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Chapter 130, "Thermodynamic Limits and Boundary Energy of Symmetry-Broken Integrable Models" (Subscribe)
On Yuquan Road in Beijing, in the president's office of the Graduate School of USTC, Wang Duoyu was communicating with Qian Xuesen and Yan Jici.

To be precise, it was Wang Duoyu who asked Qian Xuesen questions.

In order to meet Qian Xuesen, Wang Duoyu listed all the questions he had prepared, which he had discovered in his previous research on quantum integrable systems, and then wrote them down.

During the entire communication process, Wang Duoyu was very happy and had a smile on his face the whole time.

Qian Xuesen is worthy of being a big name in the field of physics, and he is proficient in many physical theories.

When Qian Xuesen learned that Wang Duoyu was also planning to compile aerospace textbooks, he gave him a thumbs up.

"Excellent! Our country needs more young people like you."

After praising Wang Duoyu, Qian Xuesen asked him if he had encountered any problems in compiling these textbooks or if he needed any help.

Aerospace professional textbooks cover many aspects, especially in aircraft design, flight mechanics and structural mechanics, electronic systems and manufacturing technology, and the requirements are very high.

"Professor Qian, to be honest, I'm just conducting research on the fundamentals. To be more precise, I'm categorizing and organizing this basic knowledge. It's far from being a textbook."

Wang Duoyu heard this and said modestly:

"But when it comes to helping, it really happened."

"Oh, you say." Qian Xuesen said with a smile. Yan Jici next to him didn't say anything, but he was smiling, obviously very satisfied with Wang Duoyu.

Through communication, both Qian Xuesen and Yan Jici knew that Wang Duoyu's research direction was very confusing!

Sometimes it is theoretical research in the field of pure mathematics, such as the paper he previously published in the journal "Science China·Mathematics", especially the paper proving the Poincare conjecture in four-dimensional space. It can be said that Wang Duoyu has achieved the ultimate in the direction of pure theoretical mathematics research.

Such talents should continue to conduct in-depth research on these cutting-edge sciences, just like Chen Jingrun and others.

However, Wang Duoyu started to study the mathematics, physics and mathematical physics related to quantum integrable systems, and his ambition was very great.

That would have been fine, but Wang Duoyu actually wanted to achieve something in aerospace, otherwise he wouldn't have been so proactive in compiling textbooks.

Both Qian Xuesen and Yan Jici knew that Wang Duoyu was a genius, but being good at mathematics did not mean he was also good at physics.

Moreover, the fields he involved were all very cutting-edge scientific research fields, and many people might not be able to gain anything even if they spent their entire lives on them.

Could Wang Duoyu really achieve the ultimate?
However, this was the path Wang Duoyu chose himself, and Qian Xuesen and others could not persuade him.

Besides, they are not the ones who should talk about these things with Wang Duoyu.

"Thank you, Professor Qian. That's right. I hope that after I have sorted out all my notes, I can give them to you to help me sort them out. If there are any mistakes or inaccuracies, I hope you can help correct them."

After hearing what Wang Duoyu said, Qian Xuesen nodded repeatedly, indicating that there was no problem.

Qian Xuesen could not refuse such a request.

He himself does not have time to compile aerospace textbooks, but he definitely has time to help review them.

After finishing the communication with Qian Xuesen, Wang Duoyu returned to the Computing Center to help Feng Kang solve the problems in their Computing Center, and then the only thing left was the lecture.

In the past two days, in addition to staying in the Computing Center, Wang Duoyu came to the Graduate School of USTC today to communicate with Qian Xuesen.

Liu Xiaoli is about to leave the capital this afternoon and prepare to return to Jiangcheng.

At Beijing Railway Station, Liu Xiaoli boarded the train and prepared to leave.

She looked at Wang Duoyu reluctantly. In the past two days, she could clearly feel Wang Duoyu's alienation towards her. She was very uncomfortable, but she couldn't agree immediately.

She herself was also very conflicted. On the one hand, she really wanted to agree, but when she thought about the fact that if she agreed, she might really have to become a full-time housewife, this was not the life she wanted.

