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The hypergraph removal process

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abstract

Let $k\geq 2$ and fix a $k$-uniform hypergraph $\mathcal{F}$. Consider the random process that, starting from a $k$-uniform hypergraph $\mathcal{H}$ on $n$ vertices, repeatedly deletes the edges of a copy of $\mathcal{F}$ chosen uniformly at random and terminates when no copies of $\mathcal{F}$ remain. Let $R(\mathcal{H},\mathcal{F})$ denote the number of edges that are left after termination. We show that $R(\mathcal{H},\mathcal{F})=n^{k-1/\rho\pm o(1)}$, where $\rho:=(\lvert E(\mathcal{F})\rvert-1)/(\lvert V(\mathcal{F})\rvert -k)$, holds with high probability provided that $\mathcal{F}$ is strictly $k$-balanced and $\mathcal{H}$ is sufficiently dense with pseudorandom properties. Since we may in particular choose $\mathcal{F}$ and $\mathcal{H}$ to be complete graphs, this confirms the major folklore conjecture in the area in a very strong form.

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2025 1

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  • A new lower bound for the Ramsey numbers $R(3,k)$ math.CO · 2025-05-19 · conditional · none · ref 27 · internal anchor

    For every large k there exists a triangle-free graph on roughly k^2/(3 log k) vertices with no independent set of size k.