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Encyclopedic overview
Paul Erdős in 1992
The Erdős number ( Hungarian: [ˈɛrdøːʃ]) describes the "collaborative distance" between mathematician Paul Erdős and another person, measured by joint authorship of mathematical papers. The same principle has been applied in other fields.
Excerpted from Wikipedia’s “Erdős number” article, available under the CC BY-SA 4.0 licence.