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Pré-Publication, Document De Travail Année : 2021

Almost sharp bounds on the number of discrete chains in the plane

Nora Frankl
  • Fonction : Auteur
Andrey Kupavskii

Résumé

The following generalisation of the Erd\H{o}s unit distance problem was recently suggested by Palsson, Senger and Sheffer. Given $k$ positive real numbers $\delta_1,\dots,\delta_k$, a $(k+1)$-tuple $(p_1,\dots,p_{k+1})$ in $\mathbb{R}^d$ is called a $(\delta,k)$-chain if $\|p_j-p_{j+1}\| = \delta_j$ for every $1\leq j \leq k$. What is the maximum number $C_k^d(n)$ of $(k,\delta)$-chains in a set of $n$ points in $\mathbb{R}^d$, where the maximum is taken over all $\delta$? Improving the results of Palsson, Senger and Sheffer, we essentially determine this maximum for all $k$ in the planar case. error term It is only for $k\equiv 1$ (mod) $3$ that the answer depends on the maximum number of unit distances in a set of $n$ points. We also obtain almost sharp results for even $k$ in $3$ dimension.

Dates et versions

hal-03236597 , version 1 (26-05-2021)

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Nora Frankl, Andrey Kupavskii. Almost sharp bounds on the number of discrete chains in the plane. 2021. ⟨hal-03236597⟩
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