Affiliation: | Department of Mathematics, Wellesley College 366 Science Center, 106 Central Street, Wellesley, MA 02181, U.S.A. Department of Computer Science, Wellesley College E114 Science Center, 106 Central Street, Wellesley, MA 02181, U.S.A. Center for Applied Mathematics, Cornell University, Ithaca, NY 14853, U.S.A. |