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arXiv 1701.00514math.DG
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关于三维欧几里得空间中ruled surfaces相对正规化的注记

Notes on relative normalizations of ruled surfaces in the three-dimensional Euclidean space

Stylianos Stamatakis, Ioanna-Iris Papadopoulou

摘要:

本文讨论了欧几里得空间$\mathbb{E}^{3}$中斜直纹曲面的相对正规化问题。第二节研究了相对正规化直纹曲面$\varPhi$的Pick不变量、相对曲率、相对中曲率和相对度量曲率的新公式,第三节介绍了相对正规化直纹曲面的一些特殊正规化,第四节确定了使$\varPhi$成为非正规或正规相对球面的直纹曲面及其相应的正规化。在最后一节中,我们研究直纹曲面,它是\emph{centrally}规范化的,即,它们在每个点处的相对法线位于相应的中心平面上。特别是研究了切比雪夫向量场的各种性质。我们通过对$\varPhi$中心像的研究来总结本文。

英文摘要:

This paper deals with relative normalizations of skew ruled surfaces in the Euclidean space $\mathbb{E}^{3}$. In section 2 we investigate some new formulae concerning the Pick invariant, the relative curvature, the relative mean curvature and the curvature of the relative metric of a relatively normalized ruled surface $\varPhi$ and in section 3 we introduce some special normalizations of it. All ruled surfaces and their corresponding normalizations that make $\varPhi$ an improper or a proper relative sphere are determined in section 4. In the last section we study ruled surfaces, which are \emph{centrally} normalized, i.e., their relative normals at each point lie on the corresponding central plane. Especially we study various properties of the Tchebychev vector field. We conclude the paper by the study of the central image of $\varPhi$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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