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Dr. A. Prestel 《Mathematische Zeitschrift》1973,133(4):319-342
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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Rainer Schulze-Pillot 《Journal of Number Theory》1982,14(2):237-250
We study the representation behaviour of a -lattice L on a positive definite ternary quadratic space V over . 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 p-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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Lothar Afflerbach 《Monatshefte für Mathematik》1982,94(1):1-8
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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