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In this paper, we consider boundary extensions of two classes of mappings between metric measure spaces. These two mapping classes extend in particular the well-studied geometric mappings such as quasiregular mappings with integrable…

Complex Variables · Mathematics 2024-03-20 Yao-Lan Tian , Yi Xuan

In this paper we provide extensions of the $\lambda$-Lemma (also known as Inclination Lemma) for piecewise smooth vector fields and maps. In order to achieve our main result, we investigate the regularity of time-T-maps of piecewise smooth…

Dynamical Systems · Mathematics 2025-07-16 Claudio A. Buzzi , Paulo Santana , Luan V. M. F. Silva

We show that homeomorphisms $f$ in ${\Bbb R}^n$, $n\geqslant3$, of finite distortion in the Orlicz--Sobolev classes $W^{1,\varphi}_{\rm loc}$ with a condition on $\varphi$ of the Calderon type and, in particular, in the Sobolev classes…

Complex Variables · Mathematics 2014-08-05 Denis Kovtonyuk , Vladimir Ryazanov

We consider some class of homeomorphisms of domains of Euclidean space, which are more general than quasiconformal mappings. For these homeomorphisms, we have obtained theorems on local behavior of it's inverse mappings in a given domain.…

Metric Geometry · Mathematics 2018-05-10 E. A. Sevost'yanov , S. A. Skvortsov

We construct a global homotopy formula for $a_q$ domains in a complex manifold. The homotopy operators in the formula will gain $1/2$ derivative in H\"older-Zygmund spaces $\Lambda^{r}$ when the boundaries of the domains are in…

Complex Variables · Mathematics 2025-05-02 Xianghong Gong , Ziming Shi

In a Riemannian manifold a regular convex domain is said to be $\lambda$-convex if its normal curvature at each point is greater than or equal to $\lambda$. In a Hadamard manifold, the asymptotic behaviour of the quotient…

Differential Geometry · Mathematics 2013-03-21 J. Abardia , E. Gallego

Very recently, it was proved that if the hyperbolic metric of a planar Jordan domain is $L^q$-integrable for some $q\in (1,\infty)$, then every homeomorphic parametrization of the boundary Jordan curve via the unit circle can be extended to…

Complex Variables · Mathematics 2025-06-13 Xilin Zhou

We consider extensions of quasiconformal maps and the uniformization theorem to the setting of metric spaces $X$ homeomorphic to $\mathbb R^2$. Given a measure $\mu$ on such a space, we introduce $\mu$-quasiconformal maps $f:X \to \mathbb…

Complex Variables · Mathematics 2021-05-25 Kai Rajala , Martti Rasimus , Matthew Romney

We study the regularity results of holomorphic correspondences. As an application, we combine it with certain recently developed methods to obtain the extension theorem for proper holomorphic mappings between domains with real analytic…

Complex Variables · Mathematics 2016-09-06 Xiaojun Huang

We show that every cross ratio preserving homeomorphism between boundaries of Hadamard manifolds extends to a continuous map, called circumcenter extension, provided that the manifolds satisfy certain visibility conditions. We show that…

Metric Geometry · Mathematics 2022-01-06 Merlin Incerti-Medici

We investigate the boundary behavior of holomorphic functions with respect to a family of curves in a domain of finite type. This work is a generalization of \u{C}irka's classical result on the unit ball and it supplements the result by…

Complex Variables · Mathematics 2013-05-10 Steven G. Krantz , Baili Min

On a reasonable class of domains in $\CC^n$, we characterize those holomorphic functions which continue analytically past the boundary. Then we give some applications of this result to holomorphic mappings. In addition, some new results…

Complex Variables · Mathematics 2013-06-20 Steven G. Krantz

The $\lambda$-perfect maps, a generalization of perfect maps (continuous closed maps with compact fibers) are presented. Using $P_\lambda$-spaces and the concept of $\lambda$-compactness some results regarding $\lambda$-perfect maps will be…

General Topology · Mathematics 2016-10-25 M. Namdari , M. A. Siavoshi

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 study the boundary correspondence under $\mu$-homeomorphisms $f$ of the open upper half-plane onto itself. Sufficient conditions are given for $f$ to admit a homeomorphic extension to the closed half-plane with prescribed boundary…

Complex Variables · Mathematics 2011-02-25 Vladimir Gutlyanskii , Ken-ichi Sakan , Toshiyuki Sugawa

The behavior of a class of mappings of a domain of Euclidean space is studied. It is established that the indicated class is equicontinuous both at the inner and at the boundary points of the domain if the mappings contained in it satisfy…

Metric Geometry · Mathematics 2019-11-05 E. A. Sevost'yanov , S. O. Skvortsov

We prove that every infinite-dimensional (locally convex) linear topological space that can be expressed as a direct limit of finite-dimensional metrizable compacta is (linearly) homeomorphic to the space $R^\infty=\dlim R^n$.

General Topology · Mathematics 2013-05-10 Taras Banakh

In this work we provide alternative formulations of the concepts of lambda theory and extensional theory without introducing the notion of substitution and the sets of all, free and bound variables occurring in a term. We also clarify the…

Logic in Computer Science · Computer Science 2019-03-21 Michele Basaldella

For some class of mappings satisfying upper modular estimates with respect to families of curves, a behavior of the corresponding inverse mappings is investigated. In the terms of prime ends, it is proved that, families of such…

Metric Geometry · Mathematics 2016-05-31 R. R. Salimov , E. A. Sevost'yanov

Using the notion of modulus of continuity at a point of a mapping between metric spaces, we introduce the notion of extensively bounded mappings generalizing that of Lipschitz mappings. We also introduce a metric on it which becomes a norm…

Functional Analysis · Mathematics 2025-01-06 Anil Kumar Karn , Arindam Mandal