Epsilon-Distortion Complexity for Cantor Sets

Distortion results and invariant cantor sets of unimodal maps

A distortion theory is developed for $S-$unimodal maps. It will be used to get some geometric understanding of invariant Cantor sets. In particular attracting Cantor sets turn out to have Lebesgue measure zero. Furthermore the ergodic behavior of $S-$unimodal maps is classified according to a distortion property, called the Markov-property.

康托集的局部单调同胚群与广义区间交换变换群中的扭曲

Distortion in the group of locally monotone homeomorphisms of a Cantor set and in the group of generalized interval exchange transformations

研究广义区间交换变换或实直线上康托子集的局部单调同胚，证明间断点数有界、共轭于特定同胚限制、在相应群中扭曲这三个条件等价。

Distortion and Tits alternative in smooth mapping class groups

In this article, we study the smooth mapping class group of a surface S relative to a given Cantor set, that is the group of isotopy classes of orientation-preserving smooth diffeomorphisms of S which preserve this Cantor set. When the Cantor set is the standard ternary Cantor set, we prove that the subgroup consisting of diffeomorphisms which are isotopic to the identity on S does not contain any distorted elements. Moreover, we prove a weak Tits alternative for these groups.

Fourier transform and expanding maps on Cantor sets

We study the Fourier transforms $\widehatμ(ξ)$ of non-atomic Gibbs measures $μ$ for uniformly expanding maps $T$ of bounded distortions on $[0,1]$ or Cantor sets with strong separation. When $T$ is totally non-linear, then $\widehatμ(ξ) \to 0$ at a polynomial rate as $|ξ| \to \infty$.