Frontmatter -- I. Preliminaries -- II. The Möbius Group -- III. The Basic Notions of Hyperbolic Geometry -- IV. The Isometry Group of Hyperbolic Space -- V. Lines -- VI. Right-Angled Hexagons -- VII. Points and Planes -- VIII. Spherical Surfaces -- IX. Area and Volume -- References -- Index -- Backmatter
Werner Fenchel
Mathematics Geometry and Topology Geometry and Topology