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Mutual knowledge (logic) : ウィキペディア英語版 | Mutual knowledge (logic) Mutual knowledge is a fundamental concept about information in game theory, (epistemic) logic and epistemology. An event is mutual knowledge if all agents know that the event occurred.〔Osborne, Martin J., and Ariel Rubinstein. ''A Course in Game Theory''. Cambridge, MA: MIT, 1994. Print.〕 However, mutual knowledge by itself implies nothing about what agents know about other agents' knowledge: i.e. it is possible that an event is mutual knowledge but that each agent is unaware that the other agents know it has occurred.〔Peter Vanderschraaf, Giacomo Sillari (2007). ( Common Knowledge ). ''Stanford Encyclopedia of Philosophy''. Accessed 18 November 2011.〕 Common knowledge is a related but stronger notion; any event that is common knowledge is also mutual knowledge. The philosopher Stephen Schiffer, in his book ''Meaning'', developed a notion he called "mutual knowledge" which functions quite similarly to David K. Lewis's "common knowledge".〔Stephen Schiffer, ''Meaning'', 2nd edition, Oxford University Press, 1988. The first edition was published by OUP in 1972. Also, David Lewis, ''Convention'', Cambridge, MA: Harvard University Press, 1969. For a discussion of both Lewis's and Schiffer's notions, see Russell Dale, ''(The Theory of Meaning )'' (1996).〕 ==See also==
* Elephant in the room * The Emperor's New Clothes
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