Positive Semigroups of Operators, and Applications

P. E. T. Jørgensen

ISBN 10: 9400964862 / ISBN 13: 9789400964860

Edité par Springer Netherlands, Springer Netherlands Okt 2011, 2011

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This item is printed on demand - Print on Demand Titel. Neuware -This means that semigroup theory may be applied directly to the study of the equation I'!.f = h on M. In [45] Yau proves that, for h ~ 0, there are no nonconstant, nonnegative solutions f in [j' for 1Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 208 pp. Englisch.

N° de réf. du vendeur 9789400964860

Détails bibliographiques

• Titre: Positive Semigroups of Operators, and Applications
• Éditeur: Springer Netherlands, Springer Netherlands Okt 2011
• Date de parution: 2011
• Langue: anglais
• ISBN à 10 chiffres: 9400964862
• ISBN à 13 chiffres: 9789400964860
• Reliure: Taschenbuch
• État de l'article: Neu

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Synopsis

This means that semigroup theory may be applied directly to the study of the equation I'!.f = h on M. In [45] Yau proves that, for h ~ 0, there are no nonconstant, nonnegative solutions f in [j' for 1 < p < 00. From this, Yau gets the geometric fact that complete noncom pact Riemannian manifolds with nonnegative Ricci curvature must have infinite volume, a result which was announced earlier by Calabi [4]. 6. Concluding Remarks In several of the above results, positivity of the semigroup plays an important role. This was also true, although only implicitly, for the early work of Hille and Yosida on the Fokker-Planck equation, i.e., Equation (4) with c = O. But it was Phillips [41], and Lumer and Phillips [37] who first called attention to the importance of dissipative and dispersive properties of the generator in the context of linear operators in a Banach space. The generation theorems in the Batty-Robinson paper appear to be the most definitive ones, so far, for this class of operators. The fundamental role played by the infinitesimal operator, also for the understanding of order properties, in the commutative as well as the noncommutative setting, are highlighted in a number of examples and applications in the different papers, and it is hoped that this publication will be of interest to researchers in a broad spectrum of the mathematical sub-divisions.