Affiliation: | (1) Department of Mathematics, City College, CUNY, 10031 New York, NY, USA;(2) Mathematics Department, Mount Holyoke College, 01075 So. Hadley, MA;(3) Macalester College, 55105 St. Paul, MN, USA;(4) 24603 Olive Tree Lane, 94024 Los Altos Hills, CA, USA;(5) Department of Computer Science, University of Waterloo, N2L 3G1 Waterloo, Ontario, Canada |