Department of Mathematics, Peking University,

As one of the best universities in the country for mathematics, there are countless so-called mathematical geniuses in this department. If this department is only ranked second, then no mathematics department of any university dares to say that it is first. It is so awesome.

existence.

Two hundred undergraduate students are admitted here every day, half of whom are admitted through competitions. Almost all the domestic contestants who have won gold medals in international and domestic mathematics Olympiads are here. It is also known as the head of the four crazy departments.

In addition to the geniuses who are originally in the Department of Mathematics, there are also many students from other majors who come to study, such as the Department of Computer Science, Economics, Physics, etc. Those who are outstanding in their respective departments come to the Department of Mathematics from time to time for related studies.

The students who study here are divided into four classes according to competition recommended students and college entrance examination students. It can be said that... the competition is very strong and there is a lot of pressure here, but as long as he can survive here, then he is not an ordinary student.

people.

It is also for this reason that geniuses and masters gather together, and almost all of them are concentrating on studying hard. After graduation, the vast majority of students will choose to go abroad to continue their studies, and then... only 20% of them come back.

.

Five hundred people go out every year, and only less than a hundred come back. After obtaining a doctorate abroad, many choose to stay and work. Some of the particularly outstanding people have become university professors or associate professors, while the middle-level ones have become university professors or associate professors.

The company holds important positions.

For example, mathematical principles play an important role in price models, statistical analysis, financial products, optimal investment portfolios and other fields. However, if Chinese people are good at mathematics, it is normal in the eyes of foreigners. If they are good at mathematics, they are not Chinese.

However...

at this moment,

The Department of Mathematics at Peking University encountered a big trouble. Almost everyone in the department was trapped and died, and this problem occurred only five minutes ago... Professor Zhang Yaying is a professor in the Department of Mathematics at Peking University and a member of the Department of Science and Technology.

Academician of the academy.

He serves as an injector of international mathematics research institutions, director of the Mathematics Development Laboratory, director of the Mathematics Association, editor-in-chief of seven top domestic and foreign journals, and has made contributions to Riemannian manifolds and z-functions. In short...he is Hua Guo

The limits of mathematics.

There should have been nothing wrong at first, but... Zhang Yaying received a call from Xiao Sun, the head coach in charge of training the national team for the mathematics competition. Associate Professor Sun explained to Zhang Yaying the current problems.

"Academician Zhang..."

"We can't even understand this question... It seems to be a physical phenomenon, but it needs to be expressed in non-Euclidean geometry." Associate Professor Sun smiled bitterly: "By the way... Academician Xu Mang is at our training base,

It was he who raised this problem, asked us to solve it within four hours, and asked anyone for help."

"Xu Mang?"

"Yes... he is the consultant of the national team for this mathematics competition." Zhang Yaying said helplessly: "What is the problem? Send me a photo and I will show you... Is it really so difficult?

Can’t even understand? This is a bit exaggerated.”

"No no no!"

"Academician Zhang...Academician Xu Mang is not an ordinary person!" Associate Professor Sun said seriously: "You think he won the Nobel Prize in Physics at such a young age. I think this year's Nobel Prize in Physics should also be given to him, after John

After Bardeen and Fred Sanger, he is the third person to win this honor consecutively in the same field."

"It shows how powerful he is, and his research results are all based on theory and mathematical calculations..." Associate Professor Sun explained: "It shows how powerful Academician Xu Mang is in mathematics, but... I asked him,

Why not study mathematics."

"..."

"Everyone knows this. He doesn't like mathematics. He is forced to learn mathematics just because theoretical physics requires mathematics." Zhang Yaying said with a smile: "When I heard this, I was quite angry... Now I think about it.

Xu Mang’s.”

"actually..."

"There are deeper reasons." Associate Professor Sun said: "According to Academician Xu Mang's explanation, it was all because his wife held a kitchen knife on his neck... and had to participate in the so-called competition with him.

