Xueba: The Knowledge I Teach, The Crit Is Returned

The Hongqi L5 sedan quickly stopped at a five-star hotel near Yenching University.

This is also the hotel for the scholars of this Daxia Mathematics Conference.

This time, the Daxia Mathematics Conference was held in the first academic lecture hall of Yenching University. As for why he did not choose Shuimu University, which ranked first in the comprehensive strength of Daxia, Gu Bai did not know.

Maybe, Yan Da's math is better than Shuimu?

However, there are many debates on this topic, and there is no definitive answer as to who is stronger and who is weaker.

Anyway, the two universities are the top existences in Daxia.

At the front desk of the hotel, after taking the room card, Gu Bai and Professor Luo Shifei got on the elevator and pressed the 36th floor.

It is said that the 33rd to 36th floors of the hotel are all reserved by the Daxia Mathematical Association. It can be seen that the Daxia Mathematical Association is still very rich. For a hotel of this size, a room is at least 8,000 yuan a night, not to mention tens of thousands of yuan. Bottoming.

A total of 5 days of academic reports will be held at the Daxia Mathematics Conference, which means that the cost of accommodation alone may reach tens of millions in these 5 days.

Of course, this kind of exchange and discussion in the academic circle must not be measured by money.

Before Gu Bai came to his dormitory 3608, Professor Luo Shifei said with a smile: "Your 'Zhou's Conjecture' math report is on the 5th day, if you are interested in other academic reports, you can listen to it. Of course, if you don't have one. Interested reports can also walk around... Yanda is not far from the hotel, and next door to Yanda is Shuimu University.""

"Okay." Gu Bai nodded.

Gu Bai didn't know why the Daxia Mathematical Association arranged Gu Bai's "Zhou's Conjecture" on the last day. Anyway, at least the first few days Gu Bai was relatively relaxed.

"Oh, and also. At 7 o'clock in the evening, there is a small opening ceremony on the top of the building before the start of the mathematics conference, which is referred to as the gathering of mathematicians. If you are interested, you can make some friends and professors in the mathematics community."

At the end, Professor Luo Shifei added another sentence.

"What about you...don't you come with me?" Gu Bai asked curiously, feeling that Professor Luo Shifei seemed to be entrusting the 'later generations'.

As for the gathering of mathematicians, Gu Bai is not actually interested in it, and he doesn't know the bigwigs in the academic world. Even if he knows others, others don't know him.

"I'm not going, I finally came out to meet my old friends." After speaking, Professor Luo Shifei left.

Gu Bai smiled helplessly and didn't care.

After swiping the card to enter the room, open the curtains. I have to say that five-star hotels are expensive for their own reasons. Through the transparent floor-to-ceiling glass windows that occupy the entire wall, you can overlook the entire Yuanmingyuan Garden and Yenching University. This kind of scenery Even at night, it is definitely more beautiful.

The scenery is good, but Gu Bai has no time to appreciate it. He slept late last night, and he had a morning flight this morning... He was too sleepy for a long time.

Lying on the bed, Gu Bai quickly fell asleep.

Gu Bai was woken up by a knock on the door, and it was the hotel staff who knocked on the door, reminding Gu Bai that it was dinner time.

Originally, Gu Bai thought that there would be dinner on the cart, but after a reminder from the waiter, dinner for all mathematicians tonight was on the roof.

Shaking his head, Gu Bai went back to his room to wash his face, and had to take the elevator to the top of the building.

The platform of several hundred square meters on the roof of the hotel was built into a small party at this time.

em...

To be exact, it's a mathematician's party.

At the very center of the platform, two rows of tables covered with white cloth were built, which were piled with food.

There were many professors in Chinese tunic suits who came and went, some of whom had gray hair on the temples, but all of them were very energetic, and their behavior revealed a scholarly atmosphere.

Most of them held champagne in their hands, met acquaintances, or old friends, and greeted each other.

Gu Bai looked around, but there was no one he was familiar with, but not far to the left, surrounded by a crowd, seemed to be Wang Yuan, a leader in the field of 'analytic number theory and algebraic number theory'.

On the right, it seems to be Professor Deng ‘Qiang’ from Zhejiang University.

Unfortunately, Gu Bai has seen Brother Qiang in books and on the Internet, but he does not know Gu Bai.

Walking on the red carpet, Gu Bai came to the tables on both sides of the platform, ate bread and drank champagne, and heard the opinions of mathematicians on a certain mathematical theory from time to time, which was also very interesting.

After he was full, he patted his stomach. Gu Bai was about to go down for a walk, but suddenly saw a familiar figure in the corner.

Yanda's cold water steamed bun professor, Wei Shen!

