An interview lasted for more than half an hour.

Originally, in Director Xiong Weizhao's plan, this interview was about an hour, but considering that Academician Xu needed to take the high-speed train back to Jinling, he still compressed a lot of time and erased some problems.

After the interview, Xu Chuan took his luggage, said goodbye to the two and set out on the way home.

Standing at the door of the Beihai Hotel, Xiong Weizhao looked at the back of Xu Chuan leaving in the vehicle and felt a little emotional.

I have worked in CTV TV for so many years, and I have interviewed and met countless scientific researchers, scholars and even politicians, but it is the first time I have seen such an excellent person as this one.

There are many academician-level scholars, but like this one, a scholar who can reach the heavenly hall and can directly affect the development of the entire country and even the world, I am afraid that this is the only one in this society.

Looking at the back of the departing vehicle, he suddenly turned his head, looked at Sun Yutong who was standing beside him, and said with a kind smile: "Yutong, I didn't expect you to have such a good relationship with this Academician Xu, remember to contact more in the future." ”

Sun Yutong looked at the departing vehicle, and then at the director, and for a while he didn't know what he was thinking.

Contact?

When it comes to contact information, it's not that she doesn't have any.

As early as a few years ago, when she went to Sweden for the first time to participate in the Cafford Prize, she added the contact information of this academician Xu when she did an interview.

It's just that in the past few years, apart from some polite greetings on the holiday, there has been little contact between the two.

To be honest, as a girl, at her age, it's normal to think about your other half.

It's just that her vision seems to be a little too good.

Before she could attack, the other party had already reached a height that she couldn't reach.

If she wants to try again, I'm afraid she doesn't think she can have the courage herself.

It was quite late to return to Jinling from the capital.

After taking a shower, Xu Chuan dried his hair and sat in the study.

Although I haven't been back for a few days, the villa is still clean, not even a little dust. Probably when he's out of the house, there are still people who come here every once in a while to clean up or something.

Turning on the computer, he clicked on the documents that had previously recorded various work, recorded the relevant matters in the near future, and then began to make arrangements for the next work and research directions.

Now that the controlled nuclear fusion technology has been realized, he has planned the next goal, but on the whole it is still relatively rough.

As for now, it's time to recreate a new plan for yourself.

After resting for such a long time, it's almost enough.

After all, the brains of a scholar, or a researcher, cannot be wasted for too long.

After thinking for a moment, he opened his notebook and wrote down the terms mathematics and space engines.

Mathematics is his own path.

In any case, even if controlled nuclear fusion technology is realized, Xu Chuan is not ready to give up the field of mathematics.

Instead, over the next few years, he will focus more on mathematics.

Despite the fact that he has solved two millennial problems, he still has a lot of areas to learn that he has yet to set foot in.

As for space engines, there is no doubt that this was prepared for a breakthrough in space technology.

After the realization of controlled nuclear fusion technology, the step into the sky is a must.

However, judging from the current situation, whether it is China, the United States, or the European Union and other countries, there has not been much progress in aerospace technology.

If you want to talk about the pinnacle of aerospace, it can even be attributed to the famous 'Cold War' in the last century.

In that turbulent but competitive era, aerospace ushered in the most glorious moment in human history.

Launch vehicles, unmanned lift-offs, manned moon landings, space shuttles, and the Saturn 5 super-heavy launch vehicle were all created at that time.

But now decades have passed, and the space technology of various countries is still hammering and patching on it. Not to mention moving forward, it is even possible to go backwards.

As early as a few decades ago, Sumidu achieved a manned landing on the moon, but decades have passed, and the manned landing on the moon is no longer in the plans and arrangements of various countries.

Of course, this is also related to the delay in making a breakthrough in space engine technology.

In many science fiction or science fiction movies, the aircraft always provides power for the entire interstellar journey.

But in reality, the engine technology of rocket thrusters simply cannot achieve this.

The engine of a chemical rocket looks small compared to an exposed propellant tank, but it has a great appetite.

"I eat a lot, but I don't work very efficiently."

Conventional fossil fuel engines need to devour a huge amount of energy, but they are only effective in providing short-term power – the stored fuel runs out quickly, and the thrusters are immediately thrown away as garbage.

Most of the fuel for the chemical rocket is used to escape the Earth's gravity, and the remaining bit is used to propel the rocket's "space glide". The rocket flies to its destination, relying solely on inertia.

For interstellar flight, this engine is clearly not enough.

Take the famous "Saturn 5 launch vehicle" as an example.

It is a super-heavy launch vehicle developed by the United States, known as the most powerful rocket system in history.

However, with a height of 110.6 meters, a diameter of 10 meters, and a thrust of 3,408 tons, it can only carry 118 tons of objects into low-earth orbit, and if it is to be sent to lunar orbit, the load will be drastically reduced to 45 tons.

The reason for this is that of the nearly 3,500 tons of thrust generated by the rocket, a significant part is used to "tow" the rocket itself and more than 2,000 tons of fuel.

Its "specific impulse" is not high, only more than 300 seconds, indicating the low efficiency of its propulsion.

