""The Handbook of Combinatorics" will be a work of quality and significance in what has become, over the past 20 years, one of the most active and fruitful areas of mathematical research. The editors, who are top people in the field, have collected a distinguished group of authors. The "Handbook" will be a major and central scholarly work." -- Hartley Rogers, Jr., Professor, Massachusetts Institute of Technology Combinatorics research, the branch of mathematics that deals with the study of discrete, usually finite, structures, covers a wide range of problems not only in mathematics but also in the biological sciences, engineering, and computer science. "The Handbook of Combinatorics" brings together almost every aspect of this enormous field and is destined to become a classic. Ronald L. Graham, Martin Grö tschel, and Lá szló Lová sz, three of the world's leading combinatorialists, have compiled a selection of articles that cover combinatorics in graph theory, theoretical computer science, optimization, and convexity theory, plus applications in operations research, electrical engineering, statistical mechanics, chemistry, molecular biology, pure mathematics, and computer science.