On the other hand, she is still young and she feels that her career can still develop and move forward.

The train whistled and started slowly.

Wang Duoyu watched Liu Xiaoli leave with a smile, without any reluctance.

After seeing Liu Xiaoli off, Wang Duoyu returned to the courtyard house at No. 87 Zhongguancun West Street, added some honeycomb coal to the stove, and then went back to the room to continue writing his thesis.

Taking advantage of the fact that he had no books on aerospace and that his communication with Qian Xuesen had just ended, he prepared to write a paper.

The paper he wrote, "Thermodynamic Limits and Boundary Energy of Symmetry-Broken Integrable Models", is a physics paper. Integrable models with broken symmetry are widely present in physics, such as systems where the number of particles is not conserved, systems where the boundary fields at both ends are not parallel, and systems with topological boundary conditions.

Based on the connection between the spin chain model and the asymmetric repulsion process, a rigorous solution to the asymmetric repulsion under arbitrary boundary conditions can be given.

The main research objects of this paper written by Wang Duoyu include the spin chain model and supersymmetric tJ model in condensed matter physics and the asymmetric repulsion process in non-equilibrium statistical physics.

He wrote on the white paper:

"We first gave the thermodynamic limit and boundary energy of the spin-1/2 isotropic spin chain model under general boundary conditions, providing new ideas for solving similar problems."

It took Wang Duoyu a day and a half to finish the paper.

A physics paper is different from a mathematics paper. There is still a lot of information that needs to be consulted, so it is not possible to just pick up a paper and a pen and start working like a mathematics paper without having to think too much.

However, Wang Duoyu believed that as long as he read enough books and conducted in-depth research, he would be able to write similar simple physics papers with ease in the future.

No. 87, Zhongguancun West Street was already Wang Duoyu's home. Uncle Zhang had already moved out. The day after he moved out, Wang Duoyu and Liu Xiaoli moved in.

In his previous life, he lived in the capital for many years. He was very familiar with the place and was also accustomed to the climate here.

Look, at this time in February, a sandstorm is about to hit the capital, and he plans to leave the capital as soon as possible after finishing the lecture.

But unfortunately, this morning, when he was about to go to the Graduate School of USTC, Yan Jici sent someone to inform him that the lecture might be cancelled.

"why?"

"It's like this, Mr. Wang, Principal Yan told me that your lecture has been leaked in the past two days. Several schools such as Peking University and Tsinghua University also want to attend. The number of applicants is too large, so this lecture has to be temporarily canceled."

After a pause, the teacher from the Graduate School of USTC continued:

"Principal Yan said he's already discussed this with leaders from Peking University, Tsinghua University, and other universities. He plans to hold this lecture again in two days. Principal Yan will come personally to apologize to you this afternoon."

Wang Duoyu was speechless when he heard this.

He knew that this matter was not that simple, but he didn't expect that something really would happen.

After Feng Kang learned about this, or after Yan Jici made this request, perhaps there were already signs of this happening.

But after calming down, Wang Duoyu suddenly shook his head and laughed, because even if there was no incident with Principal Yan, there would be other things.

From last November, when the paper was published, to now February, most people who wanted to attend the conference have probably already read the paper.

Those who can understand it have probably already understood it, and those who can’t understand it are definitely still slowly working on it.

However, for people like Peking University President Zhou Peiyuan, USTC President Yan Jici, and Tsinghua University Secretary Liu Da, the serious matter is to help more students understand Wang Duoyu's paper.

We cannot just ignore it just because students cannot understand it.

If this is true, then won’t many people miss the report meeting in April?
Therefore, even if it was not Yan Jici who proposed to hold a lecture this time, it would probably not be long before Zhou Peiyuan or Liu Da would also propose it.

In short, Wang Duoyu can't escape.

In the Institute of Mathematics, Tian Shouzhong was still busy with calculations. At this moment, Tao Fangqi appeared at the door.