The Yanda professor of Liangshui Mantou, Gu Bai, has also seen it on the Internet. Aside from his countless trophies from elementary school to university, his talent in the field of mathematics is simply the top of Daxia.

Thinking of the reason why he could not leave without saying a word, Gu Bai walked towards the corner with champagne in his hand.

Wei Dongyi, who wrote lines of mathematical formulas in a notebook with a black pen, did not notice that there was a person standing behind him.

"This is the...ns equation.||?"

Hearing the sound, Wei Dongyi turned to look.

It's a young man, but I don't know him. Wei Dongyi smiled politely and said, "Well, may I ask who you are?"

"Gu Bai from Linhai University." Gu Bai smiled and introduced himself.

Gu Bai?

Wei Dongyi snorted lightly, looked at Gu Bai, and said, "It turns out that he is a big man in the field of prime numbers.

"What a big guy, it's just luck." Gu Bai said modestly.

There are many branches of mathematics, such as algebra, number theory, geometry, topology, analysis, function theory, combinatorics and so on.

The big man in the field of prime numbers that Wei Dongyi said is actually a small branch of the field of number theory.

But there is one thing Wei Dongyi understands wrong, Gu Bai is not limited to this field of prime numbers in number theory. In mathematics, Gu Bai is omnipotent.

After chatting a few times, Gu Bai found that this Wei Shen was not as bad as he said on the Internet.

At least when it comes to the knowledge of mathematics, it is eloquent. . . .

"Are you also interested in the NS equation?" Eventually, Wei Dongyi's topic shifted to the notebook in his hand.

The NS equations, or Navier-Stokes equations, are equations of motion that describe the conservation of momentum for viscous incompressible fluids.

With a smile, Gu Bai did not answer Wei Dongyi's words directly, he pointed to the mathematical formulas in Wei Dongyi's notebook and said with a smile: "I understand a little bit, but, because the N-S equation has one more than Euler's equation? △ 2 Derivative term, therefore, it is more troublesome to decipher..."

At the beginning, after Gu Bai cracked the "Zhou Conjecture", he also tried it in the library...

As a result, it goes without saying that Gu Bai's current math Lv4 ability is not enough to solve this problem.

"6" is more than trouble, this? △The second-order derivative term makes the NS equation extremely variable, and it is difficult to obtain the exact solution of the equation except under some specific conditions.

"Of course...Under certain conditions, it cannot be solved with mathematical formulas..."

Wei Dongyi pointed to the process of his calculations on the notebook, frowned and said.

Obviously, this difficulty is also an insurmountable difficulty for Wei Dongyi.

Of course, this is also the insurmountable problem for all mathematicians who study NS equations.

Glancing at Wei Dongyi's notebook, Gu Bai smiled and said, "What if I told you that your idea would not work at all?

"What's the meaning?

"literal meaning.

Gu Bai paused and explained: "The NS equation is an equation of motion that describes the conservation of momentum of a viscous incompressible fluid. Obviously, a purely mathematical problem cannot be solved at all. So...you can try to combine it with a little physical knowledge.

Hearing this, Wei Dongyi frowned, thoughtful.

Gu Bai's words obviously gave him some ideas, but... then he shook his head again and said, "Physics is not my area of ​​expertise."

"I can teach you if I'm not good at it." I thought to myself, but I didn't say it.

Gu Bai stretched out his hand and said, "Give me the pen.

"Here." Wei Dongyi handed the notebook to Gu Bai.

[In the Cartesian coordinate system, the component form of the N-S equation can be expressed as: ??(?p/???+p?p/px+v?p/?y+w?p/?z )=??fx-?p/?x+p(?2p/?x2+?2p/?y2+?2p/?z2)....tick]

[...where ?? is the fluid density; V is the velocity vector, p, V, w are the velocity components of the fluid at the point (x, y, z) at time t, so... ]

Gu Bai wrote in his notebook his desire to understand the NS equation from a physical point of view, while Wei Dongyi, who was on the side, looked at the characters that kept appearing on the notebook, and his face gradually showed a touch of seriousness.

Gu Bai's speed is very fast and mixed with the knowledge of physics, Wei Dongyi did not dare to be careless, for fear of not being able to keep up with Gu Bai's rhythm.

But... as there are more and more formulas on the notebook, Wei Dongyi's brows are locked together, and a touch of shock gradually flows in his heart.

The young man in front of him is very strong.

Of course, it's not that Gu Bai has directly cracked the NS equation, but Gu Bai's jump in thinking and skilled use of mathematical formulas made him a little surprised.

He... In the past few decades, he has never seen anyone who can use mathematical formulas more proficiently than him.

Gu Bai...is the first.