Michael Goodrich's Erdős Number.

A person's Erdős number is the degrees of separation from that person to the famous mathematician Paul Erdős through research publications. That is, the distance, in number of collaborations, from that person to Erdős. In fact, we can define a collaboration graph, where we create a vertex for each person and link two people with an edge if they have collaborated on a published research paper.

Michael Goodrich's Erdős number is 3, which is realized in the following (disjoint) ways in the collaboration graph:

1. Erdős->Avis->Snoeyink->Goodrich
2. Erdős->Pach->Bronnimann->Goodrich
3. Erdős->Pollack->Agarwal->Goodrich
4. Erdős->Alon->Vishkin->Goodrich
5. Erdős->Aronov->Kosaraju->Goodrich
6. Erdős->Wagstaff->Atallah->Goodrich
7. Erdős->Silverman->Mount->Goodrich
8. Erdős->Fraenkel->Scheinerman->Goodrich
9. Erdős->Odlyzko->Guibas->Goodrich
10. Erdős->Yao->Eppstein->Goodrich
11. Erdős->Fishburn->Tanenbaum->Goodrich
12. Erdős->Graham->Varghese->Goodrich