"This afternoon there was a seminar on geometry and topology in Hall 5 on the 3rd floor of the Great Hall. Did you go to listen? Some of their views and ideas are quite interesting."

Academician Wu asked Zhao Xiancai.

Regarding the arrangement of this symposium at the annual academic conference of the Chinese Mathematical Society, it is mainly divided into four major directions, which are algebra and number theory, geometry and topology, ordinary microdynamic systems, and partial differential equations.

Among them, algebra and number theory are available from 10:20 to 11:50 in the morning of the 22nd, from 2:00 to 5:50 in the afternoon of the same day, and from 2:00 to 5:50 in the afternoon of the 23rd.

There are three seminars on Algebra and Number Theory, all located in Hall 3 on the 3rd floor of the General Assembly Hall.

The seminar on geometry and topology is scheduled from 2:00 to 5:50 in the afternoon on the 21st, and from 8:30 to 11:50 in the morning of the 22nd, and at 2:00 in the afternoon of the same day.

to three fifty.

There are also three seminars on geometry and topology, all located in Hall 5 on the 3rd floor of the General Assembly Hall.

In addition, the time of Ordinary Microdynamic Systems and Partial Differential Equations also coincides with the first two. There are also three seminars, and the seminar locations are all different.

Therefore, no matter how powerful Zhao Xiancai is, he still has too many skills to cover all the seminars.

When Zhao Xiancai talked with Wu Fuquan about differential geometry and differential topology, he did not say what seminar he was attending this afternoon. Academician Wu naturally wanted to ask.

"In the first half of this afternoon, I attended a seminar on ordinary microdynamic systems, and in the second half, I attended a seminar on geometry and topology." Zhao Xiancai said.

"Ordinary microdynamic system?

I remember that Professor Zheng Xiaowei from Shuangdan University has quite high achievements in dynamical systems. He is also here this time. In the afternoon seminar on ordinary and microdynamical systems, he should have also spoken, right?

What do you think of him?"

Academician Wu asked Zhao Xiancai with great interest.

"Professor Zheng's achievements in dynamic systems are indeed very outstanding. However, although I have some understanding of dynamic systems, I have not studied them in depth.

Moreover, after the one-and-a-half-hour seminar in the afternoon, the 20-minute tea break was simply not enough, and I couldn’t abandon the seminar on geometry and topology in the second half.

So I didn’t talk to Professor Zheng today. I just talked about some of my ideas at the seminar in the morning. If there is opportunity and time later, I will talk to Professor Zheng about the power system."

Zhao Xiancai said.

What they call ordinary microdynamic systems is actually the dynamic system of ordinary differential equations.

The reason why I say this is because basically speaking, dynamical systems are a subject developed from the qualitative theory of ordinary differential equations.

However, dynamical systems are now more than just a qualitative theory of ordinary differential equations.

What the dynamic system focuses on is how the trajectory of the system goes after the time or the number of iterations approaches infinity, which is the so-called asymptotic behavior, and it also involves giving it a perturbation to see if there will be any changes.

"Do you really want to talk to Professor Zheng about power systems?

Dynamic systems can be in a wide range of directions, including hyperbolic dynamic systems, elliptical dynamic systems, dynamic systems on Lie groups and homogeneous spaces, and even algebraic or arithmetic dynamic systems.

However, some methods of dynamical systems also play an important role in number theory and combinatorial mathematics. The last time I participated in a foreign scholar’s ​​analysis of your article proving Goldbach’s conjecture, I learned that one of your evolutionary methods

Some methods of dynamical systems are also mentioned.

I originally thought that your research on power systems was not in-depth, but now it seems that your research on power traditions should be relatively in-depth.

It seems that what Yang Gang told me last time was really right."

Academician Wu said.

"Yang Gang? What did Teacher Yang say again?"

After hearing what Academician Wu said, Zhao Xiancai was confused. Why did he feel that Yang Gang seemed to be mentioning his name everywhere.

"The last time he and I met at a conference, we talked about you. He said at that time that your research on mathematics covers almost all fields of mathematics.

And tell me that if I have the chance to meet you in the future, I can chat with you about differential geometry and differential topology. You will not let me down, and there will probably be surprises.

Although you were indeed well-known at that time, I had never met you, let alone had any contact with you, so I naturally did not believe what Yang Gang said.

I thought at the time that he exaggerated you just because Peking University produced such a mathematical genius.

But judging from what I just talked about with you about differential geometry and differential topology, at least as far as differential geometry and differential topology are concerned, you did give me some surprises."

Academician Wu said.

After hearing what Academician Wu said, Zhao Xiancai didn't know what to say. Vice President Yang had really become his propaganda machine, and he would talk about him wherever he went.

"Okay, let's bring the topic back to what we just talked about.

Ordinary differential equations is a subject with a very long history, so I won’t say more about it.

Let’s talk about the infinite-dimensional dynamic system created by Professor Zheng. In fact, the so-called infinite-dimensional dynamic system is to move the tools in the dynamic system into partial differential equations, including pde..."

Professor Wu is obviously mainly engaged in the research of differential geometry and differential topology, and Zhao Xiancai came to him to talk about this aspect.

But somehow, they didn't talk about differential geometry and differential topology for long before they started talking about ordinary microdynamic systems.

Fortunately, Academician Wu doesn't have to attend tonight's meeting, so they have plenty of time.

After talking about ordinary microdynamic systems and preparing to turn the topic back to differential geometry and differential topology, Academician Wu said to Zhao Xiancai with emotion: "No wonder you can achieve such achievements at this age. Your knowledge of mathematics

Your understanding and knowledge reserve cannot be matched by me, who is more than thirty years older than you.

I really don’t know how you usually study and still have time to do research.”

What Academician Wu is most impressed by is Zhao Xiancai's knowledge reserve in mathematics. He believes that he has never fallen behind in the study of mathematics.

In his usual time, apart from eating, drinking, sleeping, and taking appropriate rest, Wu Fuquan spent almost all of his time doing research and reading literature.

But even so, he also felt that Zhao Xiancai, a young man who was 33 years younger than him, had a much deeper reserve of mathematics-related knowledge than he did.

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