On 11/30/06, charles.r.matthews(a)ntlworld.com
Trouble is: I have checked that my own Erdos number is
at most 4. Knowing that it is exactly 4, rather than 3, is equivalent to knowing a huge
amount about collaborative papers ... which is a needle-in-haystack search.
No, it's really easy actually. Go to Wikipedia and check out
[[Category:Erdos number 2]]. If you've worked on a paper with any of
the people in it, you're 3. Otherwise, you're 4.
:p
Steve