Schmidt's conjecture on intersecting weighted badly approximable sets

Let an nn-dimensional weight be a vector r=(r1,,rn)\boldsymbol{\mathbf{r}}=(r_1,\dots,r_n) with ri0r_i\geq 0 and r1++rn=1r_1+\cdots+r_n=1. A vector xRn\mathbf{x}\in\mathbb{R}^n is r\boldsymbol{\mathbf{r}}-weighted badly approximable if there exists c>0c>0 such that, for every (p1,,pn,q)Zn+1(p_1,\dots,p_n,q)\in\mathbb{Z}^{n+1} with q0q\neq 0, max1inqriqxi+pic\max_{1\leq i\leq n}|q|^{r_i}|qx_i+p_i|\geq c; denote the set of such vectors by Bad(r)\mathrm{\mathbf{Bad}}(\boldsymbol{\mathbf{r}}). Schmidt's conjecture. The two sets of weighted badly approximable vectors satisfy

Bad(1/3,2/3)Bad(2/3,1/3).\mathrm{\mathbf{Bad}}(1/3,2/3)\cap\mathrm{\mathbf{Bad}}(2/3,1/3)\neq\emptyset.

This conjecture concerns the intersection of badly approximable sets for different weights; although each weighted badly approximable set has Lebesgue measure zero and full Hausdorff dimension, the nonemptiness of this particular intersection was posed by Wolfgang M. Schmidt in 1982 and remains unresolved in the supplied source.

Sources & referencesView supporting material

Primary source

Lei Yang, “Badly approximable points on manifolds and unipotent orbits in homogeneous spaces”, arXiv:1703.03461 (2019).

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