Richard Delaware

My Mathematics Genealogy,
and My Erdös Number

  1. My Mathematics Genealogy
  2. My Erdös Number is 4

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Mathematics Genealogy Trees

The year listed is the year the Ph.D. was awarded.

Tree 1: By major advisors:
  1. 1665 Mencke, Otto
  2. 1685 Wichmannshausen, Johann
  3. 1713 Hausen, Christian
  4. 1739 Kaestner, Abraham
  5. 1786 Pfaff, Johann
  6. 1799 Gauss, C. F.
  7. 1812 Gerling, Christian
  8. 1824 Plücker, Julius
  9. 1868 Klein, C. Felix
  10. 1873 Lindemann, C. L. Ferdinand
  11. 1885 Hilbert, David
  12. 1911 Steinhaus, Hugo
  13. 1921 Rajchman, Aleksander
  14. 1923 Zygmund, Antoni
  15. 1954 Waterman, Daniel
  16. 1966 Solomon, Donald
  17. 1973 Foran, James
  18. 2000 Delaware, Richard


Tree 2: By major advisors up to Klein,
then again major advisors
above Klein's second advisor, Lipschitz:
  1. 1650 Weigel, Erhard
  2. 1666 Leibniz, Gottfried
  3. ----- Bernoulli, Jacob
  4. 1694 Bernoulli, Johann
  5. 1726 Euler, Leonhard
  6. ----- Lagrange, Joseph L.
  7. ----- Poisson, Simeon
  8. 1827 Dirichlet, Gustav
  9. 1853 Lipschitz, Rudolf

  10. 1868 Klein, C. Felix
  11. 1873 Lindemann, C. L. Ferdinand
  12. 1885 Hilbert, David
  13. 1911 Steinhaus, Hugo
  14. 1921 Rajchman, Aleksander
  15. 1923 Zygmund, Antoni
  16. 1954 Waterman, Daniel
  17. 1966 Solomon, Donald
  18. 1973 Foran, James
  19. 2000 Delaware, Richard
Data obtained from The Mathematics Genealogy Project.
[Last updated here: 6 May 2005.]


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My Erdös Number is 4

My Links:
  1. 2001 (only link)
    R. Delaware and L. Eifler
    Graphs of Functions, Regular Sets and s-Straight Sets
    Real Analysis Exchange, 26(2), 2000/2001, pp. 885-892, MR 1844402.

  2. 1971 (only link)
    L. Q. Eifler, K. B. Reid, and D. P. Roselle
    Sequences with Adjacent Elements Unequal
    Aequationes Mathematicae, 6, 1971, pp. 256-262, MR 0295921.

  3. 1975 (earliest of 4 links)
    Marcel Herzog and K. B. Reid
    Numbers of Factors in k-Cycle Decompositions of Permutations
    Combinatorial Mathematics, IV (Proceedings of the Fourth Australian Conference, Univ. Adelaide, 1975), pp. 123-131;
    Lecture Notes in Mathematics, 560, Springer, Berlin, 1976, MR 0419572.

  4. 1970 (earliest link)
    Paul Erdös and Marcel Herzog
    An Extremal Problem on the Set of Noncoprime Divisors of a Number
    Israel Journal of Mathematics, 8, 1970, pp. 408-412, MR 0274413.


The Distribution of Erdös Numbers [updated 6 May 2005]

Erdös number 0 --- 1 person (Erdös himself!)
Erdös number 1 --- 504 people
Erdös number 2 --- 6593 people
Erdös number 3 --- 33605 people
Erdös number 4 --- 83642 people
Erdös number 5 --- 87760 people
Erdös number 6 --- 40014 people
Erdös number 7 --- 11591 people
Erdös number 8 --- 3146 people
Erdös number 9 --- 819 people
Erdös number 10 -- 244 people
Erdös number 11 -- 68 people
Erdös number 12 -- 23 people
Erdös number 13 -- 5 people
Erdös number 14 -- 0 people

Data obtained from The Erdös Number Project, and MathSciNet.

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