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An improvement on Furstenberg's intersection problem

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Yu, H 

Abstract

In this paper, we study a problem posed by Furstenberg on intersections between × 2 , × 3 \times 2, \times 3 invariant sets. We present here a direct geometrical counting argument to revisit a theorem of Wu and Shmerkin. This argument can be used to obtain further improvements. For example, we show that if A 2 , A 3 ⊂ [ 0 , 1 ] A_2,A_3\subset [0,1] are closed and × 2 , × 3 \times 2, \times 3 invariant respectively, assuming that dim ⁡ A 2 + dim ⁡ A 3 > 1 \dim A_2+\dim A_3>1 then A 2 ∩ ( u A 3 + v ) A_2\cap (uA_3+v) is sparse (defined in this paper) and has box dimension zero uniformly with respect to the real parameters u , v u,v such that u u and u − 1 u^{-1} are both bounded away from 0 0 .

Description

Keywords

Dynamical system, binary-ternary independence, discrepancy

Journal Title

Transactions of the American Mathematical Society

Conference Name

Journal ISSN

0002-9947
1088-6850

Volume Title

374

Publisher

American Mathematical Society (AMS)

Rights

All rights reserved
Sponsorship
European Research Council (803711)