The number of ways in which a group of with weights can change a losing coalition (one with ) to a winning one, or vice versa. It was proposed by the lawyer J. F. Banzhaf in 1965.

**References**

Paulos, J. A. *A Mathematician Reads the Newspaper.* New York: BasicBooks, pp. 9-10, 1995.

© 1996-9

1999-05-26