Zhou Yu'an

Biodata

Feature	Information
Name	Zhou Yu'an (周雨安)
Alias(es)	Zhou Da Zui (“Big-Mouthed Zhou”); Old Zhou; “Tyrant” 120 445
Gender	Male
Affiliation	Chinese Mathematical Olympiad team (former); Yanjing University School of Mathematics; Princeton University; Shen Qi Mathematical and Physical Research Center 43 260 412
Occupation/Role	Mathematician; Princeton PhD; research fellow; manager of the Center Mathematics Department 412 445 559
Status	Active 704
First Appearance	Chapter 43, “I’m Speaking English” 43

Academic Career

Stage	Chapter	Notes
Chinese Mathematical Olympiad team member	43 313	Shared a room with Shen Qi after both made the six-person official team roster; later recalled receiving an IMO gold medal in London with a score of 32.
Yanjing University Golden Autumn Camp trainee	63 66	Ranked third overall with 8.4 points despite a 10-point deduction; evaluators recommended training him on a conventional mathematics-major track.
Yanjing University mathematics student	172 199	Earned a perfect score in Mathematical Analysis and later achieved five consecutive perfect exam scores, becoming the top regular student in the department.
Mathematics class monitor	212	Took over Shen Qi’s class-monitor position; his prestige, connections, and organizational ability made him a central figure among the students.
Princeton graduate student / PhD candidate	242 260 275	Earned a 112 TOEFL score and a 4.0 GPA, then began graduate study at Princeton under Professor Faltings.
Princeton PhD graduate	369 412	His dissertation was initially rejected after its later sections went off track; Shen Qi advised major revisions, and Zhou later completed the PhD.
Researcher at Shen Qi’s center	412	Returned to China as a researcher with associate-professor-level pay after receiving his Princeton PhD.
Mathematics Department manager / designated second-in-command	445 559 574	Gradually assumed management responsibilities for the center’s mathematics work and organized the Mathematical Grand Unification project.

Background & History

Zhou Yu'an met Shen Qi at seventeen through the national Mathematical Olympiad training program. They traveled to the United Kingdom as teammates, shared a hotel room, and began the long friendship that would define much of Zhou’s academic life. 43 445

At the Yanjing University Golden Autumn Camp, Zhou ranked among the strongest trainees but trailed Shen Qi and Ou Ye in rapid-response calculation. The camp’s assessment regarded him as a balanced student suited to a conventional mathematics path rather than a narrowly specialized one. 63 66

At Yanjing University, he became Shen Qi’s roommate and eventual successor as class monitor. He combined excellent grades with strong social and organizational skills, though he repeatedly measured himself against Shen Qi and Ou Ye. 172 210 212

After Shen Qi received admission to Princeton, Zhou privately prepared to follow a similar route. His rented apartment was filled with the same mathematics books, journals, problem sets, and study materials Shen Qi had used during the previous two years. 210

Zhou entered Princeton under Professor Faltings but suffered a major setback when his dissertation was rejected after three semesters of work. Shen Qi reviewed the thesis, urged him to cut away its failing portions, and offered a new route toward its conclusion. 369 412

Following his PhD, Zhou returned to China and joined Shen Qi’s research center. When his nonlinear partial differential equations project produced no results for over a year, he openly confronted Shen Qi over the director’s growing focus on power and administration. Shen Qi valued his honesty and began preparing him to manage the Center Mathematics Department. 445

Appearance

A camp physical examination recorded Zhou at 1.69 meters and 65.1 kilograms. 73

• Diagnosed with color deficiency during the Golden Autumn Camp physical examination; this could limit certain academic-major choices. 73
• Has poor long-distance-running endurance, collapsing after 2,000 meters during training. 129
• Was criticized by Tan Lulu for maintaining an overly shabby hairstyle. 187

Personality

Zhou is notably talkative, dramatic, and prone to lengthy explanations. His double-limit solution irritated Professor Lu because he explained it too verbosely, earning him the “Big-Mouthed Zhou” reputation. 120

