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An Introduction to Difference EquationsSaber ElaydiIn contemplating the third edition, I have had multiple objectives to achieve. The first and foremost important objective is to maintain the accessibility and readability of the book to a broad readership with varying mathematical backgrounds and sophistication. More proofs, more graphs, more explanations, andmore applications are provided in this edition. The second objective is to update the contents of the book so that the reader stays abreast of new developments in this vital area of mathematics. Recent results on local and global stability of onedimensional maps are included in Chapters 1, 4, and Appendices A and C. An extension of the HartmanGrobman Theorem to noninvertible maps is stated in Appendix D. A whole new section on various notions of the asymptoticity of solutions and a recent extension of Perron's Second Theorem are added to Chapter 8. In Appendix E a detailed proof of the LevinMay Theorem is presented. In Chapters 4 and 5, the reader will find the latest results on the larvalpupaladult flour beetle model. The third and final objective is to better serve the broad readership of this book by including most, but certainly not all, of the research areas in difference equations. As more work is being published in the Journal of Difference Equations and Applications and elsewhere, it became apparent that a whole chapter needed to be dedicated to this enterprise. With the prodding and encouragement of Gerry Ladas, the new Chapter 5 was born. Major revisions of this chapter were made by Fozi Dannan, who diligently and painstakingly rewrote part of the material and caught several errors and typos. His impact on this edition, particularly in Chapters 1, 4, and Chapter 8 is immeasurable and I am greatly indebted to him. My thanks go to Shandelle Henson, who wrote a thorough review of the book and suggested the inclusion of an extension of the HartmanGroman Theorem, and to Julio Lopez and his student Alex Sepulveda for their comments and discussions about the second edition.Hardcover: $69.95 (in the United States), ISBN 0387230599. Orders may also be placed with Springer: telephone (in the United States) 8007774643; outside North America contact Springer.

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