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The now canonical proof of Schwarz's Lemma appeared in a 1907 paper of Carath\'eodory, who attributed it to Erhard Schmidt. Since then, Schwarz's Lemma has acquired considerable fame, with multiple extensions and generalizations. Much less…

复变函数 · 数学 2007-05-23 Robert B. Burckel , Donald E. Marshall , Pietro Poggi-Corradini

The article introduces Ahlfors' generalization of the Schwarz lemma. With this powerful geometric tool of complex functions in one variable, we are able to prove some theorems concerning the size of images under holomorphic mappings,…

复变函数 · 数学 2015-06-24 Aleksander Simonič

The Schwarz--Pick lemma is a fundamental result in complex analysis. It is well-known that Yau generalized it to the higher dimensional manifolds by applying his maximum principle for complete Riemannian manifolds. Jeffres obtained Schwarz…

微分几何 · 数学 2016-10-07 Ryosuke Nomura

The Schwarz lemma as one of the most influential results in complex analysis and it has a great impact to the development of several research fields, such as geometric function theory, hyperbolic geometry, complex dynamical systems, and…

复变函数 · 数学 2017-04-25 Miodrag Mateljević

We prove several sharp distortion and monotonicity theorems for spherically convex functions defined on the unit disk involving geometric quantities such as spherical length, spherical area and total spherical curvature. These results can…

复变函数 · 数学 2022-04-05 Maria Kourou , Oliver Roth

It is well-known that the classical Schwarz lemma yields an explicit comparison of two Hermitian metrics with uniform constant negative curvature bounds through holomorphic maps between complex manifolds. In this paper, we establish Schwarz…

微分几何 · 数学 2024-12-05 Zhiyao Xiong , Xiaokui Yang , Shing-Tung Yau

Through the Schwarz lemma, we provide a new point of view on three well-known results of the geometry of hyperbolic surfaces. The first result deal with the length of closed geodesics on hyperbolic surfaces with boundary (Thurston, Parlier,…

微分几何 · 数学 2014-04-18 Matthieu Gendulphe

The most classical version of the Schwarz lemma involves the behavior at the origin of a bounded, holomorphic function on the disc. Pick's version of the Schwarz lemma allows one to move the origin to other points of the disc. In the…

复变函数 · 数学 2010-01-13 Steven G. Krantz

We prove a sharp Schwarz-type lemma for meromorphic functions with spherical derivative uniformly bounded away from zero. As a consequence we deduce an improved quantitative version of a recent normality criterion due to Grahl & Nevo and…

复变函数 · 数学 2020-03-04 Richard Fournier , Daniela Kraus , Oliver Roth

We prove two results related to the Schwarz lemma in complex geometry. First, we show that if the inequality in the Schwarz lemmata of Yau, Royden and Tosatti becomes equality at one point, then the equality holds on the whole manifold. In…

微分几何 · 数学 2022-02-15 Haojie Chen , Xiaolan Nie

This is an account of some aspects of the geometry of K\"ahler affine metrics based on considering them as smooth metric measure spaces and applying the comparison geometry of Bakry-Emery Ricci tensors. Such techniques yield a version for…

微分几何 · 数学 2017-05-03 Daniel J. F. Fox

We prove a Schwarz-type lemma for noncompact manifolds with possibly noncompact boundary. The result is a consequence of a suitable form of the weak maximum principle of independent interest. The paper is enriched with applications to…

微分几何 · 数学 2016-02-11 Guglielmo Albanese , Marco Rigoli

We present English translation of the classical article of Hermann Amadeus Schwarz (1843--1921) "Proof of the theorem that a surface area of a ball is smaller than of any other body of the same volume" which was published in 1884, in…

历史与综述 · 数学 2015-12-03 Simon Ulka , Leonid G. Fel , Boris Y. Rubinstein

In 1991, Beardon and Stephenson [2] generalized the classical Schwarz-Pick lemma in hyperbolic geometry to the discrete Schwarz-Pick lemma for Andreev circle packings. This paper continues to investigate the discrete Schwarz-Pick lemma for…

微分几何 · 数学 2024-11-12 Guangming Hu , Ziping Lei , Yanlin Li , Hao Yu

In this paper we prove a Schwarz-Pick lemma for the modulus of holomorphic mappings between the unit balls in complex spaces. This extends the classical Schwarz-Pick lemma and the related result proved by Pavlovic.

复变函数 · 数学 2013-07-31 Shaoyu Dai , Yifei Pan

A useful property of Euclidean space originally shown by I. Benjamini and O. Schramm turns out to characterize doubling metric spaces.

经典分析与常微分方程 · 数学 2012-11-02 James T. Gill

We describe all complex geodesics in the tetrablock passing through the origin thus obtaining the form of all extremals in the Schwarz Lemma for the tetrablock. Some other extremals for the Lempert function and geodesics are also given. The…

复变函数 · 数学 2014-02-26 A. Edigarian , W. Zwonek

In this paper, we prove a general Schwarz lemma at the boundary for holomorphic mappings from the polydisc to the unit ball in any dimensions. For the special case of one complex variable, the obtained results give the classic boundary…

复变函数 · 数学 2014-11-04 Yang Liu , Zhihua Chen , Yifei Pan

We consider the Banach space consisting of real-valued continuous functions on an arbitrary compact metric space. It is known that for a prevalent (in the sense of Hunt, Sauer and Yorke) set of functions the Hausdorff dimension of the image…

度量几何 · 数学 2014-10-06 Jonathan M. Fraser , James T. Hyde

We prove a version of the Schwarz lemma for holomorphic mappings from the unit disk into the symmetric product of a Riemann surface. Our proof is function-theoretic and self-contained. The main novelty in our proof is the use of the…

复变函数 · 数学 2019-09-10 Jaikrishnan Janardhanan
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