Jun-Ichi Igusa

Jun-ichi Igusa (井草 凖一, Igusa Jun’ichi, 30 January 1924 – 24 November 2013) was a Japanese mathematician who for over three decades was on the faculty at Johns Hopkins University. He is known for his contributions to algebraic geometry and number theory. The Igusa zeta-function, the Igusa quartic, Igusa subgroups, Igusa curves, and Igusa varieties are named after him.^[1]

He was an invited speaker for the 1962 International Congress of Mathematicians in Stockholm.^[2] He was awarded Japan's Order of the Sacred Treasure.^[3] In 2012 he became a fellow of the American Mathematical Society.^[4]

Igusa was born in Kiyosato village, Gunma Prefecture, Japan, on 30 January 1924.^[5] He graduated from the University of Tokyo in 1945 and received his Ph.D. from Kyoto University in 1953, after which he became professor of mathematics at the University of Tsukuba. After a brief period spent at Harvard University, he took up a permanent position at Johns Hopkins University, in Baltimore. Igusa taught at Johns Hopkins from 1955 to 1993.^[6] He joined the staff of the American Journal of Mathematics as an associate editor in 1964, and served as chief editor between 1978 and 1993.^[7] Igusa died, aged 89, of a stroke at Holly Hill Nursing Home in Towson, Maryland, on 24 November 2013.^[6]

He had three sons, Kiyoshi, Takeru and Mitsuru.^[1] Takeru Igusa is a professor of civil engineering at Johns Hopkins University. Kiyoshi Igusa is a professor of mathematics at Brandeis University.

• Igusa, Jun-ichi (1972), Theta functions, Die Grundlehren der mathematischen Wissenschaften, vol. 194, Berlin, New York: Springer-Verlag, ISBN 978-3-540-05699-7, MR 0325625
• Igusa, Jun-ichi (1978), Forms of higher degree (PDF), Tata Institute of Fundamental Research Lectures on Mathematics and Physics, vol. 59, Bombay: Tata Institute of Fundamental Research, ISBN 978-0-387-08944-7, MR 0546292
• Igusa, Jun-ichi (2000), An introduction to the theory of local zeta functions, AMS/IP Studies in Advanced Mathematics, vol. 14, Providence, R.I.: American Mathematical Society, ISBN 978-0-8218-2015-5, MR 1743467

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