A Simple Non-Euclidean Geometry and Its Physical Basis : An Elementary Account of Galilean Geometry and the Galilean Principle of Relativity

This geometry, also called hyperbolic geometry, is part of the required subject matter of many mathematics departments in universities and teachers' colleges-a reflec­ tion of the view that familiarity with the elements of hyperbolic geometry is a useful part of the background of future high school teachers.