Overview

common knowledge


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Any proposition (1) that every member of a specified group knows to be true, knows that every other member knows to be true, knows that every other member knows that every other member knows to be true, and so on. It is not the same as all members of the group merely knowing the proposition to be true, as shown in the muddy children problem. The concept was introduced in 1969 by the US philosopher David K(ellogg) Lewis (1941–2001) in his book Convention: A Philosophical Study (pp. 52–68).

Subjects: Psychology.


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