"Professor Thurston? Indeed, when it comes to the study of three-dimensional manifolds, there is probably no one in the world who is more proficient than Professor Thurston! Jun Xin said in a trance.

"Professor Thurston is not here today, he was invited by Professor Yau Chengtong and Professor Hamilton of Harvard University to communicate with Professor Ry-Beckett that Professor Thurston will be coming by Wednesday next week in order to participate in the afternoon tea discussion between professors next week." Als explained.

"It's okay, there's no rush on this matter anyway. Changing the way you play chess is not something that can be done in a day or two. It would be nice to have time to ask Professor Thurston about it. Junxin said indifferently.

"By the way, how is your presentation prepared?" Als asked. Before that, he already knew that Junxin was the one who solved Modell's conjecture.

"You know, the problem is solved, it's not a thing to do a presentation, and I'm ready to start at any time. However, there seems to be a little bit of an idea on the part of the school. ”

"Oh? What is it? ”

"The school wants to invite a group of top mathematicians from the United States to come over and conduct a small-scale domestic academic exchange activity through this report on Model's conjecture." Junxin did not hold back, and told Als the reason.

"Oh, is it true?" After Ars listened to Junxin's words, his eyes lit up a little.

"Well, that's what Principal William's assistant, Miss Tees, told me, and I don't think it's wrong. With the depth of our background at Princeton University, I think those mathematicians who have received invitations from our school will not let go of this opportunity, and I am afraid that it will be another grand event in the mathematics world, and I can't wait for it. Jun Xin said, showing a longing expression on his face.

"I don't know if I can meet Professor Margulis, his research on Li Qun is very enlightening for my research, and I want to ask him some questions in person." Als said expectantly.

"Stop dreaming!" Junxin unceremoniously struck, "Professor Margulis is a mathematician from the Soviet Union, not the United States. Given the relationship between the Soviet Union and the United States, it is unlikely that you will meet him. ”

"It's a pity!" Ars said regretfully.

"I've also done some research on Lie Qun and Lie algebra, if you don't mind, we can discuss it together, how about it?" Junxin said with a smile.

"What do you think about the xx nature of the expression of Weyl's and Gaddam's findings in the complex domain in Lie algebra?" For this new roommate, after a few days of getting along, Als did not doubt his mathematical attainments, so after hearing Junxin say that he had studied Li Qun's problem, Als did not hesitate to open his mouth and ask.

Junxin replied, "Question about Lie algebra......"

To be honest, Junxin is not fortunate to open his mouth in this regard, but is very serious. Since the 80s, Li Qun and Li algebra have gradually played an important role in the field of quantum mechanics and physics, and as a researcher of mathematical physics, Li Qun and Li algebra have indeed been the key problems he has studied.

The two began to discuss the problem of Li Qun and Li algebra, which did not attract much attention, because after the game, the students of Princeton University gathered together in twos and threes and began to talk about the topics of their own interest, and even some topics, some professors also participated.

"Do you mean that Lie groups and Lie algebra are closely related to some of the conclusions of quantum mechanics?"

"You're right!" Junxin nodded and said, "In fact, there are already signs of research in this area, such as the research problem of Li Qun's E8." At present, it seems that the research on Li Qun's E8 problem has gradually attracted a large number of mathematicians to calculate, but to be honest, as far as E8 is concerned, the data copy of the entire calculation is about 60 GB, and to complete the operation of such a large amount of data, it not only puts forward extremely high requirements for the electronic computer, but also needs to recode and modify the existing program operation, because E8 alone contains a 248-dimensional popular calculation. ”

"However, because it involves high-dimensional operations, some of the conclusions reached by physicists through dimension-reducing calculations and processing can be well consistent with some problems in quantum mechanics, which is a very interesting conclusion." Junxin concluded.

"I don't think it's our business to worry about what's the use, that's the physicists' business!" Als said unconcernedly.

Junxin smiled and said: "That's not necessarily, in fact, many mathematical problems are invented by physicists, such as the kink problem, not long ago I left Professor Faltings a derivation paper discussing the kink table of thirteen nodes, which was completed independently by a good friend of mine when I was in the Department of Mathematics of Mizuki University, and the kink problem is a typical mathematical problem invented by a physicist." In addition, there are equations completed by Yang Zhenning and Mr. Mills, which have also been a major problem in mathematics in the past 50 years. ”

"But, does it matter?"

"These problems come from physics, so if you want to solve these problems, you have to go back to physics in the end. In fact, before coming to Princeton, I began to systematically study physics, and now I have some ideas about mathematical physics. Junxin's eyes lit up a little at this time.

"I think Professor Dyson would be happy to see you say that!" Ars said with a smile.

"Haha, in fact, what I want to meet is Professor Witten, because my current research is a bit the same as his, so I think Professor Witten and I will have a lot of common language."

"Oh? Guys, are you two talking about us? While the two were talking, a gentle voice suddenly came, interrupting Jun Xin's eloquent conversation, but Jun Xin didn't care about the interrupted train of thought, on the contrary, Jun Xin was very familiar with this voice.

"Hello, Professor Witten!" Jun Xin, who had experienced the baptism of the soul, barely suppressed his excitement and said with respect.

"Oh? Do you know me? Witten said in surprise.

"How can you not know each other, even if you forget other people, you will not be forgotten!" Junxin shouted inwardly, but he still said calmly and indifferently on the surface, "I read one of your papers, and I went to check the information about you out of curiosity, so I recognize you." This is my roommate and good friend Mr. Als-Alfors, who is currently in his third year of college, but his research focuses on Li Qun and Li algebra problems, so he has approached Professor Feverman to become his graduate student. ”

"It's not easy to be a graduate student of Mr. Feverman." Witten rolled his eyes and said, "But if there is a high-level article, then it is not impossible to get his favor." ”

"So we're discussing it right now, and we want to discuss some of my current questions, maybe we can find ideas for research." Als explained.

"Oh? I also have some research on Li Qun's problem, can I join? Witten asked gently.

"Welcome!" Ars and Junxin said in unison.