P Erdős, E Makai Jr,
J Pach - arXiv preprint arXiv:2112.08852, 2021 - arxiv.org
Let $\{p_1,\ldots, p_n\}\subset {\Bbb {R}}^ 2$ be a separated point set, ie, any two points
have a distance at least $1 $. Let $ k\ge 1$ be an integer, and $1\le t_1<\ldots< t_k $ be real …