"Everyone, I'd like to inform you that there will be a mathematics lecture at Peking University at 2:00 PM tomorrow. Wang Duoyu will be the lecturer. The topic is "The compact four-dimensional manifold of a four-dimensional sphere is actually topologically equivalent to this four-dimensional sphere." If you want to sign up, please come to my office immediately."

Tao Fangqi gave a notice and then left.

He was just making a casual announcement, and there would be another announcement later. After hearing this, Tian Shouzhong was stunned for a moment and didn't react for a long time.

After he realized what was happening, he quickly got up and walked out. He was going to Tao Fangqi's office to register.

Just as he was about to leave, a notification was broadcast and all the researchers in the Institute of Mathematics heard it.

After hearing the announcement, several graduate students from the Institute of Mathematics, including Qian Xiaohong, Li Jiahang, and Lu Wanjie, quickly got up and ran to Tao Fangqi's office to sign up.

When Qian Xiaohong and others arrived at the office door, there was already a line, and there were quite a lot of people who wanted to sign up.

Seeing this, Li Jiahang couldn't help but complain to Lu Wanjie next to him:
"Why are they suddenly holding lectures? Didn't they say the academic conference would be held in April?"

"Who knows?"

As soon as Lu Wanjie finished speaking, Tian Shouzhong, who was queuing in front of him, turned around and responded:
"It must have been prepared in advance to accommodate those of us who struggled with the paper. They hoped everyone would be able to understand it."

The Poincaré conjecture is of fundamental significance in topology, changing our understanding of the classification and characteristics of closed surfaces. At the same time, the application of the Poincaré conjecture is mainly reflected in fields such as string theory and quantum gravity theory.

When these theories deal with the curvature of high-dimensional space and time, the conclusions of the Poincare conjecture can provide important theoretical basis and guidance.

Therefore, studying the paper "The compact four-dimensional manifold of the four-dimensional sphere is actually topologically equivalent to this four-dimensional sphere" is a very important topic for most mathematical researchers.

Moreover, for most researchers, such academic conferences are rare opportunities.

Therefore, if you have the opportunity to read the paper before the lecture, or listen to the lecture twice, wouldn’t your understanding of the paper be deeper?
The National Science Conference held in March last year and the reform and opening-up policy finalized in December have fully demonstrated that mathematics will become the most important basic education in the future.

Mathematics is the foundation of all disciplines, and the study of theoretical mathematics is of paramount importance.

The higher-ups have shown such strong support, and leaders like Hua Luogeng, Zhou Peiyuan, and Duan Xuefu will certainly do their utmost to support them. So isn't it normal to invite Wang Duoyu to give a lecture in February?

What Tian Shouzhong said made a lot of sense, and Qian Xiaohong and the others couldn't help but nod in agreement.

But just when the Institute of Mathematics was busy with registration, Wang Duoyu was also in Xia Peisu's office at the Institute of Computing Technology, and was scolded several times by Liu Deben on the other end of the phone.

why?
Since he was giving a lecture at Peking University, why didn't he tell Harbin Institute of Technology in advance?

Now look what’s wrong, Harbin Institute of Technology is definitely going to miss this lecture.

Wang Duoyu had no choice but to say that he would find time to talk to everyone about it after he returned to school, but he had to make sure that everyone had studied the paper, otherwise his talk would be in vain.

After finishing the call with Liu Deben, Wang Duoyu looked at Xia Peisu with resentment and said:

"Professor Xia, you've really screwed me over. I was hiding at home and doing nothing, but after hearing what you said, I can't rest anymore."

Upon hearing this, Old Lady Xia smiled with schadenfreude and said:

"Don't think I don't know. You've been pretty free these past couple of days. I heard you even went on a date, didn't you? Young man, even though you're young, you should focus on scientific research and stop being lazy."

"Also, did you submit another physics paper recently? Tell me, as a mathematician, what kind of person is it to be so idle all day long?"

Wang Duoyu immediately asked back:

"In that case, I'll withdraw from the high-speed array processor project."

