A big bull who is authoritative enough in the field of partial differential equations, Lu Zhou thinks about it, and there is only Mr. Qiu Chengtong.

There is no need to say much about Mr. Qiu's achievements in differential geometry.

Open the preface of the "Lecture Notes on Differential Geometry" and you can see this sentence - "He is the founder of the school of geometric analysis".

What is Geometric Analysis?

It is to move the method of partial differentiation into differential geometry.

Although the domestic academic community has had mixed reviews of him because of the sharp contradictions with Yan University, the international academic community still has a very high evaluation of this Chinese scholar.

And this can be seen from the honors he has received.

There are only two mathematicians in history who have won the Fields Medal, the Wolf Medal, and the Cliveford Prize, one of which is Lu Zhou's mentor Deligne, and the other is Qiu Chengtong.

At that time, when the Chern Prize in Mathematics was presented, Lu Zhou and Mr. Qiu had a relationship, but since then, because of different research directions, there has not been much intersection.

The NS equation is a problem in the field of partial differential equations, and for the field of partial differential equations, among the scholars Lu Zhou knows, there is no doubt that Mr. Qiu's achievements and knowledge are the highest.

In Cambridge, Boston, Massachusetts, a sturdy Ford Explorer parked near the building of the mathematics department.

After getting out of the car, Lu Zhou looked around and didn't recognize how to go next.

So, with his intuition, he casually stopped a passer-by who looked like he was studying mathematics and asked.

"Hello classmates, may I ask, how to get to Professor Qiu's office?"

"You're looking for Professor Qiu?" The bespectacled boy glanced at Lu Zhou suspiciously, always feeling that this person's face looked a little déjà vu, but he couldn't remember where he had seen it, so he asked, "What are you looking for Professor Qiu?" ”

Lu Zhou: "I have some questions I want to ask. ”

Maybe seeing that he was too young and didn't look like he could ask any clever questions, after hearing this, the man with glasses smiled faintly: "Professor Qiu doesn't have time to answer those simple questions for you, if you have any questions, you can ask me directly." ”

Slightly stunned, Lu Zhou immediately smiled and said, "Really?" Then you can solve for me, there is no nontrivial backward self-similar solution to the Navier-Stokes equation. The reason? ”

The moment he heard the question, the man with glasses was stunned.

However, unwilling to admit that he couldn't think of it, he began to try to think about it. However, after frowning and meditating for a long time, I couldn't figure out how to answer this question.

It can be seen that partial differential equations should be his specialty, and he also knows something about Navier-Stokes equations.

However, it is also clear that he does not have enough depth in his major, or that his research direction is not in this area.

Otherwise, it would be easy for him to know with a little study of the Navier-Stokes equation, which was actually answered by three mathematicians, including Necas, in 1995.

Lu Zhou looked at the table below and said casually, "Can you take me now?" ”

"Yes, brother, you did ask me," the man in glasses smiled quietly and nodded reluctantly, "...... Come with me, but Mr. Qiu is a busy man, and I can't guarantee that he will see you. ”

Lu Zhou smiled, didn't say anything, and followed him.

Walking and chatting on the road, Lu Zhou learned that the name of this benevolent brother is Zhao Yi, who graduated from Shuimu with a bachelor's degree, and is now studying in the Department of Mathematics at Harvard, and is studying for a doctorate in Professor Steve Nadis, a good friend of Mr. Qiu.

"You're a freshman in the undergraduate division?"

Lu Zhou did not deny it, but asked rhetorically: "Why do you say that?" ”

Zhao Yi grinned: "Because you look like you have a lot of hair, and you look younger." ”

Lu Zhou: ......?

This......

Is it also a reason?

didn't stop there, Zhao Yi continued to talk eloquently: "...... I guess you saw that question from a reference book, but I suggest that before you study these cutting-edge things, it is better to focus on the knowledge of your major, and lay a solid foundation, which is more important than studying those things that are beyond the curriculum. ”

This benevolent brother is very interesting, his heart is not bad, but he is too enthusiastic.

If you become a professor in the future, you will be loved by hard-working students.

Lu Zhou smiled: "It makes sense, it's taught." ”

Seeing that this "junior" was so taught, Zhao Yi was so happy in his heart, so he smiled heartily and said generously: "When you go out, everyone is a compatriot, and it is appropriate to help each other." If you have any questions you don't understand in the future, you can come to me, call me Brother Zhao, or Brother Sihuo! ”

Lu Zhou: "Then let's call Brother Sihuo." ”

The name sounds interesting.

Zhao Yi said with a smile: "You know my name, then junior, what is your name, you should also tell me." ”

"Lu Zhou."

Land...... Boat?

Zhao Yi was stunned, frowning, and his brain didn't turn for a while.

As they were walking, the two had already arrived at the door of Mr. Qiu's office.

Although the door of the office was open, out of politeness, Lu Zhou knocked lightly.

Stopping the pen in his hand, Mr. Qiu, who was writing at the desk, raised his head.

When he saw the person who appeared at the door, the old gentleman was slightly stunned at first, and then his brows, which were tightly locked in thought, stretched a kind smile.

"Yo, rare guest," put down the pen in his hand, Mr. Qiu got up from his chair, smiled and greeted the door, "what kind of wind blew you out of the Princeton room?" ”

Lu Zhou smiled and said modestly: "I have encountered a little bottleneck in my research, and I would like to ask you some questions about partial differential equations." ”

Seeing Mr. Qiu's attitude towards this young man, Zhao Yi, who was standing at the door, had a crash on the spot, and stood there with a confused expression.

At this moment, he always remembered why that sense of déjà vu came from......

Thinking that he had been pretending to be a big guy for a long time just now, he suddenly wanted to find a crack in the ground to get into.

He didn't notice the change in the expression on the face of the brother at the door, and after hearing Lu Zhou's explanation, a look of interest suddenly flashed in Mr. Qiu's eyes.

"Partial differential equations? This is an area that I am familiar with, can you tell me what the specific direction is? ”

"It's related to the NS equation."

Slightly stunned, the look of interest in Mr. Qiu's eyes became more and more intense.

"NS equation? That's an interesting question...... Sit down first, I'll go find my teapot, I'm afraid I won't be able to finish talking about this topic for a while. ”

Lu Zhou nodded and sat down casually next to the tea table.

At this time, Mr. Qiu suddenly noticed that there was still a person standing at the door, and hesitated slightly.

“…… You are? ”

Zhao Yi hurriedly stood up straight and said, "I'm Zhao Yi, studying for a doctorate with Professor Steve Nadis!" ”

"Oh, Professor Nadis's student," Mr. Qiu hesitated and pushed his glasses, "...... Then you sit too? ”

"No, no need," Zhao Yi hurriedly shook his head, scratched his head and said with a dry smile, "I just brought Professor Lu over, so I won't disturb the two bigwigs to discuss business." ”

Although listening to the bigwigs exchange math problems will definitely help their own research.

But sitting next to these two great gods, the pressure was too great for him to be a little transparent......

"It's all about learning, where is there a big guy," Hearing this interesting speech, Mr. Qiu smiled and beckoned to the young man, "Come and sit down, no matter what you say, drink a cup of tea and leave." ”

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