Year: 2026
Type: preprint
Abstract: The set of $τ$-approximable numbers, $\mathcal W(τ)$, has genuinely fractional Hausdorff dimension, whereas the set of inhomogeneously badly approximable numbers, $\Bad^γ$, has full Hausdorff dimension. We determine the Hausdorff dimension of their intersection by introducing the $Ψ$-rapid game, a scale-sensitive refinement of the rapid game of Hatefi and Simmons (preprint 2024). For every approximation function $ψ$, we prove that $\mathcal W(ψ)\cap\Bad^γ$ is strong $Ψ$-rapid winning for a natural gauge $Ψ$ determined by $ψ$. Unlike Schmidt-type games, whose winning property always implies full Hausdorff dimension, the $Ψ$-rapid game is calibrated to a prescribed Diophantine scale, so that the resulting dimension bound depends explicitly on the decay of $Ψ$. In particular, for $ψ(q)=q^{-τ}, τ\ge1,$ we recover the exact Jarník--Besicovitch dimension, that is, $$ \HD\bigl(\mathcal W(τ)\cap\Bad^γ\bigr)=\frac{2}{τ+1}.$$
Source: arXiv (Cornell University)
Authors: Hussain, Mumtaz, Simmons, David
Institution: La Trobe University
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7204475771