English

A note on the Duffin-Schaeffer conjecture

Number Theory 2013-04-03 v1

Abstract

Given a sequence of real numbers {ψ(n)}nN\{\psi(n)\}_{n\in\mathbb{N}} with 0ψ(n)<10\leq \psi(n)<1, let W(ψ)W(\psi) denote the set of x[0,1]x\in[0,1] for which xnm<ψ(n)|xn-m|<\psi(n) for infinitely many coprime pairs (n,m)N×Z(n,m)\in\mathbb{N}\times\mathbb{Z}. The purpose of this note is to show that if there exists an ϵ>0\epsilon>0 such that nNψ(n)1+ϵφ(n)n=,\sum_{n\in\mathbb{N}}\psi(n)^{1+\epsilon}\cdot\frac{\varphi(n)}{n}=\infty, then the Lebesgue measure of W(ψ)W(\psi) equals 1.

Keywords

Cite

@article{arxiv.1304.0488,
  title  = {A note on the Duffin-Schaeffer conjecture},
  author = {Liangpan Li},
  journal= {arXiv preprint arXiv:1304.0488},
  year   = {2013}
}

Comments

Accepted by the Uniform Distribution Theory journal

R2 v1 2026-06-21T23:51:49.693Z