List questions from extremal-combinatorics

Published on 01 Oct 2020 - 8:55

48

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How to characterize sail-free $3$-uniform hypergraph?

Published on 25 Mar 2026 - 18:46

198

Views

Understanding Kruskal-Katona Theorem and lower shadows

Published on 07 Oct 2020 - 5:35

114

Views

Lower bound on universe size for set system with pairwise intersections of 1?

Published on 11 Oct 2020 - 10:18

665

Views

Use the Second Derivative Test to find all critical points of the function.

Published on 15 Oct 2020 - 1:46

96

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Find smallest $n$ fulfilling requirement

Published on 15 Oct 2020 - 18:25

389

Views

Prove that intersection of at least a pair of 3-member sets of {1, 2, ..., n} is equal to one.

Published on 26 Oct 2020 - 9:39

114

Views

Upper bound on number of tuples without satisfying a criterion

Published on 28 Oct 2020 - 22:01

119

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Prove alternate form of Littlewood-Offord

Published on 07 Nov 2020 - 5:01

59

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Bounding the size of the universe for sunflower

Published on 13 Nov 2020 - 1:31

55

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Max size of set that doesn't contain k+1 length chain

Published on 22 Nov 2020 - 13:59

209

Views

Least number of scalene triangles formed from $13$ points in a plane

Published on 24 Nov 2020 - 18:53

310

Views

Proof Regarding the Upper Bound of the Product $\alpha(G) \omega(G)$ in a Graph

Published on 01 Dec 2020 - 17:04

83

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Subset $A_1,..A_m$ of $\{1,2,...n\}$ where $|A_i|$ is even $\forall i$ and $|A_i \cap A_j|$ is odd when $i \neq j$, prove $m \leq n$

Published on 14 Dec 2020 - 4:39

228

Views

What is the minimum number of sets such that the product of elements in each of them is less than k?

Published on 18 Dec 2020 - 21:21

List Question

Fun, challenging graph combinatorics problem

How to characterize sail-free $3$-uniform hypergraph?

Understanding Kruskal-Katona Theorem and lower shadows

Lower bound on universe size for set system with pairwise intersections of 1?

Use the Second Derivative Test to find all critical points of the function.

Find smallest $n$ fulfilling requirement

Prove that intersection of at least a pair of 3-member sets of {1, 2, ..., n} is equal to one.

Upper bound on number of tuples without satisfying a criterion

Prove alternate form of Littlewood-Offord

Bounding the size of the universe for sunflower

Max size of set that doesn't contain k+1 length chain

Least number of scalene triangles formed from $13$ points in a plane

Proof Regarding the Upper Bound of the Product $\alpha(G) \omega(G)$ in a Graph

Subset $A_1,..A_m$ of $\{1,2,...n\}$ where $|A_i|$ is even $\forall i$ and $|A_i \cap A_j|$ is odd when $i \neq j$, prove $m \leq n$

What is the minimum number of sets such that the product of elements in each of them is less than k?

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