Frank Stephan's Erdoes-Number is Three
Thanks to Bill Gasarch for finding this number. Paul Erdoes is one of the most productive mathematicians having more than 500 coaouthors. The Erdoes Number of a person A is computed as the length of the shortest path from Paul Erdoes to the person A with respect to the graph of co-authors of scientific articles. Frank Stephan's Erdoes number is 3 and witnessed by the following publications.

• Erdoes, Paul; Shelah, Saharon: Separability properties of almost-disjoint families of sets. Israel Journal of Mathematics 12, 207-214 (1972).
  
• Abraham, Uri; Shelah, Saharon; Solovay, Robert: Squares with diamonds and Souslin trees with special squares. Fundamenta Mathematicae 127, 133-162 (1987).
  
• Fortnow, Lance; Gasarch, William; Jain, Sanjay; Kinber, Efim; Kummer, Martin; Kurtz, Stuart; Pleszkovich, Mark; Slaman, Theodore; Solovay, Robert; Stephan, Frank: Extremes in the degrees of inferability. Annals of Pure and Applied Logic 66, 231-276 (1994).

Frank Stephan's Coauthors

1. Klaus Ambos-Spies
   
2. Ganesh R. Baliga
   
3. Richard Beigel
   
4. Levke Bentzien
   
5. Bernd Borchert
   
6. Heinz Braun
   
7. John Case
   
8. Rod Downey
   
9. Peter Fejer
   
10. Henning Fernau
    
11. Lance Fortnow
    
12. Rusins Freivalds
    
13. William Gasarch
    
14. Valentina Harizanov
    
15. Denis R. Hirschfeldt
    
16. Kejia Joyce Ho
    
17. Sanjay Jain
    
18. Carl Jockusch
    
19. Susanne Kaufmann
    
20. Bakhadyr Khoussainov
    
21. Efim Kinber
    
22. Martin Kummer
    
23. Stuart A. Kurtz
    
24. Dietrich Kuske
    
25. Klaus-Joern Lange
    
26. Eric Martin
    
27. Georgia Martin
    
28. Timothy McNicholl
    
29. Andrew Mitchell
    
30. Wolfram Menzel
    
31. Wolfgang Merkle
    
32. Andre Nies
    
33. Matthias Ott
    
34. Mark Pleszkoch
    
35. Desh Ranjan
    
36. Jan Reimann
    
37. Ruediger Reischuk
    
38. Sasha Rubin
    
39. Marcus Schaefer
    
40. Tobias Scheffer
    
41. Arun Sharma
    
42. Ted Slaman
    
43. Carl Smith
    
44. Robert Solovay
    
45. Denis Therien
46. Sebastiaan Terwijn
    
47. Pascal Tesson
    
48. Mahendran Velauthapillai
    
49. Yuri Ventsov
    
50. Rolf Wiehagen
    
51. Thomas Zeugmann