Chapter 319: I have a student, not bad

Ding~ Ding~ There were a few more photos in the group. The protagonist of the photos had the same posture, hands together, expression solemn, as if performing some mysterious ritual.

Xu Zhengyang: "Old Xu, your seat has become a check-in holy land."

Xu Qingzhou: "???"

Zhai Ziqiang: "Final exams, everyone is coming to get some of your divine energy."

Looking at the boy sitting in his seat "paying homage" that Xu Zhengyang posted in the group, Xu Qingzhou was silent for a long time and replied: "Awesome."

Thinking carefully, I can actually understand it a little.

Jingda's math exams are notoriously terrifying, otherwise there wouldn't be so many people entering the school with the ambition to conquer the world, only to be hit hard in the first semester and start doubting life.

"Here, we already know that z(s) has a meromorphic continuation to re(s)=0, and s=1 is its only pole. Therefore, there exists an analytic function g(s) on re(s)>0, g(1)≠0..."

Read! {

"Next, you must want to extend z(s) to a meromorphic function on the right half-plane."

Meng Bin smiled lightly and got up to walk out of the classroom. A few minutes later, everyone saw two figures walk in, one was Meng Bin, and the other looked familiar.

The two began to chat about the situation over the years.

A girl handed up a question.

He and Chen Lixin could be considered rivals, competing from Jingda to Princeton, but they could also be considered friends who cherished each other.

Chen Lixin stopped drinking tea and said with a smile: "Let's go together, just in time to see the demeanor of your students."

Gu Zhizhong continued to compliment.

The girl who asked about prime numbers first had a flushed face and handed up the draft paper just now. Xu Qingzhou looked at it twice; it wasn't difficult, and he said directly: "In this part, since the series converges, the partial sum is bounded. You can try to apply the estimation formula in Lemma 3.3 above, and use the Cauchy convergence principle to prove it..."

At this time, Meng Bin's phone received a message.

The boy nodded, said thank you, and went down to calculate.

"Hmm hmm hmm! Yes! Xu Shen, you are so amazing!"

"Very amazing."

Ever since Xu Xu Shidi solved the three prime number conjectures, a prime number research craze had broken out in the School of Mathematics.

Chen Lixin's face was filled with self-satisfaction: "It's okay, this kid won the gold medal in MCM (two consecutive American Mathematical Contest in Modeling), much stronger than we were back then."

"Xu Shen!"

Seeing that the time was almost up, Gu Zhizhong said: "You drink some tea first, or walk around the school. I'm on duty today and need to go to the Q&A room for a few minutes."

This is the norm. Parents start comparing children when they reach a certain age, and old professors start comparing students when they reach a certain stage.

Meng Bin took a look. It was a question about extending multivariable calculus to multidimensional space. It wasn't difficult for him, so he picked up the draft paper and calculated a few times.

Chen Lixin really didn't know that Xu Qingzhou was considered Gu Zhizhong's student. The few papers he saw were all signed by Xu Qingzhou himself, without even any corresponding authors.

If it were before, Gu Zhizhong would probably have cursed a few times, but now—hehe, he doesn't know I have a student named "Xu Qingzhou," right?

Chen Lixin began to talk about his students.

20 minutes later.

Gu Zhizhong is stubborn and recognizes dead logic, which is very disadvantageous in a place where human relationships are mixed in the country. Moreover, the assessment system of domestic universities overemphasizes short-term results, and everyone is busy completing those scientific research indicators.

This is the norm. Professor Gu didn't come, so he and Wang Wang Shixiong Su Kewei helped answer questions.

"Just want to go back to my hometown to see. People are old and start missing home. Old Gu, in fact, with your personality, you are more suitable for teaching abroad."

Chen Lixin followed along for a while and asked suspiciously: "Is this person talking about the remedy for the proposition and proof of estimating the upper bound of stein on z(s)?"

Gu Zhizhong had to receive a friend and would be late.

"Xu Xu Shidi, then I'll leave it to you."

"Then you are lucky." Gu Zhizhong said lightly.

!.

The girl said: "I tried to use complex analysis to prove the prime number theorem. In order to connect the prime number theorem with complex analysis, I have already extended the Riemann zeta function from the real domain to the complex domain, but here in the Dirichlet series, there is no way to let s∈c satisfy o>o0, f(s) all absolutely converge..."

"Logic is clear, the process is simple. It seems he has great insight in the field of prime numbers."

After Chen Lixin finished evaluating, he paused and asked suspiciously: "The voice is very young. Your student?"

Meng Bin said with a smile: "Everyone don't be excited, if you have any questions, come one by one."

"Okay." Xu Qingzhou nodded and sat at the desk in the front row. Professor Gu wanted to see an old friend, so it was only right for him to help out.

