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The book timely surveys new research results and related developments in Diophantine approximation, a division of number theory which deals with the approximation of real numbers by rational numbers. The book is appended with a list of challenging open problems and a comprehensive list of references. From the contents: Field extensions * Algebraic numbers * Algebraic geometry * Height functions * The abc-conjecture * Roth's theorem * Subspace theorems * Vojta's conjectures * L-functions.