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arXiv · 2509.00121

Improved bounds for the Mayer-Erd\H{o}s phenomenon on similarly ordered Farey fractions

Wouter van Doorn
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Abstract

Let $\frac{a_1}{b_1}, \frac{a_2}{b_2}, \ldots$ be the Farey fractions of order $n$. We then prove that the inequality $(a_l - a_k)(b_l - b_k) \ge 0$ holds for all $k$ and $l > k$ with $l-k \le \left(\frac{1}{12} - o(1) \right)n$, sharpening an old result by Erd\H{o}s. On the other hand, we will show that for all $n \ge 4$ there are $k, l$ with $k < l < k + \frac{n}{4} + 5$ for which the product $(a_l - a_k)(b_l - b_k)$ is negative.

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Wouter van Doorn. 2025-08-28. Improved bounds for the Mayer-Erd\H{o}s phenomenon on similarly ordered Farey fractions. https://arxiv.org/abs/2509.00121

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