List of people by Erdős number
Paul Erdős was one of the most prolific writers of mathematical papers. He often collaborated, having 511 joint authors, a number of whom also have many collaborators. The Erdős number measures the "collaborative distance" between an author and Erdős. Thus, his direct co-authors have Erdős number one, theirs have number two, and so forth. Erdős himself has Erdős number zero.
Tens of thousands of researchers have Erdős numbers of three or less; this list is intended to include only those who are notable in their own right and have existing articles. For more complete listings of Erdős numbers, see the databases maintained by the Erdős Number Project or the collaboration distance calculator maintained by the American Mathematical Society.