Oye's parents are ready to return home after a week in New York.

Before leaving, Lao Ou talked to Shen Qi alone.

Lao Ou said: "Actually, I am resolutely opposed to Ou Ye coming to the United States, but she insists on coming, and I can only follow her." ”

Your opposition is invalid, Comrade Ou, your wife has the final say. Shen Qi, who has grasped the main contradiction, is not afraid of Lao Ou now, Lao Ou is a little monster, and Mrs. Ye is the core figure.

provoked Lao Ou, and at most he was beaten.

If he offends the real estate tycoon Mrs. Ye, Shen Qi may never see Ou Ye again in his life.

"Uncle Ou, please rest assured, I will definitely take care of Ou Ye with my life, she is your daughter and my girlfriend. Shen Qi solemnly assured that no matter what, Lao Ou was Ou Ye's father, and he had to respect him if he wasn't afraid.

"Hey, my daughter is older, and she has her own choice after all. Lao Ou leaned on a tree melancholy, took out a pack of Marlboros, took out a cigarette and snuffed it out after two puffs: "American cigarettes, it's too difficult to smoke." ”

Lao Ou's attitude was no longer so tough, and Shen Qi struck while the iron was hot: "I will give Ou Ye the happiest home." ”

Lao Ou asked: "Let's be honest, you and Ou Ye plan to return to China in a few years? You are both 22 years old this year, and you are not too young to finish studying." ”

Shen Qi said: "Actually, I can return to China after I get a PhD from Princeton in September this year, mainly depending on Ouye's learning progress, and when she wants to return to China, I will go back with her." ”

"How did you study so fast, you have only been in the United States for less than two years, and you have all completed your master's and doctorate's degrees?

"I don't have any special skills, Uncle Ou, I can only read. ”

"When I first met you, I admired you, but then I met you a few more times and had some opinions about you. Although you have many faults, I admit that you are a genius when it comes to reading, and you are also a clever person. My only request now is that you must not bully or disappoint Ou Ye, otherwise I will not let you go. "The old Ou tiger's body was shocked, and he was equally ennoble.

Shen Qi raised his finger: "Swear to mathematics, I only love Ou Ye in my life!"

"I swear that there is a fart, I have to do it with my heart!" Lao Ou scolded, but he could also see that Shen Qi was sincere to Ou Ye.

Lao Ou took out a Marlboro and handed it to Shen Qi, this was the first time he handed Shen Qi a cigarette: "Do you smoke?"

Shen Qi waved his hand and said, "No, no, smoking is harmful to your health, Uncle Ou, you should also smoke less." ”

"It's good not to smoke. Lao Ou put the cigarette back into the cigarette case and asked, "Do you drink?"

"Have a little drink once in a while. ”

"Then I'll rest assured, eating, drinking, prostituting, gambling, smoking, men have to be the same, if you don't touch anything, and read all day long and pretend to be like a saint, then I will think you have a big problem. "Lao Ou's way of inspecting Shen Qi is quite special, it can be regarded as a final review, but it has to be passed, Ou Ye has already come to the United States.

The next day, Lao Ou and his wife left the United States, and they will effectively supervise Shen Qi's commitment through irregular flight inspections and telephone spot checks.

Columbia University Girls' Dormitory, Ouye's Room.

"Come, hug, little leaf. Shen Qi hugged Ou Ye and pampered him.

"Hmm...... Take a shower first...... Bad apple...... My parents just left......"

"Do you know, Xiao Yezi, I'm going to name a new theorem soon, Shen's proximity theorem. ”

"Good...... Awesome......"

"You're not with me, and it doesn't make sense for me to name a hundred theorems. Thank God, you're finally here, let's do a Shen-Euclidean equation together, okay?"

"Okay...... In what way?"

"You are the best at the Diophantine equation, shall we start with the Diophantine equation?"

"Hmm...... Today at most, it will only be solved ...... Linear equation...... Equations above the quadratic ...... Concubines can't do it......"

……

……

Shen Qi spent the night in Ouye's dormitory, the little couple hadn't seen each other for a year, and they were very affectionate, and there was no need to show more about solving the equation.

