Sang-hyun Kim

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A personal page of Sang-hyun Kim.




Interest Geometric group theory: right-angled Artin group, hyperbolic group, mapping class group, diffeomorphism group, acute triangulations.
MSC2000 20F65 Geometric group theory; 57M60 Group actions in low dimensions; 20F36 Braid groups; Artin groups; 37C85 Dynamics of group actions other than Z and R, and foliation.
  1. (With Thomas Koberda) Diffeomorphism groups of critical regularity, Inventiones mathematicae, accepted.
  2. (With Thomas Koberda and Yash Lodha), Chain groups of homeomorphisms of the interval and the circle, Annales Scientifiques de l'École Normale Supérieure, Series (2019)
  3. (With Hyungryul Baik and Thomas Koberda), Unsmoothable group actions on compact one-manifolds, doi: 10.4171/JEMS/886, Journal of European Mathematical Society (2019)
  4. (With Genevieve Walsh), Coxeter groups, hyperbolic cubes, and acute triangulations, Journal of Topology (2016)
  5. (With Sang-il Oum), Hyperbolic Surface subgroups of one-ended doubles of free groups, Journal of Topology (2014)
  6. (With Thomas Koberda), Embedability between right-angled Artin groups, Geometry & Topology (2013)


  • Y-KAST Member (Young Korean Academy of Science and Technology), Feb 26, 2018 - present.
  • Research Excellence Award, College of Natural Sciences, Seoul National University, March 3, 2017.
  • Excellent Paper Award, Korean Mathematical Society, April 23, 2016.
For the work: (With Thomas Koberda), Embedability between right-angled Artin groups, Geometry & Topology 17 (2013) 493--530.
An award first established in September 2015. Based on recommendations by students council, faculty committee and course survey.
  • Creative Teaching Grand Award, KAIST, February 15, 2013.
  • Sang-San Prize for Young Mathematicians, Korean Mathematical Society, October 5, 2012.
  • Excellence Prize, College Mathematics Competition, Korean Mathematical Society, 1994 and 1995.
  • Silver medal, the 34th International Mathematical Olympiad, Turkey, 1993.

Teaching, Positions and Conferences

  • Program Committee, The 15th East Asian School of Geometric Topology, RIMS & Kyoto University, Japan, Feb 10 - 13, 2020. (annual)
  • Managing editor, Journal of Korean Mathematical Society (2019 - )
  • Review Board (RB), National Research Foundation of Korea (2018 - )
  • Article reviews
- Reviewer, MR (Mathematical Reviews)
- Reviewer, zbMATH (Zentralblatt MATH)
  • Educational committees
- Steering Committee, Seoul Science High School (2018 - )
- Korean Mathematical Olympiad (KMO) Committee (2013 - )
Organizing / Scientific Committee, One-dimensional actions of 3-manifold groups, Dijon, France, November 4 - 8, 2019.
Organizing Committee, Combinatorial and algebraic aspects of geometric structures, Chiang Mai University, Thailand, July 18 - 26, 2019.
Scientific Committee, yGGT-2019, Bilbao, Spain, June 30 - July 5, 2019.
Scientific Committee / Organizer, GAGTA-2018, Seoul, Korea (2018)
Scientific Committee, Workshop on Groups, Geometry and Dynamical System (ICM 2018 satellite), Montevideo, Uruguay (2018)
Organizer, IBS Undergraduate Mathematics Festival (2015)
Organizer, East Asian Conference on Algebraic Topology 6 (EACAT-6), Daejeon, Korea (2015)
Organizer, Geometry on Groups and Spaces (ICM 2014 Satellite), Daejeon, Korea (2014)