Minutes and seconds passed.

Before you know it, more than an hour has passed.

However, immersed in the subtlety of that line, Xu Chuan did not notice how much time had passed.

He originally thought that the problem would not be difficult, but as the analysis deepened, the twists and turns of the road were far more complicated than he imagined.

However, partial differential equations are one of his best areas, and it is difficult for him to solve the problem of discontinuous solutions of nonlinear partial differential equations with high precision!

In this way, staying in front of the blackboard lasted for nearly three hours, and the equations on the blackboard were erased and written, written and erased many times, until the right hand held was sore and swollen, Xu Chuan finally stopped the pen in his hand.

His eyes fell on the blackboard full of calculations again, his eyes with a hint of aftertaste and thought, and a smile on the corner of his mouth.

The marker pen in his hand fell on the blackboard again, and the last line of mathematical formula was roughly engraved on it, and it was also engraved in his mind.

【n+1?n? (△t)=2λn?λn+1?λ(n)^a?1n+1......】

i.e. when the denominator function? When the formula is satisfied, (△t) can be obtained as 0

The numerical solution of nonlinear partial differential equations in high-precision format still contains high-precision information, which can be described by the contractility of the nonlinear solution operator!

For the problem of "high-precision format for discontinuous solution of nonlinear partial differential equations", it already has at least one high-precision format that can be generalized to the sense of "global error"!

Looking at the equation covered with moving blackboards on both sides, Xu Chuan breathed a long sigh of relief and returned the marker pen in his hand to the pen basket with satisfaction.

Turning around, he looked at the students standing behind him, smiled lightly, and said, "Do you understand?"

Hearing Xu Chuan's inquiry, several students looked sluggish, and they were almost stupid.

Do they get it?

I understand a sack!

This is a world-class mathematical problem, probably no less difficult than the Mersenne prime conjecture, which has existed for almost a hundred years since it was proposed in the thirties of the last century.

Three hours is not to take away the paper in your hand, but just the calculation process on the blackboard, and it will continue to wipe away the previous calculations over time, no one can understand it, right?

What shocked them even more was that their professor actually solved a world-class problem in three hours?

That's crazy, isn't it?

Coming back to his senses, Rong Xinji took a deep breath and asked with a little shock and hesitation, "Professor, you should have solved the problem of high precision for the discontinuous solution of nonlinear partial differential equations, right?"

Hearing this question, Xu Chuan smiled faintly and said, "It's just that a way has been found, and there should be other solutions to this problem."

Turning his head to look at the blackboard behind him, he continued, "The study of rigorous mathematical theories on the true meaning of the high precision of nonlinear equations is a very meaningful work."

"Its post-processing is of great value not only for mathematical numerical analysis and scientific computing, but also for physical mechanics, fluid mechanics and other application fields."

"Is there anyone interested in this issue that might be able to move on to this aspect?"

Hearing this, several students immediately fell silent.

Investigate a world-class math puzzle...... Is this what they should do for a Ph.D., master's student, or even an undergraduate?

Shouldn't their task at this stage be to study hard and fill in the self?

Challenge world-class math challenges, emmm..... That's a bit exaggerated, isn't it?

Looking at the few students who were silent, Xu Chuan smiled and said, "No one wants to try it? You can choose it as your graduation path."

In the office, there was still silence.

Seeing this, Xu Chuan shook his head lightly and sighed in his heart.

However, he didn't care too much, after all, it is impossible for every student to choose their graduation goal on world-class mathematical conjectures, and not everyone has such ability.

For the vast majority of math students, it is already excellent to be able to complete a high-quality Zone 1 SCI paper by the time they graduate.

In fact, for the vast majority of mathematics students, even master's students, and even some doctoral students, it is almost impossible to reach this level of graduation thesis.

Of course, he still has high requirements for the students he brings.

Although it is impossible to require every student to solve a math problem in order to graduate, it is necessary for him to be accepted into his disciple at least one top journal paper to get out of his hands.

Otherwise, he really can't afford to lose that person.

"Professor, can I try?"

At this moment, a voice was heard from several students.

Xu Chuan looked over, and it was Rong Xinji who spoke up.

Before Liu Jiaying's arrival, he was the youngest of four students, and he was only 23 years old this year, but he was already in his third year of graduate school and was about to graduate or study for a doctorate.

"Of course."

Xu Chuan nodded with a smile and said, "This problem is still difficult, with your current ability, I am afraid that it will take a lot of hard work to solve it."

After a pause, he then laughed, "Of course, you can choose to make it your PhD graduation goal, or you can choose to try it with others."

"Well, I'll try! Professor."

Rong Xinji nodded vigorously, with determination in his eyes.

Although his knowledge level and experience are still very immature academically, he didn't even understand even one-tenth of Xu Chuan's proof on the blackboard just now. But he was originally a gold medalist in Imo, and he was not bad at mathematics, and he has always regarded his mentor as an idol.

When I chose to study at NTU, I hoped to worship Xu Chuan and follow Xu Chuan. Now that he has got his wish, he doesn't want to graduate like this, no matter what, he has to make some achievements to be worthy of his efforts.

......

After giving a brief explanation of several students' winter vacation homework, Xu Chuan pointed out some books and papers for several students to read and study according to the answers in the homework.

For him, taking students has always been something he has done.

Although he sometimes ignores them for a relatively long time due to his busy research, he doesn't mind giving these students a few more lessons in person when he has time.

As for what these students can grow into in the end, whether they are dragons or insects, it depends on their own efforts and talents.

......

After simply arranging several students, Xu Chuan came to the Xinghai Research Institute.

