English

Towards BAD conjecture

Number Theory 2008-04-12 v2

Abstract

For α,β,δ[0,1],α+β=1\alpha, \beta, \delta \in [0,1], \alpha +\beta = 1 we consider sets BAD(α,β;δ)={ξ=(ξ1,ξ2)[0,1]2:,infpNmax{(plog(p+1))αpξ1,(plog(p+1))βpξ2}δ}. {\rm BAD}^* (\alpha, \beta ;\delta) = \left\{\xi = (\xi_1,\xi_2) \in [0,1]^2: ,\inf_{p\in \mathbb{N}} \max \{(p\log(p+1))^\alpha ||p\xi_1||, (p\log (p+1))^\beta ||p\xi_2||\} \ge \delta \right\}. We prove that for different (α1,β1),(α2,β2),α1+β1=α2+β2=1(\alpha_1,\beta_1), (\alpha_2,\beta_2), \alpha_1 +\beta_1 = \alpha_2 +\beta_2 = 1 and δ\delta small enough BAD(α1,β1;δ)BAD(α2,β2;δ). {\rm BAD}^* (\alpha_1, \beta_1 ;\delta) \bigcap {\rm BAD}^* (\alpha_2, \beta_2 ;\delta) \neq \varnothing . Our result is based on A. Khintchine's construction and an original method due to Y. Peres and W. Schlag.

Keywords

Cite

@article{arxiv.0712.2423,
  title  = {Towards BAD conjecture},
  author = {Nikolay G. Moshchevitin},
  journal= {arXiv preprint arXiv:0712.2423},
  year   = {2008}
}

Comments

Minor correction of errors in Lemma 2

R2 v1 2026-06-21T09:54:15.415Z