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Requiring no more than a basic knowledge of abstract algebra, this textbook presents the basics of algebraic number theory in a straightforward, 'down-to-earth' manner. It thus avoids local methods, for example, and presents proofs in a way that highlights key arguments. There are several hundred exercises, providing a wealth of both computational and theoretical practice, as well as appendices summarizing the necessary background in algebra.Now in a newly typeset edition including a foreword by Barry Mazur, this highly regarded textbook will continue to provide lecturers and their students with an invaluable resource and a compelling gateway to a beautiful subject. From the reviews:'A thoroughly delightful introduction to algebraic number theory' - Ezra Brown in the Mathematical Reviews'An excellent basis for an introductory graduate course in algebraic number theory' - Harold Edwards in the Bulletin of the American Mathematical Society