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Related papers: Kobayashi-Royden pseudometric vs. Lempert function

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We show that if the Kobayashi--Royden metric of a complex manifold is continuous and positive at a given point and any non-zero tangent vector, then the "derivatives" of the higher order Lempert functions exist and equal the respective…

Complex Variables · Mathematics 2010-06-23 Nikolai Nikolov , Peter Pflug

Some results on the discontinuity properties of the Lempert function and the Kobayashi pseudometric in the spectral ball are given.

Complex Variables · Mathematics 2010-06-23 Nikolai Nikolov , Pascal J. Thomas , Wlodzimierz Zwonek

We show some lower estimates for the Kobayashi-Royden metric on a class of smooth bounded pseudoconvex domains.

Complex Variables · Mathematics 2009-10-15 Peter Pflug , Włodzimierz Zwonek

It is shown that a lower bound of the Kobayashi metric of convex domains in C^n does not hold for non-convex domains.

Complex Variables · Mathematics 2016-08-17 Nikolai Nikolov

In this paper, we construct a pseudoconvex domain in $\mathbb C^3$ where the Kobayashi metric does not blow up at a rate of one over distance to the boundary in the normal direction.

Complex Variables · Mathematics 2009-11-13 John Erik Fornaess , Lina Lee

Studying the behavior of real and complex geodesics we provide sharp estimates for the Kobayashi distance, the Lempert function, and the Carath\'eodory distance on $\mathcal{C}^{2,\alpha}$-smooth strongly pseudoconvex domains. Similar…

Complex Variables · Mathematics 2025-06-11 Łukasz Kosiński , Nikolai Nikolov , Ahmed Yekta Ökten

In the paper we show that the Lempert theorem (i.e. the equality between the Lempert function and the Carath\'eodory distance) holds in the tetrablock, a bounded hyperconvex domain which is not biholomorphic to a convex domain.

Complex Variables · Mathematics 2016-08-14 Armen Edigarian , Lukasz Kosinski , Włodzimierz Zwonek

We describe a family of smooth contractible algebraic surfaces $X$ different from $\C^2$ such that $X$ admits dominant holomorphic maps from $\C^2$ and there is a unique line $E$ in $X$ for which the Kobayashi-Royden pseudometric vanishes…

Complex Variables · Mathematics 2025-09-09 Shulim Kaliman

In this paper we introduce a new class of domains -- log-type convex domains, which have no boundary regularity assumptions. Then we will localize the Kobayashi metric in log-type convex subdomains. As an application, we prove a local…

Complex Variables · Mathematics 2020-04-17 Jinsong Liu , Hongyu Wang

We give a description (direct formulas) of all complex geodesics in a convex tube domain in $\CC^n$ containing no complex affine lines, expressed in terms of geometric properties of the domain. We next apply that result to give formulas (a…

Complex Variables · Mathematics 2014-10-06 Sylwester Zając

We show that Worm domains are not Gromov hyperbolic with respect to the Kobayashi distance.

Complex Variables · Mathematics 2023-06-16 Leandro Arosio , Gian Maria Dall'Ara , Matteo Fiacchi

It is known that the exponential transform of a quadrature domain is a rational function for which the denominator has a certain separable form. In the present paper we show that the exponential transform of lemniscate domains in general…

Complex Variables · Mathematics 2012-12-06 Björn Gustafssom , Vladimir G. Tkachev

We study the boundary behavior of the Kobayashi--Fuks metric on the class of h-extendible domains. Here, we derive the non-tangential boundary asymptotics of the Kobayashi--Fuks metric and its Riemannian volume element by the help of some…

Complex Variables · Mathematics 2024-03-21 Debaprasanna Kar

We extend the upper estimates obtained by M. Carlehed and B.-Y. Chen about the ratio of the classical and pluricomplex Green functions to the case of $\mathcal C^2$-smooth locally $\mathbb C$-convexifiable domains of finite type. We also…

Complex Variables · Mathematics 2018-09-17 Nikolai Nikolov , Pascal J. Thomas

The (unbounded version of the) Lempert function $l_D$ on a domain $D\subset\Bbb C^d$ does not usually satisfy the triangle inequality, but on bounded $\mathcal C^2$-smooth strictly pseudoconvex domains, it satisfies a quasi triangle…

Complex Variables · Mathematics 2026-02-16 Nikolai Nikolov , Pascal J. Thomas

We deliver examples of non-Gromov hyperbolic tube domains with convex bases (equipped with the Kobayashi distance). This is shown by providing a criterion on non-Gromov hyperbolicity of (non-smooth) domains.The results show the similarity…

Complex Variables · Mathematics 2016-10-20 Peter Pflug , Wlodzimierz Zwonek

We construct an unbounded strictly pseudoconvex Kobayashi hyperbolic and complete domain in $\mathbb{C}^2$, which also possesses complete Bergman metric, but has no nonconstant bounded holomorphic functions.

Complex Variables · Mathematics 2020-03-17 Nikolay Shcherbina , Liyou Zhang

We show that the Kobayashi pseudometric is well-behaved under resolution of log-terminal singularities. This answers a question of Kamenova and Lehn.

Algebraic Geometry · Mathematics 2025-08-29 Finn Bartsch

The Takagi function is a classical example of a continuous nowhere differentiable function. In this paper we prove that it is nowhere approximately derivable.

Classical Analysis and ODEs · Mathematics 2019-06-26 Juan Ferrera , Javier Gómez Gil

It is shown that the Carath\'eodory distance and the Lempert function are almost the same on any strongly pseudoconvex domain in $\C^n;$ in addition, if the boundary is $C^{2+\eps}$-smooth, then $\sqrt{n+1}$ times one of them almost…

Complex Variables · Mathematics 2014-12-01 Nikolai Nikolov
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