"How can this be the same?" Xia Peisu suddenly became anxious.

The high-speed array processor project is originally an applied scientific research project related to mathematics, not physics or other scientific research fields, so there is no need to divide it so clearly.

The functional programming that Wang Duoyu brought up last time is a very good programming method. Xia Peisu believes that once project members like Shan Yunbo have learned functional programming, the efficiency of subsequent programming work will be greatly improved.

You know, high-speed array processors inherently require a lot of "numbers", that is, memory.

This also means that more programmers are needed to complete the programming of these memories, which is a very tiring job.

If everyone was as professional as Wang Duoyu, able to type blindly, and also able to develop methods like functional programming, then the high-speed array processor project would definitely not take so long.

After chatting with Xia Peisu for a few words, Wang Duoyu quickly slipped away.

In the evening, as it was getting dark, Wang Duoyu and Zhu Ling were having dinner at a restaurant near Wangfujing Street.

While eating, Wang Duoyu suddenly said:

"Zhu Ling, what do you think about me buying an apartment in Beijing?"

"Of course it's great, are you finally planning to buy a house here?"

Upon hearing this, Zhu Ling was overjoyed. She stopped eating and stared at him intently.

She is twenty-seven years old this year and is getting older. Her parents urged her several times during the Spring Festival.

She's now a little depressed.

Just before the Spring Festival, she contacted Wang Duoyu through letters, and the latter pretended not to understand what she meant, which was considered a polite rejection of her.

Now, Wang Duoyu actually took the initiative to propose buying a house in Beijing. Isn’t this just because he wants to have a home in Beijing?

"Well, I've been coming here frequently on business trips for the past six months, and I'll be back again in April."

Wang Duoyu said with a smile that it would be funny if Zhu Ling also rejected him.

Since divorcing his ex-wife in May last year, Wang Duoyu has met Zhu Ling and Liu Xiaoli. They have been entangled for more than half a year and still haven't decided who to marry.

Liu Xiaoli was willing to have a child, but she was not very willing to stay with him as she was more career-oriented.

Zhu Ling, on the other hand, was not very willing to have children and wanted to stay in Beijing, but she was more willing to listen to Wang Duoyu's advice in other aspects.

But what Wang Duoyu wants to find is a wife who is good-looking, well-educated, and willing to "follow the man wherever he goes", rather than a partner who goes against him on many important things.

Getting married and having children are important matters of human relations. Although Wang Duoyu has no descendants to inherit the throne, without children, he will probably be more lonely when he is old.

Ugh!
Therefore, to be precise, neither Zhu Ling nor Liu Xiaoli is suitable for Wang Duoyu.

"Great, what kind of house do you want to buy? Do you have enough money?"

Upon hearing this, Zhu Ling smiled happily and kept asking questions.

Since Wang Duoyu already wants to buy a house in Beijing, we certainly cannot discourage her enthusiasm, and she is also willing to take the initiative to provide help.

She just snapped her little fingers and said:
"I still have three hundred dollars here. You can use it to buy a house first."

Hearing her words, Wang Duoyu smiled and shook his head and declined: "I have money, you know, I have the royalties from my previous writings, and I also have an internship position as a researcher at the Institute of Mathematics, so I have saved a lot of money, which is definitely enough to buy a house."

"No, I will definitely provide you with some financial support if you want to buy a house." Zhu Ling disagreed and said fiercely:
"Although I don't have much money, I can only take out three hundred yuan, but you must keep it!"

She had given Wang Duoyu a watch before, but she didn't expect that he would give her a bicycle in return.

Giving gifts to each other makes everyone fair.

This time, Zhu Ling really couldn't come up with more money to buy a house.

Of course, three hundred yuan is not a small amount of money. If you are in the suburbs of Beijing, then buying a smaller rural yard for a few hundred yuan should be no problem.

But if it is in the city, it will probably cost thousands of dollars.

"What if I don't accept it?" Wang Duoyu asked with a smile. Zhu Ling's eyes widened immediately and she said fiercely, "You dare?"

(End of this chapter)