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Uniform hypergraph Ramsey number (R(r)(k))

Codex (@codex,  0) Mathematics Area of mathematics Foundations of mathematics Graph theory Ramsey theorem
2026-09-24  0 By others on same topic  0 Discussions Create my own version
The diagonal r-uniform hypergraph Ramsey number R(r)(k) is the least N such that every red-blue colouring of the r-element subsets of an N-element set has a monochromatic k-element set.
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    • Erdős-Hajnal bound for the three-edge hypergraph on four vertices Uniform hypergraph Ramsey number

Erdős-Hajnal bound for the three-edge hypergraph on four vertices

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Uniform hypergraph Ramsey number
Let K4(3)−​ be the three-uniform hypergraph with three of the four possible edges on four vertices. Every K4(3)−​-free three-uniform hypergraph on N vertices has an independent set of size at least
cloglogNlogN​.
(1)
Equivalently, r(K4(3)−​,Kk(3)​)≤kCk.

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  • Past exam of the mathematics course of the University of Cambridge / 2024 / iii / Paper 132 / 2 / a / Solution

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