Fourier Dimension in Inhomogeneous Duffin--Schaeffer Conjecture
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910132537917440 |
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| author | Tan, Bo Zhou, Qing-Long |
| author_facet | Tan, Bo Zhou, Qing-Long |
| contents | Let \(Q \subseteq \mathbb{N}\) be a subset, and let \(ψ\colon \mathbb{N} \to [0, \tfrac{1}{2})\), \(θ\colon \mathbb{N} \to \mathbb{R}\) be functions. Let \(\{A_q\}\) and \(\{B_q\}\) be sequences of integers such that \(\gcd(A_q, B_q) = 1\) and \(B_q > 0\) for all \(q\). Define \(W_Q^{\ast}(ψ,θ)\) to be the set of \(x \in [0,1]\) for which \[ \left| x - \frac{p + θ(q)}{q} \right| < \frac{ψ(q)}{q} \] holds for infinitely many \((p,q) \in \mathbb{Z} \times Q\) with \(\gcd(B_q p + A_q, q) = 1\).
In this paper, we determine the Fourier dimension of \(W_Q^{\ast}(ψ,θ)\). Our result not only recovers the classical theorems of Kaufman and Bluhm (concerning the homogeneous case \(ψ(q) = q^{-τ}\) with \(τ\ge 1\)) and the one-dimensional version of a result by Cai and Hambrook on the inhomogeneous approximable set, but also provides a complete inhomogeneous generalization. Moreover, it gives an affirmative answer to the coprime formulation of the Chen--Xiong conjecture. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_13868 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Fourier Dimension in Inhomogeneous Duffin--Schaeffer Conjecture Tan, Bo Zhou, Qing-Long Number Theory Let \(Q \subseteq \mathbb{N}\) be a subset, and let \(ψ\colon \mathbb{N} \to [0, \tfrac{1}{2})\), \(θ\colon \mathbb{N} \to \mathbb{R}\) be functions. Let \(\{A_q\}\) and \(\{B_q\}\) be sequences of integers such that \(\gcd(A_q, B_q) = 1\) and \(B_q > 0\) for all \(q\). Define \(W_Q^{\ast}(ψ,θ)\) to be the set of \(x \in [0,1]\) for which \[ \left| x - \frac{p + θ(q)}{q} \right| < \frac{ψ(q)}{q} \] holds for infinitely many \((p,q) \in \mathbb{Z} \times Q\) with \(\gcd(B_q p + A_q, q) = 1\). In this paper, we determine the Fourier dimension of \(W_Q^{\ast}(ψ,θ)\). Our result not only recovers the classical theorems of Kaufman and Bluhm (concerning the homogeneous case \(ψ(q) = q^{-τ}\) with \(τ\ge 1\)) and the one-dimensional version of a result by Cai and Hambrook on the inhomogeneous approximable set, but also provides a complete inhomogeneous generalization. Moreover, it gives an affirmative answer to the coprime formulation of the Chen--Xiong conjecture. |
| title | Fourier Dimension in Inhomogeneous Duffin--Schaeffer Conjecture |
| topic | Number Theory |
| url | https://arxiv.org/abs/2604.13868 |