... For Angling may be said to be so like the Mathematics that it can never be fully learned; at least not so fully but that there 
will still be more new experiments left for the trial of other men that succeed us. 

                                                      -- from The Compleat Angler by Izaak Walton 

Research Interests:

• Symbolic Computation
• Differential and Difference Algebra
• Combinatorics (Wilf-Zeilberger Method)
• Arithmetic Theory of Power Series (Rationality Theorems)

Education:

• 2001/09 -- 2005/07, B.Sci., Mathematics, Jiangsu University , Jiangsu, China.
• 2005/09 -- 2010/12, Ph.D., Applied Mathematics, Academy of Mathematics and Systems Science , Chinese Academy of Sciences, Beijing, China.

Supervisor:  Ziming Li (AMSS, China).

• 2007/12 -- 2011/02, Ph.D., Computer Science, co-directed between Academy of Mathematics and Systems Science (Beijing, China) and École Polytechnique (Paris, France).

Co-supervisors:  Frédéric Chyzak (INRIA, France) and Ziming Li (AMSS, China).

Dissertation: Some Applications of Differential-Difference Algebra to Creative Telescoping (version in Chinese)

Positions:

• 2017/03 -- present, Associate Professor, Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing, China.
• 2013/07 -- 2017/03, Assistant Professor, Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing, China.
• 2015/10 -- 2016/08, Fields-Ontario Postdoctoral Fellow, Fields Institute and Faculty of Mathematics, University of Waterloo, Ontario, Canada

  Working with Stephen M. Watt and George Labahn.

• 2011/08 -- 2013/07, Post-Doctoral Fellow, Department of Mathematics, North Carolina State University, Raleigh, USA.

  Working with Michael F. Singer.

• 2011/02 -- 2011/08, Post-Doctoral Fellow, Research Institute for Symbolic Computation, Johannes Kepler University Linz, Hagenberg, Austria.

  Working with Manuel Kauers.

Professional Activities:

Academic Positions

Member At-Large of the [ISSAC Steering Committee] (July 2019 - July 2022)

Secretary of [ACM SIGSAM] (July 2021 - June 2023)

中国数学会计算机数学专业委员会秘书长( Secretary of [Chinese Society of Computer Mathematics] ) (June 2021 - June 2025)

Editorial Boards

Journal of Symbolic Computation [Journal Homepage] (Since 2023)

Journal of Difference Equations and Applications [Journal Homepage] (Since 2023)

Maple Transactions (An open-access online journal) [Journal Homepage] (Since 2021)

Journal of Systems Science and Complexity [Journal Homepage] (Since 2020)

Annals of Combinatorics [Journal Homepage] (Since 2019)

系统科学与数学 (Journal of Systems Science and Mathematical Sciences Chinese Series) [Journal Homepage] (Since 2019)

ACM Communications in Computer Algebra [Journal Homepage] (Since 2014)

Preprints:

1. Reducing hyperexponential functions over monomial extensions, 2023.
   with Hao Du, Yiman Gao, and Ziming Li: [PDF]

2. D-finiteness, rationality, and height III: multivariate Pólya-Carlson dichotomy, 2023.
   with Jason P. Bell, Khoa D. Nguyen, Umberto Zannier: [PDF]

3. Shift Equivalence Testing of Polynomials and Symbolic Summation of Multivariate Rational Functions, 2023 (updated).
   with Lixin Du and Hanqian Fang: [PDF] [Maple package]

4. Telescopers for Differential Forms with One Parameter, 2021.
   with Ruyong Feng, Ziming Li, Michael F. Singer, Stephen M. Watt: [PDF]

Published Papers: publist

PhD Students:

Huajun Bian (边华俊，2023/09-2028/07)

Hanqian Fang (方涵芊，2022/09-2027/07)

Xiuyun Li (李秀云，2021/09-2026/07, joint PhD student with Manuel Kauers)

Yisen Wang (王艺森，2021/09-2026/07, joint PhD student with Christoph Koutschan)

Pingchuan Ma (马平川，2019/09-2024/07)

Lixin Du (杜丽欣，2017/09-2022/07, joint PhD student with Manuel Kauers and now postdoc at Johannes Kepler University in Linz)

Chaochao Zhu (朱超超，2016/09-2021/07, now at West Anhui University)

Postdocs:

Yingrui Zhang (张英瑞， 2022/07-2024/08)

Tianlong Yu (虞天龙， 2021/07-2023/08)

Talks:

1. Separability Problems in Creative Telescoping. ISSAC2021, Saint Petersburg, Russia, July 20, 2021. [Slides] [Paper]

2. A Reduction Approach to Creative Telescoping. ISSAC2019 Tutorial Lectures, Beihang University, Beijing, China, 2019. [Slides] [Extended Abstract]

3. How to generate all possible WZ-pairs algorithmically? Chinese Mathematical Society 2018 Annual Conference, Guiyang, Guizhou, China, 2018. [Slides]

4. Symbolic Integration: A Brief Introduction. Seminar at the School of Mathematics, Liaoning Normal University, Dalian, China, 2018. [Slides]

5. D-finite Generating Functions in Enumerative Combinatorics. Chinese Congress on Combinatorics and Graph Theory 2018, Hefei, China, 2018. [Slides]

6. Rationality Theorems on D-finite Power Series. Seminar at the School of Mathematical Sciences, East China Normal University, Shanghai, China, 2018. [Slides]

7. Reduction-based Algorithms for Creative Telescoping. Joint International Meeting of CMS-AMS, Shanghai, China, 2018. [Slides]

8. D-finite Functions: Algorithmic, Analytic and Arithmetic Aspects. Computer Mathematics 2017, Xiangtan, China, 2017. [Slides]

9. Power Series with Coefficients from a Finite Set. Lattice walks at the Interface of Algebra, Analysis and Combinatorics (2017), Banff, Canada, 2017. [Slides]

10. Creative Telescoping: Theory and Algorithms. MITACS Seminar Series/ORCCA Joint Lab Meeting, Western University, Canada, 2016. [Slides]

Research Notes (unpublished):

1. A Note on Lipshitz's Lemma 3.
   with Ziming Li, 2011: [PDF].

2. A Note on Ostrogradsky and Horowitz's Method.
   with Ziming Li, 2010: [PDF].

3. A Exercise on Real Elementary Functions in the Book "Symbolic Integration I" (second edition) .
   with Ruyong Feng, Ziming Li, Huaifu Wang, 2008: [PDF].

Teaching:

1. Linear Algebra (2014-2015) at University of Chinese Academy of Sciences.
2. Linear Algebra (2016-2017) at University of Chinese Academy of Sciences.
3. Abstract Algebra II (2019-2020) at Beihang University.
4. Abstract Algebra II (2021-2021) at Beihang University.

Seminar and Conferences:

1. Computer Mathematics Seminar
2. ACA 2022 Special Session: D-finite Functions and Beyond: Algorithms, Combinatorics, and Arithmetic
3. Workshop on Combinatorics and Symbolic Computation

Extreme Meter