I am currently a Lecturer-Researcher at the Department of Mathematics, FPT University, Da Nang. Previously, I was a Lecturer at the University of Da Nang and a Boya Postdoctoral Fellow at the Beijing International Center for Mathematical Research, Peking University. I earned my Ph.D. in Mathematics at the University of Wisconsin–Milwaukee (2019), under the supervision of Prof. Chris Hruska.. Here is a copy of my CV.

My research interests lie in geometric group theory and low-dimensional topology.

Email: nthoang.math@gmail.com / hoangnt63@fe.edu.vn 

Distinction: 

Scientific Prize of the Institute of Mathematics, Vietnam Academy of Science and Technology, 2021.

Publications and preprints:

1) Distortion of surfaces in graph manifolds. Joint with Chris Hruska. Algebraic & Geometric Topology 19 (2019), no. 1, 363–395

2) Quasi-isometry of pairs: surfaces in graph manifolds.  International Journal of Algebra and Computation, Vol.29, No.04, pp 681-698 (2019).

3) On the coarse geometry of certain right-angled Coxeter groups. Joint with Hung Cong Tran. Algebraic & Geometric Topology 19-6(2019) 3075-3118.

4) On the relative hyperbolicity and manifold structure of certain right-angled Coxeter groups. Joint with Matt Haulmark and Hung Cong Tran. International Journal of Algebra and Computation, 30 (2020), no.3, 501-537.  

5) Distortion of surfaces in 3-manifolds. Journal of Topology, (2019) 12(4): 1115-1145

6) Subgroup distortion of 3-manifold groups. Joint with Hongbin Sun. Transactions of the American Mathematical Society., 373 (2020), no. 9, 6683-6711 .

7) Quasiconvexity in 3-manifold groups. Joint with Hung Cong Tran and Wenyuan Yang. Mathematische Annalen, 381, 405-437 (2021).

8) Strongly quasiconvex subgroups in amalgams and HNN extension. Joint with Hung Cong Tran. International Journal of Algebra and Computation, Vol. 33, No. 03, pp. 435-444 (2023) [PDF]

9)  Croke-Kleiner admissible groups: Property (QT) and quasiconvexity. Joint with Wenyuan Yang. Michigan Mathematical Journal, 73 (2023), 971-1019.

10) Sublinearly Morse boundary of CAT(0) admissible groups. Joint with Yulan Qing. Journal of Group Theory, vol. 27, no. 4, 2024, pp. 857-897. [Pdf]

11) Finite height subgroups of extended admissible groups. [PDF]. New York Journal of Mathematics., 30 (2024) 1220–1234. 

12)  Largest hyperbolic action of 3-manifold groups. Joint with Carolyn Abbott and Alex Ramussen. arXiv:2305.07425 . [Pdf]  Bulletin of the London Mathematical Society, 56 (2024) :3090-3013.

13) Some remarks on subgroups of free-by-cyclic groups. Joint with Minh Nhat Doan. Vietnam Journal of Mathematics., 54, 715–728 (2026) 

14)  Property (QT) for 3-manifold groups. Joint with Suzhen Han and Wenyuan Yang.  Algebraic & Geometric Topology., 25 (2025) 107–159. [Pdf]

15) Separability properties of extended admissible groups. [Pdf].  Forum Mathematicum. vol. 38, no. 2, 2026, pp. 519-537 

16) Quasi-redirecting boundaries of groups with linear divergence and 3-manifold groups [Pdf]. Arxiv. Geometriae Dedicata, vol. 220, 30 (2026).

17) Quasi-isometric rigidity of extended admissible groups. Joint with Alex Margolis. [Pdf].  Journal of the London Mathematical Society.

18)  Coarse geometry of extended admissible groups. Joint with Toan Trong Dao. arXiv:2512.24784. Submitted.

19) Quasi-redirecting boundaries of non-positively curved groups. Joint with Yulan Qing. [Pdf] Arxiv Submitted.


Teaching Experience:

Fall 2023, Spring 2024, Summer 2024, Fall 2024, Spring 2025: FPT University

Summer 2022: Duy Tan University (Visiting)

Fall 2019: 

2014-2019: University of Wisconsin-Milwaukee

-  Survey in Calculus and Analytic Geometry (4 semesters include 2 semesters for discussion and 2 semesters for the online course)

- Calculus and Analytic Geometry I (1 semester)

- Calculus and Analytic Geometry II (1 semester)

 - Calculus and Analytic Geometry III (3 semesters)

 - Intermediate Algebra (1 semester)

- College Algebra (1 semester)

Grants: