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Catalogue Information
Field name
Details
Dewey Class
515.64
Title
Selected Chapters in the Calculus of Variations ([EBook]) / by Jürgen Moser, Oliver Knill.
Author
Moser, Jürgen , 1928-1999
Added Personal Name
Knill, Oliver
Other name(s)
SpringerLink (Online service)
Publication
Basel : Birkhäuser , 2003.
Physical Details
VI, 134 p. 12 illus., 1 illus. in color. : online resource.
Series
Lectures in mathematics / ETH Zürich
ISBN
9783034880572
Summary Note
0.1 Introduction These lecture notes describe a new development in the calculus of variations which is called Aubry-Mather-Theory. The starting point for the theoretical physicist Aubry was a model for the descrip tion of the motion of electrons in a two-dimensional crystal. Aubry investigated a related discrete variational problem and the corresponding minimal solutions. On the other hand, Mather started with a specific class of area-preserving annulus mappings, the so-called monotone twist maps. These maps appear in mechanics as Poincare maps. Such maps were studied by Birkhoff during the 1920s in several papers. In 1982, Mather succeeded to make essential progress in this field and to prove the existence of a class of closed invariant subsets which are now called Mather sets. His existence theorem is based again on a variational principle. Although these two investigations have different motivations, they are closely re lated and have the same mathematical foundation. We will not follow those ap proaches but will make a connection to classical results of Jacobi, Legendre, Weier strass and others from the 19th century. Therefore in Chapter I, we will put together the results of the classical theory which are the most important for us. The notion of extremal fields will be most relevant. In Chapter II we will investigate variational problems on the 2-dimensional torus. We will look at the corresponding global minimals as well as at the relation be tween minimals and extremal fields. In this way, we will be led to Mather sets.:
Contents note
1 One-dimensional variational problems -- 1.1 Regularity of the minimals -- 1.2 Examples -- 1.3 The accessory variational problem -- 1.4 Extremal fields for n=1 -- 1.5 The Hamiltonian formulation -- 1.6 Exercises to Chapter 1 -- 2 Extremal fields and global minimals -- 2.1 Global extremal fields -- 2.2 An existence theorem -- 2.3 Properties of global minimals -- 2.4 A priori estimates and a compactness property -- 2.5 Ma for irrational a, Mather sets -- 2.6 Ma for rational a -- 2.7 Exercises to chapter II -- 3 Discrete Systems, Applications -- 3.1 Monotone twist maps -- 3.2 A discrete variational problem -- 3.3 Three examples -- 3.4 A second variational problem -- 3.5 Minimal geodesics on T2 -- 3.6 Hedlund’s metric on T3 -- 3.7 Exercises to chapter III -- A Remarks on the literature -- Additional Bibliography.
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/10.1007/978-3-0348-8057-2
Links to Related Works
Subject References:
Calculus of variations
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Calculus of variations and optimal control; optimization
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Differential Geometry
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Global differential geometry
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Mathematical optimization
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Authors:
author
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Knill, Oliver
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Moser, Jürgen 1928-1999
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Corporate Authors:
SpringerLink (Online service)
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Series:
Lectures in mathematics / ETH Zürich
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Classification:
515.64
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