Imagine a library containing 25 billion documents but with no centralized organization and no librarians. In addition, anyone may add a document at any time without telling anyone. You may feel sure that one of the documents contained in the collection has a piece of information that is vitally important to you, and, being impatient like most of us, you'd like to find it in a matter of seconds. How would you go about doing it?
http://www.ams.org/featurecolumn/archive/pagerank.htmlThis is the true math behind of PageRank. On "roots" are the old specification of PR ... but hard modified ...
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