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.

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

Frank Stephan's Coauthors

1. Bahareh Afshari
   
2. Manindra Agrawal
   
3. Klaus Ambos-Spies
   
4. Jose L. Balcazar
   
5. Ganesh R. Baliga
   
6. George Barmpalias
   
7. Richard Beigel
   
8. Laurent Bienvenue
   
9. Levke Bentzien
   
10. Bernd Borchert
    
11. Heinz Braun
    
12. Harry Buhrman
    
13. Lorenzo Carlucci
    
14. John Case
    
15. Barry Cooper
    
16. Cristian Calude
    
17. David Doty
    
18. Rod Downey
    
19. Peter Fejer
    
20. Santiago Figueira
    
21. Henning Fernau
    
22. Lance Fortnow
    
23. Johanna Franklin
    
24. Rusins Freivalds
    
25. William Gasarch
    
26. Piotr Grabowski
    
27. Valentina Harizanov
    
28. Denis R. Hirschfeldt
    
29. Kejia Joyce Ho
    
30. Sanjay Jain
    
31. Carl Jockusch
    
32. Susanne Kaufmann
    
33. Bakhadyr Khoussainov
    
34. Efim Kinber
    
35. Bjoern Kjos-Hanssen
    
36. Martin Kummer
    
37. Stuart A. Kurtz
    
38. Dietrich Kuske
    
39. Klaus-Joern Lange
    
40. Andrew Lewis
    
41. Philip Long
    
42. Luc Longpre
    
43. Eric Martin
    
44. Georgia Martin
    
45. Timothy McNicholl
    
46. Wolfram Menzel
    
47. Wolfgang Merkle
    
48. Andrew Mitchell
    
49. Joseph S.~Miller
    
50. Andrej A. Muchnik
    
51. Carl Mummert
    
52. Jochen Nessel
    
53. Phuong The Nguyen
    
54. Andre Nies
    
55. Matthias Ott
    
56. Mark Pleszkoch
    
57. Alexander Raichev
    
58. Desh Ranjan
    
59. Jan Reimann
    
60. Ruediger Reischuk
    
61. Sasha Rubin
    
62. Marcus Schaefer
    
63. Tobias Scheffer
    
64. Pavel Semukhin
    
65. Arun Sharma
    
66. Ted Slaman
    
67. Carl Smith
    
68. Robert Solovay
    
69. Ludwig Staiger
    
70. Sebastiaan Terwijn
    
71. Jason Teutsch
    
72. Pascal Tesson
    
73. Denis Therien
74. P.S. Thiagarajan
    
75. Leen Torenvliet
    
76. Mahendran Velauthapillai
    
77. Yuri Ventsov
    
78. Rolf Wiehagen
    
79. Guohua Wu
    
80. Shaofa Yang
    
81. Yue Yang
    
82. Liang Yu
    
83. Thomas Zeugmann