From the reviews of the fourth edition: "This is the fourth edition of a book that became a classic on its first appearance in 1998. ... The authors have tried, in homage to Erdos, to approximate this tome; successive editions appear to be achieving uniform convergence. ... Five new chapters have been added ... . there is enough new material that libraries certainly should do so. For individuals who do not yet have their own copies, the argument for purchase has just grown stronger." (Robert Dawson, Zentralblatt MATH, February, 2010) "This book is the fourth edition of Aigner and Ziegler's attempt to find proofs that Erdos would find appealing. ... this one is a great collection of remarkable results with really nice proofs. The authors have done an excellent job choosing topics and proofs that Erdos would have appreciated. ... the proofs are largely accessible to readers with an undergraduate-level mathematics background. ... I love the fact that the chapters are relatively short and self-contained. ... this is a very nice book." (Donald L. Vestal, The Mathematical Association of America, May, 2010) "Martin Aigner and Gunter Ziegler succeeded admirably in putting together a broad collection of theorems and their proofs that would undoubtedly be in the Book of Erdos. The theorems are so fundamental, their proofs so elegant, and the remaining open questions so intriguing that every mathematician, regardless of speciality, can benefit from reading this book. The book has five parts of roughly equal length." (Mikl s B na, The Book Review Column, 2011) "Paul Erdos ... had his own way of judging the beauty of various proofs. He said that there was a book somewhere, possibly in heaven, and that book contained the nicest and most elucidating proof of every theorem in mathematics. ... Martin Aigner and Gunter Ziegler succeeded admirably in putting together a broad collection of theorems ... that would undoubtedly be in the Book of Erdos. The theorems are so fundamental ... that every mathematician, regardless of speciality, can benefit from reading this book." (Miklos Bona, SIGACT News, Vol. 42. (3), September, 2011) From the reviews of the third edition: "... It is unusual for a reviewer to have the opportunity to review the first three editions of a book - the first edition was published in 1998, the second in 2001 and the third in 2004. ... I was fortunate enough to obtain a copy of the first edition while travelling in Europe in 1999 and I spent many pleasant hours reading it carefully from cover to cover. The style is inviting and it is very hard to stop part way through a chapter. Indeed I have recommended the book to talented undergraduates and to mathematically literate friends. All report that they are captivated by the material and the new view of mathematics it engenders. By now a number of reviews of the earlier editions have appeared and I must simply agree that the book is a pleasure to hold and to look at, it has striking photographs, instructive pictures and beautiful drawings. The style is clear and entertaining and the proofs are brilliant and memorable. ... David Hunt, The Mathematical Gazette, Vol. 32, Issue 2, p. 127-128 "The newest edition contains three completely new chapters. ... The approach is refreshingly straightforward, all the necessary results from analysis being summarised in boxes, and a short appendix discusses the importance of the zeta-function in number theory. ... this edition also contains additional material interpolated in the original text, notably the Calkin-Wilf enumeration of the rationals." (Gerry Leversha, The Mathematical Gazette, March, 2005) "A lot of solid mathematics is packed into Proofs. Its thirty chapters, divided into sections on Number Theory, Geometry, Analysis ... . Each chapter is largely independent; some include necessary background as an appendix. ... The key to the approachability of Proofs lies not so much in the accessibility of its mathematics, however, as in the rewards it offers: elegant proofs of interesting results, which don't leave the reader feeling cheated or disappointed." (Zentralblatt fur Didaktik de Mathematik, July, 2004)

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