I. 主要研究工作

1. 函数逼近论；

2. 统计学习理论。

II. 承担科研项目

北京市教委科技一般项目：一些特殊函数的有理逼近问题，项目负责人，2018-2020。

III. 代表性学术论文

1. Di-Rong Chen, Xu You. Minimax optimal rates of convergence for multicategory classifications. ACTA Mathematica Sinica-English Series, 2007, 23(8), 1419–1426.

2. Xiaodong Cao, Xu You. Multiple-correction and continued fraction approximation(II). Applied Mathematics and Computation, 2015, 261, 192-205.

3. Xiaodong Cao, Hongmin Xu, Xu You. Multiple-correction and Faster Approximation. Journal of Number Theory, 2015, 149, 327-350.

4. Xu You. Some new quicker convergences to Glaisher–Kinkelin’s and Bendersky–Adamchik’s constants. Applied Mathematics and Computation, 2015, 271, 123-130.

5. Xu You, Di-Rong Chen. Improved continued fraction sequence convergent to the Somos' quadratic recurrence constant. Journal of Mathematical Analysis and Applications, 2016,436 (1), 513-520.

6. Xu You, A note on Ramanujan's factorial approximation. International Journal of Number Theory, 2016,12 (5), 1187–1194.

7. Xu You, Di-Rong Chen, Hong Shi. Continued fraction inequalities related to (1+1/x)^x. Journal of Mathematical Analysis and Applications, 2016,443 (2), 1090-1094.

8. Xu You, Shouyou Huang, Liu Lu. Some inequalities associated to the ratio of Pochhammer $k$-symbol. Mathematical Inequalities & Applications, 2017, 20 (1), 105–110.

9. Xu You. Approximation of the median of the gamma distribution. Journal of Number Theory, 2017,174, 487–493.

10. Xu You. Continued fraction approximation for the Gamma function by the Tri-gamma function. Results in Mathematics, 2017,72 (4), 2121–2127.

11 Xu You, Di-Rong Chen. Sharp approximation formulas and inequalities for the Wallis ratio by continued fraction. Journal of Mathematical Analysis and Applications, 2017,455 (2), 1743-1748.

12. Xu You, Min Han. Continued fraction approximation for the Gamma function based on the Tri-gamma function. Journal of Mathematical Analysis and Applications, 2018,457 (1), 389-395.

13. Xu You. Some sequences converging towards the Ioachimescu's constant related to Ramanujan formula. The Ramanujan Journal, 2018,45 (2), 391–397.

14. Xu You, Di-Rong Chen. Improved approximation formulas and inequalities for the Wallis ratio. Bulletin of the Iranian Mathematical Society, 2019,45(3), 783–789.

15. Xu You. Improved asymptotic formula and inequalities for the ratio of Pochhammer $k$-symbol. Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A. Matemáticas, 2020,114 (3).

16. Xiaocui Li, Xu You. Mixed finite element methods for fractional Navier-Stokes equations. Journal of Computational Mathematics, 2021,39(1), 130–146.

17. Min Han, Hongliang Zhang, Xu You*, Zhaoxu Sun. Approximations for the Ratio of Gamma Functions via Digamma function and Its Applications. Bulletin of the Brazilian Mathematical Society, New Series, 2021,52, 415–427.

IV. 招生信息

本人目前主要招收信息（0811）专业学位硕士（控制科学与工程方向）。诚挚欢迎数学与应用数学、信息与计算科学、统计学等专业，勤奋踏实，勇于创新，具备扎实的数学基础、较强的计算机应用能力以及较高英语水平的同学报考。

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