After class, Lu Zhou spent about ten minutes answering the questions raised by the students, whether simple or complex, before putting away the textbook and leaving the classroom.

Standing up from the back seat, Perelman, who had been waiting for a long time, also walked out of the classroom and stepped forward to follow Lu Zhou.

Just walked all the way, with a contemplative expression on his face, he suddenly spoke.

"A very ordinary class."

Lu Zhou smiled and replied casually: "It's originally a course for undergraduates, but if it's too difficult, they may not be able to understand it." ”

Perelman: "Why do you lecture with undergraduates?" ”

Lu Zhou: "Occasionally reviewing why the obvious is obvious helps us to think about what is not so obvious, why it is not obvious...... In fact, this is also Fermi's point of view, and I agree with him. Maybe there will be a few Fields Medal winners among the students who have taken my classes in the future, which is much more accomplished than my own awards. ”

The expression on Perelman's face didn't change much.

For awards in the field of mathematics, he has always abandoned the attitude of pursuing purity, so it is impossible to have any resonance when Lu Zhou said this sentence.

However, the first half of the sentence made him fall into deep thought, and he couldn't help muttering in his mouth, chewing this sentence again.

“…… Something less obvious. ”

"Yes," Lu Zhou said in a casual tone, nodding his head, "For example, the Motive Theory and the Langlands Program, these seemingly simple things are actually not so obvious principles. What is the essence of numbers and shapes? Our civilization has been thinking about this since the existence of mathematics. Historically, great mathematicians have often been theologians or philosophers. ”

Perelman: "Are you a theologian?" ”

Lu Zhou: "It's a pity that I'm a materialist who admits death...... When I arrived, this was my office. ”

took out the key and opened the door, and Lu Zhou turned on the light.

Normally, someone was on duty here, but today was Saturday, and his three assistants were off at four o'clock. As for the students, since he never made a hard requirement to clock in in the office, he basically soaked in the library or did his own thing on weekends.

"Help me move the whiteboard out of the corner."

"Okay."

Walking forward, Perelman dragged the whiteboard out of the corner, and Lu Zhou pulled out a marker pen from the drawer of his desk.

Just as he walked over to the whiteboard and was about to start answering his friend's question from afar, footsteps were heard outside the office, and another acquaintance knocked on the door and walked in.

"Academician Lu, I'm here again—you, are you Professor Perelman?" When he saw Perelman, who was standing next to Lu Zhou with his arms crossed, contemplative, Dean Qin was suddenly shocked, and even his voice became incoherent.

Just after returning from the meeting, he was about to discuss with Lu Zhou how to deal with this matter, but he didn't expect to see this great god in Lu Zhou's office.

Seeing the strange old man, Perelman hesitated slightly, nodded, and replied in fairly standard English.

"Yes...... Any questions? ”

"No, there's no problem, it's just that we didn't expect you to visit suddenly," controlling the excitement in his heart, Dean Qin smiled and continued, "If only you had said hello to us in advance." ”

Perelman looked at him with a strange expression: "...... I'm just here to exchange some questions with Professor Lu, do I need to make a special application? ”

"No, no, no, I didn't mean that, there is still a little difference between saying hello and applying, but we need to prepare here. What do you say......"

Seeing Dean Qin's embarrassed look trying to explain, Lu Zhou thought for a while, and immediately understood his thoughts, couldn't help but shake his head with a smile, and spoke.

"Just leave it to me here."

Relieved, Dean Qin nodded with a smile and said, "Then please...... I'll talk to you later, you're busy. ”

After speaking, Dean Qin said goodbye, left the office, and closed the door with him.

Since Lu Zhou and the old man were communicating in Chinese in the second half, Perelman did not understand, so he looked at Lu Zhou in confusion and asked.

"What did you just say?"

"It's nothing, it's just a little thing about the inconsequential work," Lu Zhou smiled, his thumb on the cap of the pen, and his eyes turned to the whiteboard, "Let's go on." ”

……

This time in China, Perelman is obviously well prepared.

Judging from the small notebook he carried with him, it not only contained some commonly used Chinese texts marked with phonetic transcription and corresponding words, but also densely packed with a large number of notes he had made while researching that paper.

To be honest, answering Perelman's questions is not an easy task even for Lu Zhou, many things he himself is studying, and only six or seven percent can give a clear answer.

