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Under mild conditions we show that the affinity dimension of a planar self-affine set is equal to the supremum of the Lyapunov dimensions of self-affine measures supported on self-affine proper subsets of the original set. These self-affine…

Dynamical Systems · Mathematics 2019-03-18 Ian D. Morris , Pablo Shmerkin

Let $X=\bigcup\varphi_{i}X$ be a strongly separated self-affine set in $\mathbb{R}^2$ (or one satisfying the strong open set condition). Under mild non-compactness and irreducibility assumptions on the matrix parts of the $\varphi_{i}$, we…

Metric Geometry · Mathematics 2017-12-21 Balázs Bárány , Michael Hochman , Ariel Rapaport

In this paper, we investigate the Hausdorff measure of planar dominated self-affine sets at their affinity dimension. We show that the Hausdorff measure being positive and finite is equivalent to the K\"aenm\"aki measure being a mass…

Dynamical Systems · Mathematics 2026-02-26 Balázs Bárány

An affine iterated function system is a finite collection of affine invertible contractions and the invariant set associated to the mappings is called self-affine. In 1988, Falconer proved that, for given matrices, the Hausdorff dimension…

Dynamical Systems · Mathematics 2018-05-02 Balazs Barany , Antti Kaenmaki , Henna Koivusalo

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

Under the assumption of a natural subadditive potential, the so called cylinder function, working on the symbol space we prove the existence of the ergodic invariant probability measure satisfying the equilibrium state. As an application we…

Dynamical Systems · Mathematics 2017-02-01 Antti Käenmäki

We prove that if $\mu$ is a self-affine measure in the plane whose defining IFS acts totally irreducibly on $\mathbb{RP}^1$ and satisfies an exponential separation condition, then its dimension is equal to its Lyapunov dimension. We also…

Dynamical Systems · Mathematics 2019-05-06 Michael Hochman , Ariel Rapaport

In this paper we consider affine iterated function systems in locally compact non-Archimedean field $\mathbb{F}$. We establish the theory of singular value composition in $\mathbb{F}$ and compute box and Hausdorff dimension of self-affine…

Classical Analysis and ODEs · Mathematics 2023-06-07 Yang Deng , Bing Li , Hua Qiu

In this paper, we study the Hausdorff dimension of self-similar measures and sets on the real line, where the generating iterated function system consists of some maps that share the same fixed point. In particular, we will show that out of…

Dynamical Systems · Mathematics 2025-07-09 Balázs Bárány , Manuj Verma

We study the box dimensions of self-affine sets in $\mathbb{R}^3$ which are generated by a finite collection of generalised permutation matrices. We obtain bounds for the dimensions which hold with very minimal assumptions and give rise to…

Dynamical Systems · Mathematics 2021-07-02 Jonathan M. Fraser , Natalia Jurga

For countably infinite IFSs on $\mathbb R^2$ consisting of affine contractions with diagonal linear parts, we give conditions under which the affinity dimension is an upper bound for the Hausdorff dimension and a lower bound for the lower…

Dynamical Systems · Mathematics 2026-01-14 S. van Golden , C. Kalle , S. Kombrink , T. Samuel

In this paper, exact Hausdorff dimension formulas for a class of self-affine attractors generated by affine Iterated Function Systems are derived. We consider systems containing an affine map whose $n$-th iterate is a similarity…

Dynamical Systems · Mathematics 2026-05-12 Amal P. S. , Vinod Kumar P. B. , Ramkumar P. B

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

In this article, we further develop the thermodynamic formalism of affine iterated function systems with countably many transformations by showing the existence and extending earlier characterisations of the equilibrium states of finite…

Dynamical Systems · Mathematics 2025-01-22 Antti Käenmäki , Ian D. Morris

In this paper, we study the Hausdorff and the box-counting dimensions of diagonally aligned self-affine carpets whose projections to the $x$- and $y$-axes satisfy the weak separation condition. In particular, we show that the Hausdorff…

Dynamical Systems · Mathematics 2026-05-12 Balázs Bárány , Levente David

In this paper, we study the dimension of planar self-affine sets, of which generating iterated function system (IFS) contains non-invertible affine mappings. We show that under a certain separation condition, the dimension equals to the…

Dynamical Systems · Mathematics 2023-08-02 Balázs Bárány , Viktor Körtvélyesi

In this paper we consider diagonally affine, planar IFS $\Phi=\left\{S_i(x,y)=(\alpha_ix+t_{i,1},\beta_iy+t_{i,2})\right\}_{i=1}^m$. Combining the techniques of Hochman and Feng, Hu we compute the Hausdorff dimension of the self-affine…

Dynamical Systems · Mathematics 2015-12-24 Balázs Bárány , Michał Rams , Károly Simon

We study the dimension theory of a class of planar self-affine multifractal measures. These measures are the Bernoulli measures supported on box-like self-affine sets, introduced by the author, which are the attractors of iterated function…

Dynamical Systems · Mathematics 2016-06-07 Jonathan M. Fraser

We compare the dimension of a non-invertible self-affine set to the dimension of the respective invertible self-affine set. In particular, for generic planar self-affine sets, we show that the dimensions coincide when they are large and…

Dynamical Systems · Mathematics 2024-11-27 Antti Käenmäki , Petteri Nissinen

We prove that for random affine code tree fractals the affinity dimension is almost surely equal to the unique zero of the pressure function. As a consequence, we show that the Hausdorff, packing and box counting dimensions of such systems…

Dynamical Systems · Mathematics 2016-07-27 Esa Järvenpää , Maarit Järvenpää , Meng Wu , Wen Wu
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