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In this paper we study quasi-symmetric conjugations of $C^2$ weakly order-preserving circle maps with a flat interval. Under the assumption that the maps have the same rotation number of bounded type and that bounded geometry holds we…

Dynamical Systems · Mathematics 2019-02-20 Liviana Palmisano

In this paper we provide a unified treatment of some convex minimization problems, which allows for a better understanding and, in some cases, improvement of results in this direction proved recently in spaces of curvature bounded above.…

Functional Analysis · Mathematics 2014-11-26 David Ariza-Ruiz , Genaro López-Acedo , Adriana Nicolae

In this paper we consider maps on the plane which are similar to quadratic maps in that they are degree 2 branched covers of the plane. In fact, consider for $\alpha$ fixed, maps $f_c$ which have the following form (in polar coordinates):…

Dynamical Systems · Mathematics 2011-07-26 Ben Bielefeld , Scott Sutherland , Folkert Tangerman , J. J. P. Veerman

We study metric spaces defined via a conformal weight, or more generally a measurable Finsler structure, on a domain $\Omega \subset \mathbb{R}^2$ that vanishes on a compact set $E \subset \Omega$ and satisfies mild assumptions. Our main…

Metric Geometry · Mathematics 2020-06-08 Toni Ikonen , Matthew Romney

We study numerical conformal mappings of planar Jordan domains with boundaries consisting of finitely many circular arcs and compute the moduli of quadrilaterals for these domains. Experimental error estimates are provided and, when…

Complex Variables · Mathematics 2023-03-16 Mohamed Nasser , Oona Rainio , Antti Rasila , Matti Vuorinen , Terry Wallace , Hang Yu , Xiaohui Zhang

This note examines sufficient conditions for the quasiconformal extendibility of harmonic mappings defined in the unit disk. It is demonstrated that a harmonic strongly starlike mapping admits a quasiconformal extension to the entire plane,…

Complex Variables · Mathematics 2025-09-03 Xiu-Shuang Ma

We prove a monotone Sobolev extension theorem for maps to Jordan domains with rectifiable boundary in metric surfaces of locally finite Hausdorff 2-measure. This is then used to prove a uniformization result for compact metric surfaces by…

Metric Geometry · Mathematics 2026-01-16 Damaris Meier , Noa Vikman , Stefan Wenger

Let $U$ be a multiply connected domain of the Riemann sphere $\hat{C}$ whose complement $\hat{C}\setminus U$ has $N<\infty$ components. We show that every conformal map on $U$ can be written as a composition of $N$ maps conformal on simply…

Complex Variables · Mathematics 2011-07-05 Benjamin Doyon

We study conformal mappings from the unit disk (or a rectangle) to one-tooth gear-shaped planar domains from the point of view of the Schwarzian derivative, with emphasis on numerical considerations. Applications are given to evaluation of…

Complex Variables · Mathematics 2024-10-15 Philip R. Brown , R. Michael Porter

We show that, under certain natural assumptions, large random plane bipartite maps with a boundary converge after rescaling to a one-parameter family ($\mathrm{BD}_L$, $0 < L < \infty$) of random metric spaces homeomorphic to the closed…

Probability · Mathematics 2016-02-12 Jérémie Bettinelli , Gregory Miermont

We prove that a proper holomorphic map between two bounded symmetric domains of the same dimension, one of them being irreducible, is a biholomorphism. Our methods allow us to give a single, all-encompassing argument that unifies the…

Complex Variables · Mathematics 2015-01-12 Gautam Bharali , Jaikrishnan Janardhanan

The purpose of this paper is to initiate a theory concerning the dynamics of asymptotically holomorphic polynomial-like maps. Our maps arise naturally as deep renormalizations of asymptotically holomorphic extensions of $C^r$ ($r>3$)…

Dynamical Systems · Mathematics 2018-04-18 Trevor Clark , Edson de Faria , Sebastian van Strien

We show how to express a conformal map of a general two connected domain in the plane such that neither boundary component is a point to a representative domain which has the virtue of having an explicit algebraic Bergman kernel function.…

Complex Variables · Mathematics 2008-01-16 Steven R. Bell , Ersin Deger , Thomas Tegtmeyer

We establish a connection between two previously unrelated topics: a particular discrete version of conformal geometry for triangulated surfaces, and the geometry of ideal polyhedra in hyperbolic three-space. Two triangulated surfaces are…

Geometric Topology · Mathematics 2015-09-02 Alexander Bobenko , Ulrich Pinkall , Boris Springborn

We prove the following result. If $f$ is a harmonic quasiconformal mapping between two Jordan domains $D$ and $\Omega$ having $\mathscr{C}^1$ boundaries, then the function $f$ is globally H\"older continuous for every $\alpha<1$ but it is…

Complex Variables · Mathematics 2023-11-21 David Kalaj

In the article we study the simple unital communitative three-dimensional algebras over an algebraically closed field of characteristic not equal to 2. It is proved that every simple unital communitative three-dimensional algebra of…

Rings and Algebras · Mathematics 2025-04-02 Vita Glizburg , Sergey Pchelintsev

Let $G$ and $H$ be locally compact groups. We will show that each contractive Jordan isomorphism $\Phi\colon L^1(G)\to L^1(H)$ is either an isometric isomorphism or an isometric anti-isomorphism. We will apply this result to study isometric…

Functional Analysis · Mathematics 2024-07-02 J. Alaminos , J. Extremera , C. Godoy , A. R. Villena

We study the uniform approximation of the canonical conformal mapping, for a Jordan domain onto the unit disk, by polynomials generated from the partial sums of the Szeg\H{o} kernel expansion. These polynomials converge to the conformal…

Complex Variables · Mathematics 2013-07-23 Igor E. Pritsker

We look for minimal conditions on a two-dimensional metric surface $X$ of locally finite Hausdorff $2$-measure under which $X$ admits an (almost) parametrization with good geometric and analytic properties. Only assuming that $X$ is locally…

Metric Geometry · Mathematics 2021-06-16 Damaris Meier , Stefan Wenger

We define symmetric spaces in arbitrary dimension and over arbitrary non-discrete topological fields $\K$, and we construct manifolds and symmetric spaces associated to topological continuous quasi-inverse Jordan pairs and -triple systems.…

Group Theory · Mathematics 2007-05-23 Wolfgang Bertram , Karl-Hermann Neeb