Subjects: “...Mathematics; Hyperbolic Geometry;Hyperbolic Plane....”

Table of Contents: “.... Hyperbolic geometry: the disc model; 7. Elliptic geometry: the spherical model; 8. The Kleinian view...”
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Table of Contents: “... -- Section 4 More History -- Saccheri, Bolyai, and Lobachevsky 226 -- Section 5 Hyperbolic Geometry 230...”