This book gives a rigorous treatment of the fundamentals of plane geometry: Euclidean, spherical, elliptical and hyperbolic. The primary purpose is to acquaint the reader with the classical results of ...

This is a reissue of Professor Coxeter's classic text on non-Euclidean geometry. It begins with a historical introductory chapter, and then devotes three chapters to surveying real projective geometry ...

LOBATSCHEWSKY shares with the Bolyais the credit of founding the theory of non-Euclidean geometry, in which Euclid's axiom of parallels is not assumed to be true. His “Pangéométrie” was ...