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We study the boundary behavior of the so-called ring $Q$-mappings obtained as a natural generalization of mappings with bounded distortion. We establish a series of conditions imposed on a function $Q(x)$ for the continuous extension of…

复变函数 · 数学 2018-01-03 E. Sevost'yanov

The local stability of the solution map to a parametric boundary control problem governed by semilinear elliptic equations with finite mixed pointwise constraints is considered in this paper. We prove that the solution map is locally…

最优化与控制 · 数学 2022-11-28 Nguyen Hai Son , Tuan Anh Dao

In this article we study fine regularity properties for mappings of finite distortion. Our main theorems yield strongly localized regularity results in the borderline case in the class of maps of exponentially integrable distortion.…

复变函数 · 数学 2021-09-28 Olli Hirviniemi , István Prause , Eero Saksman

In the present paper, mappings satisfying one modular inequality with respect to cylinders in a space, are considered. Distorting of modulus is majorized by an integral which depends from some locally integrable function. The result on…

复变函数 · 数学 2015-12-23 R. R. Salimov , E. A. Sevost'yanov

We consider mappings satisfying an upper bound for the distortion of families of curves. We establish lower bounds for the distortion of distances under such mappings. As applications, we obtain theorems on the discreteness of the limit…

复变函数 · 数学 2024-11-07 Evgeny Sevost'yanov , Denys Romash , Nataliya Ilkevych

This paper is devoted to the study of the boundary behavior of Orlicz-Sobolev classes that may not preserve the boundary under mapping. Under certain conditions, we show that these mappings have a continuous extension to the boundary of…

复变函数 · 数学 2026-02-10 Victoria Desyatka , Alina Halyts'ka , Evgeny Sevost'yanov

It is formulated conditions on functions $Q(x)$ and boundaries of domains under which every $Q$-homeomorphism admits continuous or homeomorphic extension to the boundary in metric spaces with measures.

复变函数 · 数学 2012-10-17 R. Salimov , O. Afanas'eva

We investigate linear parabolic, second-order boundary value problems with mixed boundary conditions on rough domains. Assuming only boundedness and ellipticity on the coefficient function and very mild conditions on the geometry of the…

偏微分方程分析 · 数学 2015-03-25 K. Disser , A. F. M. ter Elst , J. Rehberg

In terms of dilatations, it is proved a series of criteria for continuous and homeomorphic extension to the boundary of mappings with finite distortion between regular domains on the Riemann surfaces

复变函数 · 数学 2016-10-18 Vladimir Ryazanov , Sergei Volkov

It is established a continuous boundary extension of some class of mappings. Under some additional conditions, we have established that this extension is light in the closure of the definition domain. Under some stronger conditions, we also…

复变函数 · 数学 2022-11-08 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…

复变函数 · 数学 2024-04-08 Victoria Desyatka , Evgeny Sevost'yanov

In this paper, we prove a rigidity result for proper holomorphic maps between unit balls that have many symmetries and which extend to H\"older continuous maps on the boundary, with H\"older exponent strictly greater than 1/2.

We prove sharp boundary H{\"o}lder regularity for solutions to equations involving stable integro-differential operators in bounded open sets satisfying the exterior $C^{1,\text{dini}}$-property. This result is new even for the fractional…

偏微分方程分析 · 数学 2024-10-02 Florian Grube

The article is devoted to mappings with bounded and finite distortion of plane domains. Our investigations are devoted to the connection between mappings of the Sobolev class and upper bounds for the distortion of the modulus of families of…

复变函数 · 数学 2022-05-09 R. R. Salimov , E. A. Sevost'yanov , V. A. Targonskii

We study the boundary regularity of proper holomorphic mappings between strictly pseudoconvex domains with $C^2$-boundaries.

复变函数 · 数学 2021-04-27 Alexandre Sukhov

For mappings in metric spaces satisfying one inequality with respect to modulus of families of curves, there is proved a lightness of the uniform limit of these mappings. It is proved that, the uniform limit of these mappings is light…

度量几何 · 数学 2018-01-31 E. A. Sevost'yanov , S. A. Skvortsov

In this note, we characterize the sharp boundary condition such that the fractional harmonic extensions with H\"older regularity up to the boundary is globally H\"older continuous. The proofs are based on estimates of fractional harmonic…

偏微分方程分析 · 数学 2025-08-19 Feng Li

In the present paper, we investigate non-homeomorphic mappings of Riemannian surfaces of Sobolev class. We have obtained some estimates of distortion of moduli of families of curves. As consequence, we have obtained results about the…

复变函数 · 数学 2021-04-20 E. A. Sevost'yanov

We determine the rational class and Picard groups of the moduli space of stable logarithmic maps in genus zero, with target projective space relative a hyperplane. For the class group we exhibit an explicit basis consisting of boundary…

代数几何 · 数学 2024-04-16 Patrick Kennedy-Hunt , Navid Nabijou , Qaasim Shafi , Wanlong Zheng

We prove several formulas for the Hilbert metric in the unit disk and apply these results to study quasiregular mappings of the unit disk $\mathbb{B}^2$ onto a bounded convex domain $D$. The main result deals with the H\"older continuity of…

复变函数 · 数学 2025-12-01 Şahsene Altınkaya , Masayo Fujimura , Marcelina Mocanu , Matti Vuorinen