Fernando Argentieri
Let $γ\in(0;\frac{1}{2}),τ\geq 1$ and define the "$γ,τ$ Diophantine set" as: $$D_{γ,τ}:=\{α\in (0;1): ||qα||\geq\fracγ{q^τ}\quad\forall q\in\Bbb{N}\},\qquad||x||:=\inf_{p\in\Bbb{Z}}|x-p|. $$ In this paper we study the topology of these sets and we show that, for large $τ$ and for almost all $γ>0$, $D_{γ,τ}$ is a Cantor set.
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We prove that these Cantor sets are made up of transcendental numbers, apart from their endpoints $0$ and $1$, under some arithmetical assumptions on the data. To that purpose, we establish a criterion of linear independence over the field of algebraic numbers for the three numbers $1$, a characteristic Sturmian number, and an arbitrary Sturmian number with the same slope.
Isolated Diophantine numbers
该研究探讨丢番图数的拓扑结构，构造出同丢番图常数下的孤立丢番图数显式例子，证明丢番图集未必是康托集，并简述了这类孤立数的一般性质。
We give sufficient conditions for two Cantor sets of the line to be nested for a positive set of translation parameters. This problem occurs in diophantine approximations. It also occurs as a toy model of the parameter selection for non-uniformly hyperbolic attractors of the plane. For natural Cantors sets, we show that this condition is optimal.
Let $γ\in(0;\frac{1}{2}),τ\geq 1$ and define the "$γ,τ$ Diophantine set" as: $$D_{γ, τ}:=\{α\in (0;1): ||qα||\geq\fracγ{q^τ}\quad\forall q\in\Bbb{N}\},\qquad ||x||:=\inf_{p\in\Bbb{Z}}|x-p|.$$ We analyze the topology of these sets and we show that generally they have isolated points.
Let $m\in\mathbb N_{\ge 2}$, and let $\mathcal K=\{K_λ: λ\in(0, 1/m]\}$ be a class of Cantor sets, where $K_λ=\{\sum_{i=1}^\infty d_iλ^i: d_i\in\{0,1,\ldots, m-1\}, i\ge 1\}$. We investigate in this paper the likelyhood of a fixed point in the Cantor sets of $\mathcal K$. More precisely, for a fixed point $x\in(0,1)$ we consider the parameter set $Λ(x)=\{λ\in(0,1/m]: x\in K_λ\}$, and show that $Λ(x)$ is a topological Cantor set having zero Lebesgue measure and full Hausdorff dimension. Furthermore, by constructing a sequence of Cantor subsets with large thickness in $Λ(x)$ we prove that the in…
Schmidt games and Cantor winning sets
本文综述Schmidt博弈与Cantor获胜集的常见变体及关联，提出新的Cantor博弈以构建统一框架，并证明加倍度量空间中绝对获胜与1阶Cantor获胜等价等新结果，例证这类集合在数论与遍历理论中的普遍性。
We show that for a class of $C^2$ quasiperiodic potentials and for any Diophantine frequency, the spectrum of the corresponding Schrödinger operators is Cantor. Our approach is of purely dynamical systems, which depends on a detailed analysis of asymptotic stable and unstable directions. We also apply it to general $\mathrm{SL}(2,\mathbb R)$ cocycles, and obtain that uniform hyperbolic systems form a open and dense set in some one-parameter family.
There exist uniformly quasiregular maps $f:\mathbb{R}^3 \to \mathbb{R}^3$ whose Julia sets are wild Cantor sets.
We prove dimension formulas for arihmetic sums of regular Cantor sets, and, more generally, for images of cartesian products of regular Cantor sets by differentiable real maps.
There are no C^1-stable intersections of regular Cantor sets
我们证明了正则康托集不存在C^1-稳定交。
Rational maps with Cantor bubble Julia sets
本文研究有理映射中康托尔气泡Julia集的存在条件，构造了高周期吸引周期和二维Hausdorff维数的气泡Julia集，并给出其与康托尔圆气泡准对称等价的充分条件。
We show that two cookie-cutter Cantor sets with the same symbolic coding are differentiably equivalent if and only if their Hausdorff dimensions are equal.
Distortion results and invariant cantor sets of unimodal maps
发展了$S-$单峰映射的畸变理论。它将被用来获得一些几何的理解不变康托集。特别是吸引康托集原来有勒贝格测度为零。此外，$S-$单峰映射的遍历行为被分类根据失真性质，称为马尔可夫性质。
We consider products of two Cantor sets, and obtain the optimal estimates in terms of their thickness that guarantee that their product is an interval. This problem is motivated by the fact that the spectrum of the Labyrinth model, which is a two dimensional quasicrystal model, is given by a product of two Cantor sets. We also discuss the connection with the question on the structure of intersections of two Cantor sets, which was considered by many authors previously.