“…… Your question is very interesting, but unfortunately I can only answer that, and I may not be able to answer you until the whole research is completed. ”

"It's okay," Closing the notebook in his hand, Perelman shook his head, and a trace of admiration couldn't help but appear on his expressionless face, "Originally, I was going to discuss these things with you, but I didn't expect you to know so much ......"

Lu Zhou: "......"

I rub.

You said it earlier!

Originally, he thought that this guy was summarizing these questions when he was flipping through his paper, but he didn't expect that he only guessed half of them correctly. These questions are indeed summarized when reading your own papers, but they are not the problems that appear in your own papers at all.

The expression on his face didn't change much, Lu Zhou smiled and said modestly.

"Listening to these questions you asked, I think you have also studied the theory of great unification. It just so happens that my research group is still short of people...... I don't know if you're interested. ”

When he said this, Lu Zhou originally didn't have much hope, after all, this guy's temperament and temper can be said to be well-known in the mathematical world.

What I didn't expect was that Perelman's reaction once again surprised Lu Zhou, and he didn't even think about it for a moment, so he nodded straightforwardly and said.

"If my job is necessary, please let me be involved."

After saying this, Perelman couldn't help frowning when he saw that Lu Zhou hadn't spoken for a long time, and continued.

“…… Any questions? ”

“…… It's nothing, it's just a little unexpected, I didn't expect you to agree so readily. ”

Coming back to his senses from his surprise, Lu Zhou was happy in his heart, and said happily, "Everyone's work is indispensable, and with your help, I believe that this building under construction will be built even more perfectly...... In short, welcome, now we are comrades in the trenches. ”

With that, Lu Zhou turned around and returned to the side of his desk, and pulled out a document from the open drawer. After briefly checking the contents to make sure he had made a mistake, he handed the document to Perelman.

"Here is a document about the visit exchange, it has been stamped, you can sign it, with this you can get a new long-term visa at the immigration office."

"In addition, I guess you don't have a place to live, the newly built dormitory building of Jinling University happens to have a decent apartment, about 90 square meters, just in the campus, whether it is to the library or to the laboratory building of the mathematics academy. I can help you apply for visiting scholar status, again, just sign this document—"

Listening to the series of arrangements thrown by the landing boat, Perelman was stunned at first, and then quickly stopped his words, and said with a headache: "...... Wait, what does it mean to be a visiting scholar? ”

Lu Zhou: "Literally, in short, it is a temporary position at Jinling University in the form of a distinguished professor, after all, you live in their dormitory. ”

Perelman frowned: "I don't want to work, I don't have any interest in teaching, I'll leave here after I finish the grand unified theory of algebra and geometry." If you can, just give me a sofa to sleep in, there's no need to prepare an apartment for me. ”

Lu Zhou shook his head: "That's not good, not to mention that even if it's a sofa, you have to have a place to put the sofa." ”

Perelman shrugged his shoulders and said, "I heard Schultz say that your house is quite big. ”

Lu Zhou coughed lightly and said, "...... Don't even think about that. Except for my mom and dad and my sister, no one has ever been able to spend the night at my house. ”

Perelman: "......"

Seeing that Perelman didn't speak, as if he was hesitating about something, Lu Zhou continued: "You don't have to worry about classes, even if you are a distinguished professor, it doesn't mean that you have to take classes. Of course, if you want to teach, I think students who love math will be grateful for your generosity, and they will also have a good salary based on the number of hours of lessons. ”

Perelman muttered, explaining, "It's not that I don't like teaching, I just don't want to waste time on such inconsequential things." ”

Lu Zhou: "So I didn't force you. ”

"Thank you."

"You're welcome," Lu Zhou smiled and stretched out his right hand, "It's my honor to be able to accomplish this great cause with you." ”

Holding Lu Zhou's hand and shaking, Perelman had a rare smile on his face.

But soon, as if he had thought of something, his expression suddenly became a little embarrassed.

"I ...... There is another request, which may have to trouble you. ”

Letting go of his hand, Lu Zhou smiled and nodded.

"You name it, I can solve it for you."

Perelman said with a light cough.

"The apartment of 90 square meters is too big, can you change it to a smaller one for me, about 20 square meters...... Living in a house in the open space makes me feel uncomfortable. ”

After being stunned for two seconds, Lu Zhou looked at him with a strange expression and said speechlessly: "...... I always thought you chose to live in that place because you were poor. ”

Perelman stubbornly corrected.

"Poverty is only one of the reasons."