English: A simple diagram to explain Erdős numbers. If Alice collaborates with Paul Erdős on one paper, and with Bob on another, but Bob never collaborates with Erdős himself, then Bob is given an Erdős number of 2, as he is two steps from Erdős.
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Own work with kolourpaint. Uses public domain icons from Open Clip Art
{{Information |Description=A simple diagram to explain Erdős numbers. |Source=Own work with kolourpaint. Uses public domain icons from Open Clip Art |Date=06 November 2006 |Author=user:h2g2bob |Permission= |other_versions= }}