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1 Twenty Chapters Bourbaki Seminar
Some people say that college life is like a glass of plain water, bland and tasteless, but for Lin Xiao, he has realized that this glass of plain water can make him feel full.
Without being disturbed by others every day, Lin Xiao completely swims in the ocean of knowledge and feels the pleasure of constantly enriching his brain.
As for the group meeting, it was held as usual on the Friday of the second week, but in this week's group meeting, the exploration of the physical meaning has already been emphasized, that is to say, the establishment of an incompressible elastic dynamic system, The two professors clapped their hands, and finally decided something that Lin Xiao couldn't understand.
For example, incompressible isotropic Hookean elastodynamic system, Lin Xiao knows about Hookean, that is, Hookean type. As for Hookean, he is naturally the one who proposed Hooke’s law. He also knows other terms, what is incompressible, What is isotropy, etc., but when connected, he lacks relevant knowledge reserves.
Of course, Tang Qing didn't care about this. After all, he only needs Lin Xiao to be able to play a role in mathematics, and the subject time is still long. Their subject has only been in class for a few months. Of course, the research cycle of a subject is very long. Otherwise, where would they have so much time to spend money?
After the day's group meeting ended, Lin Xiao left the conference room and walked out of the research center. Just as he was about to go to the library, he suddenly received a call.
"Huh? Professor Xu Ji called?"
Professor Xu Ji himself is also a professor of mathematics at Beijing University. Speaking of which, Lin Xiao hasn't seen him for so long.
So he connected the phone and said with a smile, "Professor Xu."
"Little Lin, are you enrolled in school now?"
"Yes, speaking of it, I haven't seen you since I came to school for so long, aren't you at school these days?"
"Hehe, I went to a mathematics conference some time ago, and I just came back a few days ago. Where are you now?"
"I'm in the Mathematics Research Center now, and I just got out of it, and I'm about to go to the library."
"Is it the International Mathematical Research Center?"
"Yes."
After listening, Xu Ji was silent for a while, and then said in a serious tone: "Come to my office now, and I will say a few words to you."
Hearing Professor Xu Ji's tone, Lin Xiao couldn't help being taken aback, what's wrong?
But the phone was hung up, he had no choice but to go to Xu Ji's office.
Soon, when he came to the Science Building, he found Xu Ji's office. He had been here before, so naturally he did not forget it.
Knocking on the door, "Come in" came from inside.
Lin Xiao opened the door and entered, and saw Professor Xu Ji sitting inside, as well as several graduate students of Xu Ji.
"Professor Xu."
When Xu Ji saw him coming, he got up directly, beckoned Lin Xiao to sit on the sofa next to him.
"Do you have anything to do with me?"
Xu Ji looked serious and said, "Did you go to the research center to do some research?"
"You have to answer honestly. If someone asks you to be a free labor force, tell me who it is, and I will trouble him."
"Don't worry about the other party being Professor Lao Shizi. There are a lot of bullshit things about Beijing University. I usually don't bother to scold that kind of person. If someone really asks you to do that kind of thing, then I have to talk to him."
The reason why he asked Lin Xiao to come over so seriously just now was because he was worried that Lin Xiao would be recruited by other professors as free labor. Of course, this free labor should refer to "brain power". Great, maybe there is a professor whose level is not good enough for Lin Xiao to help with research?
Moreover, the International Research Center mainly conducts project research, so it is certain that they will not find an undergraduate for no reason, let alone Lin Xiao.
If there is a professor who asks Lin Xiao to help him research the subject by virtue of his status, then he will really point at that guy's nose and scold him, just squeeze those postdoctoral fellows, and squeeze Lin Xiao?
This is not only harmful to people, it is even more harmful to their school.
Hearing Xu Ji's words, Lin Xiao's heart warmed slightly, and at the same time he felt dumbfounded.
Hearing Xu Ji's tone just now, he thought there was something bad about it, but it turned out that he was worried about it.
So he said with a smile: "In fact, there is no such thing. It is the subject of Academician Tang Qing. I took the initiative to participate in it myself. I am a little interested in physics."
"Academician Tang? Oh, that's all right. I thought you were called over by those people who came in through connections."
Hearing that Academician Tang was looking for Lin Xiao, Professor Xu Ji felt relieved.
Even if Academician Tang Qing asks Lin Xiao for help with a project, he will definitely not say that he is squeezing free labor. After all, he is an academician and there is no shortage of labor. Moreover, Academician Tang Qing treats his people very well, so naturally there is no need to worry. that kind of problem.
