About the authors RONALD L. GRAHAM is Adjunct Director for Research at AT&T Bell Laboratories, and University Professor of the Mathematical Sciences at Rutgers University. He is coauthor of Concrete Mathematics and of Old and New Problems in Combinatorial Number Theory, and serves on the editorial boards of more than 25 technical journals. He received his PhD in mathematics from the University of California, Berkeley. BRUCE L. ROTHSCHILD is Professor of Mathematics at the University of...See more