We investigate stable intersections of conformal Cantor sets and their consequences to dynamical systems. First we define this type of Cantor set and relate it to horseshoes appearing in automorphisms of $\C^2$. Then we study limit geometries, objects related to the asymptotic shape of the Cantor sets, to obtain a criterion that guarantees stable intersection between some configurations. Finally we show that the Buzzard construction of a Newhouse region on $Aut(\C^2)$ can be seem as a case of stable intersection of Cantor sets in our sense and give some (not optimal) estimative on how \say{thi…
In this paper, we give a family of rational maps whose Julia sets are Cantor circles and show that every rational map whose Julia set is a Cantor set of circles must be topologically conjugate to one map in this family on their corresponding Julia sets. In particular, we give the specific expressions of some rational maps whose Julia sets are Cantor circles, but they are not topologically conjugate to any McMullen maps on their Julia sets. Moreover, some non-hyperbolic rational maps whose Julia sets are Cantor circles are also constructed.
On the analytic self-maps of Cantor sets in the line
本文证明了直线上拓扑Cantor集的实解析满射自映射至多可数，刻画了其解析自映射的基数限制。
In this work we prove that a $C^{1+α}$-hyperbolic Cantor set contained in $S^1$, close to an affine Cantor set, is not $C^{1}$-minimal.
Let $C$ be the middle-third Cantor set. Define $C*C=\{x*y:x,y\in C\}$, where $*=+,-,\cdot,÷$ (when $*=÷$, we assume $y\neq0$). Steinhaus \cite{HS} proved in 1917 that \[ C-C=[-1,1], C+C=[0,2]. \] In 2019, Athreya, Reznick and Tyson \cite{Tyson} proved that \[ C÷C=\bigcup_{n=-\infty}^{\infty}\left[ 3^{-n}\dfrac{2}{3},3^{-n}\dfrac {3}{2}\right] . \] In this paper, we give a description of the topological structure and Lebesgue measure of $C\cdot C$. We indeed obtain corresponding results on the uniform $λ$-Cantor sets.
Multi-Model Cantor Sets
本文定义了一类新的度量空间，称之为多模Cantor集。计算了多模型康托尔集的豪斯多夫维数，证明了多模型Cantor集的Hausdorff测度是有限的且非零的.证明了从一个多模型康托尔集到另一个多模型康托尔集的bilipschitz映射在某个闭环上具有常数Radon-Nikodym导数.我们用这个来获得一个不变的bilipschitz同胚。
In the present paper, We introduce a pair of middle Cantor sets namely $(C_α, C_β)$ having stable intersection, while the product of their thickness is smaller than one. Furthermore, the arithmetic difference $C_α- λC_β$ contains at least one interval for each nonzero number $λ$.
Slow polynomial mixing, dynamical Borel-Cantelli lemma and Hausdorff dimension of dynamical diophantine sets
本文针对缓慢的多项式混合系统，建立了动力学Borel-Cantelli引理与特定动力学丢番图集Hausdorff维数的最优性结果。
Topological structure of the sum of two affine Cantor sets
该文研究仿射Cantor集和集的维数与结构性质，证明其盒维数与Hausdorff维数相等且对应Hausdorff测度有限，给出维数和不超过1时的零测结果，并刻画双递增映射仿射Cantor集和集的五种generic结构。
We show that for any pair of self-similar Cantor sets with sum of Hausdorff dimensions greater than 1, one can create an interval in the sumset by applying arbitrary small perturbations (without leaving the class of self-similar Cantor sets). In our setting the perturbations have more freedom than in the setting of the Palis conjecture, so our result can be viewed as an affirmative answer to a weaker form of the Palis conjecture.
In this paper, we construct (a) a pair of two regular Cantor sets in higher dimension which exhibits $C^1$-stable intersection and (b) a hyperbolic basic set which exhibits $C^2$-robust homoclinic tangency of the largest codimension for any higher dimensional manifold, using blenders. The former implies that an analog of Moreira's theorem on Cantor sets in the real line does not hold in higher dimension. The latter solves a question posed by Barrientos and A.Raibekas.
