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Erdős–Bacon number - Wikipedia, the free encyclopedia - http://en.wikipedia.org/wiki/Erdős–Bacon_number

"Erdős–Bacon number is the sum of one's Erdős number—which measures the "collaborative distance" in authoring mathematical papers between that person and Hungarian mathematician Paul Erdős—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" · Alex Kapranoff

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