Fncyclopedia of Number theory gives an undergraduate- level introduction to Number Theory, with ihc emphasis on lulh explained proofs and example, exercise are integrated into the text. In addition lo a careful presentation of the standard material usually taught In a lint course in Number Theory, this book iiKludes (hapten on Divisibility, Prime Numbers and Modular Arithmetic suitable Tor first or second year students at an introduction to the methods of pure mathematics. Klementary ideas about Groups and Rings are also discussed in units. Quadratic Residues and Arithmetic Functions with applications to Enumeration and CnptOflraphy. This nev. volume presents a self-contained Introduction lo Number Theory, requiring background knowledge only of some simple properties of the system of integers. Each topic included in the Chapters are important for degree students of all tniiijti '. imcriilics.