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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 analogy with the lower Assouad dimensions of a set, we study the lower Assouad dimensions of a measure. As with the upper Assouad dimensions, the lower Assouad dimensions of a measure provide information about the extreme local behaviour…

Metric Geometry · Mathematics 2021-07-01 Kathryn E. Hare , Sascha Troscheit

The upper and lower Assouad dimensions of a metric space are local variants of the box dimensions of the space and provide quantitative information about the `thickest' and `thinnest' parts of the set. Less extreme versions of these…

Classical Analysis and ODEs · Mathematics 2021-02-03 Kathryn E. Hare , Kevin G. Hare

The connections between quasi-Assouad dimension and tangents are studied. We apply these results to the calculation of the quasi-Assouad dimension for a class of planar self-affine sets. We also show that sets with decreasing gaps have…

Classical Analysis and ODEs · Mathematics 2019-06-27 Ignacio García , Kathryn Hare

We introduce and study bi-Lipschitz-invariant dimensions that range between the box and Assouad dimensions. The quasi-Assouad dimensions and $\theta$-spectrum are other special examples of these intermediate dimensions. These dimensions are…

Classical Analysis and ODEs · Mathematics 2020-09-09 Ignacio García , Kathryn Hare , Franklin Mendivil

We introduce a new dimension spectrum motivated by the Assouad dimension; a familiar notion of dimension which, for a given metric space, returns the minimal exponent $\alpha\geq 0$ such that for any pair of scales $0<r<R$, any ball of…

Classical Analysis and ODEs · Mathematics 2018-04-26 Jonathan M. Fraser , Han Yu

We study the dimension theory of limit sets of iterated function systems consisting of a countably infinite number of conformal contractions. Our focus is on the Assouad type dimensions, which give information about the local structure of…

Dynamical Systems · Mathematics 2024-03-14 Amlan Banaji , Jonathan M. Fraser

We introduce the generalized upper box dimension which is defined for any set, whether the set is bounded or unbounded. We study basic properties of the generalized upper box dimension. We prove that the generalized upper box and upper box…

Classical Analysis and ODEs · Mathematics 2025-10-02 Lipeng Wang , Wenxia Li

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 show that if $X$ is a uniformly perfect complete metric space satisfying the finite doubling property, then there exists a fully supported measure with lower regularity dimension as close to the lower dimension of $X$ as we wish.…

Classical Analysis and ODEs · Mathematics 2018-05-22 Antti Käenmäki , Juha Lehrbäck

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 study the Assouad and quasi-Assoaud dimensions of dominated rectangular self-affine sets in the plane. In contrast to previous work on the dimension theory of self-affine sets, we assume that the sets satisfy certain separation…

Dynamical Systems · Mathematics 2024-01-23 Jonathan M. Fraser , Alex Rutar

In this paper, we give the Assouad dimension formula and the upper bound of the lower dimension for homogeneous Moran sets under the condition $\sup_{k\ge 1}\{n_{k}\}<+\infty$. We also give the Assouad spectrum and the lower spectrum…

General Topology · Mathematics 2025-01-17 Yanzhe Li , Jun Li , Shuang Liang , Manli Lou

We consider the Assouad spectrum, introduced by Fraser and Yu, along with a natural variant that we call the `upper Assouad spectrum'. These spectra are designed to interpolate between the upper box-counting and Assouad dimensions. It is…

Classical Analysis and ODEs · Mathematics 2019-06-10 Jonathan M. Fraser , Kathryn E. Hare , Kevin G. Hare , Sascha Troscheit , Han Yu

Given a non-negative, decreasing sequence $a$ with sum $1$, we consider all the closed subsets of $[0,1]$ such that the lengths of their complementary open intervals are given by the terms of $a$, the so-called complementary sets. In this…

Classical Analysis and ODEs · Mathematics 2019-03-20 Ignacio García , Kathryn E. Hare , Franklin Mendivil

Given a positive, decreasing sequence $a,$ whose sum is $L$, we consider all the closed subsets of $[0,L]$ such that the lengths of their complementary open intervals are in one to one correspondence with the sequence $a$. The aim of this…

Classical Analysis and ODEs · Mathematics 2016-04-06 Ignacio Garcia , Kathryn Hare , Franklin Mendivil

If $X$ is a set with finite Assouad dimension, it is known that the Assouad dimension of $X-X$ does not necessarily obey any non-trivial bound in terms of the Assouad dimension of $X$. In this paper, we consider self-similar sets on the…

Dynamical Systems · Mathematics 2020-01-09 Alexandros Margaris , Eric J. Olson , James C. Robinson

The conformal Assouad dimension is the infimum of all possible values of Assouad dimension after a quasisymmetric change of metric. We show that the conformal Assouad dimension equals a critical exponent associated to the combinatorial…

Metric Geometry · Mathematics 2023-06-08 Mathav Murugan

Let $E$ be a subset of a doubling metric space $(X,d)$. We prove that for any $s\in [0, \dim_{A}E]$, where $\dim_{A}$ denotes the Assouad dimension, there exists a subset $F$ of $E$ such that $\dim_{A}F=s$. We also show that the same…

Metric Geometry · Mathematics 2016-02-09 Changhao Chen , Meng Wu , Wen Wu

We introduce the notion of pseudo-cones of metric spaces as a generalization of both of the tangent cones and the asymptotic cones. We prove that the Assouad dimension of a metric space is bounded from below by that of any pseudo-cone of…

Metric Geometry · Mathematics 2020-01-17 Yoshito Ishiki
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