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Gary Theodore Chartrand (born 1936) is an American-born mathematician who specializes in graph theory. He earned his B. S. from Michigan State University, where he majored in mathematics and minored in physical sciences and foreign languages. Michigan State University also awarded him a Master of Science and a PhD for his work in graph theory in 1964. He has authored several books on the subject and is currently a professor emeritus of mathematics at Western Michigan University.〔(Emeriti Faculty ), Western Michigan Mathematics Dept.〕 ==Biography== Gary Chartrand was born in 1936. He was raised in Sault Ste. Marie, Michigan,〔() Article: How to Define an Irregular Graph〕 and attended J. W. Sexton High School located in Lansing, Michigan. As an undergraduate student, he initially majored in chemical engineering, but switched to mathematics in his junior year, in which he also became a member of the honorary mathematics society Pi Mu Epsilon. Chartrand became the first doctoral student of Edward Nordhaus, and the first doctoral student at Michigan State University to research graph theory. He earned his PhD in 1964 for his dissertation “Graphs and Their Associated Line-Graphs”〔.〕 and has worked at Western Michigan University ever since. He has advised 22 doctoral students so far on their own research in the field of graph theory. Chartrand worked with Frank Harary at the University of Michigan, where he spent a year as a Research Associate, and the two have published numerous papers together (along with other authors). Chartrand has published several books on graph theory. Among Gary Chartrand’s publications are papers he wrote with Paul Erdős and others on the topic of highly irregular graphs.〔() Chartrand, Gary, Paul Erdos, and Ortrud R. Oellermann. "How to define an irregular graph." College Math. J 19.1 (1988): 36–42.〕 Besides his work with Erdős, Chartrand has also published numerous articles on the areas of graph theory which most interest him, which he states are “graph structures, graph colorings, distance in graphs, and domination.”〔(Chartrand's web page ) at Western Michigan University〕 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「Gary Chartrand」の詳細全文を読む スポンサード リンク
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