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In his 1960 paper, Schmidt studied a quantitative type of Khintchine-Groshev theorem for general (higher) dimensions. Recently, a new proof of the theorem was found, which made it possible to relax the dimensional constraint and more…

Number Theory · Mathematics 2023-03-22 Jiyoung Han

The goal of this survey is to discuss the Quantitative non-Divergence estimate on the space of lattices and present a selection of its applications. The topics covered include extremal manifolds, Khintchine-Groshev type theorems, rational…

Number Theory · Mathematics 2020-08-24 Dmitry Kleinbock , Victor Beresnevich

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

This paper goes back to a famous problem of Mahler in metrical Diophantine approximation. The problem has been settled by Sprindzuk and subsequently improved by Alan Baker and Vasili Bernik. In particular, Bernik's result establishes a…

Number Theory · Mathematics 2008-02-14 Victor Beresnevich

We extend the parametric geometry of numbers (initiated by Schmidt and Summerer, and deepened by Roy) to Diophantine approximation for systems of $m$ linear forms in $n$ variables, and establish a new connection to the metric theory via a…

Number Theory · Mathematics 2024-03-06 Tushar Das , Lior Fishman , David Simmons , Mariusz Urbański

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

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

Let $\cS_n(\psi_1,...,\psi_n)$ denote the set of simultaneously $(\psi_1,...,\psi_n)$--approximable points in $\R^n$ and $\cSM_n(\psi)$ denote the set of multiplicatively $\psi$--approximable points in $\R^n$. Let $\cM$ be a manifold in…

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

In metric Diophantine approximation, one frequently encounters the problem of showing that a limsup set has positive or full measure. Often it is a set of points in $m$-dimensional Euclidean space, or a set of $n$-by-$m$ systems of linear…

Number Theory · Mathematics 2025-07-15 Felipe A. Ramirez

We prove $S$-arithmetic inhomogeneous Khintchine type theorems on analytic nondegenerate manifolds. The divergence case, which constitutes the main substance of this paper, is proved in the general context of Hausdorff measures using…

Number Theory · Mathematics 2020-05-14 Shreyasi Datta , Anish Ghosh

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

We solve the problem of giving sharp asymptotic bounds on the Hausdorff dimensions of certain sets of badly approximable matrices, thus improving results of Broderick and Kleinbock (preprint 2013) as well as Weil (preprint 2013), and…

Number Theory · Mathematics 2017-01-13 David Simmons

Let \Gamma be a geometrically finite tree lattice. We prove a Khintchine-Sullivan type theorem for the Hausdorff measure of the points at infinity of the tree that are well approximated by the parabolic fixed points of G. Using Bruhat-Tits…

Group Theory · Mathematics 2007-05-23 Sa'ar Hersonsky , Frederic Paulin

We extend the classical theorems of Khintchine and Schmidt in metric Diophantine approximation to the context of self-similar measures on $\mathbb{R}^d$. For this, we establish effective equidistribution of associated random walks on…

Dynamical Systems · Mathematics 2026-02-24 Timothée Bénard , Weikun He , Han Zhang

We study some problems in metric Diophantine approximation over local fields of positive characteristic.

Number Theory · Mathematics 2018-12-19 Arijit Ganguly , Anish Ghosh

In this paper we obtain the Lebesgue and Hausdorff measure results for the set of vectors satisfying infinitely many fully non-linear Diophantine inequalities. The set is associated with a class of linear inhomogeneous partial differential…

Number Theory · Mathematics 2018-04-25 Stephen Harrap , Mumtaz Hussain , Simon Kristensen

Recently, Adiceam, Beresnevich, Levesley, Velani and Zorin proved a quantitative version of the convergence case of the Khintchine-Groshev theorem for nondegenerate manifolds, motivated by applications to interference alignment. In the…

Number Theory · Mathematics 2016-10-10 Arijit Ganguly , Anish Ghosh

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

We establish a `mixed' version of a fundamental theorem of Khintchine within the field of simultaneous Diophantine approximation. Via the notion of ubiquity we are able to make significant progress towards the completion of the metric…

Number Theory · Mathematics 2013-02-15 Stephen Harrap , Tatiana Yusupova

The main goal of this note is to develop a metrical theory of Diophantine approximation within the framework of the de Mathan-Teulie Conjecture, also known as the `Mixed Littlewood Conjecture'. Let p be a prime. A consequence of our main…

Number Theory · Mathematics 2010-05-12 Yann Bugeaud , Alan Haynes , Sanju Velani