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A symbolic shortest path algorithm for computing subgame-perfect Nash equilibria

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Góngora P., Rosenblueth D.

International Journal of Applied Mathematics and Computer Science

2015

tom 25

nr 3

577-596

Consider games where players wish to minimize the cost to reach some state. A subgame-perfect Nash equilibrium can be regarded as a collection of optimal paths on such games. Similarly, the well-known state-labeling algorithm used in model checking can be viewed as computing optimal paths on a Kripke structure, where each path has a minimum number of transitions. We exploit these similarities in a common generalization of extensive games and Kripke structures that we name “graph games”. By extending the Bellman-Ford algorithm for computing shortest paths, we obtain a model-checking algorithm for graph games with respect to formulas in an appropriate logic. Hence, when given a certain formula, our model-checking algorithm computes the subgame-perfect Nash equilibrium (as opposed to simply determining whether or not a given collection of paths is a Nash equilibrium). Next, we develop a symbolic version of our model checker allowing us to handle larger graph games. We illustrate our formalism on the critical-path method as well as games with perfect information. Finally, we report on the execution time of benchmarks of an implementation of our algorithms.

Ograniczanie wyników

1 International Journal of Applied Mathematics and Computer Science

1 Góngora P.

1 Rosenblueth D.

1 2015

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A symbolic shortest path algorithm for computing subgame-perfect Nash equilibria