Preface to the Second EditionThe second edition is a significantly revised and expanded version. The introductions tomany sections were rewritten, adopting a more user-friendly style with more accessibleand inviting examples. The material has been updated with more than 70 recentproblems and examples. Figures were added in some of the solutions to geometryproblems. Reader suggestions have been incorporated.We would like to thank Dorin Andrica and Iurie Boreico for their suggestions andcontributions. Also, we would like to express our deep gratitude to Richard Stong forreading the entire manuscript and considerably improving its content.Titu AndreescuUniversity of Texas at DallasR˘azvan GelcaTexas Tech UniversityApril 2008
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