As for Lin Xiao's study of mathematical physics, Xu Ji didn't think there was anything wrong with it. After all, he also studied this thing himself, so of course he would not have such subject prejudice.
Then he smiled and said, "Why are you interested in studying mathematical physics now? Could it be that mathematics can't help you?"
Hearing Professor Xu Ji's question, Lin Xiao couldn't help laughing: "How is that possible? I don't know many problems in mathematics, but I just have a little interest in physics."
"Hehe, I hope so. If mathematics is not too difficult, I would not go to study mathematical physics."
Xu Ji sighed, the more difficult the subject of mathematics is, the more difficult it is. When mathematicians find themselves bumping into the "inner world" of pure mathematics, they will always find that this "inner world" is so special It's not for people to stay, so they will choose to leave here, and then enter the physical world.
There are many such people, and there are also many who have made great achievements in physics.
"It's all academic research, there is no difference." Lin Xiao said with a smile.
"Hehe, look, you have answered two questions in the field of prime numbers, and now you are not considering further development in the field of prime numbers? Twin prime number conjecture, Goldbach's conjecture or something?"
Hearing Goldbach's conjecture, Lin Xiao couldn't help thinking of the problem he saw in math textbooks when he was a child.
At that time, he didn't even understand the question. He only knew it was a 1+1 problem, but he didn't know why it was a 1+1 problem. He just thought that 1+1 was equal to 2. This still needs to be proved?
But now, he has a deep understanding of this kind of problem.
"If I have a chance in the future, I will try."
He said.
Hearing what Lin Xiao said, Xu Ji couldn't help but raise his eyebrows.
He inexplicably felt that Lin Xiao might succeed?
No longer discussing this issue, Xu Ji seemed to inadvertently ask at this moment: "By the way, are you about to choose a mentor?"
Lin Xiao was taken aback for a moment, and suddenly remembered what was said in the class before, it seemed that he was indeed going to start choosing a tutor.
"Yes." He nodded.
Xu Ji said with a smile: "Which mentor are you going to choose? There are only a lot we can choose from."
Suddenly he remembered something, and said again: "By the way, did Academician Tang tell you about choosing a mentor?"
"That's not there."
"That's good." Xu Ji seemed to be relieved, and then he seemed to be afraid that Lin Xiao would misunderstand something, and explained to him: "Academician Tang is basically working hard on mathematics and physics now, although you are not interested in mathematics. I am a little interested in physics, and I support this, but you should continue to study mathematics more, your talent should not be wasted, so you should also choose some tutors whose main focus is on mathematics."
"For example, I plan to go to France in January next year to participate in the Bourbaki seminar. Do you know the Bourbaki seminar? If you are willing to go then, I can take you with me—of course, you Gotta learn French before then because they're all talking in French."
Hearing Xu Ji's words, Lin Xiao raised his eyebrows.
Why does Xu Ji's words sound like... recommending himself?
However, compared to other things Xu Ji said, Lin Xiao was more interested in the Bourbaki seminar.
He had already heard about this thing.
The Bourbaki seminar has a close relationship with the well-known Bourbaki School in mathematics, and the Bourbaki School has an extremely strong position in mathematics, and their contributions to the mathematics community are also considerable, bringing great impact to the development of mathematics. Great motivation.
At the same time, it is the rooting and development of the Bourbaki School in Paris, France, which has also provided considerable assistance for Paris to become one of the centers of mathematics in the world. Even now, the economic strength of the United States has attracted many mathematicians to take root there, especially It was Princeton University, but it still did not affect France's status as a holy land for mathematicians.
So far, Paris, France is still the place that gathers the most mathematicians in the world.
The Bourbaki seminar, also under the influence of the Bourbaki school, began in 1948 and has continued to this day as a form of lecture. It does not refer to a class with fixed members, but invites Those Bourbaki School and other famous mathematicians, plus some students, then went to Paris, France to discuss.
And this form of seminars has also influenced various seminars now. It can be said that the present seminars are all established under the influence of Bourbaki's seminars.
Lin Xiao asked curiously, "Will the Bourbaki seminar be held in January next year?"
Hearing that Lin Xiao was interested in this, Xu Ji said with a smile: "Yes, next January, but it usually holds four games every year, and there is already one next month, but I plan to participate in next January That field."
"If you want to participate, just apply there, and they will probably be willing to agree, but again, you need to learn French, otherwise, you may not be able to understand it after you pass."
Lin Xiao nodded. He was indeed interested in this seminar, but after all, he had to learn French first.
And because of France's status in the mathematics world, there are also many mathematicians who have mastered French and English.
"I'll think about it later."
"That's fine. Of course, it's better to decide early, so that you have time to learn French. It's still a little nervous to learn some daily language and mathematics in three months."
Xu Ji nodded with a smile, and asked again: "Then do you have any thoughts on choosing a mentor?"
Hearing Xu Ji bring up the matter of his tutor again, Lin Xiao couldn't help but feel amused, and at the same time, he was sure that the old professor wanted him to be his student.
He smiled and said: "If you don't mind, I also hope to study under your hands at that time."
Chapter 121 The Stray Cat Downstairs
Hearing Lin Xiao's words, Xu Ji laughed, "Then you said this, then I will definitely not refuse."
The other graduate students in the office looked at their tutors speechlessly.
Good guy, what you said inside and outside the words only reveals one meaning, that is 'choose me', 'choose me', and finally say 'this is what you said'.
As for?
Of course, Xu Ji didn't feel embarrassed at all. He patted Lin Xiao on the shoulder and said with a smile, "In this case, you are my student now. Of course, I won't arrange for you to do anything." , you can just study your own stuff, I won’t interfere, if there is a topic in the future, if you are interested, you can participate, if you are not interested, just give you a name.”
For Xu Ji, it is good to let Lin Xiao become his student, but there is no need for Lin Xiao's request. Of course, if Lin Xiao has questions to ask him, he will of course answer them, but the premise is that It must be that the question is not the kind of world-class problem. At that level, he can only give some suggestions.
Some students don't need the tutor to take care of them at all. Obviously, Lin Xiao is like this.
Lin Xiao nodded and said with a smile, "Thank you, mentor."
Hearing Lin Xiao's directly changed address, Xu Ji laughed and said, "It's also my luck to be your mentor."
Lin Xiao smiled. He actually didn't have any requirements for choosing a tutor. When he was enrolled, the school allowed him to choose three tutors, but now he feels that it is meaningless to choose too many tutors. Just pick a mentor.
Just do your own research.
"Then what are you going to study in the future?"
Xu Ji asked with interest at this time.
"For research..." Lin Xiao thought for a while, and said, "Let's finish the subject of Academician Tang first, and study Goldbach's conjecture in my spare time. If I want to participate in the one you mentioned in January next year In the case of seminars, you have to have some results of your own."
"Well, then it's all up to you."
Xu Ji nodded, although he was a little surprised that Lin Xiao directly chose the difficulty of Goldbach's conjecture, but it was Lin Xiao's own choice after all, and Lin Xiao also had the ability to choose.
Although this does not necessarily mean that Lin Xiao can solve this world-class problem, even if he fails, it will not have any impact. After all, Lin Xiao is still so young.
Afterwards, he chatted with Lin Xiao for a while, and Lin Xiao left.
He returned to Yanbei Garden, bought some snacks in the store outside, and prepared them to eat when he was hungry after studying.
Then he returned to Yanbei Garden and went downstairs to his house, but at this moment, he suddenly saw a white shadow flashing past the bushes in the green belt next to him.
"what is that?"
Lin Xiao couldn't help being taken aback.
Could it be a wild cat?
He stepped forward, pulled away the bushes, looked inside, and sure enough, he found a cat.
It was a long-haired cat with mainly white fur and a reddish-brown fur similar to chocolate. However, it looked a little dirty. Of course, considering that it was a stray cat, it was normal.
However, the main highlight is its face.
When seeing this face, Lin Xiao couldn't help being startled.
"Damn, this cat is a bit pretty, isn't it?"
He couldn't help but marvel.
It was a wedge-shaped face, with a pair of crystal blue pupils inlaid on it, and the pupils were also separated by a piece of 'herringbone'-shaped chocolate-colored fur, and white fur underneath.
This kind of appearance is definitely the cute one of all the cats Lin Xiao has seen.
However, the cat was hiding in the bushes, watching him warily, as if it might run away at any moment.
"Is such a beautiful cat going to stray these days? Does it have an owner?"
Lin Xiao couldn't help being puzzled, and then he thought about it, and it's okay anyway, it's better to tease the cat.
So he stretched out his hand and called out, "Mimi? Come Mimi!"
He didn't have any hope at first, but after he called a few times, the cat really let go of its guard, and then walked a few steps in his direction.
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