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Sigurdur Helgason (born 1927) is an Icelandic-American mathematician whose research has been devoted to the geometry and analysis on symmetric spaces. In particular he has used new integral geometric methods to establish fundamental existence theorems for differential equations on symmetric spaces as well as some new results on the representations of their isometry groups. He also introduced a Fourier transform on these spaces and proved the principal theorems for this transform, the inversion formula, the Plancherel theorem and the analog of the Paley-Wiener theorem. He was born in Akureyri, Iceland. In 1954 he earned a PhD from Princeton University under Salomon Bochner. Since 1965, Helgason has been a professor of mathematics at the Massachusetts Institute of Technology. He was winner of the 1988 Leroy P. Steele Prize for Seminal Contributions for his books ''Groups and Geometric Analysis'' and ''Differential Geometry, Lie Groups and Symmetric Spaces''. This was followed by the 2008 book ''Geometric Analysis on Symmetric Spaces''. He has been a fellow of the American Academy of Arts and Sciences since 1970. In 2012 he became a fellow of the American Mathematical Society.〔(List of Fellows of the American Mathematical Society ), retrieved 2013-01-21.〕 == Selected works == 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「Sigurdur Helgason (mathematician)」の詳細全文を読む スポンサード リンク
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