The one-dimensional Diophantine condition conjecture for inhomogeneous approximation

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Let ψ\psi be a monotonic approximation function, let σβ\sigma_\beta denote the Diophantine-type function associated with an irrational number β\beta, and let W(ψ,β,γ,γ′)W(\psi,\beta,\gamma,\gamma') be the set of pairs satisfying the associated inhomogeneous multiplicative approximation inequality for infinitely many integers qq.

One-dimensional Diophantine condition conjecture. Suppose that

∑q=1∞ψ(q)log⁡q(log⁡log⁡q)1/2=∞.\sum_{q=1}^{\infty} \psi(q)\frac{\log q}{(\log\log q)^{1/2}}=\infty.

If β\beta is irrational and

σβ(q)=O((log⁡log⁡q)1/2),\sigma_\beta(q)=O\bigl((\log\log q)^{1/2}\bigr),

then, for all real numbers γ,γ′\gamma,\gamma', one has

∣W(ψ,β,γ,γ′)∣=1.\lvert W(\psi,\beta,\gamma,\gamma')\rvert=1.

The statement would reduce the joint Diophantine hypothesis on (γ,β)(\gamma,\beta) appearing in the preceding results to a condition on β\beta alone. The source states it as something the authors believe, rather than as an established theorem, and gives no resolution.

References

Primary source

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

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