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Ronald (Ron) Lewis Graham (born October 31, 1935) is a mathematician credited by the American Mathematical Society as being "one of the principal architects of the rapid development worldwide of discrete mathematics in recent years". He has done important work in scheduling theory, computational geometry, Ramsey theory, and quasi-randomness. He is currently the Chief Scientist at the California Institute for Telecommunications and Information Technology (also known as Cal-(IT)2) and the Irwin and Joan Jacobs Professor in Computer Science and Engineering at the University of California, San Diego (UCSD). ==Biography== Graham was born in Taft, California. In 1962, he received his Ph.D. in mathematics from the University of California, Berkeley and began working at Bell Labs and later AT&T Labs.〔(【引用サイトリンク】author=Larry Rabiner )〕 He retired from AT&T in 1999 after 37 years. His 1977 paper considered a problem in Ramsey theory, and gave a "large number" as an upper bound for its solution. This number has since become well known as the largest number ever used in a mathematical proof (was listed as such in the ''Guinness Book of Records''), and is now known as Graham's number, although it has since then been surpassed by even larger numbers such as TREE(3). Graham popularized the concept of the Erdős number, named after the highly prolific Hungarian mathematician Paul Erdős (1913–1996). A scientist's Erdős number is the minimum number of coauthored publications away from a publication with Erdős. Graham's Erdős number is 1. He co-authored almost 30 papers with Erdős, and was also a good friend. Erdős often stayed with Graham, and allowed him to look after his mathematical papers and even his income. Graham and Erdős visited the young mathematician Jon Folkman when he was hospitalized with brain cancer.〔.〕 Between 1993 and 1994 Graham served as the president of the American Mathematical Society. Graham was also featured in ''Ripley's Believe It or Not'' for being not only "one of the world's foremost mathematicians", but also "a highly skilled trampolinist and juggler", and past president of the International Jugglers' Association. He has published about 320 papers and five books, including ''Concrete Mathematics'' with Donald Knuth and Oren Patashnik. He is married to Fan Chung Graham (known professionally as Fan Chung), who is the Akamai Professor in Internet Mathematics at the University of California, San Diego. He has four children: daughters Ché, Laura and Christy, and a son Marc. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ronald Graham」の詳細全文を読む スポンサード リンク
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