Inhomogeneous multiplicative approximation conjecture for a non-Liouville number

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Let α,γ,δ∈R{\alpha}, {\gamma}, {\delta} \in \mathbb R, with α{\alpha} irrational and not Liouville. Let ψ:N→R⩾0\psi:\mathbb N\to\mathbb R_{\geqslant 0} be decreasing and satisfy

∑n=1∞ψ(n)log⁡n=∞.\sum_{n=1}^{\infty}\psi(n)\log n=\infty.

Inhomogeneous multiplicative approximation conjecture. For almost all β∈R{\beta}\in\mathbb R, there exist infinitely many n∈Nn\in\mathbb N such that

∥nα−γ∥ ∥nβ−δ∥<ψ(n).\|n{\alpha}-{\gamma}\|\,\|n{\beta}-{\delta}\|<\psi(n).

The assertion is presented as a consequence of an inhomogeneous Duffin--Schaeffer theorem and would extend the paper's proved homogeneous-fibre result to arbitrary inhomogeneous shifts. Its resolution is not supplied in the source.

References

Primary source

Sam Chow, “Bohr sets and multiplicative diophantine approximation”, arXiv:1703.07016 (2017).

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