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portada Selected Chapters in the Calculus of Variations: Lecture Notes by Oliver Knill (Lectures in Mathematics. Eth Zurich) (en Inglés)
Formato
Libro Físico
Editorial
Año
2003
Idioma
Inglés
N° páginas
134
Encuadernación
Tapa Blanda
ISBN
3764321857
ISBN13
9783764321857
N° edición
2003
Categorías

Selected Chapters in the Calculus of Variations: Lecture Notes by Oliver Knill (Lectures in Mathematics. Eth Zurich) (en Inglés)

Jürgen Moser (Autor) · Birkhäuser · Tapa Blanda

Selected Chapters in the Calculus of Variations: Lecture Notes by Oliver Knill (Lectures in Mathematics. Eth Zurich) (en Inglés) - Jürgen Moser

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Reseña del libro "Selected Chapters in the Calculus of Variations: Lecture Notes by Oliver Knill (Lectures in Mathematics. Eth Zurich) (en Inglés)"

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.

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