Jun-Ichi Igusa

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Jun-Ichi Igusa
Born(1924-01-30)30 January 1924
Kiyosato village, Gunma Prefecture, Japan
Died25 November 2013(2013-11-25) (aged 89)
Alma materKyoto University
Known forIgusa zeta-function
Scientific career
InstitutionsUniversity of Tsukuba
Harvard University
Johns Hopkins University
Doctoral students

Jun-Ichi Igusa (井草 準一, Igusa Jun’ichi, 30 January 1924 − 25 November 2013)[1] 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.[2]

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


Igusa was born in Kiyosato village, Gunma Prefecture, Japan. 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.

He had three sons, Kiyoshi, Takeru and Mitsuru.[5] 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, 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, 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, 14, Providence, R.I.: American Mathematical Society, ISBN 978-0-8218-2015-5, MR 1743467


  1. ^ Lo, Samuel E. (1971). Asian Who? in America. East-West Who. p. 109.
  2. ^ "Jun-ichi Igusa, Noted Mathematician and Researcher, Died at 89 — Johns Hopkins University". Krieger.jhu.edu. 2013-11-27. Archived from the original on 2013-12-03. Retrieved 2013-11-29.
  3. ^ http://www.mathunion.org/db/ICM/Speakers/SortedByLastname.php
  4. ^ List of Fellows of the American Mathematical Society, retrieved 2013-01-26.
  5. ^ "Archived copy". Archived from the original on 2013-12-03. Retrieved 2013-11-29.CS1 maint: Archived copy as title (link)

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