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This paper is devoted to the study of mappings in metric spaces. We investigate mappings satisfying inverse moduli inequalities. We show that under certain conditions on these mappings, their definition domains and the spaces in which they…

复变函数 · 数学 2026-04-20 Evgeny Sevost'yanov , Valery Targonskii , Denys Romash , Nataliya Ilkevych

This paper focuses on properties of \partial-biLipschitz mappings which were recently introduced by Bulter. We establish several characterizations for the class of \partial-biLipschitz mappings between domains in quasiconvex metric spaces.…

复变函数 · 数学 2022-02-16 Tiantian Guan , Saminathan Ponnusamy , Qingshan Zhou

It is given a canonical representation of prime ends in regular spatial domains and, on this basis, it is studied the boundary behavior of the so-called lower Q-homeomorphisms that are the natural generalization of the quasiconformal…

复变函数 · 数学 2015-02-13 Denis Kovtonyuk , Vladimir Ryazanov

For regular homeomorphisms of Sobolev class $W^{1,1}_{\textrm{loc}}$ having the Luzin $N$-property, it is established the estimation of the area of a disk image in terms of an angular dilatation. As a corollary, the analog of the well-known…

复变函数 · 数学 2016-04-27 V. Bilet , R. Salimov

This paper considers generalizations of open mappings, closed mappings, pseudo-open mappings, and quotient mappings from topological spaces to generalized topological spaces. Characterizations of these classes of mappings are obtained and…

一般拓扑 · 数学 2021-03-09 Xun Ge , Jianhua Gong , Ivan Reilly

In a neighborhood of isolated point of a domain of a metric space, a behavior of generalized quasiconformal mappings is studied. It is proved that, mappings mentioned above have continuous extension to the domain at some additional…

复变函数 · 数学 2017-08-04 E. A. Sevost'yanov , A. A. Markysh

The present paper is devoted to the study of mappings with finite distortion on Riemannian manifolds. Theorems on local behavior of generalized quasiisometries with unbounded characteristic of quasiconformality are obtained.

复变函数 · 数学 2015-12-22 E. A. Sevost'yanov , S. A. Skvortsov

We study generalized quasiconformal mappings in the context of the inverse Poletsky inequality. We consider the local behavior and the boundary behavior of mappings with the inverse Poletsky inequality. In particular, we obtain logarithmic…

复变函数 · 数学 2023-06-06 Vladimir Gol'dshtein , Evgeny Sevost'yanov , Alexander Ukhlov

We define $\partial$-biLipschitz homeomorphisms between uniform metric spaces and show that these maps are always quasim\"obius. We also show that a homeomorphism being $\partial$-biLipschitz is equivalent to the map biLipschitz in the…

度量几何 · 数学 2021-01-06 Clark Butler

In this article, we introduce and investigate the concept of partial quasi-metric type space as a generalization of both partial quasi-metric and quasi-metric type spaces. We show that many important constructions studied in K\"unzi's…

一般拓扑 · 数学 2019-03-18 Yaé Ulrich Gaba

A concept of quasi-metrizability with respect to a bornology of a generalized topological space in the sense of Delfs and Knebusch is introduced. Quasi-metrization theorems for generalized bornological universes are deduced. A uniform…

一般拓扑 · 数学 2018-10-19 Artur Piękosz , Eliza Wajch

We study mappings that satisfy the inverse modulus inequality of Poletsky type with respect to $p$-modulus. Given $n-1<p\leqslant n,$ we show that, the image of some ball contains a fixed ball under mappings mentioned above. This statement…

复变函数 · 数学 2026-03-31 Evgeny Sevost'yanov , Valery Targonskii , Nataliya Ilkevych

It is stated a series of criteria of equicontinuity and normality for classes of space mappings with integral restrictions. It is shown that the found conditions are not only sufficient but also necessary. It is given applications to…

复变函数 · 数学 2010-09-28 V. Ryazanov , E. Sevost'yanov

We present a new characterization of higher-order Sobolev spaces on the sphere. Building on the approach of Barcel\'o et al. (2020), we refine the square function they introduced for this purpose. In particular, we provide a detailed…

泛函分析 · 数学 2025-06-24 Ikhsan Maulidi , Hiroshi Ohtsuka

These notes provide an exposition on obtaining the well-known standard results of quasiregular maps on Riemannian manifolds, given the corresponding theory in the Euclidean setting. We recall several different approaches to first-order…

复变函数 · 数学 2021-09-06 Ilmari Kangasniemi

The article is devoted to the study of mappings that satisfy the so-called inverse Poletsky inequality. We consider mappings of quasiextremal distance domains, domains with a locally quasiconformal boundary, and domains which are regular in…

复变函数 · 数学 2023-10-03 M. V. Androschuk , O. P. Dovhopiatyi , N. S. Ilkevych , E. A. Sevost'yanov

Quasiregular maps are differentiable almost everywhere maps which are analogous to holomorphic maps in the plane for higher real dimensions. Introduced by Gutlyanskii et al, the infinitesimal space is a generalization of the notion of…

复变函数 · 数学 2020-01-27 Alastair Fletcher , Jacob Pratscher

We generalize the notions of $\beta$- and $\lambda$-maps to general selections of sublocales, obtaining different classes of localic maps. These new classes of maps are used to characterize almost normality, extremal disconnectedness,…

一般拓扑 · 数学 2024-07-25 Ana Belén Avilez

Let X be quasi-isometric to either the mapping class group equipped with the word metric, or to Teichmuller space equipped with either the Teichmuller metric or the Weil-Petersson metric. We introduce a unified approach to study the coarse…

几何拓扑 · 数学 2017-10-18 Alex Eskin , Howard Masur , Kasra Rafi

This article analyzes sublinearly quasisymmetric homeo-morphisms (generalized quasisymmetric mappings), and draws applications to the sublinear large-scale geometry of negatively curved groups and spaces. It is proven that those…

度量几何 · 数学 2020-03-02 Gabriel Pallier
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