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Banzhaf Power Index

The number of ways in which a group of $n$ with weights $\sum_{i=1}^n w_i=1$ can change a losing coalition (one with $\sum w_i<1/2$) to a winning one, or vice versa. It was proposed by the lawyer J. F. Banzhaf in 1965.


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

© 1996-9 Eric W. Weisstein