Common belief and common knowledge
نویسندگان
چکیده
But game theory as we presently know it can not proceed without the fulcrum of common knowledge. Robert Wilson (1985) In the universal belief space [Mertens and Zamir (1985)] which incorporated all situations of incomplete information concerning a state space S , we de ne a `knowledge operator' in terms of beliefs. From this operator we derive (in the usual way) the concept of common knowledge and the result is: An event E is common knowledge if and only if it is a belief subspace. Recalling that any game model, with complete or incomplete information, is a belief subspace, this result may be regarded as a considerable weakening of the common knowledge assumption that is: If we adopt the universal belief space as a general framework model for incomplete information games, then the statement `the game (i.e. the belief subspace) is Common Knowledge' is a formal provable statement within the model. Since a belief subspace may or may not be consistent (in Harsanyi's sense), it follows that with this de nition, and unlike in Aumann's model, players may agree to disagree.
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