NORM DERIVATIVES & CHARACTERIZATIONS...

“This book is a nicely written and useful textbook with an excellent presentation of the state-of-the-art … Specially remarkable are the very interesting sections dealing with the generalization of some basic geometrical properties of triangles … the most salient feature of this book lies in the introduction of new techniques for solving functional equations and inequalities involving norm derivatives, as well as in the characterization of the Banach Spaces which are Hilbert Spaces.”

“The book is useful for specialists and graduate students interested in the geometry of Banach spaces and related topics.”