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We prove a quantitative distortion theorem for iterated function systems that generate sets of continued fractions. As a consequence, we obtain upper and lower bounds on the Hausdorff dimension of any set of real or complex continued…

Number Theory · Mathematics 2020-02-25 Daniel Ingebretson

Definable continuous injective maps defined on definable open sets into the Euclidean spaces of the same dimension are open maps in definably complete locally o-minimal expansions of ordered groups.

Logic · Mathematics 2026-01-27 Masato Fujita

We study properties of Sobolev-type metrics on the space of immersed plane curves. We show that the geodesic equation for Sobolev-type metrics with constant coefficients of order 2 and higher is globally well-posed for smooth initial data…

Analysis of PDEs · Mathematics 2014-10-07 Martins Bruveris , Peter W. Michor , David Mumford

We determine the Hausdorff limit-set of the Euclidean hypersurfaces with large $\lambda_1$ or small extrinsic radius. The result depends on the $L^p$ norm of the curvature that is assumed to be bounded a priori, with a critical behaviour…

Differential Geometry · Mathematics 2012-10-23 Erwann Aubry , Jean-Francois Grosjean

A homemorphism between domains in $\mathbb R^n$, $n\ge 2$ is quasiconformal, with its intricate analytic and geometric consequences, if the (pointwise) linear dilatation -- a purely metric quantity -- is uniformly bounded. Gehring proved…

Functional Analysis · Mathematics 2026-04-01 Behnam Esmayli , Pekka Koskela , Khanh Nguyen

We show that, almost surely, the Hausdorff dimension $s_0$ of a random covering set is preserved under all orthogonal projections to linear subspaces with dimension $k>s_0$. The result holds for random covering sets with a generating…

Classical Analysis and ODEs · Mathematics 2015-05-11 Changhao Chen , Henna Koivusalo , Bing Li , Ville Suomala

We study the Hausdorff and box-counting dimensions of cookie-cutter-like sets formed by sequential dynamics of a finite number of expanding maps. Under some natural conditions, these dimensions turn out to be the minimum and maximum of the…

Dynamical Systems · Mathematics 2025-11-12 Victor Kleptsyn , Alexandro Luna

We compute the anomalies of the topological A and B models with target space geometry of Hitchin's generalized type. The dimension of the moduli space of generalized holomorphic maps is also computed, which turns out to be equal to the…

High Energy Physics - Theory · Physics 2007-05-23 Stefano Chiantese

We compute the Hausdorff dimension of the set of singular vectors in function fields and bound the Hausdorff dimension of the set of $\varepsilon$-Dirichlet improvable vectors in this setting. This is a function field analogue of the…

Number Theory · Mathematics 2024-12-06 Noy Soffer Aranov , Taehyeong Kim

This paper concerns the intermediate dimensions, a spectrum of dimensions that interpolate between the Hausdorff and box dimensions. Potential theoretic methods are used to produce dimension bounds for images of sets under H\"older maps and…

Metric Geometry · Mathematics 2021-10-05 Stuart A. Burrell

In this note we derive an upper bound for the Hausdorff dimension of the stable set of a hyperbolic set $\Lambda$ of a $C^2$ diffeomorphisms on a $n$-dimensional manifold. As a consequence we obtain that $\dim_H W^s(\Lambda)=n$ is…

Dynamical Systems · Mathematics 2007-05-23 Rasul Shafikov , Christian Wolf

We characterize general non-Markovian Gaussian maps which are covariant under Galilean transformations. In particular, we characterize translational and Galilean covariant maps and show that they reduce to the known Holevo result in the…

Quantum Physics · Physics 2017-09-13 Giulio Gasbarri , Marko Toroš , Angelo Bassi

This paper employs techniques from metric geometry and optimal transport theory to address questions related to the analysis of functional data on metric or metric-measure spaces, which we refer to as fields. Formally, fields are viewed as…

Metric Geometry · Mathematics 2024-01-18 Soheil Anbouhi , Washington Mio , Osman Berat Okutan

We consider digits-deleted sets or Cantor-type sets with $\beta$-expansions. We calculate the Hausdorff dimension $d$ of these sets and show that $d$ is continuous with respect to $\beta$. The $d$-dimentional Hausdorff measure of these sets…

Dynamical Systems · Mathematics 2007-07-02 Qinghe Yin

We prove that the geodesic equations of all Sobolev metrics of fractional order one and higher on spaces of diffeomorphisms and, more generally, immersions are locally well posed. This result builds on the recently established real analytic…

Differential Geometry · Mathematics 2023-12-08 Martin Bauer , Philipp Harms , Peter W. Michor

This paper investigates the Hausdorff measure of certain sets of generics in computability theory. Let $\Gamma$ be the Turing ideal in which we take the dense open sets. The set of $\Gamma$-Cohen generics has measure positive if and only if…

Logic · Mathematics 2026-03-11 Yiping Miao

We prove local and global invertibility of Sobolev solutions of certain differential inclusions which prevent the differential matrix from having negative eigenvalues. Our results are new even for quasiregular mappings in two dimensions.

Classical Analysis and ODEs · Mathematics 2011-07-07 Leonid V. Kovalev , Jani Onninen

In this note we connect Sobolev estimates in the context of polynomial averages e.g. \[ \| \int_0^1 \prod_{k=1}^m f_k(x-t^k) \|_{1} \leq \text{Const} \cdot 2^{-\text{const} \cdot l} \prod_{i=1}^m \| f_k \|_m \] whenever some $f_i$ vanishes…

Classical Analysis and ODEs · Mathematics 2025-08-11 Ben Krause

For certain families of complex maps, we give a formula for the Hausdorff dimension of the equilibrium measure. In particular, given an endomorphism $f$ of $\mathbb C\mathbb P^k$ of algebraic degree $d \ge2$, and given the equilibrium…

Dynamical Systems · Mathematics 2024-04-24 Snir Ben Ovadia , Yan Mary He

Dobi\'nski set $\mathcal{D}$ is an exceptional set for a certain infinite product identity, whose points are characterized as having exceedingly good approximations by dyadic rationals. We study the Hausdorff dimension and logarithmic…

Number Theory · Mathematics 2019-11-15 Alberto Dayan , José L. Fernández , María J. González