The non-Liouville inhomogeneous multiplicative approximation conjecture

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Let ψ\psi be an approximation function, and let ∣⋅∣\\|\cdot\\| denote distance to the nearest integer. For real numbers β,γ,γ′\beta,\gamma,\gamma' and (x,y)∈[0,1]2(x,y)\in[0,1]^2, write W(ψ,β,γ,γ′)W(\psi,\beta,\gamma,\gamma') for the set of pairs satisfying the corresponding inhomogeneous multiplicative approximation inequality for infinitely many integers qq.

Non-Liouville inhomogeneous multiplicative approximation conjecture. If

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

and ψ(q)=O(q−1(log⁡q)−2)\psi(q)=O\bigl(q^{-1}(\log q)^{-2}\bigr), then for every non-Liouville number γ\gamma and every real number γ′\gamma', Lebesgue almost every (x,y)∈[0,1]2(x,y)\in[0,1]^2 belongs to W(ψ,β,γ,γ′)W(\psi,\beta,\gamma,\gamma').

The source presents this as a stronger result under a non-Liouville hypothesis, while noting that the corresponding unrestricted statement is already solved. The conjecture itself remains open even under the displayed stronger decay requirement.

References

Primary source

Han Yu, “On the metric theory of multiplicative Diophantine approximation”, arXiv:2010.09004 (2022).

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