The third edition of this popular textbook has been thoroughly revised and provides an introduction to the differential geometry of curves and surfaces. It covers topics such as Euclidean geometry, curve theory, surface theory, curvature concepts, minimal surfaces, the beginnings of Riemannian geometry, and the Gauss-Bonnet theorem. Moreover, the topic of triangulations is now even more concise and understandable.

Christian Bär, University of Potsdam, Germany.