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Ohne ZusammenfassungWilhelm Klingenberg zum 60. Geburtstag gewidmet  相似文献   

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The Neumann and Dirichlet boundary value problem of generalized potential theory is considered. Based on a compact imbedding result, existence and uniqueness theorems are obtained for Riemannian manifolds with compact boundary (‘interior and exterior domains’).  相似文献   

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Let be a group of *-automorphisms on the algebra of bounded linear operators on a complex Hilbert space H. Then the strongly closed convex hull of the orbit of any compact operator under consists of compact operators. The same is true if one replaces compact by nuclear, Hilbert-Schmidt or positive Fredholm. We further discuss these results in the framework of the noncommutative mean ergodic theorem of KOVACS and SZ#x00FC;CS and formulate an analogous theorem for the algebra of compact operators on a complex Hilbert space.

Gefördert von der Deutschen Forschungsgemeinschaft im Rahmen des Forschungsvorhabens Ko 506/1.  相似文献   

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Ohne ZusammenfassungOn leave from Department of Physics, Michigan State University, East Lansing, Mich. USA.  相似文献   

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Ohne ZusammenfassungDer wesentliche Inhalt dieser Arbeit befindet sich bereits in der Dissertation des Verfassers (Wien 1950), der sich an dieser Stelle bei Herrn Professor Hlawka für die Anregung zu obigem Dissertationsthema bedanken möchte. Der Verfasser wurde durch einen Brief von Professor L. Koschmieder zur vereinfachten Niederschrift dieser Arbeit veranlaßt.  相似文献   

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Summary Let E be the collection of all experiments (in the sense of LeCam) with the same index set. Using the notion of -informativity a binary relation is introduced in E, which turns out to be equivalent with various other relations of comparison studied previously. For a certain subclass of E a characterization of -informativity via randomisation kernels yields the equivalence to Blackwell's sufficiency and in the case of contraction experiments also to sufficiency in the sense of Halmos and Savage. Furthermore the concept of translation invariance is generalized to large subclasses of E. In the case of invariance the characterizing kernels can also be chosen invariant. Applications of the theory to allocation and testing problems as well as to Shannon- and Fisher-informativity illuminate the general set up. The special case of experiments with only a finite index set appears strongly related to the study of orderings in the set of all positive Radon measures on compact convex subsets of certain topological vector spaces.

Die vorliegende Arbeit wurde von der Naturwissenschaftlichen Fakultät der Friedrich-Alexander-Universität Erlangen-Nürnberg im SS 1968 als Habilitationsschrift angenommen.  相似文献   

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