User Mikhail Tikhomirov

44 votes

4 answers

2k views

Sets of unit fractions with sum $\leq 1$

asked Sep 14, 2017 at 10:16

44 votes

4 answers

2k views

A curious process with positive integers

asked Oct 13, 2018 at 20:46

17 votes

1 answer

923 views

Holes in double-tileable polynominoes

asked Dec 8, 2018 at 1:06

13 votes

1 answer

391 views

Two-player independent set game

asked Sep 26, 2017 at 23:56

10 votes

2 answers

410 views

Almost graceful tree conjecture

asked Nov 1, 2018 at 10:34

10 votes

1 answer

373 views

Making binary matrix positive semidefinite by switching signs

asked Nov 3, 2018 at 3:29

10 votes

0 answers

175 views

Largest number of simple paths between two vertices

asked Sep 16, 2020 at 23:37

9 votes

3 answers

897 views

Are real-analytic functions in $\mathbb{R}^2$ holomorphic after suitable change of coordinates?

asked Jul 28 at 9:45

7 votes

1 answer

256 views

Families of sets with parity conditions

asked Apr 12, 2022 at 0:48

7 votes

0 answers

93 views

Combinatorial region-halfplane incidence structures

asked Sep 28, 2018 at 16:46

7 votes

1 answer

349 views

Counting twin primes efficiently

asked Nov 14, 2017 at 3:55

7 votes

3 answers

410 views

Checking a generating set of $\mathbb{Z}^k$

asked Oct 8, 2017 at 23:57

7 votes

0 answers

326 views

Multidimensional hook length formula

asked Sep 19, 2017 at 21:08

6 votes

1 answer

216 views

How close $k$-sums of a random set of numbers are on average?

asked Sep 26, 2017 at 14:24

6 votes

1 answer

594 views

Prefix sums of Pascal triangle = powers of two

asked Oct 20, 2017 at 19:32

6 votes

1 answer

205 views

Categories with meaningful "core" objects

asked Oct 31, 2017 at 4:18

6 votes

0 answers

222 views

2D quadrant sandpile: emergent highway structure

asked Oct 30, 2020 at 13:26

5 votes

2 answers

200 views

Convex hull of bivariate normal random points

asked Apr 20, 2023 at 1:18

5 votes

0 answers

258 views

Nimber $2^{2^k} - 1$ is a multiplicative generator of $[2^{2^k}]$?

asked Mar 30, 2020 at 10:18

5 votes

1 answer

133 views

Unique products of integers in fixed-size intervals

asked Apr 2, 2020 at 23:33

5 votes

0 answers

230 views

On a Robin Forman's remark on combinatorial simplicial complexes

asked Nov 27, 2017 at 21:36

4 votes

0 answers

64 views

Divisor function of highly composite sets

asked Feb 12, 2018 at 21:42

4 votes

1 answer

664 views

Number of independent sets of a random tree

asked Oct 22, 2017 at 22:38

4 votes

0 answers

178 views

Modern advances in combinatorial game theory

asked Sep 10, 2017 at 9:35

4 votes

0 answers

241 views

Mistake in ONAG?

asked Sep 11, 2017 at 16:19

3 votes

1 answer

331 views

Simplifying a double sum of inverses

asked Jun 27, 2018 at 22:27

3 votes

1 answer

216 views

Typical labelled vs. unlabelled trees properties

asked Nov 6, 2018 at 7:26

3 votes

2 answers

285 views

Distinct distances between adjacent equal elements

asked Mar 26, 2020 at 9:01

2 votes

0 answers

139 views

Double Diophantine approximation

asked May 6, 2020 at 23:42

2 votes

0 answers

42 views

Shifts-induced group of a toroidal cube

asked May 25, 2019 at 4:03

Stack Exchange Network

37 Questions

Sets of unit fractions with sum $\leq 1$

A curious process with positive integers

Holes in double-tileable polynominoes

Two-player independent set game

Almost graceful tree conjecture

Making binary matrix positive semidefinite by switching signs

Largest number of simple paths between two vertices

Are real-analytic functions in $\mathbb{R}^2$ holomorphic after suitable change of coordinates?

Families of sets with parity conditions

Combinatorial region-halfplane incidence structures

Counting twin primes efficiently

Checking a generating set of $\mathbb{Z}^k$

Multidimensional hook length formula

How close $k$-sums of a random set of numbers are on average?

Prefix sums of Pascal triangle = powers of two

Categories with meaningful "core" objects

2D quadrant sandpile: emergent highway structure

Convex hull of bivariate normal random points

Nimber $2^{2^k} - 1$ is a multiplicative generator of $[2^{2^k}]$?

Unique products of integers in fixed-size intervals

On a Robin Forman's remark on combinatorial simplicial complexes

Divisor function of highly composite sets

Number of independent sets of a random tree

Modern advances in combinatorial game theory

Mistake in ONAG?

Simplifying a double sum of inverses

Typical labelled vs. unlabelled trees properties

Distinct distances between adjacent equal elements

Double Diophantine approximation

Shifts-induced group of a toroidal cube