After experiencing a Chinese New Year, the Aerospace Research Institute passed on a good news!

Their cooperation with NASA is negotiated!

On February 29, a special day that only happens once in a few years, a major event took place in the world.

At 12 o'clock at noon at different points in time on this day, the Xinghai Research Institute and NASA held press conferences respectively to publicly announce that the two sides had reached cooperation in space projects.

That is, NASA will borrow the Xinghai Space Shuttle from the Xinghai Research Institute to carry a group of engineers to the L2 Lagrange point, which is 1.5 million kilometers away from the earth, to repair the damaged James Webb Space Telescope.

As soon as this news came out, it immediately caused a violent sensation in the international community.

Because this is the first public cooperation between NASA and China in the true sense since 2011, after the United States passed the "Wolf Clause", countless people were surprised.

You know, even when Artemis planned to return to the moon last year and there was an accident with a manned landing on the moon, NAS

A did not take cooperation, but proposed a rescue operation to the Xinghai Research Institute in the form of international rescue through diplomacy.

It can be said that this positive cooperation has broken through the eyes of many people, and it has also reminded many people of the ASpt test project in the last century.

ASpt, the full name of the Apollo Alliance Test Program, was born in the seventies of the last century, and it was a space cooperation during the Red and Blue Cold War in the last century.

Although it was a tiny experiment at the beginning, it was a decisive step in the nearly two decades of space competition between the Red Soviet Union and the United States, and it was the first manned space mission in human history to be jointly carried out by two countries.

The success of the AStp project has set an important precedent. The handshake between the two superpowers over the nine heavens finally turned into a friendship, and the nearly 20-year space race came to an end, replaced by a series of new chapters in international space cooperation.

Although the cooperation of the Apollo alliance was more of a superficial step back and a brief handshake, no substantial progress was made.

Regardless, the foundation laid by that collaboration opened up the possibility of future collaborations.

In the following time, whether it is the space shuttle of the United States that visited the Mir space station of Tsarist Russia 11 times, or the construction and development of the International Space Station, it can be said that it all started with the Apollo Alliance cooperation project.

And now, almost the same background, the same antagonism, the same space race, the same two superpowers, what kind of sparks will be set off after the Wolf Clause is broken?

How the future development of aerospace will change and which country will occupy a dominant position are all things that countless people are looking forward to.

In any case, the current space race seems to have a hint of an end.

At least, at the moment when NASA is cooperating, the space hegemony that once weighed on the heads of countries has begun to dissipate.

......

The timing of Xinghai's trip to L2 to repair the Webb Space Telescope has been confirmed, and it will begin on April 15.

At that time, the space shuttle Xinghai will carry two NASA engineers + two tR engineers, and eight personnel from the Xinghai Research Institute to 1.5 million kilometers of outer space.

For the Star Ocean, this is also a test.

After all, it remains to be seen whether it will be able to complete its mission smoothly at such a long distance.

But if it successfully completes this work, the next manned fire project can also be put on the agenda.

Of course, for Xu Chuan, although this mission was important, he didn't pay too much attention to it.

Xinghai is a space shuttle designed by him himself, and although 1.5 million kilometers of space is far away, it is not its limit.

After all, theoretically, if the number of people on the planet is reduced to two, and the rest of the space is used to carry fuel and supplies, its range is enough to carry Jupiter, or even more distant outer space.

One and a half million kilometers, to put it mildly, is only enough for the Xinghai to warm up.

.......

At the same time, the other side.

University of Cambridge, Cambridgeshire, Europe.

In an English-style dormitory, a girl is holding a towel and wiping her wet hair as she walks towards her bed.

When passing by her roommate, she stopped, glanced curiously at her best friend who was busy revising the paper in her hand, and asked.

"By the way, Xiaoxiao, how is your paper?"

In front of the desk, Xu Xiao, who was revising the paper, replied without raising his head, "It's almost done."

"Huh?"

Hearing this, the girl who was about to climb up the small stairs to the bed was stunned for a moment, stopped, and looked over with some surprise: "It's done? It can't be, right? I remember you didn't make any progress until you got home."

Xu Xiao glanced at the paper, took a deep breath, and said, "Yes, it's done."

"Did you find someone to help you?"

The girl asked curiously, and then said to herself, "But even if someone helps, it's only been a month, how can it be so fast?" I remember you contacted Professor Pierre-Louis Lyon before, and didn't he say that it would take at least half a year to do it?"

Hearing this, Xu Xiao was silent for a moment, and then said, "A month? In fact, it only took him three days to solve my problem."

"Three days? How is this possible?"

"Professor Leon was a Fields Medal winner in '94 and has a deep research in functional analysis and quantum mechanics. Even he said it would take at least half a year to do it, three days, is this still human?"

"Can you tell me who you found to help you solve?"

The girl seemed surprised, and a series of words and questions came straight to her.

In front of the desk, Xu Xiao was also silent for a while, not only others, but even she herself was completely shocked when she knew about it.

The University of Cambridge is not without great people, such as Professor Pierre-Louis Lyon, whom they just talked about, who was the Fields Medal winner she once went to.

But it is clear that there is also a gap between the winners of the Philippine Prize.

In front of her own brother, I'm afraid that most of the Filipino Award winners are nothing.

Although she was shocked when she thought of this, she was very angry when she thought of it!

That guy actually sent her the paper as a New Year's gift on the first day of the new year! Not to mention that she was doing research on the first day of the Lunar New Year, she didn't even grab the red envelopes in the prestige penguin group!

It's just disgusting!

........

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