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Erdős number
A low Erdős number is a status symbol among 20th century mathematicians and is similar to the 6degreesofseparation concept.
Let $e(p)$ be the Erdős number of person $p$. Your Erdős number is

0 if you are Paul Erdős

$\min\{e(x)x\in X\}+1$, where $X$ is the set of all persons you have authored a paper with.
Related:
ErdHosNumber
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