9780817645489 | Birkhauser, October 12, 2010, cover price $59.95 | About this edition: This problem-solving book is an introduction to the study of Diophantine equations, a class of equations in which only integer solutions are allowed.

9780817632458 | Birkhauser, May 30, 2009, cover price $59.95 | About this edition: This introductory textbook takes a problem-solving approach to number theory, situating each concept within the framework of an example or a problem for solving.

9780817643607 | Birkhauser, January 11, 2011, cover price $59.95 | About this edition: Rooted in a pedagogically successful problem-solving approach to linear algebra, this work fills a gap in the literature that is sharply divided between, on the one end, elementary texts with only limited exercises and examples, and, at the other end, books too advanced in prerequisites and too specialized in focus to appeal to a wide audience.

9780387351568 | Springer Verlag, November 30, 2012, cover price $59.95 | About this edition: This text treats the classical theory of quadratic diophantine equations and guides the reader through the last two decades of computational techniques and progress in the area.

9780817645274 | Birkhauser, November 30, 2006, cover price $49.95 | About this edition: This challenging problem book by renowned US Olympiad coaches, mathematics teachers, and researchers develops a multitude of problem-solving skills needed to excel in mathematical contests and in mathematical research in number theory.

9780817643263 | Birkhauser, October 24, 2005, cover price $49.95 | About this edition: * Learn how complex numbers may be used to solve algebraic equations, as well as their geometric interpretation * Theoretical aspects are augmented with rich exercises and problems at various levels of difficulty * A special feature is a selection of outstanding Olympiad problems solved by employing the methods presented * May serve as an engaging supplemental text for an introductory undergrad course on complex numbers or number theory