Non-Euclidean Geometry: Fifth Edition - Paperback

by H. S. M. Coxeter (Author)

This textbook introduces non-Euclidean geometry, and the third edition adds a new chapter, including a description of the two families of 'mid-lines' between two given lines and an elementary derivation of the basic formulae of spherical trigonometry and hyperbolic trigonometry, and other new material.