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File: ErdosNumber A person's Erdös Number, named after the prolific mathematician PaulErdos, is the length of the shortest chain of co-authored, referred papers from the person to Erdös. It follows then that Erdös' own Erdös number is 0, anyone that has co-authored with Erdös has an Erdös number of 1, and so on. ColinWright's Erdös number is 2, having co-authored with RonGraham, who co-authored with Erdös many times. There is also an Erdös Number of the second type, in which only papers with exactly two authors count. This is much more restrictive. Colin's Erdös Number of the second type is three, going via Graham Brightwell, thence BelaBollobas and PaulErdos. You can find out more about this subject from * http://www.oakland.edu/enp/ * http://www.google.com/search?q=erdos+number+project