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Marstrand's celebrated projection theorem gives the Hausdorff dimension of the orthogonal projection of a Borel set in Euclidean space for almost all orthogonal projections. It is straightforward to see that sets for which the Fourier and…

Classical Analysis and ODEs · Mathematics 2024-06-21 Jonathan M. Fraser , Ana E. de Orellana

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 consider several classical results related to the Hausdorff dimension of exceptional sets of orthogonal projections and try to find out whether they have reasonable formulations in terms of packing dimension. We also investigate the…

Classical Analysis and ODEs · Mathematics 2015-05-19 Tuomas Orponen

We describe some recent results on the dimensions of linear projections of self-affine fractals, focusing in particular on an upper bound for the dimension of the projected image. We give a self-contained treatment of this bound and…

Dynamical Systems · Mathematics 2025-03-11 Ian D. Morris

In this paper we prove some lower bounds on the Hausdorff dimension of sets of Furstenberg type. Moreover, we extend these results to sets of generalized Furstenberg type, associated to doubling dimension functions. With some additional…

Classical Analysis and ODEs · Mathematics 2009-11-18 Ursula Molter , Ezequiel Rela

We fully resolve the Furstenberg set conjecture in $\mathbb{R}^2$, that a $(s, t)$-Furstenberg set has Hausdorff dimension $\ge \min(s+t, \frac{3s+t}{2}, s+1)$. As a result, we obtain an analogue of Elekes' bound for the discretized…

Classical Analysis and ODEs · Mathematics 2025-01-22 Kevin Ren , Hong Wang

In this paper we come up with a dual version of the Furstenberg problem and obtain partial results via $L^p$ estimates of orthogonal projections. Examples are also discussed. Moreover, compared with general sets, we find that special…

Classical Analysis and ODEs · Mathematics 2024-12-10 Longhui Li , Bochen Liu

We generalize Bourgain's discretized projection theorem to higher rank situations. Like Bourgain's theorem, our result yields an estimate for the Hausdorff dimension of the exceptional sets in projection theorems formulated in terms of…

Classical Analysis and ODEs · Mathematics 2018-05-10 Weikun He

We study the projections in vector spaces over finite fields. We prove finite fields analogues of the bounds on the dimensions of the exceptional sets for Euclidean projection mapping. We provide examples which do not have exceptional…

Classical Analysis and ODEs · Mathematics 2017-07-31 Changhao Chen

We resolve a conjecture of F\"assler and Orponen on the dimension of exceptional projections to one-dimensional subspaces indexed by a space curve in $\mathbb{R}^3$. We do this by obtaining sharp $L^p$ bounds for a variant of the Wolff…

Classical Analysis and ODEs · Mathematics 2024-10-29 Malabika Pramanik , Tongou Yang , Joshua Zahl

In this paper we use the theory of computing to study fractal dimensions of projections in Euclidean spaces. A fundamental result in fractal geometry is Marstrand's projection theorem, which shows that for every analytic set E, for almost…

Computational Complexity · Computer Science 2021-11-15 Neil Lutz , D. M. Stull

We study the $\delta$-discretized Szemer\'edi-Trotter theorem and Furstenberg set problem. We prove sharp estimates for both two problems assuming tubes satisfy some spacing condition. For both two problems, we construct sharp examples that…

Classical Analysis and ODEs · Mathematics 2022-07-05 Yuqiu Fu , Shengwen Gan , Kevin Ren

The study of many problems in additive combinatorics, such as Szemer\'edi's theorem on arithmetic progressions, is made easier by first studying models for the problem in F_p^n for some fixed small prime p. We give a number of examples of…

Number Theory · Mathematics 2007-05-23 Ben Green

In the paper, there are new found methods to determine the range of every exceptional element in exceptional set, we can solve Twin primes problem and Goldbach Conjecture problem basically.

General Mathematics · Mathematics 2007-05-23 Goldtwe Anihc , Baishi Wang

We prove finite-field analogs of Bourgain's projection theorem in higher dimensions. In particular, for a certain range of parameters we improve on an exceptional set estimate by Chen in all dimensions and codimensions.

Classical Analysis and ODEs · Mathematics 2026-04-16 Alex Rose

We prove a generalization of a result of Peres and Schlag on the dimensions of certain exceptional sets of projections and then apply it to a geometric problem.

Classical Analysis and ODEs · Mathematics 2011-07-26 Daniel M. Oberlin

We give a lower bound for the size of a subset of $\mathbb F_q^n$ containing a rich k-plane in every direction, a k-plane Furstenberg set. The chief novelty of our method is that we use arguments on non-reduced subschemes and flat families…

Algebraic Geometry · Mathematics 2016-10-05 Jordan S. Ellenberg , Daniel Erman

We bound double sums of Kloosterman sums over a finite field ${\mathbb F}_{q}$, with one or both parameters ranging over an affine space over its prime subfield ${\mathbb F}_p \subseteq {\mathbb F}_{q} $. These are finite fields analogues…

Number Theory · Mathematics 2019-03-26 Simon Macourt , Igor E. Shparlinski

We consider a finite fields version of the Erd\H{o}s-Falconer distance problem for two different sets. In a certain range for the sizes of the two sets we obtain results of the conjectured order of magnitude.

Number Theory · Mathematics 2012-11-26 Rainer Dietmann

We establish a version of the Furstenberg-Katznelson multi-dimensional Szemer\'edi in the primes ${\mathcal P} := \{2,3,5,\ldots\}$, which roughly speaking asserts that any dense subset of ${\mathcal P}^d$ contains constellations of any…

Number Theory · Mathematics 2013-12-03 Terence Tao , Tamar Ziegler
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