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For Borel subsets A and B of the Euclidean n-space the intersection of A with generic rotations and translations of B has often Hausdorff dimension at least dim A + dim B - n. Estimates for the exceptional set of rotations are derived.

Metric Geometry · Mathematics 2018-01-03 Pertti Mattila

Let $A$ and $B$ be Borel subsets of the Euclidean $n$-space with $\dim A + \dim B > n$. This is a survey on the question: what can we say about the Hausdorff dimension of the intersections $A\cap (g(B)+z)$ for generic orthogonal…

Classical Analysis and ODEs · Mathematics 2023-08-30 Pertti Mattila

In this work we reproduce the characterization of $\Gg^s$-sets from the euclidean setting [J. London Math. Soc. 49:267-280,1994] to more general metric spaces. These sets have Hausdorff dimension at least $s$ and are closed by countable…

Metric Geometry · Mathematics 2021-06-10 Felipe Negreira , Emiliano Sequeira

We establish formulas for bounds on the Haudorff measure of the intersection of certain Cantor sets with their translates. As a consequence we obtain a formula for the Hausdorff dimensions of these intersections.

Metric Geometry · Mathematics 2012-06-25 Steen Pedersen , Jason D. Phillips

Basic properties of Hausdorff content, dimension, and measure of subsets of metric spaces are discussed, especially in connection with Lipschitz mappings and topological dimension.

Classical Analysis and ODEs · Mathematics 2010-08-17 Stephen Semmes

This article is a study guide for ``On the Hausdorff dimension of Furstenberg sets and orthogonal projections in the plane" by Orponen and Shmerkin. We begin by introducing Furstenberg set problem and exceptional set of projections and…

Classical Analysis and ODEs · Mathematics 2024-06-10 Jacob B. Fiedler , Guo-Dong Hong , Donggeun Ryou , Shukun Wu

We begin with a brief treatment of Hausdorff measure and Hausdorff dimension. We then explain some of the principal results in Diophantine approximation and the Hausdorff dimension of related sets, originating in the pioneering work of…

Number Theory · Mathematics 2007-05-23 M. Maurice Dodson , Simon Kristensen

We review the motivation and fundamental properties of the Hausdorff dimension of metric spaces and illustrate this with a number of examples, some of which are expected and well-known. We also give examples where the Hausdorff dimension…

Dynamical Systems · Mathematics 2007-08-21 Dierk Schleicher

This paper studies the Hausdorff dimension of the intersection of isotropic projections of subsets of $\mathbb{R}^{2n}$, as well as dimension of intersections of sets with isotropic planes. It is shown that if $A$ and $B$ are Borel subsets…

Metric Geometry · Mathematics 2020-01-17 Fernando Roman-Garcia

In this survey article, we explore a central theme in Diophantine approximation inspired by a celebrated result of Besicovitch on the Hausdorff dimension of well approximable real numbers. We outline some of the key developments stemming…

Number Theory · Mathematics 2025-09-18 Victor Beresnevich , Sanju Velani

The behavior of the Hausdorff dimension of a set when projected onto a subspace is a fundamental question in fractal geometry. In this paper, we settle a question of Fassler and Orponen concerning the dimension of a set when projected onto…

Metric Geometry · Mathematics 2020-01-01 D. M. Stull

We show that the set of numbers that are $Q$-distribution normal but not simply $Q$-ratio normal has full Hausdorff dimension. It is further shown under some conditions that countable intersections of sets of this form still have full…

Number Theory · Mathematics 2014-04-17 Bill Mance

We study the family of vertical projections whose fibers are right cosets of horizontal planes in the Heisenberg group, $\mathbb{H}^n$. We prove lower bounds for Hausdorff dimension distortion of sets under these mappings, with respect to…

Metric Geometry · Mathematics 2022-10-11 Terence L. J. Harris , Chi N. Y. Huynh , Fernando Roman-Garcia

We are going to introduce a new algebraic, analytic structure that is a kind of generalization of the Hausdorff dimension and measure. We give many examples and study the basic properties and relations of such systems.

Classical Analysis and ODEs · Mathematics 2019-06-18 Attila Losonczi

The classical Besicovitch-Federer projection theorem implies that the d-dimensional Hausdorff measure of a set in Euclidean space with non-negligible d-unrectifiable part will strictly decrease under orthogonal projection onto almost every…

Functional Analysis · Mathematics 2017-10-11 Harrison Pugh

An approach is given for estimating the Hausdorff dimension of the univoque set of a self-similar set. This sometimes allows us to get the exact Hausdorff dimensions of the univoque sets.

Dynamical Systems · Mathematics 2017-08-21 Xiu Chen , Kan Jiang , Wenxia Li

We study parametrized families of orthogonal projections for which the dimension of the parameter space is strictly less than that of the Grassmann manifold. We answer the natural question of how much the Hausdorff dimension may decrease by…

Classical Analysis and ODEs · Mathematics 2014-10-22 Esa Järvenpää , Maarit Järvenpää , Tamás Keleti

For $S_g(x,y)=x-g(y), x,y\in\mathbb{R}^n, g\in O(n),$ we investigate the Lebesgue measure and Hausdorff dimension of $S_g(A)$ given the dimension of $A$, both for general Borel subsets of $\mathbb{R}^{2n}$ and for product sets.

Classical Analysis and ODEs · Mathematics 2020-09-28 Pertti Mattila

Intermediate dimensions were recently introduced to interpolate between the Hausdorff and box-counting dimensions of fractals. Firstly, we show that these intermediate dimensions may be defined in terms of capacities with respect to certain…

Classical Analysis and ODEs · Mathematics 2021-05-21 Stuart A. Burrell , Kenneth J. Falconer , Jonathan M. Fraser

We consider limit sets of some conformal iterated function systems, and introduce classes of subsets of the limit set, with the property that the classes are closed under countable intersections and all sets in the classes have large…

Dynamical Systems · Mathematics 2009-12-07 David Färm , Tomas Persson
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