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| Friday 21 Feb 2014: Erdős number |
| The Erdős number describes a person's distance to the famous Hungarian mathematician Paul Erdős measured via co-authorship of mathematical papers. Anyone who has authored a paper with Paul Erdős has an Erdős number of 1, anyone authoring a paper with someone with an Erdős number of 1 has an Erdős number of 2, etc. There are currently 511 people known with an Erdős number of 1. |