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Spherical Geometry—A Survey on Width and Thickness of Convex Bodies

In: Surveys in Geometry I

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  • Marek Lassak

    (University of Science and Technology, Institute of Mathematics and Physics)

Abstract

This chapter concerns the geometry of convex bodies on the d-dimensional sphere S d. We concentrate on the results based on the notion of width of a convex body C ⊂ S d determined by a supporting hemisphere of C. Important tools are the lunes containing C. The supporting hemispheres take over the role of the supporting half-spaces of a convex body in Euclidean space, and lunes the role of strips. Also essential is the notion of thickness of C, i.e., its minimum width. In particular, we describe properties of reduced spherical convex bodies and spherical bodies of constant width. The last notion coincides with the notions of complete bodies and bodies of constant diameter on S d. The results reminded and commented on here concern mostly the width, thickness, diameter, perimeter, area and extreme points of spherical convex bodies, reduced bodies and bodies of constant width.

Suggested Citation

  • Marek Lassak, 2022. "Spherical Geometry—A Survey on Width and Thickness of Convex Bodies," Springer Books, in: Athanase Papadopoulos (ed.), Surveys in Geometry I, chapter 0, pages 7-47, Springer.
    • Handle: RePEc:spr:sprchp:978-3-030-86695-2_2
    DOI: 10.1007/978-3-030-86695-2_2
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