We study the existence of limiting laws of rare events corresponding to the entrance of the orbits on certain target sets in the phase space. The limiting laws are obtained when the target sets shrink to a Cantor set of zero Lebesgue measure. We consider both the presence and absence of clustering, which is detected by the Extremal Index, which turns out to be very useful to identify the compatibility between the dynamics and the fractal structure of the limiting Cantor set. The computation of the Extremal Index is connected to the box dimension of the intersection between the Cantor set and i…
In this paper we prove that among pairs $K,\,K' \subset \mathbb{C}$ of conformal dynamically defined Cantor sets with sum of Hausdorff dimensions $HD(K)+HD(K')>2$, there is an open and dense subset of such pairs verifying $\text{int}(K-K')\neq \emptyset$. This is motivated by the work \cite{MY}, where Moreira and Yoccoz proved a similar statement for dynamically defined Cantor sets in the real line. Here we adapt their argument to the context of conformal Cantor sets in the complex plane, this requires the introduction of several new concepts and a more detailed analysis in some parts of the a…
Hausdorff Dimension and Hausdorff Measure for Non-integer based Cantor-type Sets
我们考虑数字删除集或Cantor型集与$β$ -扩展。我们计算了这些集合的豪斯多夫维数$d$，并证明了$d$关于$β$是连续的.这些集合的$d$维Hausdorff测度是有限的正测度.
Motivated by a question of Erdős, this paper considers questions concerning the discrete dynamical system on the 3-adic integers given by multiplication by 2. Let the 3-adic Cantor set consist of all 3-adic integers whose expansions use only the digits 0 and 1. The exception set is the set of 3-adic integers whose forward orbits under this action intersects the 3-adic Cantor set infinitely many times. It has been shown that this set has Hausdorff dimension 0. Approaches to upper bounds on the Hausdorff dimensions of these sets leads to study of intersections of multiplicative translates of Can…
We show that for any two homogeneous Cantor sets with sum of Hausdorff dimensions that exceeds 1, one can create an interval in the sumset by applying arbitrary small perturbations (without leaving the class of homogeneous Cantor sets). In our setting the perturbations have more freedom than in the setting of the Palis' conjecture, so our result can be viewed as an affirmative answer to a weaker form of the Palis' conjecture. We also consider self-similar sets with overlaps on the real line (not necessarily homogeneous), and show that one can create an interval by applying arbitrary small pert…
We introduce a class of self-similar sets which we call {\em twofold Cantor sets} $K_{pq}$ in $\mathbb R$ which are totally disconnected, do not have weak separation property and at the same time have isomorphic self-similar structures.
Uniformly quasiregular maps of $\mathbb{R}^n$ with Cantor Julia sets
研究\(n\geq3\)时\(\mathbb{R}^n\)的映射，构造多项式型一致拟正则自映射，使朱利亚集为康托集。
Integer Cantor Sets: Arithmetic Combinatorial Properties
本文研究整数康托集的算术组合性质，探讨了交集性质、均匀分布、多项式均值遍历定理及度量对称相关性等核心问题。
Ratio geometry, rigidity and the scenery process for hyperbolic Cantor sets
给定一个$C^{1+γ}$双曲康托尔集$C$，研究了向$C$中一点$x$嵌套的Cantor子集序列$C_{n,x}$.证明了$C_{n,x}$渐近等于遍历康托尔集值过程.这个过程的值，称为极限集，由定义在D上的Hölder连续集值函数索引。Sullivan的对偶康托尔集。我们表明极限集本身是$C^{k+γ}, C^\infty$或$C^ω$双曲康托集，具有最高程度的光滑性，发生在$C$的$C^{1+γ}$共轭类。这个证明导致了下面的刚性定理：如果两个$C^{k+γ}, C^\infty$或$C^ω$双曲康托集是$C^1$ -共轭的，那么共轭性（具有不同的扩张）实际上已经是$C^{k+γ}, C^\infty$或$C^ω$。在一个$C^{1+γ}$共轭类内，每个光滑类是一个巴拿赫流形，它被通过重新标度子区间给出的半群作用.共轭类向下嵌套，并且包含在它们所有的交集中的是紧集，该紧集是半群的吸引子：极限集的集合。在$C^1$规范中，收敛是指数级的。
On the ternary Cantor set and Julia sets
研究三元康托集是否为有理映射的朱利亚集，通过特定方法证明其不是。
No invariant line fields on Cantor Julia sets
本文证明了具有Cantor朱利亚集的有理映射在其朱利亚集上不含不变线域.因此，具有康托朱利亚集的结构稳定的有理映射是双曲的。
n-Scrambled Cantor sets
针对 $d \ge 3$，研究构造出康托尔空间上的同胚映射，该映射有不可数 $d$-乱序集却无 $d$-乱序康托尔集，丰富了动力系统中乱序集的相关研究。
We consider (not self-similar) Cantor sets defined by a sequence of piecewise linear functions. We prove that the dimension of the harmonic measure on such a set is strictly smaller than its Hausdorff dimension. Some Hausdorff measure estimates for these sets are also provided.
