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Hans Robert Müller 《Monatshefte für Mathematik》1961,65(3):252-258
Ohne ZusammenfassungE. Kruppa zum 75. Geburtstag gewidmet 相似文献
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Michael Montag 《manuscripta mathematica》1982,39(2-3):245-252
In this paper we study rectlinear congruence surfaces of rectlinear normal congruences in the three dimensional elliptic space. First we characterize normal congruences by their principal parameters of distribution d1 and d2 and establish relations between d1, d2 and the principal curvatures k1 and k2 of the middle surfaces along the asymptotic lines and the lines of curvature of the middle surfaces. Finally we show that the congruence surfaces with a constant parameter of distribution cross the middle surfaces along curves whose strips are certain CESARO-strips. 相似文献
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Oskar Herrmann 《Mathematische Annalen》1967,168(1):105-110
Ohne ZusammenfassungHerrn Prof. Dr.C. L. Siegel zum 70. Geburtstag gewidmet 相似文献
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Helmut Pottmann 《Monatshefte für Mathematik》1985,99(4):315-320
In accordance withH. R. Müller [3] we understand under a curve of constant slope in the elliptic 3-space an isogonal trajectory of the generators of an arbitrary Clifford cylinder. Using linegeometric methods in a special projective model, we study in particular those curves of constant slope, whose tangents form also a constant angle with a fixed plane. Thereby we meet with well-known classes of curves in the Euclidean space, such as spherical involutoids and tractrices of circles and loxodromes on a torus. 相似文献
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Werner Georg Nowak 《manuscripta mathematica》1980,33(1):63-80
As a generalization of the sphere problem (cf. VINOGRADOV [7]) the present paper deals with estimates for the number of lattice points (points of the space with integral coordinates) in regions defined by xa+ya+za≦Ra, x≧0, y≧0, z≧0. In particuliar, the case 02 has been treated by KRÄTZEL [2]), and it appears that the exact asymptotic behaviour of the remainder term can be determined. Furthermore an asymptotic expansion of the remainder term is established containing the more valid terms the smaller the exponent a is. 相似文献
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Hubert Frank 《Archiv der Mathematik》1977,28(1):440-448
Ohne ZusammenfassungHerrn Professor Dr. H. R.Müller zum 65. Geburtstag gewidmet 相似文献
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