Abstract
The Erdős number (EN) for collaborative papers among mathematicians was defined as indicating the topological distance in the graph depicting the co-authorship relations, i. e., EN = 1 for all co-authors of Paul Erdős; EN = 2 for their co-authors who did not publish jointly with Erdős; etc. A refinement of this notion uses resistance distances leading to rational Erdős numbers (REN), which (as indicated by their name) are rational numbers. For acyclic graphs, EN = REN, but for graphs with circuits these numbers differ. Further refinements are possible using weighted edges in the co-authorship graph according to the number of jointly authored papers.
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Balaban, A.T., Klein, D.J. Co-authorship, rational Erdős numbers, and resistance distances in graphs. Scientometrics 55, 59–70 (2002). https://doi.org/10.1023/A:1016098803527
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DOI: https://doi.org/10.1023/A:1016098803527