User Mikhail Tikhomirov

15 votes

A conjecture harmonic numbers

answered Nov 20, 2020 at 8:41

13 votes

Accepted

divisibility independence

answered Sep 12, 2017 at 19:06

11 votes

A permutation problem

answered Jun 26, 2018 at 13:35

11 votes

Accepted

Union closed conjecture induction

answered Nov 1, 2020 at 0:13

10 votes

Generating function in graph theory

answered Dec 5, 2017 at 6:10

10 votes

Accepted

The fraction $\frac{g_{\mu}}{f_{\lambda}}$ is an integer

answered Apr 28, 2022 at 0:26

9 votes

Accepted

Linear equations with absolute values

answered Nov 5, 2017 at 21:01

8 votes

Accepted

Spanning $k$-trees

answered Sep 24, 2017 at 4:31

8 votes

Accepted

Matrix obtained by recursive multiplication and a cyclic permutation

answered Nov 25, 2020 at 20:26

7 votes

Accepted

Closed form for $\sum_{j=0}^{\infty}{\alpha \choose j} {\beta \choose j}x^j$

answered Nov 16, 2020 at 5:33

7 votes

Accepted

Replacing maximum degree with degeneracy in Reed's conjecture

answered Oct 31, 2020 at 1:55

7 votes

Accepted

Are regular graphs the hardest instance for graph isomorphism?

answered Sep 16, 2017 at 16:59

6 votes

Accepted

Conditional probability that a random spanning tree contains the edge e

answered Oct 26, 2017 at 3:42

6 votes

Combinatorial proof of a certain binomial identity

answered Mar 10 at 20:57

6 votes

Accepted

Bijective proof of recurrence for rooted unlabeled trees

answered Nov 27, 2021 at 11:32

6 votes

Accepted

In search of a combinatorial proof on particular set of partitions

answered Apr 4, 2022 at 21:55

5 votes

Accepted

Different form of edge coloring

answered Nov 4, 2017 at 11:20

5 votes

Accepted

Spanning tree minimizing $F_T = \sum_{i = 1}^{|V| - 1|} (w(e_i) - P_T)^2$

answered Oct 15, 2017 at 8:22

5 votes

Accepted

Is this problem of selecting points NP-hard?

answered Sep 11, 2017 at 22:32

4 votes

Accepted

Automorphism of the transfinite rooted binary tree

answered Oct 19, 2017 at 15:58

4 votes

Accepted

Some doubts on the algorithm of graph isomorphism of bounded degree graph

answered Oct 20, 2017 at 18:19

4 votes

Accepted

Roots of $\omega$, larger $\gamma$-numbers

answered Oct 26, 2017 at 15:56

4 votes

Accepted

Counting particular Dyck paths

answered Nov 2, 2017 at 21:08

4 votes

Accepted

Mean minimum distance for M and N uniformly random points on reals between 0 and 1

answered Nov 10, 2017 at 3:10

4 votes

Is there a formula for the number of st-dags (DAG with 1 source and 1 sink) with n vertices?

answered Jun 16, 2021 at 19:46

3 votes

Binomial Coefficients sum

answered Nov 16, 2020 at 15:43

3 votes

Accepted

Set of strings $S$ such that no string from $S$ is a substring of another one

answered Aug 20, 2018 at 21:00

3 votes

Accepted

The Kronecker product of two bipartite graphs' biadjacency matrices: what's it called?

answered Sep 29, 2018 at 7:49

3 votes

Blocking $a\to b\to c$ in a DAG with bounded degrees

answered Oct 8, 2018 at 5:24

3 votes

Random reflections unexpectedly produce banded distributions

answered Oct 29, 2018 at 1:17

Stack Exchange Network

49 Answers

A conjecture harmonic numbers

divisibility independence

A permutation problem

Union closed conjecture induction

Generating function in graph theory

The fraction $\frac{g_{\mu}}{f_{\lambda}}$ is an integer

Linear equations with absolute values

Spanning $k$-trees

Matrix obtained by recursive multiplication and a cyclic permutation

Closed form for $\sum_{j=0}^{\infty}{\alpha \choose j} {\beta \choose j}x^j$

Replacing maximum degree with degeneracy in Reed's conjecture

Are regular graphs the hardest instance for graph isomorphism?

Conditional probability that a random spanning tree contains the edge e

Combinatorial proof of a certain binomial identity

Bijective proof of recurrence for rooted unlabeled trees

In search of a combinatorial proof on particular set of partitions

Different form of edge coloring

Spanning tree minimizing $F_T = \sum_{i = 1}^{|V| - 1|} (w(e_i) - P_T)^2$

Is this problem of selecting points NP-hard?

Automorphism of the transfinite rooted binary tree

Some doubts on the algorithm of graph isomorphism of bounded degree graph

Roots of $\omega$, larger $\gamma$-numbers

Counting particular Dyck paths

Mean minimum distance for M and N uniformly random points on reals between 0 and 1

Is there a formula for the number of st-dags (DAG with 1 source and 1 sink) with n vertices?

Binomial Coefficients sum

Set of strings $S$ such that no string from $S$ is a substring of another one

The Kronecker product of two bipartite graphs' biadjacency matrices: what's it called?

Blocking $a\to b\to c$ in a DAG with bounded degrees

Random reflections unexpectedly produce banded distributions