For Cantor circle Julia sets of hyperbolic rational maps, we prove that they are quasisymmetrically equivalent to standard Cantor circles (i.e., connected components are round circles). This gives a quasisymmetric uniformization of all Cantor circle Julia sets of hyperbolic rational maps. By analyzing the combinatorial information of the rational maps whose Julia sets are Cantor circles, we give a computational formula of the number of the Cantor circle hyperbolic components in the moduli space of rational maps for any fixed degree. We calculate the Hausdorff dimensions of the Julia sets which…
Cantor sets in the line: scaling function and the smoothness of the shift map
考虑单位区间的$d$不相交的闭合子区间，并考虑将这些子区间中的每一个映射到整个单位区间的方向保持可扩映射。定义了这个可扩映射的所有迭代的点集是一个康托尔集。与这个康托尔集的构造相关联的是记录这个康托尔集的无限深几何的标度函数。该标度函数是$C^1$共轭的不变量。我们解决了Dennis Sullivan提出的逆问题：给定一个缩放函数，确定产生它的任何可扩映射的最大可能光滑度。
In this text, we prove then that any minimal effective dynamical system on a Cantor set $\mathcal{A}^{\mathbb{N}}$ can be simulated by a minimal $\mathbb{Z}^3$-SFT, in a sense that we explicit here. This notion is a generalization of simulation by factor and sub-action defined by Hochman.
Dimension of the harmonic measure of non-homogeneous Cantor sets
本文证明了一个保序不变型Cantor集的补集的调和测度的维数是确定这些集的参数的连续函数。这个结果推广了作者以前的结果，并且没有使用遍历的理论工具，不适用于我们的情况。
Let $T : Λ\to Λ$ be an expanding map on a Cantor set. For each suitably normalized Hölder continuous potential, we construct a spectral triple from which one may recover the associated Gibbs measure as a noncommutative measure.
We prove the existence of Cantor Julia sets with Hausdorff dimension two. In particular, such examples can be found in cubic polynomials. The proof is based on the characterization of the parameter spaces and dynamical planes of cubic polynomials by Branner-Hubbard, and the parabolic bifurcation theory developed by Shishikura in 1990s.
In this paper, we study $C^ζ$-calculus on generalized Cantor sets, which have self-similar properties and fractional dimensions that exceed their topological dimensions. Functions with fractal support are not differentiable or integrable in terms of standard calculus, so we must involve local fractional derivatives. We have generalized the $C^ζ$-calculus on the generalized Cantor sets known as middle-$ξ$ Cantor sets. We have suggested a calculus on the middle-$ξ$ Cantor sets for different values of $ξ$ with $0<ξ<1$. Differential equations on the middle-$ξ$ Cantor sets have been solved, and we …
Proof of the Branner-Hubbard conjucture on Cantor Julia sets
利用Kozlovski，Shen和van Strien构造的临界片嵌套序列，以及Kahn和Lyubich最近证明的覆盖引理，证明了多项式的朱利亚集是康托尔集当且仅当包含临界点的填充朱利亚集的每个分支是非周期的.这个结果是Branner和Hubbard在1992年提出的一个猜想。
Genus $g$ Cantor sets and germane Julia sets
本文利用康托集的亏格研究三维空间中一致拟正则映射的 Julia 集，首次构造了每点局部亏格为 $g$ 的亏格 $g$ 康托集并实现为 Julia 集，同时证明了双曲情形下康托 Julia 集亏格有限且局部亏格在稠密子集上出现。
On Sums of "Small" Cantor Sets
该研究证明了零对数容量或零下盒计数维数的“小”康托集的和可成为区间或区间有限并集，还给出了对应不同规范函数的康托集实例。
Epsilon-Distortion Complexity for Cantor Sets
我们将一个集合的ε-失真复杂度定义为在通用图灵机上运行的最短程序，该程序在豪斯多夫距离意义下以精度ε产生这个集合。然后，我们估计了迭代函数系统（IFS）所产生的线上的各种中心康托集的ε-失真复杂度。特别地，C^k康托尔集的ε-失真复杂度一般取决于k和它的盒计数维数，与多项式IFS或随机仿射康托集生成的康托集相反。
Open intervals in sums and products of Cantor sets
本文通过新论证证明足够多个任意中心康托集的和与积可产生大的开区间，并将讨论推广到其 $C^1$ 像，为 Astels 的厚度结果提供新视角，同时处理康托集幂的和与积问题。
Cantor sets in higher dimension I: Criterion for stable intersections
本文在高维空间中研究Cantor集的稳定相交判据，并提出构造显式稳定相交Cantor集的方法，适用于Hausdorff维度极小的复杂情形。
We introduce a topological object, called hairy Cantor set, which in many ways enjoys the universal features of objects like Jordan curve, Cantor set, Cantor bouquet, hairy Jordan curve, etc. We give an axiomatic characterisation of hairy Cantor sets, and prove that any two such objects in the plane are ambiently homeomorphic. Hairy Cantor sets appear in the study of the dynamics of holomorphic maps with infinitely many renormalisation structures. They are employed to link the fundamental concepts of polynomial-like renormalisation by Douady-Hubbard with the arithmetic conditions obtained by H…
In 1954 Marstrand proved that if K is a subset of R^2 with Hausdorff dimension greater than 1, then its one-dimensional projection has positive Lebesgue measure for almost-all directions. In this article, we give a combinatorial proof of this theorem when K is the product of regular Cantor sets of class C^{1+a}, a>0, for which the sum of their Hausdorff dimension is greater than 1.
