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

## TL;DR

This paper improves bounds on the Mayer-Erd"H{o}s phenomenon for Farey fractions, showing a larger range where the product of differences is non-negative, and identifying cases where it becomes negative.

## Contribution

It establishes sharper bounds for the Mayer-Erd"H{o}s phenomenon on Farey fractions, extending previous results by Erd"H{o}s.

## Key findings

- Proves the inequality $(a_l - a_k)(b_l - b_k) \\ge 0$ for l - k \\le (1/12 - o(1))n.
- Shows existence of pairs with negative product for l < k + n/4 + 5.
- Sharpens the understanding of the distribution of Farey fractions and their ordering properties.

## 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.