That is why to send a person with a small mass into space, it is necessary to use a huge rocket.

If this traditional fossil fuel rocket is still used as a carrier, I am afraid that there is no way to make much breakthrough in space technology.

So Xu Chuan wanted to focus on this aspect of the study to see if he could find a new path for space engines.

Sitting in front of the computer, Xu Chuan thought about the new path of the space engine, and before he knew it, the night was getting deeper.

As the moon climbed overhead, the cell phone on the table rang.

Xu Chuan picked up his phone and looked at it, it was his new life assistant who sent it.

"Academician Xu, it's getting late now, if you don't have anything urgent, it's time to go to sleep."

Looking at the information, the corners of Xu Chuan's mouth moved, and he looked at the time again.

Well, before you know it, it's eleven o'clock in the evening.

Shaking his head, he put down his phone, sorted out and saved the information on the computer, and got up to wash.

Is this the magic of life assistants?

What are the scientific researchers who can't realize the freedom to stay up late?

After sleeping peacefully, the next day, Xu Chuan came to Nanda.

Now that the controlled nuclear fusion technology has been realized, as a full professor at NTU, it is time for him to come back to class and take the students.

Pushing open the door of the office, Xu Chuan walked in, and Cai Peng, who was studying on his own in the office, turned his head to take a look, and quickly stood up in surprise and excitement.

"Professor, you're finally back!"

Finally, Xu Chuan coughed a little unnaturally, facing Cai Peng, a student, he was probably a little embarrassed.

After all, he has been accepting people as students for almost two years, and he has not taught him much, and he was busy with things in the field of controlled nuclear fusion before, and Cai Peng basically threw them to Gu Bing and Amelia to teach.

On the other side, Cai Peng may also realize that he said the wrong thing, so he quickly skipped the topic, and then congratulated: "Professor, congratulations on solving the problem of the century of controlled nuclear fusion!" ”

Xu Chuan: "Thank you, why didn't you see Amelia?" ”

Hearing this, Cai Peng's expression was a little strange: "Professor, in February this year, didn't you arrange for her to go to CERN for an internship, and she hasn't come back yet." ”

Xu Chuan coughed for a moment, and then remembered that because he was busy with controlled nuclear fusion before, he was afraid of delaying the students, so he arranged Amelia to practice at CERN.

Amelia studied mathematical physics, and after solving Bloch's conjecture, she graduated from him with Gu Bing.

It's just that Gu Bing chose to be a professor of mathematics at NTU, while Amelia was more talented and chose to learn mathematics and calculate physical particles with him.

This is a course that requires a combination of practice and theory, and it is not possible to provide great help in this direction in China for the time being, so he sent Amelia to CERN and asked his mentor Edward Witten to help take care of it.

Then the school left Cai Peng, either to study by himself or to study with Gu Bing.

Speaking of which, he's quite sorry for these students, who spend most of their time in free-range mode.

Coughing lightly, Xu Chuan said, "Next, I will have enough time to teach you, I hope you haven't fallen behind in your homework in the past two years." ”

Hearing this, Cai Peng suddenly felt a little bad.

From Senior Brother Gu Bing's mouth, he knew that this tutor was the master of the student's graduation thesis who dared to take a world-class problem, should he also solve a world-class problem in order to graduate from him?

If that's the case, then it might as well kill him, maybe that would be easier?

Xu Chuan didn't care about the changing expression on his student's face, and then asked, "I remember that you studied in the field of differential equations later, right?" ”

Cai Peng quickly replied, "Yes, Professor." ”

Xu Chuan nodded, didn't say much, took out an A4 paper from the drawer of his desk, and after thinking for a while, he started writing and wrote:

"Let K be a zero-feature differential domain, ={δ1,····,δm} as its differential operator, and let L = Khη1··· ηni is the differential expansion domain generated by K and finite elements η={η1,····,ηn}. ”

"The definition is expressed in terms of Θ for δ1,···,δm resulting from the free commutative semi-group. If r is any non-zero integer, let Θ(r)=δk11··· δkmm∈Θ|mXi=1ki 6 r”

"Question 1: Seek an algorithm that can determine the differential generation set η of a known differential expansion field L over K."

"Question 2: Seek an algorithm that can generate a set and the differential relation of this set from a known differential expansion field L on K, and calculate the minimum differential dimension polynomial of L/K."

In the quiet of the office, the sound of a ballpoint pen sliding on a white manuscript paper stands out. Cai Peng listened to the voice and couldn't help swallowing his saliva.

He seemed to be a little panicked.

After less than two minutes, Xu Chuan got up and handed the manuscript paper to Cai Peng.

"Although I haven't been able to teach you well in the past two years, it's my dereliction, but let me see if you have wasted your talent and homework in the past two years."

"The problem on this piece of paper should be suitable for you, I will give you three days to solve as much as you can, including thoughts and ideas."

"If you've been lazy in the past two years, if you want to graduate from me, I'm afraid you'll have to delay it for a while."

PS: Make up for yesterday's chapters, there are still two more today, ask for a monthly pass.