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We obtain uniqueness theorems for harmonic and subharmonic functions of a new type. They lead to new analytic extension criteria and new conditions for stability of operator semigroups in Banach spaces with Fourier type.

复变函数 · 数学 2007-05-23 A. Borichev , R. Chill , Yu. Tomilov

We prove several Liouville theorems for F-harmonic maps from some complete Riemannian manifolds by assuming some conditions on the Hessian of the distance function, the degrees of F(t) and the asymptotic behavior of the map at infinity. In…

微分几何 · 数学 2011-11-09 Yuxin Dong , Hezi Lin , Guilin Yang

In earlier work the authors have extended Nehari's well-known Schwarzian derivative criterion for univalence of analytic functions to a univalence criterion for canonical lifts of harmonic mappings to minimal surfaces. The present paper…

复变函数 · 数学 2010-05-31 Martin Chuaqui , Peter Duren , Brad Osgood

Pluriharmonic maps form an important class of harmonic maps which includes holomorphic maps. We study their morphisms, in particular the inter-relationships between $(1,1)$-geodesic, pluriharmonic and $\pm$holomorphic maps. Then we…

dg-ga · 数学 2008-02-03 Eric Loubeau

In this paper, we consider transversally harmonic maps between Riemannian manifolds with Riemannian foliations. In terms of the Bochner techniques and sub-Laplacian comparison theorem, we are able to establish a generalization of the…

微分几何 · 数学 2022-05-25 Xin Huang , Weike Yu

In this paper, we show that harmonic Bloch mappings are Lipschitz continuous with respect to the pseudo-hyperbolic metric. This result improves the corresponding result of Theorem 1 of [P. Ghatage, J. Yan, and D. Zheng, Composition…

复变函数 · 数学 2021-04-14 Jie Huang , Antti Rasila , Jian-Feng Zhu

The classical Fatou theorem identifies bounded harmonic functions on the unit disk with bounded measurable functions on the boundary circle. We extend this theorem to bounded harmonic maps.

微分几何 · 数学 2023-08-29 Yves Benoist , Dominique Hulin

In this note we obtain new coincidence theorems for absolutely summing multilinear mappings between Banach spaces. We also prove that our results, in general, can not be improved.

泛函分析 · 数学 2007-05-23 Daniel M. Pellegrino

We obtain new uniqueness theorems for harmonic functions defined on the unit disc or in the half plane. These results are applied to obtain new resolvent descriptions of spectral subspaces of polynomially bounded groups of operators on…

复变函数 · 数学 2010-03-16 Alexander Borichev , Yuri Tomilov

We prove exponential estimates for plurisubharmonic functions with respect to Monge-Ampere measures with Holder continuous potential. As an application, we obtain several stochastic properties for the equilibrium measures associated to…

复变函数 · 数学 2008-03-04 Tien-Cuong Dinh , Viet-Anh Nguyen , Nessim Sibony

In this paper, we will give Schwarz-Pick type estimates of arbitrary order partial derivatives for bounded pluriharmonic mappings defined in the unit polydisk. Our main results are generalizations of results of Colonna for planar harmonic…

复变函数 · 数学 2014-09-30 Shaolin Chen , Antti Rasila

The aim of this paper is to present two tools, Theorems 4 and 7, that make the task of finding equivalent polyhedral norms on certain Banach spaces easier and more transparent. The hypotheses of both tools are based on countable…

泛函分析 · 数学 2016-11-04 V. P. Fonf , A. J. Pallares , R. J. Smith , S. Troyanski

With the uniform positions we prove theorems of Landau and Hardy-Littlwood type for Goldbach, Chen, Lemoine-Levy and other binary partitions of positive integers. We also pose some new conjectures.

数论 · 数学 2012-03-27 Vladimir Shevelev

For a given continuous function $g:~\Omega\rightarrow\mathbb{C}$, we establish some Schwarz type Lemmas for mappings $f$ in $\Omega$ satisfying the {\rm PDE}: $\Delta f=g$, where $\Omega$ is a subset of the complex plane $\mathbb{C}$. Then…

复变函数 · 数学 2017-08-23 Shaolin Chen , David Kalaj

We construct sense-preserving univalent harmonic mappings which map the unit disk onto a domain which is convex in the horizontal direction, but with varying dilatation. Also, we obtain minimal surfaces associated with such harmonic…

复变函数 · 数学 2015-08-04 YuePing Jiang , ZhiHong Liu , Saminathan Ponnusamy

We prove a Liouville-type theorem for biharmonic maps from a complete Riemannian manifold of dimension \(n\) that has a lower bound on its Ricci curvature and positive injectivity radius into a Riemannian manifold whose sectional curvature…

微分几何 · 数学 2018-08-03 Volker Branding

In this paper, we establish some new variants of fixed point theorems for a large class of countably nonexpansive multi-valued mappings. Some fixed point theorems for the sum and the product of three multi-valued mappings defined on…

泛函分析 · 数学 2024-01-19 Khaled Ben Amara , Aref Jeribi , Najib Kaddachi

In this work we construct a variety of new complex-valued proper biharmonic maps and (2,1)-harmonic morphisms on Riemannian manifolds with non-trivial geometry. These are solutions to a non-linear system of partial differential equations…

微分几何 · 数学 2023-03-14 Elsa Ghandour , Sigmundur Gudmundsson

This paper extends the nonabelian Hodge correspondence for Kaehler manifolds to a larger class of hermitian metrics on complex manifolds called balanced of Hodge-Riemann type. Essentially, it grows out of a few key observations so that the…

微分几何 · 数学 2021-06-18 Xuemiao Chen , Richard A. Wentworth

We give a survey of Darboux type theorems in multisymplectic geometry. These theorems establish when a closed differential form of a certain type admits a constant-coefficient expression in some local coordinate system. Beyond the classical…

辛几何 · 数学 2025-06-26 Leonid Ryvkin