A friend e-mailed me his Erdös number,* which was 7 but turned out to be 5 (given that discussion papers counts). My number is 7 without discussion papers (Erdös -> Davies -> Schuss -> Mangel -> Plant -> McKelvey -> Sandal -> Me) or 5 with discussion papers (Erdös -> Linial -> Katznelson -> Radner -> Groves -> Me). You can find your own number on The Erdös Number Project page.

* From The Erdös Number Project: Paul Erdös (1913–1996), the widely-traveled and incredibly prolific Hungarian mathematician of the highest caliber, wrote hundreds of mathematical research papers in many different areas, many in collaboration with others. […] Erdös’s Erdös number is 0. Erdös’s coauthors have Erdös number 1. People other than Erdös who have written a joint paper with someone with Erdös number 1 but not with Erdös have Erdös number 2, and so on. If there is no chain of coauthorships connecting someone with Erdös, then that person’s Erdös number is said to be infinite.

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Tags: Erdös Number, Paul Erdös, The Erdös Number Project

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