Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A person's Erdos–Bacon number is a concept which reflects the small world phenomenon in academia and entertainment. It is the sum of one's Erdos number—which measures the "collaborative distance" in authoring mathematical papers between that person and Hungarian mathematician Paul Erdos—and one's Bacon number—which represents the number of links, through roles in films, by which the individual is separated from American actor Kevin Bacon. The lower the number, the closer a person is to Erdos and Bacon. The idea of Erdos–Bacon numbers has been written about by Simon Singh in the British media and Benjamin Rosenbaum, among others, in the blogosphere. However, the idea had appeared in print before, notably in 1998, when it was mentioned in response to Daniel Kleitman appearing in Good Will Hunting.

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