Sun, Hae-Sang

Associate Professor

Nat. Sci. Bldg(108) 301-13
Dept. of Math. Sciences, UNIST
UNIST-gil 50, Ulsan 44919

Contact Information
+82-52-217-3140 (office)
+82-52-217-2219 (fax)

Education and Employment

  • 2007 June, Ph. D. in Mathematics at University of California, Los Angeles
  • 2007~2008, Postdoctoral Fellow, Max-Planck-Institut fuer Mathematik, Bonn
  • 2008~2010, Research Fellow, Korea Institute for Advanced Study, Seoul
  • 2010~2014, Associate Professor, Chungbuk National University, Cheongju


  • Fall 2018 (Office Hour : Mon 14:00~16:00 or by appointment)
    • Modern Algebra II
  • Spring 2018
    • Modern Algebra I
    • Set Theory
  • Fall 2017
    • Graduate Algebra II
  • Spring 2017
    • Set Theory
    • Graduate Algebra I


  • Generation of cyclotomic Hecke fields by modular L-values with cyclotomic twists, AJM, accepted.
  • (with Jungwon Lee) Another note on "Euclidean algorithms are Gaussian" by V. Baladi and B. Vallée, Acta. Arith, to appear.
  • (with Koh, Doowon) Distance sets of two subsets of vector spaces over finite fields, Proc. Amer. Math. Soc. 143 (2015), no. 4, 1679--1692.
  • The special values of Dirichlet L-functions as an analogue of the Iwasawa power series, J. Reine Angew. Math. 687 (2014), 207--223.
  • A study on functional independence of the Iwasawa power series, Adv. Math. 238 (2013), 119--139.
  • Cuspidal class number of the tower of modular curves $X_1(Np^n)$, Math. Ann. 348 (2010), no. 4, 909--927.
  • Borel's conjecture and the transcendence of the Iwasawa power series, Proc. Amer. Math. Soc. 138 (2010), no. 6, 1955--1963.
  • Derivative of power series attached to $\Gamma$-transform of $p$-adic measures, J. Number Theory 130 (2010), no. 1, 10--26.
  • Homological interpretation of a theorem of L. Washington, J. Number Theory 127 (2007), no. 1, 47--63.

Preprints and Work in progress

  • (with Byungheup Jun and Jungyun Lee) Number fields generated by Hecke L-values of totally real fields, in preparation.
  • (with Myoungil Kim) Modular symbols and modular L-values with cyclotomic twists, submitted.
  • (with Ashay Burungale) Quantitative non-vanishing mod p of Dirichlet L-values, submitted.
  • (with Chan-Ho Kim and Myoungil Kim) On the indivisibility of derived Kato's Euler systems and the main conjecture for modular forms, submitted.
  • (with Jungwon Lee) Dynamics of continued fractions and distribution of modular symbols, in preparation.
  • (with Jaesung Kwon) Special L-values of cusp forms on GL(2) over imaginary quadratic fields, in preparation.

Graduate Students