School of Mathematics
Choi, YounSeo
Professor Emeritus
qhypergeometric series, Ramanujan's mock theta function
YounSeo Choi works on analytic number theory, especially qseries 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 qhypergeometric 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. 1985Feb. 1989 : Bachelor in Mathemaics, Korea University in Seoul, Korea
 March 1989Feb. 1992 : Master in Mathemaics, Korea University in Seoul, Korea
 Aug. 1992May. 1999 : Ph.D. in Mathematics, University of Illinois at UrbanaChampaign
 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

Overpartitions into distinct parts without short sequences
JOURNAL OF NUMBER THEORY, 2017 
MODULAR TRANSFORMATIONS INVOLVING THE MORDELL INTEGRAL IN RAMANUJAN'S LOST NOTEBOOK
PACIFIC JOURNAL OF MATHEMATICS, 2014 
Cubic analogues of the Jacobian theta functions and the Jacobian elliptic functions
JOURNAL OF NUMBER THEORY, 2013 
Partition identities from third and sixth order mock theta functions
EUROPEAN JOURNAL OF COMBINATORICS, 2012 
The basic bilateral hypergeometric series and the mock theta functions
RAMANUJAN JOURNAL, 2011 
Tenth order mock theta functions in Ramanujan's lost notebook III
PROCEEDINGS OF THE LONDON MATHEMATICAL SOCIETY, 2007 
Tenth order mock theta functions in Ramanujan's lost notebook II
ADVANCES IN MATHEMATICS, 2000
Selected Publications

Overpartitions into distinct parts without short sequences
JOURNAL OF NUMBER THEORY v.175, 117133p. 2017 
MODULAR TRANSFORMATIONS INVOLVING THE MORDELL INTEGRAL IN RAMANUJAN'S LOST
PACIFIC JOURNAL OF MATHEMATICS, v.272, no.1 (2014), 5985 
Cubic analogues of the Jacobian theta functions and the Jacobian elliptic functions
JOURNAL OF NUMBER THEORY, v.133, no.6 (2013), 18871906 
Partition identities from third and sixth order mock theta functions
EUROPEAN JOURNAL OF COMBINATORICS, v.33, no.8 (2012), 17391754 
The Basic Bilateral Hypergeometric Series and the Mock Theta Functions
Ramanujan Journal, 24 (2011), no. 3, 345386 
Ramanujan's forty identities for the RogersRamanujan functions
Memoirs of the A.M.S., vol 188, #880, (2007) 
Tenth order mock theta functions in Ramanujan's lost notebook
Proceedings of the London Mathematical Society, (1) 94 (2007) 2652 
Mock Theta functions in Ramanujan's Lost Notebook (Survey)
RIMS 1512analytic number theory, (2006) 4453 
Generalization of two identities in Ramanujan's lost notebook
Acta Arith. 114 (2004), no. 4, 369389 
Identities for Ramanujan's sixthorder mock theta functions
Q. J. Math. 53 (2002), no. 2, 147159 
Tenth order mock theta functions in Ramanujan's lost notebook. IV.
Trans. Amer. Math. Soc. 354 (2002), no. 2, 705733 
Tenth order mock theta functions in Ramanujan's lost notebook. II.
Adv. Math. 156 (2000), no. 2, 180285 
The problems submitted by Ramanujan to the Journal of the Indian Mathematical Society.
(Columbia, MO, 1998), 1556, Contemp. Math., 236, Amer. Math. Soc., Providence, RI, 1999 
Tenth order mock theta functions in Ramanujan's lost notebook
Invent. Math. 136 (1999), no. 3, 497569
 Office: 1230 / TEL) 8229583724 / FAX) 8229583786
 School of Mathematics, Korea Institute for Advanced Study
 85 Hoegiro Dongdaemungu, Seoul 02455, Republic of Korea.