By Constantinos Daskalakis, Paul W. Goldberg, Christos H. Papadimitriou
Communications of the ACM,
February 2009,
Vol. 52 No. 2, Pages 89-97
10.1145/1461928.1461951 Comments
An illustration of Nash's function for the penalty shot game.
Traditionally, computational problems fall into two classes: those that have a polynomial-time algorithm and those that are NP-hard. However, the concept of NP-hardness cannot be applied to the rare problems where "every instance has a solution."
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