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Yian Xu
Associate professor
System Science Department
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  • Curriculum Vitae
  • Research
  • Honors and Awards
  • Activity
  • I am now currently enrolled in Department of Mathematics at Southeast University. I finished my undergraduate study at Department of Mathematics of Nanjing Normal University, obtained my Master Degree from Department of Mathematics of Simon Fraser University, and my PhD Degree was got from The University of Western Australia, School of Mathematics and Statistics.
    Currently I am giving two lectures: 1、Calculus I and II (for students in engineering)2、Discrete Mathematics (for students in Math)


  • I am interested in the \chi-boundedness problem in graph coloring, Conway Thrackle Conjecture and determining the normal and non-normal Cayley graphs for isomorphic groups. 


    1. Ran Chen, Baogang Xu, Yian Xu*. The optimal binding function for (cap, even hole)-free graphs,//arxiv.org/abs/2506.19580.

    2. Yian Xu. Non-perfect (P_5, C_5, K_5 − e)-Free Graphs are 5-Colorable. Graphs and Combinatorics, 2025, 41:3.

    3. Yian Xu. The Chromatic Number of (P5, HVN)-free Graphs. Acta Mathematicae Applicatae Sinica, English Series. 2024, 40, 1098-1110.

    4. Di Wu, Baogang Xu, Yian Xu*. The Chromatic Number of Heptagraphs. Journal of Graph Theory. 2024, 106, 711-736.

    5. Yian Xu. Coloring graphs without induced P_5 or K_5-e. Applied Mathematics and Computation. 2024, 461, 128314.

    6. Wei Dong, Baogang Xu, Yian Xu*. A Tight Linear Bound to the Chromatic Number of (P_5, K_1 + (K_1\cup K_3))-Free Graphs. Graphs and Combinatorics. 39 (No. 43), 2023.

    7. Yian Xu. On the structure of pentagraphs. Applied Mathematics and Computation. 2022, 439, 127632.

    8. Wei Dong, Baogang Xu, Yian Xu*. On the chromatic number of some P_5-free graphs. Discrete Mathematics. 2022, 345, 113004.

    9. 吴狄 , 许宝刚 , 许怡安∗, 围长 2l + 1 且无长奇洞图的染色问题. 中国科学：数学, 2023，第53卷，第1期: 103-120. (Di Wu, Baogang Xu and Yian Xu*. On coloring of graphs of girth 2l + 1 without longer odd holes. SCIENTIA SINICA Mathematica (in Chinese). 2023, 53, 1, 103-120.)

    10. Yian Xu. Normal and non-normal Cayley graphs for symmetric groups. Discrete Mathematics. 2022, 345, 112834.

    11. Yian Xu. A better upper bound on the chromatic number of (cap, even-hole)-free graphs. Discrete Mathematics. 2021, 344, 112581.

    12. Yian Xu. A new upper bound for Conway's thrackles. Applied Mathematics and Computation. 2021, 389, 125573.

    13. Michael Giudici, Caiheng Li, and Yian Xu*. Constructing 2-arc-transitive covers of hypercubes. Graphs and Combinatorics. 2019, 35, 973–987.

    14. Yian Xu. On constructing normal and non-normal Cayley graphs. Discrete Mathematics. 2017, 340(12), 2972–2977.

    15. Luis Goddyn and Yian  Xu*. On the bounds of Conway’s thrackles. Discrete & Computational Geometry. 2017, 58(2), 410–416.



  • National Natural Science Foundation of China Youth Project (2022-2024, finished)


    National Natural Science Foundation of China General Project (2025-2028, in progress)


    Natural Science Foundation of Jiangsu Province Youth Project (2021-2023, finished)