List questions from extremal-combinatorics

Published on 26 Mar 2026 - 20:43

186

Views

Subsets differing in at least two elements

Published on 11 Oct 2017 - 7:54

44

Views

Show thatIf f attains its maximum at some point in L, show that f is a constant function.

Published on 18 Oct 2017 - 6:28

59

Views

Color integers of finite set $M\subseteq \mathbb{N}$ so that if different $a,b$ are the same color then $a+b$ is different color. $|M|_{\max}=?$

Published on 20 Oct 2017 - 18:10

220

Views

Dense triangle free graphs with paths of length 3 between every pair of vertices

Published on 27 Mar 2026 - 2:35

159

Views

What's the Ramsey number of $r(K_3, P_m)$?

Published on 28 Mar 2026 - 0:50

53

Views

Largest size of a domination free family

Published on 05 Nov 2017 - 21:57

357

Views

Combinatorics: Number of subsets of $[n]$ so that each two have a common element

Published on 26 Mar 2026 - 13:02

86

Views

Rooks on an incomplete chessboard

Published on 16 Nov 2017 - 21:26

48

Views

Extremal graph in euclidean space

Published on 27 Mar 2026 - 2:38

1.4k

Views

If two set systems' elements all have even intersection, then the product of their cardinality is $\le 2^n$

Published on 20 Nov 2017 - 13:42

29

Views

Bound on the size of a set of a collection of functions from $[n]$ to $\mathbb{Z}$

Published on 25 Nov 2017 - 23:55

529

Views

Coin game algorithm on tree structure

Published on 27 Nov 2017 - 11:19

171

Views

Show Hadamard matrix of order $4m$ gives a $(2m-1, m-1, m-2)$ design.

Published on 26 Mar 2026 - 11:00

332

Views

Bound of the size of point set in projective plane.

Published on 25 Mar 2026 - 6:04

List Question

Removing points from a triangular array without losing information

Subsets differing in at least two elements

Show thatIf f attains its maximum at some point in L, show that f is a constant function.

Color integers of finite set $M\subseteq \mathbb{N}$ so that if different $a,b$ are the same color then $a+b$ is different color. $|M|_{\max}=?$

Dense triangle free graphs with paths of length 3 between every pair of vertices

What's the Ramsey number of $r(K_3, P_m)$?

Largest size of a domination free family

Combinatorics: Number of subsets of $[n]$ so that each two have a common element

Rooks on an incomplete chessboard

Extremal graph in euclidean space

If two set systems' elements all have even intersection, then the product of their cardinality is $\le 2^n$

Bound on the size of a set of a collection of functions from $[n]$ to $\mathbb{Z}$

Coin game algorithm on tree structure

Show Hadamard matrix of order $4m$ gives a $(2m-1, m-1, m-2)$ design.

Bound of the size of point set in projective plane.

Trending Questions

Popular # Hahtags

Popular Questions