Chapter 221 Participating in the Annual Meeting of China Aerospace Science and Technology Corporation
The news that Xu Yuan was going to hold an open class quickly spread throughout Qinghua University and the School of Mathematics of Yenching University, causing students to rub their hands and try their best to grab a spot.

Xu Yuan also serves as an editorial board member of the Journal of Mathematics, and is responsible for accepting excellent papers for the journal.

In addition to Ma Zhiming's connections, students from both schools can attend every lecture.

However, due to the limited number of places, we can only limit the number of students who have made reservations.

Only students of the School of Mathematics are required to register.

It is recommended that the applicants be graduate students or doctoral students, or senior students in their third or fourth year of college.

Otherwise, if you sign up and find out that you have never learned and cannot understand what Xu Yuan is talking about, it would be a waste of your place.

But even in this situation, there are still many people who failed to grab a spot.

So in the end, someone left a message to Xu Yuan through his Weibo account, hoping to get a spot through the back door.

This shows how popular Xu Yuan’s lectures are.

The final result was that no one got the quota, but instead Xu Yuan became a hot topic again.

The comment section became a place for students who did not get a place to comfort each other.

"Professor Xu finally opened an open class, but I didn't get it."

“It’s too hard to grab.”

"I have been practicing for many years but I still can't succeed. What about the internet speed of those who got the quota?"

"I heard that Professor Xu will also provide guidance on papers this time. Seniors who are writing mathematics papers are in luck. You know, there are a lot of professors in the international mathematics community who want Professor Xu to provide guidance."

"Suddenly I feel like I missed out on 100 million!"

"Don't worry, everyone. I heard there will be an open class next week."

"Professor Xu's classes should all be filmed, so we should be able to watch them online."

……

Xu Yuan didn't know that there were many people on the Internet who felt very regretful because they couldn't listen to his lectures and joined him for support.

At this moment, he was standing on the podium of the largest lecture hall in the School of Mathematics, and the audience below was filled with mathematics students from two universities.

Because there were so many students who registered, many of them were standing at the back and in the aisles.

Although I knew I might have to stand for several hours, I enjoyed it and had no intention of backing out.

They all looked at Xu Yuan with excitement.

Although most of the people present were the same age as Xu Yuan, they all regarded Xu Yuan as their life idol.

There is only worship for it.

Looking at the dense crowd below the stage, Xu Yuan noticed that the entire classroom remained quiet, which made him very satisfied and a smile appeared on his face.

"Thank you all for coming to my class. Today I will talk about the advanced extension of topology."

"Afterwards, I will leave time for everyone to ask questions, and you can also speak up if you have any questions about the paper."

"But the papers supervised by me can only be published in our own Acta Mathematica Sinica."

Xu Yuan wrote the content of the course on the blackboard and skillfully opened the presentation to communicate with everyone, and finally he did not forget to make a humorous joke.

This made everyone laugh out loud and successfully livened up the atmosphere.

Today, the impact factor of the Chinese Journal of Mathematics is not low. Even if it is not as good as the four top mathematics journals, it is not much worse than other international mathematics journals.

The key is that it has been recognized by many famous universities.

Even overseas mathematicians are now actively submitting their papers to the Journal of Mathematics.

Even the threshold for passing the manuscript is not low.

Therefore, domestic mathematics students will take the initiative to submit papers to the Journal of Mathematics.

And having my paper published in the Chinese Journal of Mathematics makes me even more proud than having my paper published in the four top mathematics journals.

Because it is very likely that my manuscript was reviewed by Xu Yuan.

In the following time, Xu Yuan no longer wasted everyone's time and started explaining at his own pace.

Topology is the study of geometric figures, or properties of space that remain unchanged after continuous changes in shape.

It was developed from geometry and set theory.

Mainly studies concepts such as space, dimension and transformation.

And it also involves the Millennium Prize.

In domestic universities, not many courses are set as topology compulsory, and what is studied are only introductory knowledge.

The reason why he chose topology as the topic for today's talk is that in addition to the fact that topology has a wide range of applications and can cultivate good spatial thinking and mathematical thinking, the more important point is that he has also been studying topology knowledge during this period.

The Hodge conjecture, one of the Millennium Prize problems, involves topology and algebraic geometry.

If the Hodge conjecture can be proved, it would be equivalent to finding a way to combine algebraic geometry and topology.

It plays a very important role in the research and development of mathematics.

Because apart from number theory, the branch of mathematics he studied most was geometry.

In addition, during the previous discussions with Deligne in Princeton, we also exchanged a lot of knowledge about algebraic geometry.

After this period of research, he finally decided to focus his subsequent mathematical research on algebraic geometry.

To study algebraic geometry, one cannot avoid the important unresolved Hodge conjecture.

It is recognized as one of the seven most difficult mathematical problems in the world.

