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Title: A sheer delight
Review: This short book on number theory by one of the giants of 20th century mathematics is delightful to read. Its length motivates one to finish the book, and it is packed full of interesting results. Most of the theory discussed in the book has wide-ranging applications, such as cryptography and dynamical systems. The last chapter of the book is the best and covers the subject of modular forms, including theta functions, Hecke operators, and general modular functions. If you want to understand the Wiles proof of Fermat's last theorem, start with this book.
