About Me

CHEN Xiao

My name is CHEN Xiao (陳 嘯). I am currently pursuing a Ph.D. in Mathematics at Tsinghua University under the supervision of Prof. HUANG Yi (黃 意). My research interests include hyperbolic geometry, knot theory, combinatorial topology, and Teichmüller theory.

Beyond mathematics, I am also engaged in research on Chinese dialectology, with a particular focus on the Hangzhou dialect, a subvariety of Wu Chinese.

Email: x-chen20 AT mails DOT tsinghua DOT edu DOT cn

Research & Publications

PREPRINT August 2025

Linear Bound for Kakimizu Complex Diameter of Hyperbolic Knots (Joint with Wujie Shen)

PREPRINT July 2025

Uniqueness of Maximal Curve Systems on Punctured Projective Planes (Joint with Wujie Shen)

PREPRINT August 2024

Systems of Curves on Non-Orientable Surfaces

THESIS April 2020

Undergraduate Thesis: Gauss-Bonnet Theorem for Surfaces and Its Applications (in Chinese)

Talks

Geometric Intersection Complexes

January 2025
Topology Seminar
KAIST, Daejeon

Maximal Systems of Curves on Surfaces

October 2024
Topology & Group Theory Seminar
Vanderbilt University, Nashville

Maximal Systems of Curves

September 2024
GIST Seminar
Boston College, Boston

Maximal Systems of Curves Intersecting Pairwise Once on Non-Orientable Surfaces

April 2024
The 735th Doctoral Academic Forum of Tsinghua University
Tsinghua University, Beijing

Maximal Systems of Intersecting Curves on Surfaces

December 2023
N-KOOK Seminar
Osaka University, Osaka

Maximal Systems of Intersecting Curves on Surfaces

December 2023
Nara Topology Seminar
Nara Women's University, Nara

Seminars

G2T2 Seminar

Beijing 2025-

The G2T2 Seminar is organized by Ph.D. students and postdoctoral researchers at Tsinghua University specializing in geometry and topology, serving as an academic platform for exchange. The name “G2T2” refers to the three major fields of Geometry, Group Theory, and Topology, as well as their interdisciplinary directions. The seminar aims to foster mutual encouragement among young scholars, stimulate academic thinking, and broaden research horizons.

Organizers: Yifei CAI, Xiao CHEN, Diptaishik CHOUDHURY, Qiliang LUO, Tuo SUN, Ivan TELPUKHOVSKIY, and Daxun WANG

Latest Seminar:

Time: June 6, 2025, 10:00 AM
Place: Ningzhai 203
Speaker: Kyle FULLER (Rensselaer Polytechnic Institute)
Title: A Discussion of Goodstein's Theorem and the Kirby-Paris Hydra Theorem
Abstract: We begin by introducing Goodstein's theorem and the Kirby-Paris hydra theorem, two well-known results that are expressible in the language of Peano Arithmetic but are beyond its ability to prove. We then review some relevant background from mathematical logic, including Gödel's incompleteness theorems, Gentzen's result on the consistency of Peano Arithmetic, and transfinite ordinals. Next, we cover a proof of both Goodstein's theorem and the Kirby-Paris hydra theorem. Finally, we discuss a surprising result by Kirby and Paris, who built on the foundational work of Gödel, Gentzen, and others to show that both theorems are unprovable in Peano Arithmetic.

YMSC Topology Seminar

Beijing 2021-

The YMSC Topology Seminar is devoted to frontier topics in topology, geometry, and related fields. It regularly invites scholars from across the mathematical community to share their work and engage in meaningful exchange, with the aim of fostering academic dialogue and broadening intellectual horizons.

Organizers: Weiyan CHEN, Honghao GAO, Yi HUANG, Jianfeng LIN, and Weifeng SUN

Latest Seminar:

Time: Time: Sept 8, 2025, Monday, 16:00-17:00
Place: Shuangqing Complex Building A, room C654
Speaker: Sabyasachi MUKHERJEE (Tata Institute of Fundamental Research)
Title: Simultaneous uniformization and algebraic correspondences
Abstract: Algebraic correspondences on the Riemann sphere provide a rich and interesting class of conformal dynamical systems that contains rational dynamics and Kleinian group actions as important sub-classes. We will discuss two combination theorems in the world of algebraic correspondences. The first one combines holomorphic Blaschke products with genus zero orbifolds, while the second combines/uniformizes two possibly non-homeomorphic genus zero orbifolds. The latter result can be regarded as an extension of the Bers' simultaneous uniformization theorem in the world of algebraic correspondences. Time permitting, we will also present new complex-analytic realizations of Teichmüller spaces of punctured spheres in parameter space of correspondences.