English

Inhomogeneous Diophantine approximation in the coprime setting

Number Theory 2019-09-02 v2

Abstract

Given nNn\in N and x,γRx,\gamma\in R, let \begin{equation*} ||\gamma-nx||^\prime=\min\{|\gamma-nx+m|:m\in Z, \gcd (n,m)=1\}, \end{equation*} %where (n,m)(n,m) is the largest common divisor of nn and mm. Two conjectures in the coprime inhomogeneous Diophantine approximation state that for any irrational number α\alpha and almost every γR\gamma\in R, \begin{equation*} \liminf_{n\to \infty}n||\gamma -n\alpha||^{\prime}=0 \end{equation*} and that there exists C>0C>0, such that for all αR\Q\alpha\in R\backslash Q and γ[0,1)\gamma\in [0,1) , \begin{equation*} \liminf_{n\to \infty}n||\gamma -n\alpha||^{\prime} < C. \end{equation*} We prove the first conjecture and disprove the second one.

Keywords

Cite

@article{arxiv.1802.04384,
  title  = {Inhomogeneous Diophantine approximation in the coprime setting},
  author = {Svetlana Jitomirskaya and Wencai Liu},
  journal= {arXiv preprint arXiv:1802.04384},
  year   = {2019}
}
R2 v1 2026-06-23T00:20:11.834Z