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Logique épistémique et théorie des jeux

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  • Bernard Walliser

Abstract

[eng] Epistemic logic and game theory. . Epistemic logic and game theory study agents knowledge as constituted of either propositions or events, but their frameworks are nevertheless strongly related. If the second allows probabilized knowledge, the first one allows weakened knowledge, each original dimension of one being now integrated by the other. Each approach is able to formalize the multilevel crossed knowledge between agents and stresses the fundamental concept of common knowledge. Both express that a knowledge structure is more infor-mative than another and describe the updating of knowledge when new information is available. But game theory is until now the only one which considers action rules for the agents in order to study the effects of knowledge on individual behavior and global equilibria. [fre] Logique épistémique et théorie des jeux. . La logique épistémique et la théorie des jeux étudient les connaissances des agents en les faisant porter respectivement sur des propositions et sur des événements, mais leurs cadres d'analyse peuvent être mis en correspondance. Si la seconde permet de formaliser des connaissances probabilisées, la première permet d'axiomatiser des connaissances affaiblies, chaque dimension originale de l'une étant actuellement intégrée par l'autre. Les deux approches rendent compte de l'idée de connaissances croisées à niveaux multiples entre acteurs, et donnent corps à la notion devenue centrale de connaissance commune. L'une et l'autre permettent d'exprimer qu'une structure de connaissance est plus informative qu'une autre et de décrire la révision d'une telle structure en cas d'information nouvelle. La théorie des jeux est toutefois seule à associer aux règles de connaissance des principes d'action et à étudier l'influence des connaissances sur les comportements individuels et les équilibres globaux.

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  • Bernard Walliser, 1991. "Logique épistémique et théorie des jeux," Revue Économique, Programme National Persée, vol. 42(5), pages 801-832.
    • Handle: RePEc:prs:reveco:reco_0035-2764_1991_num_42_5_409311
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