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Nash, John Forbes

(born June 13, 1928, Bluefield, W.Va., U.S.) U.S. mathematician. He earned a doctorate from Princeton University at 22. He began teaching at Massachusetts Institute of Technology in 1951 but left in the late 1950s because of mental illness; thereafter he was informally associated with Princeton. Beginning in the 1950s with his influential thesis “Non-cooperative Games,” Nash established the mathematical principles of game theory. His theory, known as the Nash solution or Nash equilibrium, attempted to explain the dynamics of threat and action among competitors. Despite its practical limitations, it was widely applied by business strategists. He shared the 1994 Nobel Prize in Economics with John C. Harsanyi (b. 1920) and Reinhard Selten (b. 1930). A film version of his life, A Beautiful Mind (2001), won an Academy Award for best picture.

game theory
n.
A mathematical method of decision-making in which a competitive situation is analyzed to determine the optimal course of action for an interested party, often used in political, economic, and military planning. Also called theory of games.

games, theory of, group of mathematical theories first developed by John Von Neumann and Oskar Morgenstern. A game consists of a set of rules governing a competitive situation in which from two to n individuals or groups of individuals choose strategies designed to maximize their own winnings or to minimize their opponent's winnings; the rules specify the possible actions for each player, the amount of information received by each as play progresses, and the amounts won or lost in various situations. Von Neumann and Morgenstern restricted their attention to zero-sum games, that is, to games in which no player can gain except at another's expense.
This restriction was overcome by the work of John F. Nash during the early 1950s. Nash mathematically clarified the distinction between cooperative and noncooperative games. In noncooperative games, unlike cooperative ones, no outside authority assures that players stick to the same predetermined rules, and binding agreements are not feasible. Further, he recognized that in noncooperative games there exist sets of optimal strategies (so-called Nash equilibria) used by the players in a game such that no player can benefit by unilaterally changing his or her strategy if the strategies of the other players remain unchanged. Because noncooperative games are common in the real world, the discovery revolutionized game theory. Nash also recognized that such an equilibrium solution would also be optimal in cooperative games. He suggested approaching the study of cooperative games via their reduction to noncooperative form and proposed a methodology, called the Nash program, for doing so. Nash also introduced the concept of bargaining, in which two or more players collude to produce a situation where failure to collude would make each of them worse off.

The theory of games applies statistical logic to the choice of strategies. It is applicable to many fields, including military problems and economics. The Nobel Memorial Prize in Economic Sciences was awarded to Nash, John Harsanyi, and Reinhard Selten (1994) and to Robert J. Aumann and Thomas C. Schelling (2005) for work in applying game theory to aspects of economics.

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