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We study the distortion of intermediate dimension under supercritical Sobolev mappings and also under quasiconformal or quasisymmetric homeomorphisms. In particular, we extend to the setting of intermediate dimensions both the…

Metric Geometry · Mathematics 2026-01-01 Jonathan M. Fraser , Jeremy T. Tyson

We resolve a long-standing open problem posed by Federer concerning the rectifiability of the integral geometric measure with exponent p >1, thereby settling a question that has persisted since its formulation. While the main theorem is…

Metric Geometry · Mathematics 2025-08-12 Emanuele Tasso

We establish a "low rank property" for Sobolev mappings that pointwise solve a first order nonlinear system of PDEs, whose smooth solutions have the so-called "contact property". As a consequence, Sobolev mappings from an open set of the…

Analysis of PDEs · Mathematics 2013-02-15 Valentino Magnani , Jan Malý , Samuele Mongodi

We collect geometric properties of the all-genus real Gromov-Witten theory and provide updates on its development since its introduction in 2015. We bring attention to a modification of the original construction of this theory which is…

Symplectic Geometry · Mathematics 2023-11-21 Penka Georgieva , Aleksey Zinger

We review a selection of the literature on the distortion of metric notions of dimension under quasiconformal, quasisymmetric, and Sobolev mappings. Our story begins with Gehring's landmark 1973 higher integrability theorem for…

Metric Geometry · Mathematics 2026-03-13 Jeremy T. Tyson

We study conformal mappings in the Grushin plane and provide a number of their characterizations in terms of the Sobolev mappings and their geometry. Furthermore, we connect conformality on the Grushin plane with conformality on the complex…

Complex Variables · Mathematics 2024-05-28 Marcin Walicki

We give a characterization of metric space valued Sobolev maps in terms of weak* derivatives. This corrects a previous result by Haj{\l}asz and Tyson.

Functional Analysis · Mathematics 2024-11-26 Paul Creutz , Nikita Evseev

We determine the extent to which certain classes of fractionally `smooth' continuous mappings between metric spaces distort various dimensions, including the Hausdorff, upper Minkowski (box-counting), and upper intermediate dimensions. Our…

Classical Analysis and ODEs · Mathematics 2025-10-16 Ryan Alvarado , Efstathios Konstantinos Chrontsios Garitsis

We study the pullback theorem of Sobolev mappings on Carnot groups via mollification of mappings. With the pullback theorem we extend the classical result proved by Xiangdong Xie : Rigidity of Sobolev mappings $W^{1,p}(G_1;G_2)$ for…

Metric Geometry · Mathematics 2026-02-03 Yihan Cui

We survey some recent results and open questions on the approaching geodesics property and its application to the study of the Gromov and horofunction compactifications of a proper geodesic Gromov metric space. We obtain results on the…

Complex Variables · Mathematics 2025-01-13 Leandro Arosio , Matteo Fiacchi

In this paper we study global distance estimates and uniform local volume estimates in a large class of sub-Riemannian manifolds. Our main device is the generalized curvature dimension inequality introduced by the first and the third author…

Differential Geometry · Mathematics 2014-07-31 Fabrice Baudoin , Michel Bonnefont , Nicola Garofalo , Isidro H. Munive

The main goal of this paper is to develop a concept of approximate differentiability of higher order for subsets of the Euclidean space that allows to characterize higher order rectifiable sets, extending somehow well known facts for…

Classical Analysis and ODEs · Mathematics 2020-07-20 Mario Santilli

We introduce and study a notion of relative 1-homotopy type for Sobolev maps from a surface to a metric space spanning a given collection of Jordan curves. We use this to establish the existence and local H\"older regularity of area…

Differential Geometry · Mathematics 2021-01-01 Elefterios Soultanis , Stefan Wenger

In this paper, we develop the theory of Sobolev spaces on locally finite graphs, including completeness, reflexivity, separability, and Sobolev inequalities. Since there is no exact concept of dimension on graphs, classical methods that…

Analysis of PDEs · Mathematics 2023-06-28 Mengqiu Shao , Yunyan Yang , Liang Zhao

We prove an estimate on the Hausdorff-dimension of the set of two-sided boundary points of general Sobolev-extension domains on Euclidean spaces. We also present examples showing lower bounds on possible dimension estimates of this type.

Classical Analysis and ODEs · Mathematics 2021-11-02 Miguel García-Bravo , Tapio Rajala , Jyrki Takanen

We explain and generalise a construction due to Gromov to realise geometric small cancellation groups over graphs of groups as fundamental groups of non-positively curved 2-dimensional complexes of groups. We then give conditions so that…

Group Theory · Mathematics 2014-02-07 Alexandre Martin

The Gromov-Hausdorff distance provides a metric on the set of isometry classes of compact metric spaces. Unfortunately, computing this metric directly is believed to be computationally intractable. Motivated by applications in shape…

Geometric Topology · Mathematics 2016-10-20 Soledad Villar , Afonso S. Bandeira , Andrew J. Blumberg , Rachel Ward

We study the (Ahlfors regular) conformal dimension of the boundary at infinity of Gromov hyperbolic groups which split over elementary subgroups. If such a group is not virtually free, we show that the conformal dimension is equal to the…

Metric Geometry · Mathematics 2022-08-23 Matias Carrasco , John M. Mackay

We prove the existence of locally distance increasing maps with it controllable small curvatures

Differential Geometry · Mathematics 2023-07-10 Misha Gromov

We present a new general framework for metrization of Gromov-Hausdorff-type topologies on non-compact metric spaces. We also give easy-to-check conditions for separability and completeness and hence the measure theoretic requirements are…

Metric Geometry · Mathematics 2025-09-08 Ryoichiro Noda