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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...

18 leichte Klaviertitel, die sich mit Edelsteinen, Heilsteinen und Mineralien auseinander setzen. Entstanden sind wohlklingende Stücke, welche die mystische Wirkung eines jeden Edelsteins erforschen und ihre jeweiligen Besonderheiten zum Klingen bringen.

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The present book represents to a large extent the translation of the German "Vorlesungen uber Himmelsmechanik" by C. L. Siegel. The demand for a new edition and for an English translation gave rise to the present volume which, however, goes beyond a mere translation. To take account of recent work in this field a number of sections have been added, especially in the third chapter which deals with the stability theory. Still, it has not been attempted to give a complete presentation of the subject, and the basic prganization of Siegel's original book has not been altered. The emphasis lies in...