Nelson H. F. Beebe Center for Scientific Computing University of Utah Department of Mathematics, 322 INSCC 155 S 1400 E RM 233 Salt Lake City, UT 84112-0090 USA Tel: +1 801 581 5254 FAX: +1 801 585 1640, +1 801 581 4148 Email: beebe@math.utah.edu, beebe@acm.org, beebe@ieee.org (Internet) URL: http://www.math.utah.edu/~beebe