Higher-dimensional inhomogeneous multiplicative Gallagher conjecture

Let m,d1m,d\geq1 be integers, let Ψ:Zm(0,)\Psi:\mathbb Z^m\to(0,\infty), and fix \bftheta\Id\bftheta\in\I^d. For X=(x(1),,x(d))\ImdX=(\mathbf x^{(1)},\ldots,\mathbf x^{(d)})\in\I^{md}, define \WWΨ,\bfthetamd\WW^{md}_{\Psi,\bftheta} by the condition

i=1dqx(i)θi<Ψ(q)\prod_{i=1}^d\|\mathbf q\cdot\mathbf x^{(i)}-\theta_i\|<\Psi(\mathbf q)

for infinitely many qZm{0}\mathbf q\in\mathbb Z^m\setminus\{\mathbf0\}. Let q|\mathbf q| be the sup norm. Higher-dimensional inhomogeneous multiplicative Gallagher conjecture. If Ψ(q)=ψ(q)\Psi(\mathbf q)=\psi(|\mathbf q|) for a monotonic function ψ\psi, then

\HHmd(\WWΨ,\bfthetamd)=1\HH^{md}(\WW^{md}_{\Psi,\bftheta})=1

whenever qZm{0}Ψm(q)logd1(q)\sum_{\mathbf q\in\mathbb Z^m\setminus\{\mathbf0\}}\Psi^m(\mathbf q)\log^{d-1}(|\mathbf q|) diverges. Apart from the homogeneous zero–one law, the paper states that no corresponding theory was known, so this is an open higher-dimensional extension.

Sources & referencesView supporting material

Primary source

Mumtaz Hussain and David Simmons, “The Hausdorff measure version of Gallagher's theorem – closing the gap and beyond”, arXiv:1612.00139 (2017).

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