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arXiv 0810.5303math.DG
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双曲几何与de Sitter几何的对偶性

Duality between Hyperbolic and de Sitter Geometry

Immanuel Asmus

摘要:

本文描述了de Sitter曲面上的三角学。为此,给出了测地线的特征,从而得到各种类型的三角形。我们定义了它们的长度和角度。然后,将球面几何中的极三角形的概念转移到Minkowski空间中,将双曲三角形与de Sitter三角形联系起来,从而使角的双曲余弦定律的证明比传统的证明更加清晰和容易。此外,极三角形是描述德西特三角学的一个有力工具。

英文摘要:

In this paper we describe trigonometry on the de Sitter surface. For that a characterization of geodesics is given, leading to various types of triangles. We define lengths and angles of these. Then, transferring the concept of polar triangles from spherical geometry into the Minkowski space, we relate hyperbolic with de Sitter triangles such that the proof of the hyperbolic law of cosines for angles becomes much clearer and easier than it is traditionally. Furthermore, polar triangles turn out to be a powerful tool for describing de Sitter trigonometry.

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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