have in common? Well, they are all Putnam Fellows. These are undergraduate students who have been ranked top 5 participants in the famous annual Putnam math competition in USA/Canada. All of them in this list are great problem solvers, and many of them have made significant contributions to cryptography (eg. Don Coppersmith's work on RSA via lattices-he was… (More)
We consider the pattern of zero and nonzero elements in the sequence Akb, where A is an n X n nonnegative matrix and b is an n X 1 nonnegative column vector. We establish a tight bound of k < n for the first occurrence of a given monomial pattern, and we give a graph theoretic characterization of triples (A, b, i) such that there exists a k, k ~ n, for… (More)
The members of the winning team were Nikifor C. Bliznashki, Jason Fer-guson, and Lingren Zhang; each was awarded a prize of $600.