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The Erdős number, honouring the late Hungarian mathematician Paul Erdős /εrdøː∫/, one of the most prolific writers of mathematical papers, is a way of describing the "collaborative distance", in regard to mathematical papers, between an author and Erdős. An author's Erdős number is defined inductively as follows:
  • Paul Erdős has an Erdős number of zero.
  • The Erdős number of author M is one plus the minimum among the Erdős numbers of all the authors with whom M coauthored a mathematical paper.
My Erdős number is 3 (upper bound). The track is as follows:
  1. Paul Erdős
  2. Andrew M. Odlyzko
  3. Leonidas J. Guibas
  4. Michael M. Bronstein