On Jan 6, 2007, at 3:02 PM, Roger Hui wrote:
I have Erdos number 2, and Charles is the only
other Erdos 2 holder that I know.
Eugene, don't you know me? Also, someone who lives
in your neighborhood also is Erdos 2. He goes by
the name Donald Knuth.
http://en.wikipedia.org/wiki/Category:Erd%C5%91s_number_2
I had in mind the collaboration graph, the one that Erdos himself
seemed to favor, which would put an edge between two vertices if two
co-authors have a joint paper by themselves, with no other authors.
This is the Erdos number of the second kind, so my Erdos number 2 is
of the second kind: eemcd with Jeff Shallit, and Jeff Shallit with
Erdos. See my article in Vector 17.4, April 2001.
Eugene
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