Non-Euclidean Geometry

Non-Euclidean Geometry is now recognized as an important branch of Mathematics.Those who teach Geometry should have some knowledge of this subject, and all who are interested in Mathematics will find much to stimulate them andmuch for them to enjoy in the novel results and views that it presents.This book is an attempt to give a simple and direct account of the Non-Euclidean Geometry, and one which presupposes but little knowledge of Mathematics.The first three chapters assume a knowledge of only Plane and SolidGeometry and Trigonometry, and the entire book can be read by one who hastaken the mathematical courses commonly given in our colleges