Liu Bin

Biodata

Feature	Details
Name	Liu Bin (刘斌)
Alias(es)	Professor Liu; Professor Liu Bin
Gender	Male
Affiliation	University of Science and Technology of China (USTC), School of Mathematics
Occupation/Role	Mathematics professor; Chinese Mathematics Olympiad problem-setter; mentor to Xiao Yi
First Appearance	1

Background / History

Liu Bin is a USTC mathematics professor who sets most problems for the annual Chinese Mathematics Olympiad and has participated in setting International Mathematical Olympiad problems. He visits USTC High School after an anonymous student solves one of his blackboard problems, honoring his promised independent-admissions reward if the solver can explain the method. 1

Intrigued by the anonymous solver, Liu Bin escalates the difficulty of the daily problems and coordinates with Grade Director Chen Liang to identify the student. His final challenge is one of the hardest IMO Preliminary Problems, which he expects would take at least half an hour to solve; Xiao Yi completes it without pausing. 3 4

After identifying Xiao Yi, Liu Bin advocates for his admission to USTC's Young Scholars Program, provides competition materials and university-level textbooks, and introduces him to Academician Hu Guangde. 6 17 20 21

Appearance

Liu Bin is depicted as a middle-aged man who wears glasses. 4 5

• Light reflects from his glasses as he watches Xiao Yi solve the IMO-level problem. 4
• He is often seen carrying or delivering large quantities of mathematical books and papers. 17 38

Personality

Liu Bin is intensely curious about mathematical talent. The unexplained solutions to his blackboard problems motivate him to repeatedly raise their difficulty and personally return to the school despite his teaching schedule. 2 3

He is a supportive but realistic mentor. He pushes Xiao Yi toward advanced material and research opportunities while cautioning him not to waste his talent or overburden himself with an ambitious paper deadline. 18 23 29

Liu Bin is also notably humble. When Xiao Yi submits a paper beyond Liu Bin's expertise in Far Abelian Geometry, he openly admits that he cannot evaluate it and seeks Academician Hu's help rather than pretending otherwise. 37 38

Abilities & Skills

Mathematics and Olympiad Problem Setting

Liu Bin is an experienced mathematics professor and competition problem-setter.

• Sets most annual Chinese Mathematics Olympiad problems. 1
• Participated in IMO problem-setting. 1
• Selects and assesses problems at IMO level, including an exceptionally difficult IMO Preliminary Problem. 4
• Recognizes the importance of independent, flexible thought in mathematical problem-solving. 14

Academic Mentorship

Liu Bin identifies Xiao Yi's potential early and actively creates opportunities for him.

• Recommends Xiao Yi for the USTC Young Scholars Program. 5 6
• Supplies competition problems alongside undergraduate- and graduate-level mathematics texts. 13 17 18
• Introduces Xiao Yi to Academician Hu Guangde for an advanced assessment. 20 21
• Advises Xiao Yi on thesis topics, Number Theory, research papers, authorship, and journal submission. 28 29 41
• Helps arrange for Hu Guangde to accompany Xiao Yi to a Far Abelian Geometry conference in Germany. 61

Academic Integrity and Advocacy

Liu Bin protects Xiao Yi's interests even when doing so denies himself credit.

• Sends Xiao Yi's Far Abelian Geometry paper to Hu Guangde when it exceeds Liu Bin's own specialty. 38
• Supports a plagiarism check before submission; the paper returns a 3.14% similarity rate. 40
• Insists that Xiao Yi be both sole author and corresponding author because Liu Bin did not contribute to the research itself. 41
• Warns Xiao Yi not to casually share unpublished work because academic circles can be exploitative. 41

Equipment / Materials

• Competition problem sets prepared for Xiao Yi. 17
• More than forty mathematics books, spanning undergraduate, graduate, and English-language texts. 18
• Recommended texts include Mathematical Analysis, Advanced Algebra, Analytic Geometry, Elementary Number Theory, Principles of Number Theory, and Principles of Algebraic Geometry. 18 21
• Papers by prominent Number Theory researchers for Xiao Yi's thesis preparation. 29
• Printed copy of Xiao Yi's 25-page paper, brought to Hu Guangde for evaluation. 38

Relationships

• Xiao Yi — Mentor and early discoverer of Xiao Yi's mathematical ability. He recruits him toward USTC, provides advanced resources, guides his first paper submission, and continues supporting him after enrollment. 5 17 41 61 92 133
• Chen Liang — Grade Director of USTC High School and Liu Bin's collaborator in locating the anonymous “Math Prodigy.” 1 3 4
• Hu Guangde — USTC academician whom Liu Bin introduces to Xiao Yi; Liu Bin relies on Hu's Far Abelian Geometry expertise to review Xiao Yi's paper. 20 21 38 40
• Qin Song — Grade 2 Director who keeps Liu Bin informed of Xiao Yi's exam performance and supports Xiao Yi's prospects. 13 14
• Luo Penghua — Xiao Yi's homeroom teacher; Liu Bin recognizes that Luo's support would strongly affect Xiao Yi's Young Scholars Program decision. 7 17 18

Story Role / Major Arcs

The Blackboards and the “Math Prodigy”

Liu Bin posts increasingly difficult mathematics problems at USTC High School to find their anonymous solver. After witnessing Xiao Yi solve the hardest IMO Preliminary Problem, he identifies him as the student he has been seeking. 1 3 4 5

Young Scholars Program Recruitment

Liu Bin argues that Xiao Yi is qualified for the USTC Young Scholars Program and believes that an IMO gold medal would be more valuable than the program itself. He remains convinced of Xiao Yi's ability despite initially unremarkable prior exam results. 6 9 14

Advanced Mathematical Training

Liu Bin personally delivers competition materials and a large advanced reading list, explaining that competition exercises are largely recreational for Xiao Yi compared with university mathematics. 17 18

First Paper and Far Abelian Geometry

After Xiao Yi selects an unusually difficult topic Liu Bin had inadvertently included among his recommendations, Liu Bin discovers he cannot understand the completed paper. He brings it to Hu Guangde, helps verify its originality, and guides Xiao Yi through proper authorship and submission practices. 29 37 38 40 41

USTC Mentor

Following Xiao Yi's enrollment at USTC, Liu Bin remains an advisor and instructor. He receives Xiao Yi's invitation to the Max Planck Institute conference, assists with travel arrangements, teaches his Mathematical Analysis class, and later supports Xiao Yi's entrepreneurship application and workspace request. 61 92 133

Notable Quotes

“What's yours will always be yours.” 41

“Also, in the future, don't casually send your written papers to others. The academic world isn't clean; it can even be quite dirty. Protect yourself and protect your achievements.” 41

Trivia

• Liu Bin initially intended for Xiao Yi to humble other gifted students at USTC, but Xiao Yi's growth instead leaves Liu Bin questioning his own expectations. 22 61
• He studies Xiao Yi's draft work in an attempt to understand the prodigy's thought process, while acknowledging that genius cannot simply be imitated. 20
• Xiao Yi's paper was the first work Liu Bin had to submit to another expert because it lay beyond his own research specialization. 38