'This is a great book by a great writer. It covers the main topics of combinatorics, is well written and presents many beautiful ideas and techniques. It is very helpful to students, teachers and researchers. I would like to have this book on my desk.' Alexandr Kostochka, University of Illinois 'This is a real gem, capturing the spirit, breadth and depth of combinatorics. Doug West is a master of exposition, his thorough treatment of the subject will be useful for students and researchers in mathematics and computer science.' Noga Alon, Princeton University, New Jersey 'A comprehensive and comprehensible treatment of combinatorial mathematics - what the author intended, and more - a valuable resource on the subject. It may well stimulate the addition to the university curriculum of courses in this area. Borrowing advice from the past, my recommendation for anyone wanting a definitive book on combinatorics is 'Go West, my friend, go West!'' Lowell Beineke, Purdue University Fort Wayne 'I have taught out of this book for many years. It is the ideal textbook for graduate students or advanced undergraduates. The book is filled with lots of great problems that are well suited for homework assignments and potential research projects. Highly recommended.' Arthur Benjamin, Harvey Mudd College, California 'This book is impressive both for its breadth and its hundreds of exercises. Serious study of it will richly reward the reader.' Daniel Cranston, Virginia Commonwealth University