
Common knowledge is knowledge that is known by everyone or nearly everyone, usually with reference to the community in which the term is used. Common knowledge need not concern one specific subject, e.g., science or history. Rather, common knowledge can be about a broad range of subjects, including science, literature, history, entertainment etc. ...
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http://en.wikipedia.org/wiki/Common_knowledge
[logic] Common knowledge is a special kind of knowledge for a group of agents. There is common knowledge of p in a group of agents G when all the agents in G know p, they all know that they know p, they all know that they all know that they know p, and so on ad infinitum. The concept was first introduced in the philosophical literature by D...
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http://en.wikipedia.org/wiki/Common_knowledge_(logic)

[
n] - something generally known to everyone
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http://www.webdictionary.co.uk/definition.php?query=common%20knowledge
noun something generally known to everyone
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https://www.encyclo.co.uk/local/20974
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