He is socially perceptive and enjoys analyzing other people’s relationships, particularly Ou Ye’s feelings for Shen Qi. However, his confidence in romantic advice is undercut by his own unsuccessful pursuit of Tan Lulu and his admitted lack of relationship experience. 187 191 192

Despite frequent insecurity over Shen Qi’s achievements, Zhou is candid enough to challenge Shen directly. His refusal to flatter Shen Qi, even after Shen became a center director, makes him one of the few people Shen trusts to speak honestly. 164 445

Abilities & Skills

Mathematics

Zhou is an IMO gold medalist with a strong mathematical foundation and high academic performance. 172 313

• Specializes primarily in Differential Geometry and Partial Differential Equations. 575 663
• Earned perfect scores in Mathematical Analysis and five consecutive university examinations. 172 199
• Developed a doctoral dissertation combining Differential Geometry and Partial Differential Equations. 369
• Is less broadly versatile than Shen Qi or Faltings and is described as proficient in only two or three mathematical branches. 445

Mental Calculation and Multitasking

Zhou possesses strong reaction speed, memory, and calculation ability, though he was slower than Shen Qi and Ou Ye in the camp’s rapid-fire tests. 63

• Recalled a long sequence of numbers with only the sixty-first number incorrect. 72
• Can converse while simultaneously processing the core content of Ou Ye’s BSD Conjecture manuscript. 663
• Was assessed as having excellent left-right brain coordination and quick reactions. 72

English

Zhou has strong English ability from his Olympiad experience. 242

• Acted as Shen Qi’s temporary translator during the team’s trip to the United Kingdom. 242
• Scored 112 on the TOEFL, one point above Ou Ye. 242

Leadership and Administration

Zhou’s interpersonal connections and organizational skills exceed Ou Ye’s, making him effective in positions requiring communication and coordination. 212

• Served as class monitor after Shen Qi left for Princeton. 212
• Distributed examination key points and managed department-related notices for classmates. 137
• Became the research center’s designated second-in-command and handled departmental affairs, though he deferred major non-mathematics expenditures to Shen Qi. 559

Cooking

Zhou learned to cook while young and regularly cooks for Shen Qi, Ou Ye, and Yu Lei during gatherings at Princeton. 331

Relationships

• Shen Qi — Olympiad teammate, former roommate, longtime friend, academic rival, and later professional subordinate; Zhou is one of the few people willing to criticize Shen openly. 43 369 445
• Ou Ye — Mathematics classmate and friend; Zhou attempts to advise her on pursuing Shen Qi and later assists her BSD Conjecture team. 191 663
• Tan Lulu — Former crush from the Golden Autumn Camp; Zhou pursued her unsuccessfully before giving up and refocusing on his studies. 71 187
• Professor Faltings — Princeton doctoral advisor; initially approved Zhou’s dissertation topic but rejected the finished thesis when its later work failed. 275 369
• Yu Lei — Former IMO teammate and later Princeton peer; Yu Lei views Zhou as an example of the academic level he hopes to reach. 313 321
• Zhao Tian — Younger mathematics student whom Zhou encouraged to pursue a PhD under him after reviewing the BSD Conjecture team’s work. 663
• Yang Ding Tian — Yanjing University scholar with whom Zhou has a tense mutual recognition after returning to the research center. 412

Notable Quotes

“Whether doing math problems, living life, or dealing with relationships, a clear logic is needed.” 191

“A good horse doesn't eat its way back to its old pasture.” 480

Trivia

• Zhou’s given name includes the character for “rain”; he jokingly attributes it to lacking “water” in his destiny. 663
• He was forced to wear a princess dress after earning five consecutive perfect scores. 199
• He remains unmarried and states that he still likes women. 578 663
• He once claimed to have a boyfriend to prevent Shen Qi from visiting his off-campus apartment, but the apartment was actually devoted to independent mathematics study. 210