User Fabius Wiesner

26 votes

4 answers

4k views

"Make all numbers equal" game

asked Aug 6, 2023 at 13:46

9 votes

1 answer

706 views

Sufficient condition for linear separability of a boolean function on $n$ variables

asked Jan 21 at 18:47

7 votes

2 answers

773 views

Determinant of matrix with Stirling numbers as elements

asked May 24, 2022 at 8:43

6 votes

2 answers

781 views

Conjecture about partitions of the powerset without the empty set

asked Sep 20, 2023 at 17:12

5 votes

2 answers

635 views

Minimum number of swaps to make multisets elements sums close

asked Dec 14, 2023 at 10:51

5 votes

2 answers

465 views

Minimum number of transpositions to make two multiset permutations equal

asked Dec 19, 2023 at 17:54

4 votes

0 answers

175 views

How to prove that there does not exist a union closed family of $n$ sets with all elements with frequency $(n-1)/2$

asked Sep 22, 2022 at 10:01

4 votes

0 answers

105 views

Greatest common divisors of some binomial coefficients

asked Dec 23, 2022 at 9:01

3 votes

1 answer

267 views

Analytic expression for the coefficient of a multivariate polynomial

asked Mar 26, 2022 at 16:44

3 votes

1 answer

203 views

Total number of plane partitions for $4$ or more dimensions

asked May 2, 2022 at 14:08

3 votes

2 answers

255 views

Continuous version of the union-closed sets conjecture

asked Oct 26, 2023 at 9:42

3 votes

1 answer

238 views

Property of $3$-smooth numbers

asked Jul 10, 2023 at 9:39

3 votes

0 answers

111 views

Minimum number of couples of sets with non-empty intersection in a union closed family

asked Jan 2, 2023 at 22:37

2 votes

0 answers

248 views

Another possible strengthening of the union-closed sets conjecture

asked Sep 10, 2023 at 16:38

2 votes

1 answer

154 views

How to find an example of a union-closed family with two given properties

asked Oct 31, 2022 at 12:48

2 votes

1 answer

225 views

Union closed family of sets with at most a certain number of couples of sets with non-empty intersection

asked Jan 1, 2023 at 21:45

2 votes

1 answer

148 views

Lower bound for sets couples in an union-closed family such that $A \subset B$ or $B \subset A$

asked Jul 19, 2021 at 9:25

2 votes

1 answer

192 views

Conjecture about families of subsets of $\{1,\ldots,2n+1\}$ of size $n+1$

asked Oct 10, 2023 at 16:49

1 vote

1 answer

330 views

Counting the equivalence classes of some binary matrices

asked Aug 13, 2021 at 9:44

1 vote

0 answers

80 views

Literature about graph isomorphism and incidence matrix [closed]

asked Aug 26, 2021 at 6:18

1 vote

0 answers

155 views

Given a graph, how to build another "difficult" isomorphic graph from it?

asked Sep 11, 2021 at 8:45

1 vote

1 answer

124 views

Existence of a family of sets with some properties

asked Oct 3, 2022 at 21:25

1 vote

2 answers

211 views

Do all graphs with $n$ vertices and $m$ edges have a special property?

asked Nov 14, 2022 at 22:49

1 vote

1 answer

174 views

Graphs with $n$ vertices and $m$ edges and more probable property

asked Nov 16, 2022 at 21:10

1 vote

1 answer

130 views

Number of sets of columns "connecting" top to bottom of a matrix

asked Nov 8, 2022 at 16:26

1 vote

0 answers

232 views

Closed-form solution of a particular linear program

asked Jan 15, 2023 at 22:12

1 vote

1 answer

73 views

Improving a lower bound for the minimum of the maximum frequency of an element in a family of sets

asked Feb 6, 2023 at 8:23

1 vote

0 answers

60 views

Lower bound for the minimum of the maximum frequency of an element - with restrictions

asked Feb 6, 2023 at 20:11

1 vote

1 answer

99 views

Non-isomorphic walk-regular graphs with the same number of closed walks at any length

asked Nov 9, 2023 at 14:39

1 vote

1 answer

67 views

Lower bound for the sum of the number of vertices of some subgraphs of a directed graph

asked Dec 12, 2023 at 15:57

Stack Exchange Network

40 Questions

"Make all numbers equal" game

Sufficient condition for linear separability of a boolean function on $n$ variables

Determinant of matrix with Stirling numbers as elements

Conjecture about partitions of the powerset without the empty set

Minimum number of swaps to make multisets elements sums close

Minimum number of transpositions to make two multiset permutations equal

How to prove that there does not exist a union closed family of $n$ sets with all elements with frequency $(n-1)/2$

Greatest common divisors of some binomial coefficients

Analytic expression for the coefficient of a multivariate polynomial

Total number of plane partitions for $4$ or more dimensions

Continuous version of the union-closed sets conjecture

Property of $3$-smooth numbers

Minimum number of couples of sets with non-empty intersection in a union closed family

Another possible strengthening of the union-closed sets conjecture

How to find an example of a union-closed family with two given properties

Union closed family of sets with at most a certain number of couples of sets with non-empty intersection

Lower bound for sets couples in an union-closed family such that $A \subset B$ or $B \subset A$

Conjecture about families of subsets of $\{1,\ldots,2n+1\}$ of size $n+1$

Counting the equivalence classes of some binary matrices

Literature about graph isomorphism and incidence matrix [closed]

Given a graph, how to build another "difficult" isomorphic graph from it?

Existence of a family of sets with some properties

Do all graphs with $n$ vertices and $m$ edges have a special property?

Graphs with $n$ vertices and $m$ edges and more probable property

Number of sets of columns "connecting" top to bottom of a matrix

Closed-form solution of a particular linear program

Improving a lower bound for the minimum of the maximum frequency of an element in a family of sets

Lower bound for the minimum of the maximum frequency of an element - with restrictions

Non-isomorphic walk-regular graphs with the same number of closed walks at any length

Lower bound for the sum of the number of vertices of some subgraphs of a directed graph