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The well known theorems of Khintchine and Jarn\'ik in metric Diophantine approximation provide comprehensive description of the measure theoretic properties of real numbers approximable by rational numbers with a given error. Various…

Number Theory · Mathematics 2015-05-27 Mumtaz Hussain

Let $\mathcal{C}$ be a non-degenerate planar curve. We show that the curve is of Khintchine-type for convergence in the case of simultaneous approximation with two independent approximation functions; that is if a certain sum converges then…

Number Theory · Mathematics 2007-05-23 Dzmitry Badziahin , Jason Levesley

In this paper we develop a new explicit method to studying rational points near manifolds and obtain optimal lower bounds on the number of rational points of bounded height lying at a given distance from an arbitrary non-degenerate curve.…

Number Theory · Mathematics 2018-09-18 V. Beresnevich , R. C. Vaughan , S. Velani , E. Zorin

In this paper we initiate a new approach to studying approximations by rational points to points on smooth submanifolds of $\mathbb{R}^n$. Our main result is a convergence Khintchine type theorem for arbitrary nondegenerate submanifolds of…

Number Theory · Mathematics 2023-06-12 Victor Beresnevich , Lei Yang

This work is motivated by problems on simultaneous Diophantine approximation on manifolds, namely, establishing Khintchine and Jarnik type theorems for submanifolds of R^n. These problems have attracted a lot of interest since Kleinbock and…

Number Theory · Mathematics 2016-04-01 Victor Beresnevich

We develop the theory of Diophantine approximation for systems of simultaneously small linear forms, which coefficients are drawn from any given analytic non-degenerate manifolds. This setup originates from a problem of Sprind\v{z}uk from…

Number Theory · Mathematics 2017-07-04 Victor Beresnevich , Vasili Bernik , Natalia Budarina

In metric Diophantine approximation there are two main types of approximations: simultaneous and dual for both homogeneous and inhomogeneous settings. The well known measure-theoretic theorems of Khintchine and Jarn\'ik are fundamental in…

Number Theory · Mathematics 2016-09-14 Dzmitry Badziahin , Stephen Harrap , Mumtaz Hussain

We prove the convergence case of Khintchine's theorem, with general approximation functions that are not necessarily monotonic, for analytic nonplanar manifolds over local fields of positive characteristic. Our approach is based on the…

Number Theory · Mathematics 2026-03-03 Noy Soffer Aranov , Sourav Das , Arijit Ganguly , Aratrika Pandey

In this paper we develop the convergence theory of simultaneous, inhomogeneous Diophantine approximation on manifolds. A consequence of our main result is that if the manifold $M \subset \mathbb{R}^n$ is of dimension strictly greater than…

Number Theory · Mathematics 2015-12-17 Victor Beresnevich , Robert C. Vaughan , Sanju Velani , Evgeniy Zorin

In a ground-breaking work \cite{BY}, Beresnevich and Yang recently proved Khintchine's theorem in simultaneous Diophantine approximation for nondegenerate manifolds resolving a long-standing problem in the theory of Diophantine…

Number Theory · Mathematics 2022-09-29 Shreyasi Datta

We establish a weighted simultaneous Khintchine-type theorem, both convergence and divergence, for all nondegenerate manifolds, which answers a problem posed in [Math. Ann., 337(4):769-796, 2007]. This extends the main results of [Acta…

Number Theory · Mathematics 2026-02-12 Victor Beresnevich , Shreyasi Datta , Lei Yang

The main objective of this paper is to prove a Khintchine type theorem for divergence for linear Diophantine approximation on non-degenerate manifolds, which completes earlier results for convergence.

Number Theory · Mathematics 2007-05-23 V. Beresnevich , V. Bernik , D. Kleinbock , G. A. Margulis

Point counting estimates are a key stepping stone to various results in metric Diophantine approximation. In this paper we use the quantitative non-divergence estimates originally developed by Kleinbock and Margulis to improve lower bounds…

Number Theory · Mathematics 2020-08-18 Alessandro Pezzoni

We prove a quantitative theorem for Diophantine approximation by rational points on spheres. Our results are valid for arbitrary unimodular lattices and we further prove 'spiraling' results for the direction of approximates. These results…

Number Theory · Mathematics 2022-08-01 Mahbub Alam , Anish Ghosh

The inhomogeneous metric theory for the set of simultaneously $\psi$-approximable points lying on a planar curve is developed. Our results naturally incorporate the homogeneous Khintchine-Jarnik type theorems recently established in [Ann.…

Number Theory · Mathematics 2016-04-01 Victor Beresnevich , Sanju Velani , Robert C. Vaughan

Given a monotonically decreasing $\psi: \mathbb{N} \to [0,\infty)$, Khintchine's Theorem provides an efficient tool to decide whether, for almost every $\alpha \in \mathbb{R}$, there are infinitely many $(p,q) \in \mathbb{Z}^2$ such that…

Number Theory · Mathematics 2024-03-19 Lorenz Frühwirth , Manuel Hauke

In this paper the metric theory of Diophantine approximation associated with the small linear forms is investigated. Khintchine-Groshev theorems are established along with Hausdorff measure generalization without the monotonic assumption on…

Number Theory · Mathematics 2012-12-14 Mumtaz Hussain , Simon Kristensen

We prove a Khintchine result for convergence of a multiplicative Diophantine set with restricted denominators on an arbitrary non-degenerate line. Specifically, given sequences of real numbers $\{a_n\}_{n\in\mathbb{N}},\,…

Number Theory · Mathematics 2026-02-27 Lucas Tapia

Let $\cal C$ be a non--degenerate planar curve and for a real, positive decreasing function $\psi$ let $\cal C(\psi)$ denote the set of simultaneously $\psi$--approximable points lying on $\cal C$. We show that $\cal C$ is of Khintchine…

Number Theory · Mathematics 2007-05-23 Victor Beresnevich , Detta Dickinson , Sanju Velani

In 1926 Khintchine introduced a topological argument proving the existence of uncountably many nontrivial singular linear forms of $n \geq 2$ variables. Throughout the years, this argument has been extensively modified and generalized. Most…

Number Theory · Mathematics 2026-03-30 Leo Hong , Dmitry Kleinbock , Vasiliy Neckrasov
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