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Several conditions are shown to be equivalent to the aperiodicity of a regular probability measure on a locally compact, separated topological GroupG. In particular, is aperiodic if and only if the sequence ( ( (n) denoting then-th convolution power of ) is convergent for any nonvoid open subsetU ofG with compact closure. It is always assumed that the support of generatesG as a closed semigroup.  相似文献   

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Ohne Zusammenfassung Meinem Lehrer und Freund Willy Scherrer zum 60. Geburtstag gewidmet  相似文献   

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Dimension und äußeres Maß   总被引:1,自引:0,他引:1  
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This paper is one of the final steps in a classification program to determine all eight-dimensional, locally compact translation planes having large collineation groups. Here, we describe all such planes whose collineation group contains a semidirect product ·N, whereN is an at least 3-dimensional normal subgroup consisting of shears with fixed axis, and is isomorphic to SO3 ().  相似文献   

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We consider random orientated straight lines in the Euclidian plane.R. Ambartzumian has pointed out that general measures of straight lines are linked with certain pseudo-metrics. He has proved that any pseudometric satisfying certain conditions is generated by a measure of straight lines. In this paper, we investigate general measures of orientated straight lines and show that they are linked with functions whose properties are similar to those of pseudo-metrics. In general, the symmetry is not given. Starting from these non-symmetric pseudo-metrics it is possible to define some sort of length of a curve such that the theorem ofCrofton giving the number of common points of random straight lines and fixed curves remains valid for general measures.  相似文献   

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Ohne ZusammenfassungVon der Naturwissenschaftlichen Fakultät der Universität Erlangen als Habilitationsschrift angenommen.  相似文献   

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