1. Department of Mathematics, Hofstra University, Room 306, Roosevelt Hall, Hempstead, NY 11549-0114, USA. johanna.n.franklin@hofstra.edu, http://people.hofstra.edu/Johanna_N_Franklin/
2. Department of Mathematics, University of Connecticut, 196 Auditorium Road, Unit 3009, Storrs, CT 06269-3009, USA. david.solomon@uconn.edu, http://www.math.uconn.edu/~solomon