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Cambridge Tracts in Mathematics

This series is devoted to thorough, yet reasonably concise treatments of topics in any branch of mathematics. Typically, a Tract takes up a single thread in a wide subject, and follows its ramifications, thus throwing light on various of its aspects. Tracts are expected to be rigorous, definitive and of lasting value to mathematicians working in the relevant disciplines. Exercises can be included to illustrate techniques, summarize past work and enhance the book's value as a seminar text.

Editorial Board: Jean Bertoin, University of Zurich; Béla Bollobás, University of Cambridge; William Fulton, University of Michigan; Bryna Kra, Northwestern University, Illinois; Ieke Moerdijk, Utrecht University; Cheryl Praeger, University of Western Australia; Peter Sarnak, Princeton University, New Jersey; Barry Simon, California Institute of Technology; Burt Totaro, University of California, Los Angeles