DOI QR코드

DOI QR Code

AN ELEMENTARY PROOF OF SFORZA-SANTALÓ RELATION FOR SPHERICAL AND HYPERBOLIC POLYHEDRA

  • Cho, Yunhi (Department of Mathematics University of Seoul)
  • Received : 2012.05.03
  • Published : 2013.10.31

Abstract

We defined and studied a naturally extended hyperbolic space (see [1] and [2]). In this study, we describe Sforza's formula [7] and Santal$\acute{o}$'s formula [6], which were rediscovered and later discussed by many mathematicians (Milnor [4], Su$\acute{a}$rez-Peir$\acute{o}$ [8], J. Murakami and Ushijima [5], and Mednykh [3]) in the spherical space in an elementary way. Thereafter, using the extended hyperbolic space, we apply the same method to prove their results in the hyperbolic space.

Keywords

References

  1. Y. Cho, Trigonometry in extended hyperbolic space and extended de Sitter space, Bull. Korean Math. Soc. 46 (2009), no. 6, 1099-1133. https://doi.org/10.4134/BKMS.2009.46.6.1099
  2. Y. Cho and H. Kim, The analytic continuation of hyperbolic space, Geom. Dedicata 161 (2012), no. 1, 129-155. https://doi.org/10.1007/s10711-012-9698-0
  3. A. D. Mednykh, Hyperbolic and spherical volume for knots, links and polyhedra, Summer school and conference on Geometry and Topology of 3-manifolds, Trieste-Italy, 6-24 June 2005.
  4. J. Milnor, The Schlafli Differential Equality, Collected papers, Vol. 1, Publish or Perish, Houston, Texas, 1994.
  5. J. Murakami and A. Ushijima, A volume formula for hyperbolic tetrahedra in terms of edge lengths, J. Geom. 83 (2005), no. 1-2, 153-163. https://doi.org/10.1007/s00022-005-0010-4
  6. L. Santalo, Integral Geometry and Geometric Probability, Encyclopedia of Mathematics and its Applications, Vol. 1, Addison-Wesley, 1976.
  7. G. Sforza, Spazi metrico-proiettivi, Ricerche di Estensionimetria differenziale, Serie III, VIII (1906), 3-66.
  8. E. Suarez-Peiro, A Schlafli differential formula for simplices in semi-Riemannian hyperquadrics, Gauss-Bonnet formulas for simplices in the de Sitter sphere and the dual volume of a hyperbolic simplex, Pacific J. Math. 194 (2000), no. 1, 229-255. https://doi.org/10.2140/pjm.2000.194.229