
Introduction  Table of Contents  Supplementary Material 
Clay Mathematics Monographs 2007; 521 pp; hardcover Volume: 3 ISBN10: 0821843281 ISBN13: 9780821843284 List Price: US$71 Member Price: US$56.80 Order Code: CMIM/3 See also: Ricci Flow and Geometrization of 3Manifolds  John W Morgan and Frederick TszHo Fong The Scientific Legacy of Poincaré  Eric Charpentier, Etienne Ghys and Annick Lesne Ricci Flow and the Sphere Theorem  Simon Brendle  For over 100 years the Poincaré Conjecture, which proposes a topological characterization of the 3sphere, has been the central question in topology. Since its formulation, it has been repeatedly attacked, without success, using various topological methods. Its importance and difficulty were highlighted when it was chosen as one of the Clay Mathematics Institute's seven Millennium Prize Problems. In 2002 and 2003 Grigory Perelman posted three preprints showing how to use geometric arguments, in particular the Ricci flow as introduced and studied by Hamilton, to establish the Poincaré Conjecture in the affirmative. This book provides full details of a complete proof of the Poincaré Conjecture following Perelman's three preprints. After a lengthy introduction that outlines the entire argument, the book is divided into four parts. The first part reviews necessary results from Riemannian geometry and Ricci flow, including much of Hamilton's work. The second part starts with Perelman's length function, which is used to establish crucial noncollapsing theorems. Then it discusses the classification of noncollapsed, ancient solutions to the Ricci flow equation. The third part concerns the existence of Ricci flow with surgery for all positive time and an analysis of the topological and geometric changes introduced by surgery. The last part follows Perelman's third preprint to prove that when the initial Riemannian 3manifold has finite fundamental group, Ricci flow with surgery becomes extinct after finite time. The proofs of the Poincaré Conjecture and the closely related 3dimensional spherical spaceform conjecture are then immediate. The existence of Ricci flow with surgery has application to 3manifolds far beyond the Poincaré Conjecture. It forms the heart of the proof via Ricci flow of Thurston's Geometrization Conjecture. Thurston's Geometrization Conjecture, which classifies all compact 3manifolds, will be the subject of a followup article. The organization of the material in this book differs from that given by Perelman. From the beginning the authors present all analytic and geometric arguments in the context of Ricci flow with surgery. In addition, the fourth part is a muchexpanded version of Perelman's third preprint; it gives the first complete and detailed proof of the finitetime extinction theorem. With the large amount of background material that is presented and the detailed versions of the central arguments, this book is suitable for all mathematicians from advanced graduate students to specialists in geometry and topology. The Clay Mathematics Institute Monograph Series publishes selected expositions of recent developments, both in emerging areas and in older subjects transformed by new insights or unifying ideas. Titles in this series are copublished with the Clay Mathematics Institute (Cambridge, MA). Readership Graduate students and research mathematicians interested in geometry and topology. Reviews "The comprehensive and carefully detailed nature of the text makes this book an invaluable resource for any mathematician who wants to understand the technical nuts and bolts of the proof, while the introductory chapter provides an excellent conceptual overview of the entire argument."  Mathematical Reviews 


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