However, the Hodge conjecture is a very powerful method for studying the shape of complex objects. Topology is needed in many places, so he shifted his focus and energy to this area.

But it was only after he really started to study the Hodge conjecture that he had a clearer understanding of the world's seven major mathematical problems, the complexity of which was indeed unimaginable.

It is very difficult to prove.

This can be seen from the progress bar on the panel in front of him which does not change at all.

One has to admire Perelman for proving the Poincare conjecture.

If I have the chance to meet each other, I really want to have a good discussion.

Of course, since he decided to challenge the seven most difficult mathematical problems in the world, he also anticipated the problems he would face.

I will definitely not give up just because of difficulties.

Otherwise, every time this happened, he would not have been able to solve the ultimate problem in the field of number theory.

Goldbach Conjecture.

Anyway, he didn't expect to complete the proof in a short time, so he would just deduce it slowly in the next period of time.

After all, he is still very young.

Today's class lasted more than three hours. Some students listened with great interest and gained a lot from the advanced and extended topology, while others were drowsy and didn't quite understand.

The bottom line is that there aren't many topology courses.

Fortunately, everyone was very enthusiastic in the question-and-answer session that followed, and many raised their hands to ask Xu Yuan about the problems they encountered.

Xu Yuan gave a detailed explanation of this and even came across two good mathematics papers.

In the following month, Xu Yuan held open classes in this auditorium every week.

In addition to number theory, which he was best at, the content also included algebraic geometry, partial differential equations, etc., and there were even teachers from the college who came to audit the class.

It is worth mentioning that although he was the youngest person in history to become a second-level senior professor, the students did not react much to this, mainly because they thought it was completely natural.

……

In the blink of an eye it is December.

If anyone entered Xu Yuan's office at this time, they would definitely be attracted by the thick pile of drafts.

Because it is filled with complicated mathematical formulas and symbols.

Even if you call a math professor over, I'm afraid he wouldn't be able to understand what's in the draft.

After all, not everyone has the confidence to study the world's seven most difficult mathematical problems.

For mathematicians, they must have a clearer understanding of their own mathematical level.

It would be a waste of time to rashly study difficult problems that are beyond your level.

It's a thankless task.

People like Zhang Yitang who persisted in research for so many years and finally achieved results are among the minority.

"As expected, it is a very slim hope to prove a conjecture that is considered one of the world's seven greatest mathematical problems."

In the afternoon, Xu Yuan sat in his office. He stopped what he was doing and looked at the progress bar on the panel which was still at zero. He shook his head and couldn't help but sigh.

As the saying goes, all things are difficult at the beginning. If you can't find the correct proof idea, the progress bar will not grow.

But there is nothing that can be done about it.

Although he used several different approaches to try to prove it based on the mathematical branches he had mastered, in the end the progress bar did not change at all.

This shows that all his ideas are wrong.

Naturally, there is no need to continue the deduction.

New methods must be adopted again to prove it until the correct direction is determined.

The key is that this kind of thing cannot be rushed. Mathematical research requires the most inspiration and can only be done slowly.

Xu Yuan did not continue to calculate the following time. When he saw that he had received a new message on his mobile phone, he simply tidied up his desk, picked up his mobile phone, stood up and walked outside.

"boarding."

Soon Xu Yuan arrived at the driveway downstairs and soon saw a black car parked in front of him.

When the car window was rolled down, Chen Yuran's figure appeared in the driver's seat.

Seeing this, a doting smile appeared on his face, then he reached out to open the car door and got in.

Today, Chen Jianfang invited the young couple to have dinner over, and it was naturally difficult to refuse such an invitation.

Chen Yuran drove very steadily on the road, because she had had her driver's license for a long time and she liked driving very much, and she was basically the one driving the car at home.

Soon when the two of them arrived at the place, they immediately saw that Su Meihong and Chen Jianfang had already prepared the food.

Since they were already a family, there was no need to be polite. After washing his hands, Chen Yuran pulled him to sit down.

At the dinner table, Su Meihong could be seen wanting to speak several times, but after moving her lips slightly, she still didn't say anything.

This made Xu Yuan and Chen Yuran breathe a sigh of relief, knowing that if these words were really spoken, it would definitely induce labor. The key point was that they had no plans in this regard at the moment.

Fortunately, Chen Jianfang seemed to sense that the atmosphere was a bit strange and suddenly turned around to talk to Xu Yuan.

"The group's annual meeting will be held next month, and you, as a researcher at our institute, will also have to attend."

Hearing this, Xu Yuan knew that Chen Jianfang was talking about the Aerospace Science and Technology Group Conference, which is essentially the same as an ordinary company's annual meeting. In addition to summarizing the work content of the year, it also commends people who have made outstanding contributions. In this regard, it is much more powerful than the aviation industry.

As a researcher at the Institute of Space Technology, he really had to attend.

(End of this chapter)