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RIGONOMETRY IN EXTENDED HYPERBOLIC SPACE AND EXTENDED DE SITTER SPACE

  • Cho, Yun-Hi (Department of Mathematics University of Seoul)
  • Published : 2009.11.30

Abstract

We study the hyperbolic cosine and sine laws in the extended hyperbolic space which contains hyperbolic space as a subset and is an analytic continuation of the hyperbolic space. And we also study the spherical cosine and sine laws in the extended de Sitter space which contains de Sitter space S$^n_1$ as a subset and is also an analytic continuation of de Sitter space. In fact, the extended hyperbolic space and extended de Sitter space are the same space only differ by -1 multiple in the metric. Hence these two extended spaces clearly show and apparently explain that why many corresponding formulas in hyperbolic and spherical space are very similar each other. From these extended trigonometry laws, we can give a coherent and geometrically simple explanation for the various relations between the lengths and angles of hyperbolic polygons, and relations on de Sitter polygons which lie on S$^2_1$, and tangent laws for various polyhedra.

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  2. On the area of a trihedral on a hyperbolic plane of positive curvature vol.25, pp.2, 2015, https://doi.org/10.3103/S1055134415020042
  3. Inequalities of trihedrals on a hyperbolic plane of positive curvature vol.58, pp.4, 2017, https://doi.org/10.1007/s13366-017-0339-5
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  5. The analytic continuation of hyperbolic space vol.161, pp.1, 2012, https://doi.org/10.1007/s10711-012-9698-0
  6. Duality structures and discrete conformal variations of piecewise constant curvature surfaces vol.320, 2017, https://doi.org/10.1016/j.aim.2017.08.043