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Ohne Zusammenfassung  相似文献   

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Ohne ZusammenfassungDie Ergebnisse über quadratische Semi-Ordnungen entstammen zum größten Teil der Habilitationsschrift des Autors an der Universität Bonn vom Februar 1972. Diese Arbeit wurde im Rahmen des Programms des SFB Bonn Theoretische Mathematik verfaßt.  相似文献   

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We study the representation behaviour of a Z-lattice L on a positive definite ternary quadratic space V over Q. As a new tool for this we use the Bruhat-Tits building of the spingroup of the completion of V at a suitable prime p. In Section 2 we show how this can be described in an elementary way as a graph whose vertices are the Zp-maximal lattices on Vp, and in Section 4 we let this graph induce a graph, whose vertices are lattices on V, which differ from L only at the prime p. In Section 3 we investigate which lattices from the graph defined in Section 2 have a given vector in common. The results are used in Sections 5 and 6 to obtain information on the representation behaviour of some special lattices. In Section 5 we get a list of lattices, which represent all numbers they represent locally everywhere; this list contains that given by Watson in [16]. In Section 6 we sharpen a result of Jones and Pall from [6].  相似文献   

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H. Minkowski stated that a positive definite quadratic form in 5 variables is reduced if a certain finite system of inequalities is fulfilled. This fact was first proved byS. S. Ryshkov in 1971. Here a new proof is given which is similar toMinkowski's treatment of forms in 4 variables. In place of the 4 different cases distinguished inRyshkov's proof only a distinction between 2 cases is necessary in the presented proof.  相似文献   

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Ohne ZusammenfassungHerrn Ernst Witt zum 60. Geburtstag am 26. 6. 1971  相似文献   

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