Ronald Graham
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Ronald Lewis Graham was an American mathematician credited by the American Mathematical Society as "one of the principal architects of the rapid development worldwide of discrete mathematics in recent
Graham in 1998
Ronald Graham, his wife Fan Chung, and Paul Erdős, Japan 1986
Ronald Graham juggling a four-ball fountain (1986)
Erdős number
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The Erdős number describes the "collaborative distance" between mathematician Paul Erdős and another person, measured by joint authorship of mathematical papers. The same principle has been applied in
Ronald Graham
…determined to improve his game, and eventually became Bell Labs champion and won a state title in the game. Graham later popularized the concept of the Erdős number, a measure of distance from Erdős in the collaboration network of mathematicians; his many works with Erdős include two books of open problems[B1][B5…
Paul Erdős in 1992
Paul Erdős in 1985 at the University of Adelaide teaching Terence Tao, who was then 10 years old.