in fractions, 99
placeholder, 90
special properties of, 38
symbol, 10
Zero dimension, 169–70
Zero: The Biography of a
Dangerous Idea(Seife and
Zimet), 453
Zetetics, 134
Zimet, Matt, 453
ZIP Code, 403
Zuse, Konrad, 362, 363506
Handy Math BM 8/19/07 5:18 PM Page 506