Mathematician:Ronald Lewis Graham

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American mathematician famous for his work in the field of Ramsey theory.

Notable for introducing Graham's number, the largest number ever yet encountered in mathematics.

Popularized the concept of the Erdős number.

Husband of Fan Chung Graham, friend and colleague of Paul Erdős.




  • Born: October 31, 1935 in Taft, California.
  • Died: July 6, 2020 in San Diego, California, U.S.

Theorems and Definitions

Definitions of concepts named for Ronald Lewis Graham can be found here.


  • 1989: Steiner trees on a checkerboard (with Martin Gardner and Fan Chung)
  • 1998: Erdős on Graphs: His Legacy of Unsolved Problems (with Fan Chung) (ISBN 1-56881-079-2)