内容简介
Thisaccessibleapproachfeaturestwovarietiesofproofs:stereometricandplanimetric,aswellaselementaryproofsthatemployonlythesimplestpropertiesoftheplane.Ashorthistoryofgeometryprecedesasystematicexpositionoftheprinciplesofnon-Euclideangeometry,fromfundamentalprinciplestothefinerpoints.