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In this paper, we obtain upper estimates for the distortion of the modulus of families of paths under mappings of the Sobolev class, whose dilatation is locally integrable. As a consequence, theorems on the local and boundary behavior of…

Complex Variables · Mathematics 2019-04-18 E. Sevost'yanov

This article is devoted to the study of mappings defined in the region on the plane. Under certain conditions, the upper estimate of the distortion of the modulus of families of paths is obtained. Similarly, the upper estimate of the…

Complex Variables · Mathematics 2022-07-22 E. Sevost'yanov , V. Targonskii

The article is devoted to the study of mappings that distort the modulus of families of paths according to the Poletsky inequality type. At the boundary points of the domain, we have obtained an estimate of the distance distortion for such…

Complex Variables · Mathematics 2023-05-19 O. P. Dovhopiatyi , E. A. Sevost'yanov

The article is devoted to establishing the distortion of the modulus of families of paths in wide classes of mappings that admit branch points. In particular, for mappings that are differentiable almost everywhere and have $N$- and $N^{\,-…

Complex Variables · Mathematics 2022-06-22 Evgeny Sevost'yanov , Valery Targonskii

We have studied the local and boundary behavior of mappings satisfying one estimate of the distortion of the modulus of families of paths. In particular, we have obtained conditions under which the families of the indicated mappings are…

Classical Analysis and ODEs · Mathematics 2019-04-03 E. A. Sevost'yanov , S. O. Skvortsov , O. P. Dovhopiatyi

The article is devoted to the study of mappings that distort the modulus of families of paths by the Poletsky inequality type. At boundary points of a domain, we have obtained the H\"{o}lder inequality for such mappings, provided that their…

Complex Variables · Mathematics 2023-05-19 Evgeny Sevost'yanov

We study mappings defined in the domain of a metric space that distort the modulus of families of paths by the type of the inverse Poletskii inequality. Under certain conditions, it is proved that such mappings have a continuous extension…

Complex Variables · Mathematics 2021-07-19 Evgeny Sevost'yanov

The paper is devoted to the study of mappings with finite distortion, actively studied recently. For mappings whose inverse satisfy the Poletsky inequality, the results on boundary behavior in terms of prime ends are obtained. In…

Complex Variables · Mathematics 2019-01-15 E. A. Sevost'yanov , S. A. Skvortsov , N. S. Ilkevych

We have studied the mappings that satisfy the Poletsky-type inverse inequality in the domain of the Euclidean space. It is proved that the uniform boundary of the family of such mappings is a discrete mapping. We separately considered…

Complex Variables · Mathematics 2024-04-29 E. O. Sevost'yanov , V. A. Targonskii

This paper is devoted to the study of mappings with finite distortion, in particular, mappings satisfying the inverse Poletskii inequality. We study the problem of equicontinuity of families of such mappings in a given domain. We establish…

Complex Variables · Mathematics 2026-05-21 Miodrag Mateljevic , Evgeny Sevost'yanov

We study some problems related to the boundary behavior of maps of domains of Riemannian surfaces. In particular, for mappings satisfying the inverse Poletsky type modulus inequality, we establish the possibility of their continuous…

Complex Variables · Mathematics 2023-03-06 E. A. Sevost'yanov

The paper is devoted to the study of the boundary behavior of mappings. We consider mappings that satisfy inverse moduli inequalities of Poletskii type, under which the images of the domain under the mappings may change. It is proved that a…

Complex Variables · Mathematics 2026-05-21 Zarina Kovba , Evgeny Sevost'yanov

The present paper is devoted to the study of space mappings, which are more general than quasiregular. The so--called modulus inequalities for some class of mappings are obtained. In particular, the analogues of the well--known Poletskii…

Complex Variables · Mathematics 2012-08-21 Ruslan Salimov , Evgeny Sevost'yanov

The manuscript is devoted to the boundary behavior of mappings with bounded and finite distortion. We consider mappings of domains of the Euclidean space that satisfy weighted Poletsky inequality. Assume that, the definition domain is…

Complex Variables · Mathematics 2024-04-08 Victoria Desyatka , Evgeny Sevost'yanov

We have studied homeomorphisms that satisfy the Poletsky-type inverse inequality in the domain of the Euclidean space. It is proved that the uniform limit of the family of such homeomorphisms is either a homeomorphism into the Euclidean…

Complex Variables · Mathematics 2024-06-06 Evgeny Sevost'yanov , Valery Targonskii

We study open-closed discrete mappings that satisfy the weighted estimate of the distortion of modulus of families of paths. It is proved that the mappings mentioned above have a continuous extension into the isolated point of the boundary,…

Complex Variables · Mathematics 2020-04-30 Evgeny Sevost'yanov

We consider mappings that distort the modulus of families of paths in the opposite direction in the manner of Poletsky's inequality. Here we study the case when the mappings are not closed, in particular, they do not preserve the boundary…

Complex Variables · Mathematics 2024-09-06 Evgeny Sevost'yanov , Victoria Desyatka Zarina Kovba

This manuscript is devoted to the study of mappings, satisfying the upper weighted Poletsky inequality. We study the case where the boundary of the domain may not be preserved under the mapping and, besides that, the majorant from the above…

Complex Variables · Mathematics 2026-03-03 Victoria Desyatka , Oleksandr Dovhopiatyi , Evgeny Sevost'yanov

In the article we study mappings of Carnot groups satisfy moduli inequalities. We prove that homeomorphisms satisfy the moduli inequalities ($Q$-homeomor\-phisms) with a locally integrable function $Q$ are Sobolev mappings. On this base in…

Analysis of PDEs · Mathematics 2020-04-20 Evgenii Sevost'yanov , Alexander Ukhlov

We prove that open discrete mappings of Sobolev classes $W_{\rm loc}^{1, p},$ $p>n-1,$ with locally integrable inner dilatations admit $ACP_p^{\,-1}$-property, which means that these mappings are absolutely continuous on almost all preimage…

Complex Variables · Mathematics 2015-04-22 Anatoly Golberg , Evgeny Sevost'yanov
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