, but was forced to learn mathematics.”

"..."

"This... forget it." Zhang Yaying said hurriedly: "Send your question and I will study it."

hang up the phone,

In less than thirty seconds,

Zhang Yaying received an email with a picture attached. She only glanced at it briefly and didn't find it difficult. However, when she officially entered the solution process, she realized how hasty the previous glance was.

This question...

Not simple!

It is not something that can be understood at first glance, and many issues need to be considered... In short, translated, it is to describe physical phenomena into precise mathematical equations.

"this..."

"Is this too much for college students?" Zhang Yaying frowned, full of doubts about this problem. Its difficulty far exceeds what the contestants can solve, and it is more focused on practical applications.

but...

Since Xu Mang said that he could find anyone to solve the problem, was he challenging the Department of Mathematics at Peking University?

for a time,

Zhang Yaying ignited a fighting spirit. She hadn't competed with others for a long time. When he was studying, his favorite thing was to compete with others. Now that he was in this position, he didn't even have the chance to compete, but Xu Mang gave him such a chance.

soon,

This fire of fighting spirit is a little dim,

It's so difficult...

"Hello?"

"Lao Yi!"

"I have a physics problem here that is now described as a mathematical equation. Let's solve it together!" Zhang Yaying said: "Please help me find out what physical phenomenon this is. It seems to be a problem of curve description of extreme space and time."

"Well?"

"Have you studied physics?" The other party said with a smile: "Show me!"

moment,

The man named Lao Yi called Zhang Yaying back, his tone was quite serious.

"Old Zhang!"

"Who are you helping to solve this problem?" Lao Yi asked: "This problem is not ordinary... From a simple understanding point of view, it involves the concept of four-dimensional space and time... and it has a decent shape... this...

.The other party is not an ordinary person, right?"

"..."

"It's Xu Mang."

"He was at the mathematics competition training base, and then he gave the contestants a problem to solve in four hours, and at the same time he asked anyone to help." Zhang Yaying said helplessly: "I think this is a challenge to us.

"

"he?"

"He asked your players to solve this problem?" Lao Yi said confusedly: "This is obviously targeting your mathematics department!"

"In that case..."

"Then I can't help anymore!" Lao Yi showed a smile: "But I can't solve it, you can figure it out yourself. This is completely divorced from physics. It is a pure mathematical problem, very pure... so pure

No knowledge of physics is required.”

hang up the phone,

Zhang Yaying fell into silence. If he was given a few days, he might be able to solve it, but with only four hours, it is so harsh that he cannot speak. This is unfair...unless the equation of this problem is extremely simple.

Is it possible?

The questions Xu Mang gave cannot be about addition, subtraction, multiplication and division.

soon,

Zhang Yaying found several other professors in the Department of Mathematics to study this problem together. However, after half an hour, they came to the conclusion that it could not be completed in a short time. It would take at least two weeks or even use a computer.

"Academician Xu Mang has posed a difficult problem for our Department of Mathematics!" A professor sighed: "He has wanted to do this for a long time, right?"

"he..."

"It's hard to say... Although we have no interaction with each other, I heard from other people that Academician Xu Mang is quite strange." Another professor said: "He seems easy-going, but in fact he is very stubborn and has a bad temper. Listen,

He said that he rejected many preferential policies for him."

"He has the capital to refuse." Zhang Yaying said: "He won the Nobel Prize in Natural Science at such a young age, and it was also the first natural science prize in our country. Coupled with his age... I can't see it now.

His height, because now is just the beginning."

"alright!"

"Let's continue!" Zhang Yaying said seriously: "Our mathematics department at Peking University is number one in the country, and we cannot be defeated by a physics student."

At this time,

I don’t know who leaked this problem. The students in the entire mathematics department have gone crazy over this problem. After all, it was proposed by Xu Mang. If anyone can solve it, then this person will definitely be among the masters.
To be continued...