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Nonpositive Curvature: Geometric and Analytic Aspects
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Catalogue Information
Field name
Details
Dewey Class
516.36
Title
Nonpositive Curvature: Geometric and Analytic Aspects ([EBook]) / by Jürgen Jost.
Author
Jost, Jürgen , 1956-
Other name(s)
SpringerLink (Online service)
Publication
Basel : Birkhäuser , 1997.
Physical Details
VIII, 112 pages, 3 illus. : online resource.
Series
Lectures in Mathematics ETH Zürich, Department of Mathematics Research Institute of Mathematics
ISBN
9783034889186
Summary Note
The present book contains the lecture notes from a "Nachdiplomvorlesung", a topics course adressed to Ph. D. students, at the ETH ZUrich during the winter term 95/96. Consequently, these notes are arranged according to the requirements of organizing the material for oral exposition, and the level of difficulty and the exposition were adjusted to the audience in Zurich. The aim of the course was to introduce some geometric and analytic concepts that have been found useful in advancing our understanding of spaces of nonpos itive curvature. In particular in recent years, it has been realized that often it is useful for a systematic understanding not to restrict the attention to Riemannian manifolds only, but to consider more general classes of metric spaces of generalized nonpositive curvature. The basic idea is to isolate a property that on one hand can be formulated solely in terms of the distance function and on the other hand is characteristic of nonpositive sectional curvature on a Riemannian manifold, and then to take this property as an axiom for defining a metric space of nonposi tive curvature. Such constructions have been put forward by Wald, Alexandrov, Busemann, and others, and they will be systematically explored in Chapter 2. Our focus and treatment will often be different from the existing literature. In the first Chapter, we consider several classes of examples of Riemannian manifolds of nonpositive curvature, and we explain how conditions about nonpos itivity or negativity of curvature can be exploited in various geometric contexts.:
Contents note
1 Introduction -- 1.1 Examples of Riemannian manifolds of negative or nonpositive sectional curvature -- 1.2 Mordell and Shafarevitch type problems -- 1.3 Geometric superrigidity -- 2 Spaces of nonpositive curvature -- 2.1 Local properties of Riemannian manifolds of nonpositive sectional curvature -- 2.2 Nonpositive curvature in the sense of Busemann -- 2.3 Nonpositive curvature in the sense of Alexandrov -- 3 Convex functions and centers of mass -- 3.1 Minimizers of convex functions -- 3.2 Centers of mass -- 3.3 Convex hulls -- 4 Generalized harmonic maps -- 4.1 The definition of generalized harmonic maps -- 4.2 Minimizers of generalized energy functional -- 5 Bochner-Matsushima type identities for harmonic maps and rigidity theorems -- 5.1 The Bochner formula for harmonic one-forms and harmonic maps -- 5.2 A Matsushima type formula for harmonic maps -- 5.3 Geometrie superrigidity.
System details note
Online access to this digital book is restricted to subscription institutions through IP address (only for SISSA internal users)
Internet Site
http://dx.doi.org/10.1007/978-3-0348-8918-6
Links to Related Works
Subject References:
Differential Geometry
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Mathematics
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Authors:
Jost, Jürgen 1956-
.
Jost, Jürgen, 1956-
.
Corporate Authors:
SpringerLink (Online service)
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Series:
Lectures in Mathematics ETH Zürich, Department of Mathematics Research Institute of Mathematics
.
Classification:
516.36
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