Richard Delaware Mathematics Genealogy and Erdos Number

My Mathematics Genealogy,
and My Erdös Number

My Mathematics Genealogy
My Erdös Number is 4

GO TO Richard Delaware Curriculum Vitae
GO TO Richard Delaware Home Page

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

Tree 1: By major advisors:

1665 Mencke, Otto
1685 Wichmannshausen, Johann
1713 Hausen, Christian
1739 Kaestner, Abraham
1786 Pfaff, Johann
1799 Gauss, C. F.
1812 Gerling, Christian
1824 Plücker, Julius
1868 Klein, C. Felix
1873 Lindemann, C. L. Ferdinand
1885 Hilbert, David
1911 Steinhaus, Hugo
1921 Rajchman, Aleksander
1923 Zygmund, Antoni
1954 Waterman, Daniel
1966 Solomon, Donald
1973 Foran, James
2000 Delaware, Richard

Tree 2: By major advisors up to Klein,
then again major advisors
above Klein's second advisor, Lipschitz:

1650 Weigel, Erhard
1666 Leibniz, Gottfried
----- Bernoulli, Jacob
1694 Bernoulli, Johann
1726 Euler, Leonhard
----- Lagrange, Joseph L.
----- Poisson, Simeon
1827 Dirichlet, Gustav
1853 Lipschitz, Rudolf

1868 Klein, C. Felix
1873 Lindemann, C. L. Ferdinand
1885 Hilbert, David
1911 Steinhaus, Hugo
1921 Rajchman, Aleksander
1923 Zygmund, Antoni
1954 Waterman, Daniel
1966 Solomon, Donald
1973 Foran, James
2000 Delaware, Richard

Data obtained from The Mathematics Genealogy Project.
[Last updated here: 6 May 2005.]

My Erdös Number is 4

My Links:

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.
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.
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.
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.