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A person's 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. The lower the number, the closer a person is to Erdős and Bacon, which reflects a small world phenomenon in academia and entertainment. In general, to have a defined Erdős–Bacon number, it is a necessary (but not a sufficient) condition for one to have both appeared in a film and co-authored an academic paper. It is not sufficient because it may still be impossible to reach Erdős through one's academic coauthors or Bacon through one's film co-appearances. ==Scientists== Astronomer Carl Sagan has an Erdős number of no more than 4〔(【引用サイトリンク】 title=The Erdős Number Project, Paths to Erdős ) 〕 via Steven J. Ostro and a Bacon number of 2,〔(【引用サイトリンク】 The Oracle of Bacon at Virginia )〕 for a total of 6. Physicist Richard Feynman has an Erdős number of 3 and a Bacon number of 3, having appeared in the film ''Anti-Clock'' alongside Tony Tang.〔(【引用サイトリンク】 The Oracle of Bacon at Virginia )〕 Geneticist Jonathan Pritchard appeared in the 1998 movie ''Without Limits''〔 as David Bedford, the English distance runner, in the 1972 Munich Olympics〕 which gives him a Bacon Number of 2.〔 with Donald Southerland who portrayed Bill Bowerman in Without Limits and Kevin Bacon〕 Pritchard has an Erdős Number of 4 thus giving him an Erdős–Bacon Number of 6. Scientist and artist Ken Goldberg has an Erdős–Bacon number of 6.〔http://goldberg.berkeley.edu/bio.html〕 Goldberg co-wrote Connected: An Autoblogography About Love, Death & Technology and Peter Coyote was also in it. Coyote was in These Amazing Shadows with Zooey Deschanel. Deschanel was in Sundance Skippy with Kevin Bacon. This gives a Bacon number of 3. Computer scientist and mathematician Hubie Chen has an Erdős–Bacon number of 5: he has an Erdős number of 3 via Manuel Bodirsky, and has a Bacon number of 2 via Rebecca Hall. Mathematician Allan "Dan" Muir (at City University London from 1966 to 1990) has an Erdős–Bacon number of 7: using the name Allan Muir he has an Erdős number of 4 via Nicholas C. Yannelis, Karel Pickry and Kenneth Kunen and appeared as the Cresecent and Red Dog Knights in the film ''Jabberwocky'' using the name Dan Muir giving him a Bacon number of 3. Theoretical physicist Stephen Hawking has an Erdős–Bacon number of 7: His Bacon number of 3 (via his appearance alongside Patrick Stewart in an episode of ''Star Trek: The Next Generation'') is lower than his Erdős number of 4. MIT Professor of Applied Mathematics Daniel Kleitman has an Erdős–Bacon number of 3, having co-authored a paper with Erdős and appeared as an extra and consultant on ''Good Will Hunting'' alongside Minnie Driver who appeared with Bacon in ''Sleepers''.〔http://www.oakland.edu/enp/related/〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Erdős–Bacon number」の詳細全文を読む スポンサード リンク
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