We give three families of parabolic rational maps and show that every Cantor set of circles as the Julia set of a non-hyperbolic rational map must be quasisymmetrically equivalent to the Julia set of one map in these families for suitable parameters. Combining a result obtained before, we give a complete classification of the Cantor circles Julia sets in the sense of quasisymmetric equivalence. Moreover, we study the regularity of the components of the Cantor circles Julia sets and establish a sufficient and necessary condition when a component of a Cantor circles Julia set is a quasicircle.
Absorbing Cantor sets in dynamical systems: Fibonacci maps
本文证明了存在一个多项式单峰映射f：[0，1] -> [0，1]，它是1）不可重正化的（因此对于来自剩余集的每个x，$ω(x)$等于一个区间），2）$ω(c)$是康托尔集，3）对于Lebesgue的$ω(x)=ω(c)$几乎所有x.所以这样一个映射的拓扑吸引子和度量吸引子是不重合的。这就回答了米尔诺提出的一个问题。
We consider the self-similar structure of the class of generalized Cantor sets $$Γ_{\mathcal{D}}=\Big\{\sum_{n=1}^\infty d_nβ^{n}: d_n\in D_n, n\ge 1\Big\},$$ where $0<β<1$ and $D_n, n\ge 1,$ are nonempty and finite subsets of $\mathbb{Z}$. We give a necessary and sufficient condition for $Γ_{\mathcal{D}}$ to be a homogeneously generated self similar set. An application to the self-similarity of intersections of generalized Cantor sets will be given.
Let $E, F\subset \R^d$ be two self-similar sets. Under mild conditions, we show that $F$ can be $C^1$-embedded into $E$ if and only if it can be affinely embedded into $E$; furthermore if $F$ can not be affinely embedded into $E$, then the Hausdorff dimension of the intersection $E\cap f(F)$ is strictly less than that of $F$ for any $C^1$-diffeomorphism $f$ on $\R^d$. Under certain circumstances, we prove the logarithmic commensurability between the contraction ratios of $E$ and $F$ if $F$ can be affinely embedded into $E$. As an application, we show that $\dim_HE\cap f(F)<\min\{\dim_HE, \dim_…
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 $|ξ| \to \infty$.
We consider the outer billiards map with contraction outside polygons. We construct a 1-parameter family of systems such that each system has an open set in which the dynamics is reduced to that of a piecewise contraction on the interval. Using the theory of rotation numbers, we deduce that every point inside the open set is asymptotic to either a single periodic orbit (rational case) or a Cantor set (irrational case). In particular, we deduce existence of an attracting Cantor set for certain parameter values. Moreover, for a different choice of a 1-parameter family, we prove that the system i…
For a compact set $K\subset \mathbb{R}^1$ and a family $\{C_λ\}_{λ\in J}$ of dynamically defined Cantor sets sufficiently close to affine with $\text{dim}_H\, K+\text{dim}_H\, C_λ>1$ for all $λ\in J$, under natural technical conditions we prove that the sum $K+C_λ$ has positive Lebesgue measure for almost all values of the parameter $λ$. As a corollary, we show that generically the sum of two affine Cantor sets has positive Lebesgue measure provided the sum of their Hausdorff dimensions is greater than one.
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