify a counting problem

asked Jul 12, 2019 at 15:52

13 votes

4 answers

2k views

Undecidable puzzles

asked Aug 4, 2014 at 15:59

13 votes

1 answer

406 views

Finding combinatorial models / statistics

asked Aug 27, 2015 at 14:41

12 votes

3 answers

1k views

What exact number of domino tilings cannot be realizable?

asked Aug 8, 2014 at 10:43

12 votes

5 answers

3k views

Hausdorff dimension for invariant measure?

asked May 19, 2011 at 19:15

12 votes

3 answers

846 views

What techniques are there to prove Schur positivity?

asked Jun 15, 2017 at 21:31

11 votes

1 answer

861 views

Generalization of Schur polynomials

asked Apr 27, 2015 at 21:49

10 votes

1 answer

371 views

Convex Julia sets

asked Apr 2, 2020 at 9:14

10 votes

2 answers

517 views

Lagrange inversion for power-series with rational powers

asked Jan 5, 2022 at 9:59

9 votes

0 answers

293 views

321-avoiding and parity-alternating permutations

asked Jun 5, 2022 at 18:54

9 votes

0 answers

294 views

Symmetric function transition matrix and a non-conjecture by Clifford and Stanley

asked Mar 20, 2019 at 20:35

9 votes

2 answers

398 views

Certain signed sum over $S_n$

asked Jan 25, 2015 at 18:40

Stack Exchange Network

125 Questions

Examples of unexpected mathematical images

Time-saving (technology) tricks for writing papers

What problem would you base your mathcoin on?

Tiling of the plane with manholes

Mysterious symmetry - in search for a bijection

Monic polynomial with integer coefficients with roots on unit circle, not roots of unity?

Rim hook decomposition and volume of moduli spaces

Cardioid-looking curve, does it have a name?

Tiling rectangle with trominoes — an invariant

Symmetric polynomial from graphs

Is there some known way to create the Mandelbrot set (the boundary), with an iterated function system?

Silly me & Van der Waerden conjecture

Examples of research on how people perceive mathematical objects

Proof of certain $q$-identity for $q$-Catalan numbers

Combinatorial characterization of intersecting intervals in the plane

Bicoloring of $\mathbb{N}^2$, avoiding set of patterns, is the maximal limit density rational?

Subdivision of pentagon into six congruent pieces

Applications of really large numbers

Legendary extra parameters to simplify a counting problem

Undecidable puzzles

Finding combinatorial models / statistics

What exact number of domino tilings cannot be realizable?

Hausdorff dimension for invariant measure?

What techniques are there to prove Schur positivity?

Generalization of Schur polynomials

Convex Julia sets

Lagrange inversion for power-series with rational powers

321-avoiding and parity-alternating permutations

Symmetric function transition matrix and a non-conjecture by Clifford and Stanley

Certain signed sum over $S_n$