Ou Ye's physical condition can only solve the equation once at most, Shen Qi understands Ou Ye, and he is measured.

Skill: Solving equations with reasonable skills is beneficial to strengthen mathematical relationships, and can also promote blood circulation and metabolism.

After dawn, Shen Qi took Ou Ye to meet Ou Ye's mentor Gong Changwei.

"Big brother, it's like your home turf. Ou Ye held Shen Qi's hand, she was an official student of the Department of Mathematics at Columbia University, and Shen Qi was a family member of the student.

"I know Professor Gong very well, we have had meetings together, and he was also my reviewer, and Walsh guessed that he was the one who verified it. Shen Qi and Ou Ye walked into the building of the Department of Mathematics of Columbia University hand in hand and met Professor Gong Changwei, an expert in number theory.

"Senior brother, Professor Gong, Ou Ye will ask you, you should guide her more in mathematics, especially in number theory. Shen Qi said.

"Our Columbia University's internal business, still use you to worry about it?" Gong Changwei said with a smile.

"The Ivy League Eight is a family, you have me, I have you. Shen Qi also smiled.

"Hi Ouye, hello, we interviewed on video and are not strangers. Gong Changwei greeted Ou Ye.

Ou Ye replied politely: "Professor Gong is good, give me a lot of advice." ”

Gong Changwei explained the basic academic requirements of some graduate students in the Department of Mathematics of Columbia University, which are similar to those of General University, Ou Ye needs to attend classes, assist in research, and write papers, and can obtain a master's degree in mathematics from Columbia University in one or two years at the earliest, and at least three or five years.

After leaving the mathematics department building, Ou Ye reluctantly said to Shen Qi: "Qi, you hurry back to Pu University, you have delayed your studies too much recently." ”

"The doctoral students of the University are all free-range, and there is only one requirement, and they drink coffee every Wednesday. Shen Qi said, "But I still have to go back to Puda first, I have nothing to delay, what I'm afraid of is delaying your studies." After all, you are a newcomer and have a heavy academic load, and you need to meditate for a while to find your academic status. ”

Ou Ye nodded: "Well, I will try." ”

"Then I'm leaving, I won't come back to Columbia in a month, and I'll come to see you in a month. Shen Qi kissed Ou Ye goodbye and drove back to Princeton.

Princeton is more than an hour's drive from Columbia University, not far away, not close, and it is convenient if you have a car.

Shen Qi really has nothing to delay, he has already completed all the preparation materials for the graduation of the Ph.D. from the University before Christmas, and he is now waiting for the doctoral graduation defense.

Although there were no hard and fast requirements, Shen Qi still wanted to do something meaningful, and he began to draft the History of Number Theory, which was his hobby, not a necessary condition for obtaining a PhD.

Number theory studies pure numbers, and because of her pure and noble origin, she is known as the "Queen of Mathematics".

Number theory can be divided into two main branches, one of which is the study of the solution of equations, the Diophantine equation, which dates back to about 2,000 years ago and was founded by the great Greek mathematician Diophantus.

Fermat, Andrew Wiles, Faltins and other masters have contributed to this field, and the famous Diophantine equations include Fermat's Great Theorem, Catalan's Theorem, and BSD, the first two of which have been shown to be difficult to pervert BSD and one of the seven millennial puzzles.

The Walsh conjecture, proved by Shen Qi, also belongs to the Diophantine series of equations, and the Walsh conjecture was renamed Walsh's theorem a year ago and can be directly cited.

Another branch of number theory is analytic number theory, which was founded by Gauss, Riemann, Euler, Dirichlet, Weyl, and other masters.

Notable cases in analytic number theory include Gauss's trigonometry and theorem, Euler's pentagonal number theorem, Dirichlet's proof of two prime problems, Weyl exponents and formulas, Goldbach's conjecture, Riemann's conjecture, and many more.

Most of the well-known analytic number theory problems have been solved, and only the Goldbach conjecture and the Riemann conjecture remain to be overcome.

From the perspective of the history of number theory, Shen Qi tries to have a deeper understanding of the Diophantine equation and analytic number theory.

If you force your attack to vomit, it's better to find some inspiration from the masters of mathematics in history.