Editing Small-world experiment (section)

===Mathematicians and actors===
Smaller communities, such as mathematicians and actors, have been found to be densely connected by chains of personal or professional associations. Mathematicians have created the [[Erdős number]] to describe their distance from [[Paul Erdős]] based on shared publications. A similar exercise has been carried out for the actor [[Kevin Bacon]] and other actors who appeared in movies together with him &mdash; the latter effort informing the game "[[Six Degrees of Kevin Bacon]]". There is also the combined [[Erdős-Bacon number]], for actor-mathematicians and mathematician-actors. Players of the popular Asian game [[Go (board game)|Go]] describe their distance from the great player [[Honinbo Shusaku]] by counting their [[Shusaku number]], which counts degrees of separation through the games the players have had.<ref>{{cite news|last1=Laird|first1=Roy|title=What's Your "Shusaku Number?" « American Go E-Journal|url=http://www.usgo.org/news/2011/07/whats-your-shusaku-number/|access-date=29 November 2017|work=American Go Association|issue=24 July 2011|url-status=dead|archive-url=https://web.archive.org/web/20181122135113/http://www.usgo.org/news/2011/07/whats-your-shusaku-number/|archive-date=22 November 2018}}</ref>