共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Hans Robert Müller 《Journal of Geometry》1976,8(1-2):1-7
A generalisation of a ruled surface in n-dimensional euclidean space may be generated by euclidean motion of a s-plane As. For this one-parametric family {As} the curve of striction is defined and the following theorems are proved:
- The generators As are parallel along the curve of striction, i.e. the multivectors representing As form a parallel vector field along the curve of striction.
- If the curve of striction is geodesic on {As}, it is also an isogonal trajectory of the family of generators {As}.
6.
7.
Ohne Zusammenfassung 相似文献
8.
9.
10.
Ohne Zusammenfassung 相似文献
11.
12.
Hakki Ismail Erdoğan 《Journal of Geometry》2000,68(1-2):76-80
In this work, we consider four one-parameter families of spheres which do not belong to the same bundle with the additional condition that three of these families of spheres cut the spherez=0 belonging to the fourth family in a hexagonal three-web formed by the three families of curves defined by the equationsx
2 +y
2=u
1, x=u
2, y=u
3 x. Then, we determine these families of spheres in such a way that they form a hexagonal surface 4-web. 相似文献
13.
14.
Ohne ZusammenfassungMit einer Figur im Text 相似文献
15.
W. Jobst 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1963,14(2):186-189
Ohne Zusammenfassung 相似文献
16.
Oskar Perron 《Mathematische Zeitschrift》1955,63(1):19-30
Ohne Zusammenfassung
Issai schur zum Gedächtnis. 相似文献
17.
18.
19.
20.
Bruno Federer 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1963,14(5):518-522
Summary Four different zinc-selenides were produced by chemical precipitation and transport reactions. Their surface-properties have been investigated by electron diffraction, nitrogen-adsorption and ice-nucleability. The results support the hypothesis ofZettlemoyer
et al. [7] that cluster formation of water-molecules adsorbed on surface inhomogeneities is necessary for ice to be formed on a nucleating agent. 相似文献