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Pell's equation is an important topic of algebraic number theory that involves quadratic forms and the structure of rings of integers in algebraic number fields. The history of this equation is long and circuitous, and involved a number of different approaches before a definitive theory was found. There were partial patterns and quite effective methods of finding solutions, but a complete theory did not emerge until the end of the eighteenth century.
The topic is motivated and developed through sections of exercises which allow the student to recreate known theory and provide a focus for their algebraic practice. There are also several explorations that encourage the reader to embark on their own research. Some of these are numerical and often require the use of a calculator or computer. Others introduce relevant theory that can be followed up on elsewhere, or suggest problems that the reader may wish to pursue. A high school background in mathematics is all that is needed to get into this book, and teachers and others interested in mathematics who do not have a background in advanced mathematics may find that it is a suitable vehicle for keeping up an independent interest in the subject.
Edward Barbeau is Professor of Mathematics at the University of Toronto. He has published a number of books directed to students of mathematics and their teachers, including Polynomials (Springer 1989), Power Play (MAA 1997), Fallacies, Flaws and Flimflam (MAA 1999) and After Math (Wall & Emerson, Toronto 1995).
 Reviews

From the reviews:
"This book belongs to the collection ‘Problem Books in Mathematics’. Because of this choice, this book is not a course on Pell’s equation but a series of exercises which presents the theory of this equation … . This book is certainly a good book for students who are courageous enough to try to solve many exercises; they can learn a lot this way. Moreover, this long collection of exercises presents a lot of examples and a great variety of methods." (Maurice Mignotte, Zentralblatt MATH, Vol. 1030, 2004)
"This is Barbeau’s second book in the Springer Problem Books in Mathematics series … . Brief hints are given at the end of each chapter and Answers and Solutions are given at the end of the book … . All of the material in the book is aimed at undergraduate level. … The book does provide a good source of exercises and interesting ideas for student projects, as well as giving a reasonably thorough account of the solutions, applications and generalisations of Pell’s Equation." (Peter G. Brown, The Australian Mathematical Society Gazette, Vol. 30 (4), 2003)
"The present book is described by its author as a ‘focussed exercise book in algebra’, and is aimed at both college students and talented sixthformers, with the particular intention of providing training in the key skills of manipulating algebraic expressions judiciously, and with a sense of strategy. … readers are encouraged to do much of the exploring for themselves through carefully guided examples … . The book is full of interest, and largely succeeds in its aims." (Michael Ward, The Mathematical Gazette, Vol. 88 (512), 2004)
"Ed Barbeau has prepared a ‘focused exercise book in algebra’ based on various aspects of Pell’s equation. … The author does a wonderful job in preparing and motivating the reader … . An array of interesting related problems, facts, and ‘explorations’ are found here. … This book is a stepping stone towards any one of the several related areas of study, including diophantine analysis, diophantine approximation, algebraic number theory … . It is perfectly suited for any first course in number theory." (Gary Walsh, SIAM Review, Vol. 46 (1), 2004)
"The author’s book, as the title indicates, is primarily concerned with aspects of Pell’s equations … . The book has nine chapters … followed by extensive answers, comments and solutions to posed problems and explorations, a glossary of several pages, separate references to books and papers, and a brief index. … would also be suitable for any person interested in number theory. … The book reveals the enduring interest by mathematicians in Pell’s equation … ." (George W. Grossman, Mathematical Reviews, 2004f)
"Barbeau develops the theory of Pell’s equation (a piece of quadratic form theory) entirely as a series of exercises. … The book’s form recommends it for shepherding undergraduates to research, and is a good source for higherdegree analogs of Pell’s equation. Includes problem answers and solutions." (D.V. Feldman, CHOICE, December, 2003)
"Pell’s equation is an important topic of algebraic number theory that involves quadratic forms and the structure of rings of integers in algebraic number fields. … The topic is motivated and developed through sections of exercises that allow students to recreate known theory and provide a focus for their algebraic practice. There are also several explorations that encourage readers to embark on their own research." (Zentralblatt für Didaktik der Mathematik, August, 2003)
"Pell’s equations are … as old as mathematics, but the theory of these equations is a modern branch of mathematics development. … This book is a curious exercise book, but it is much more. … The exercises, explorations are wellchosen, showing the real nature of mathematical thinking … . Without any special background you will enjoy the problems throwing you in the very heart of this science. … Whoever you are … you will find some beautiful, mind awakening problems in this book." (Lajos Pintér, Acta Scientiarum Mathematicarum, Vol. 74, 2008)
 Table of contents (9 chapters)


The Square Root of 2
Pages 115

Problems Leading to Pell’s Equation and Preliminary Investigations
Pages 1631

Quadratic Surds
Pages 3242

The Fundamental Solution
Pages 4354

Tracking Down the Fundamental Solution
Pages 5580

Table of contents (9 chapters)
 Download Preface 1 PDF (56.2 KB)
 Download Sample pages 2 PDF (622.5 KB)
 Download Sample pages 7 PDF (618.4 KB)
 Download Table of contents PDF (27.4 KB)
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Bibliographic Information
 Bibliographic Information

 Book Title
 Pell’s Equation
 Authors

 Edward J. Barbeau
 Series Title
 Problem Books in Mathematics
 Copyright
 2003
 Publisher
 SpringerVerlag New York
 Copyright Holder
 Springer Science+Business Media New York
 eBook ISBN
 9780387226026
 DOI
 10.1007/b97610
 Hardcover ISBN
 9780387955292
 Softcover ISBN
 9781441930408
 Series ISSN
 09413502
 Edition Number
 1
 Number of Pages
 XII, 212
 Topics