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School of Mathematics

Choi, Youn-Seo

Professor Emeritus

q-hypergeometric series, Ramanujan's mock theta function

Youn-Seo Choi works on analytic number theory, especially q-series and the subjects related to the Jacobian theta functions. He has tried to understand and prove the results connected to Ramanujan's mock theta functions in Ramanujan's Lost Notebook with the theory based on q-hypergeometric series and the combinatorics. He has also studied the theory of the Jacobian's theta functions which can be applied to extend the understanding of the Jacobian elliptic functions and the related topics.

  • March. 1985-Feb. 1989 : Bachelor in Mathemaics, Korea University in Seoul, Korea
  • March 1989-Feb. 1992 : Master in Mathemaics, Korea University in Seoul, Korea
  • Aug. 1992-May. 1999 : Ph.D. in Mathematics, University of Illinois at Urbana-Champaign
  • June. 1999- Feb. 2001 : Research fellow, Korea Institute for Advanced Study
  • March. 2001 - Feb. 2005 : Assistant professor, Korea University
  • March. 2005- June 2005 : Associate professor, Korea University
  • July. 2005 - Present : Professor, Korea Institute for Advanced Study
  • 1999 : The Bateman Prize in Number Theory
  • 2003 : 13th annual best science paper award from KOFST

Publications at KIAS


  • Office: 1230 / TEL) 82-2-958-3724 / FAX) 82-2-958-3786
  • School of Mathematics, Korea Institute for Advanced Study
  • 85 Hoegiro Dongdaemun-gu, Seoul 02455, Republic of Korea.