Helmut Hofer, Institute for Advanced Study, Princeton.Siobhan Roberts, Journalist, Toronto, Canada

The Floer Jungle is a first-hand account of the birth of a new mathematical field, and at the same time a touching memorial to its creator-both depicted with a richness and complexity that is far too often absent in our textbooks and papers."" - Akshay Venkatesh, Institute for Advanced Study ""The subject of symplectic mathematics, a modern development of classical mechanics, was completely transformed by the development of Floer theory. The ideas connect even long-standing problems like the three-body problem with modern developments in topology-I haven't been to a seminar in the subject which did not use it as a tool. The Floer Jungle explains this development, connects it with the tragic personal life of Andreas Floer, and gives clues about how the mathematical community reacts to new developments. There are very few books in mathematics which do this, despite an extensive literature of this sort in other disciplines. It is particularly timely, as many of the players (myself included) are still around to report on their memories."" - Karen Uhlenbeck, University of Texas at Austin and Institute for Advanced Study

• Foundation; Birth-death; The (bad) action functional; Moser's error and beyond; Progress; From Duisburg to Berkeley; The magic; Smuggling ideas; Breakthrough; Floer between Berkeley, Bochum, and beyond; World premiere; Getting inside Floer's head; Symplectic lift-off; Thereafter; Epilogue; Floer's bibliography; Qualifying exam; Arbeitstagung, June 14 1986; Progress report; The (PS) extension; There's a lot of room in infinite dimensions; Analysis of $\mathcal{A}_{ {\mathbb{R}^{2n}}$; Arnold's motiviation; Details for the magic; From cartoon to theory; Notes; Acknowledgments; Image credits; Bibliography; Index of names; General index

Helmut Hofer, Institute for Advanced Study, Princeton.Siobhan Roberts, Journalist, Toronto, Canada

The Floer Jungle is a first-hand account of the birth of a new mathematical field, and at the same time a touching memorial to its creator-both depicted with a richness and complexity that is far too often absent in our textbooks and papers."" - Akshay Venkatesh, Institute for Advanced Study ""The subject of symplectic mathematics, a modern development of classical mechanics, was completely transformed by the development of Floer theory. The ideas connect even long-standing problems like the three-body problem with modern developments in topology-I haven't been to a seminar in the subject which did not use it as a tool. The Floer Jungle explains this development, connects it with the tragic personal life of Andreas Floer, and gives clues about how the mathematical community reacts to new developments. There are very few books in mathematics which do this, despite an extensive literature of this sort in other disciplines. It is particularly timely, as many of the players (myself included) are still around to report on their memories."" - Karen Uhlenbeck, University of Texas at Austin and Institute for Advanced Study

• Foundation; Birth-death; The (bad) action functional; Moser's error and beyond; Progress; From Duisburg to Berkeley; The magic; Smuggling ideas; Breakthrough; Floer between Berkeley, Bochum, and beyond; World premiere; Getting inside Floer's head; Symplectic lift-off; Thereafter; Epilogue; Floer's bibliography; Qualifying exam; Arbeitstagung, June 14 1986; Progress report; The (PS) extension; There's a lot of room in infinite dimensions; Analysis of $\mathcal{A}_{ {\mathbb{R}^{2n}}$; Arnold's motiviation; Details for the magic; From cartoon to theory; Notes; Acknowledgments; Image credits; Bibliography; Index of names; General index

Helmut Hofer, Institute for Advanced Study, Princeton.Siobhan Roberts, Journalist, Toronto, Canada

The Floer Jungle is a first-hand account of the birth of a new mathematical field, and at the same time a touching memorial to its creator-both depicted with a richness and complexity that is far too often absent in our textbooks and papers."" - Akshay Venkatesh, Institute for Advanced Study ""The subject of symplectic mathematics, a modern development of classical mechanics, was completely transformed by the development of Floer theory. The ideas connect even long-standing problems like the three-body problem with modern developments in topology-I haven't been to a seminar in the subject which did not use it as a tool. The Floer Jungle explains this development, connects it with the tragic personal life of Andreas Floer, and gives clues about how the mathematical community reacts to new developments. There are very few books in mathematics which do this, despite an extensive literature of this sort in other disciplines. It is particularly timely, as many of the players (myself included) are still around to report on their memories."" - Karen Uhlenbeck, University of Texas at Austin and Institute for Advanced Study

• Foundation; Birth-death; The (bad) action functional; Moser's error and beyond; Progress; From Duisburg to Berkeley; The magic; Smuggling ideas; Breakthrough; Floer between Berkeley, Bochum, and beyond; World premiere; Getting inside Floer's head; Symplectic lift-off; Thereafter; Epilogue; Floer's bibliography; Qualifying exam; Arbeitstagung, June 14 1986; Progress report; The (PS) extension; There's a lot of room in infinite dimensions; Analysis of $\mathcal{A}_{ {\mathbb{R}^{2n}}$; Arnold's motiviation; Details for the magic; From cartoon to theory; Notes; Acknowledgments; Image credits; Bibliography; Index of names; General index