# Ill-distributed sets over global fields and exceptional sets in Diophantine Geometry

## TL;DR

This paper links the distribution of rational points in definable sets over real and global fields to a conjecture in Diophantine Geometry, proposing a new approach based on residue class distribution and inverse problems.

## Contribution

It establishes an equivalence between Wilkie's conjecture on rational points density and residue class distribution properties for definable sets, and studies an inverse problem over global fields.

## Key findings

- Density of rational points relates to residue class distribution at many primes.
- Sets with few residue classes are contained in low-degree polynomial solutions.
- Provides a new strategy to approach Wilkie's conjecture.

## Abstract

Let $K\subseteq \mathbb{R}$ be a number field. Using techniques of discrete analysis, we prove that for definable sets $X$ in $\mathbb{R}_{\exp}$ of dimension at most $2$ a conjecture of Wilkie about the density of rational points is equivalent to the fact that $X$ is badly distributed at the level of residue classes for many primes of $K$. This provides a new strategy to prove this conjecture of Wilkie. In order to prove this result, we are lead to study an inverse problem as in the works \cite{Walsh2, Walsh}, but in the context of number fields, or more generally global fields. Specifically, we prove that if $K$ is a global field, then every subset $S\subseteq \mathbb{P}^{n}(K)$ consisting of rational points of projective height bounded by $N$, occupying few residue classes modulo $\mathfrak{p}$ for many primes $\mathfrak{p}$ of $K$, must essentially lie in the solution set of a polynomial equation of degree $\ll (\log(N))^{C}$, for some constant $C$.