"This book succeeds brilliantly by concentrating on a number of core
topics...and by treating them in a hugely rich and varied way. The
author ensures that the reader will learn a large amount of classical
material and perhaps more importantly, will also learn that there is no
one approach to the subject. The essence lies in the range and interplay
of possible approaches. The author is to be congratulated on a work of
deep and enthusiastic scholarship." --MATHEMATICAL REVIEWS