Robert Tang

Robert Tang

Since September 2020, I am a lecturer (assistant professor) in pure mathematics at Xi’an Jiaotong-Liverpool University.

PhD Mathematics 2013, University of Warwick
BSc (Honours) 2008, University of Sydney

Research interests: Low-dimensional topology, geometric group theory, hyperbolic geometry, Teichmueller theory, dynamical systems

Email: robert (dot) tang (at) xjtlu (dot) edu (dot) cn



I am an organiser of the Geometric Group Theory in East Asia (GGTea) seminar.

Previous positions

  • Postdoctoral Scholar, Okinawa Institute of Science and Technology, 2017 - 2020
  • Postdoctoral Scholar, University of Oklahoma, 2014 - 2017
  • Research Member, Mathematical Sciences Research Institute, Berkeley, California, Fall 2016
  • Postdoctoral Fellow, ICERM, Brown University, Fall 2013

Papers and Publications

My papers on the arXiv can be found here.

  1. Straightening geometries and geometric flip graphs (with Mark Bell and Valentina Disarlo).
    In preparation.
  2. Detecting danger in gridworlds using Gromov's Link Condition (with Thomas F Burns).
    Preprint, January 2022, arXiv.
  3. Large-scale geometry of the saddle connection graph (with Valentina Disarlo, Huiping Pan, and Anja Randecker).
    Transactions of the American Mathematical Society, Volume 374, Number 11, November 2021, pp 8101–8129. DOI: 10.1090/tran/8448.
  4. Affine diffeomorphism groups are undistorted.
    Journal of the London Mathematical Society, February 2021, Volume 104, Issue 2, pp 747-769, DOI: 10.1112/jlms.12445.
  5. Rigidity of the saddle connection complex (with Valentina Disarlo and Anja Randecker).
    Journal of Topology, September 2022, Volume 15, Issue 3, pp 1248-1310, DOI: 10.1112/topo.12242.
  6. Cubical geometry in the polygonalisation complex (with Mark Bell and Valentina Disarlo).
    Mathematical Proceedings of the Cambridge Philosophical Society, July 2019, Volume 167, Issue 1, pp. 1-22, DOI: 10.1017/S0305004118000130.
  7. Veech surfaces and simple closed curves (with Max Forester and Jing Tao).
    Israel Journal of Mathematics, February 2018, Volume 223, Issue 1, pp 323-342, DOI: 10.1007/s11856-017-1617-5.
  8. Shadows of Teichmüller discs in the curve graph (with Richard Webb).
    International Mathematics Research Notices, June 2018, Volume 2018, Issue 11, pp 3301–3341, DOI: 10.1093/imrn/rnw318.
  9. Projections in the curve complex arising from covering maps.
    Pacific Journal of Mathematics, August 2017, Vol. 291, No. 1, 213-239, DOI: 10.2140/pjm.2017.291.213.
  10. The curve complex and covers via hyperbolic 3-manifolds.
    Geometriae Dedicata, December 2012, Volume 161, Issue 1, pp 233-237, DOI: 10.1007/s10711-012-9703-7.


  • NSFC Young Scientists Fund, 2022 - 2024
  • JSPS KAKENHI Grant-in-Aid for Early-Career Scientists, 2019 - 2020