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Several important conjectures in Fractal Geometry can be summarised as follows: If the dimension of a self-similar measure in $\mathbb{R}$ does not equal its expected value, then the underlying iterated function system contains an exact…

Dynamical Systems · Mathematics 2019-09-13 Simon Baker

The Assouad and quasi-Assouad dimensions of a metric space provide information about the extreme local geometric nature of the set. The Assouad dimension of a set has a measure theoretic analogue, which is also known as the upper regularity…

Metric Geometry · Mathematics 2018-11-15 Kathryn Hare , Kevin Hare , Sascha Troscheit

In a previous paper we introduced a new `dimension spectrum', motivated by the Assouad dimension, designed to give precise information about the scaling structure and homogeneity of a metric space. In this paper we compute the spectrum…

Classical Analysis and ODEs · Mathematics 2019-06-10 Jonathan M. Fraser , Han Yu

We consider iterated function systems on the real line that consist of continuous, piecewise linear functions. Under a mild separation condition, we show that the Hausdorff and box dimensions of the attractor are equal to the minimum of 1…

Dynamical Systems · Mathematics 2023-02-10 R. D. Prokaj , P. Raith , K. Simon

In this paper, we characterize a novel separation property for IFS-attractors on complete metric spaces. Such a separation property is weaker than the strong open set condition (SOSC) and becomes necessary to reach the equality between the…

Metric Geometry · Mathematics 2017-07-11 M. A. Sánchez-Granero , M. Fernández-Martínez

Intermediate dimensions are a class of new fractal dimensions which provide a spectrum of dimensions interpolating between the Hausdorff and box-counting dimensions. In this paper, we study the intermediate dimensions of Moran sets. Moran…

Dynamical Systems · Mathematics 2024-09-11 Yali Du , Junjie Miao , Tianrui Wang , Haojie Xu

In the paper, we study the generalized $q$-dimensions of measures supported by nonautonomous attractors, which are the generalization of classic Moran sets and attractors of iterated function systems. First, we estimate the generalized…

Dynamical Systems · Mathematics 2024-11-27 Yifei Gu , Jun Jie Miao

We consider a class of planar self-affine sets which we call "box-like". A box-like self-affine set is the attractor of an iterated function system (IFS) of affine maps where the image of the unit square, [0,1]^2, under arbitrary…

Metric Geometry · Mathematics 2015-05-30 Jonathan M. Fraser

For planar self-affine sets satisfying the strong separation condition, recent work of B\'ar\'any, Hochman, and Rapaport gives mild assumptions under which the Hausdorff dimension equals the affinity dimension. In this paper, we study…

Dynamical Systems · Mathematics 2026-03-05 Balázs Bárány , Antti Käenmäki , Han Yu

We derive the almost sure Assouad spectrum and quasi-Assouad dimension of random self-affine Bedford-McMullen carpets. Previous work has revealed that the (related) Assouad dimension is not sufficiently sensitive to distinguish between…

Dynamical Systems · Mathematics 2023-06-22 Jonathan M. Fraser , Sascha Troscheit

We derive an upper bound for the Assouad dimension of visible parts of self-similar sets generated by iterated function systems with finite rotation groups and satisfying the open set condition. The bound is valid for all visible parts and…

Dynamical Systems · Mathematics 2022-03-21 Esa Järvenpää , Maarit Järvenpää , Ville Suomala , Meng Wu

We completely describe the equilibrium states of a class of potentials over the full shift which includes Falconer's singular value function for affine iterated function systems with invertible affinities. We show that the number of…

Dynamical Systems · Mathematics 2018-03-22 Jairo Bochi , Ian D. Morris

In this paper, we introduce a class of fractals named homogeneous sets based on some measure versions of homogeneity, uniform perfectness and doubling. This fractal class includes all Ahlfors-David regular sets, but most of them are…

Metric Geometry · Mathematics 2014-09-16 Fan Lü , Man-Li Lou , Zhi-Ying Wen , Li-Feng Xi

The Assouad dimension of the limit set of a geometrically finite Kleinian group with parabolics may exceed the Hausdorff and box dimensions. The Assouad \emph{spectrum} is a continuously parametrised family of dimensions which…

Dynamical Systems · Mathematics 2024-03-20 Jonathan M. Fraser , Liam Stuart

We investigate the dimension theory of inhomogeneous self-affine carpets. Through the work of Olsen, Snigireva and Fraser, the dimension theory of inhomogeneous self-similar sets is now relatively well-understood, however, almost no…

Metric Geometry · Mathematics 2013-07-26 Jonathan M. Fraser

In this paper, we are concerned with the relationship among the lower Assouad type dimensions. For uniformly perfect sets in doubling metric spaces, we obtain a variational result between two different but closely related lower Assouad…

Classical Analysis and ODEs · Mathematics 2020-03-05 Haipeng Chen , Min Wu , Yuanyang Chang

We investigate the distortion of the Assouad dimension and (regularized) spectrum of sets under planar quasiregular maps. While the respective results for the Hausdorff and upper box-counting dimension follow immediately from their…

Complex Variables · Mathematics 2024-11-18 Efstathios Konstantinos Chrontsios Garitsis

We identify a generic class of two dimensional nonstandard Hamiltonian systems which exhibit isochronous behaviour. This class of systems belongs to the two dimensional mixed Li\'enard- type equations and is obtained by generalizing the…

Exactly Solvable and Integrable Systems · Physics 2016-10-19 A. Durga Devi , R. Gladwin Pradeep , V. K. Chandrasekar , M. Lakshmanan

In this article, we provide a simple and systematic way to represent general (inhomogeneous) fractals that may look different at different scales and places. By using set-valued compression maps, we express these general fractals as…

Classical Analysis and ODEs · Mathematics 2024-06-04 Tynan Lazarus , Enrique G Alvarado , Qinglan Xia

A classical theorem of Hutchinson asserts that if an iterated function system acts on $\mathbb{R}^d$ by similitudes and satisfies the open set condition then it admits a unique self-similar measure with Hausdorff dimension equal to the…

Dynamical Systems · Mathematics 2019-09-11 Ian D. Morris , Cagri Sert