Exam week, the "roll kings" are even crazier than before. Everyone is holding their breath, making a final sprint.

【Riemann zeta function and prime number theorem】

Xu Qingzhou shook his head modestly and said: "There is no problem, but just pay attention, you need to use the open cover principle to establish a series of ordered division points on y for the finite open cover."

Gu Zhizhong narrowed his eyes, knowing that this old guy wouldn't be here specifically to see him. Looking at this posture, it was clearly to show off. Of course, although they were already graduate students, not all questions could be solved. Math is like this; it seems that all roads lead to the same destination, but the research directions are different, and the content is vastly different, not to mention that the "roll kings" of Jingda are not doing ordinary things.

"Wang Wang Shixiong."

A moment later, he said: "Here, since the integration region d is a unit circle, polar coordinate transformation can simplify the calculation. In polar coordinates, therefore, we can convert the original double integral into the form in polar coordinates for calculation."

The two walked out of the office, and Chen Lixin sighed: "Your School of Mathematics' Xu Qingzhou, hmm, this young man is very good, a rare mathematical genius."

"Xu Qingzhou? It's okay." Gu Zhizhong said calmly.

"It's okay? I'm praising Xu Qingzhou, what are you being modest for? You, you are still as modest as ever. Speaking of students, I just accepted a student this year, and his talent is also very good."

Looking at the question, Meng Bin already had a headache.

"Definitely a big shot in prime numbers."

Someone recognized Xu Qingzhou, and everyone looked up. For a moment, a small commotion came from the classroom.

Xu Qingzhou was a bit helpless. He was calculating well, but Meng Bin rushed into the classroom and said he needed his help.

Gu Zhizhong poured tea for Chen Lixin calmly. "You old guy hasn't been back for more than ten years, why did you suddenly think of returning to the country and coming to see me?"

Meng Bin had just put Gu Zhizhong's teacup down when a student already came up with a question. "Wang Wang Shixiong Meng, can you explain this question to me?"

Meng Bin had a big head. He wasn't a prime number researcher. It seemed he could only wait for Professor Gu to come.

The old man with gold-rimmed glasses looked at Gu Zhizhong's office and said with a smile: "Old Gu, the office is not bad."

However, Gu Zhizhong's health-preserving foundation had grown. He had said so much, yet Gu Zhizhong was actually smiling and agreeing, without even a frown.

"Okay."

For example, the homology group of topological space in algebraic topology to distinguish different topological structures, the modeling and analysis method of nonlinear dynamic systems... Look.

Gu Zhizhong waved his hand and said with a smile: "How have things been these years?"

Despair eventually turned into metaphysics.

Chen Lixin really came to show off. He couldn't compare to this old guy Gu Zhizhong before. Looking at it now, his career was smooth, his disciples were numerous, and Gu Zhizhong... was still a professor.

Professor's office.

Some undergraduate projects were more complex than the master's student projects he had at Sichuan University.

It was normal for these classmates to be excited. In their eyes, Xu Qingzhou was completely the kind of super big shot who had broken through the void and ascended to the upper realm long ago. Let alone undergraduates, if he hadn't known Xu Xu Shidi before, seeing him suddenly, he would probably also have an urge to worship the big shot.

At the same time, Meng Bin went to the office to get Gu Zhizhong's teacup first, wanting to fill the water in Gu Zhizhong's teacup first, so that Gu Zhizhong could drink it directly when he came. After getting the water, he went to the Q&A room.

Xu Qingzhou: "Remember to split the ticket money 50/50 with me."

"Hmm."

"Teacher?"

Wait... Meng Bin paused, suddenly thinking, why wait for Professor Gu? Isn't Xu Xu Shidi right here! He glanced at the boy beside the girl. "Are you both having prime number problems?"

Listening to the people inside talking, Gu Zhizhong was slightly startled, and then showed a meaningful smile.

"It's okay, I became a tenured professor at Princeton a few years ago, and I have time to put all my energy into scientific research." Chen Lixin took a sip of tea.

After chatting with a few people in the group for a few minutes, Xu Qingzhou also put down his phone. Seeing Song Yao send a message saying she was ready to read, he didn't waste time either, turned to the place he saw yesterday noon, and soon sank into the complex calculations.

He remembered that it seemed to be Professor Chen Lixin who returned from the United States, who was a fellow apprentice with his teacher Gu Zhizhong, and had studied at Princeton together. After graduation, Chen Lixin stayed there to teach.

Xu Zhengyang: "We are discussing collecting ticket money, or just starting a Xu Shen Sect, and you are the spiritual totem."

"It's okay."

"Each has their own way of living. Abroad, they are all foreigners, and I can't get used to it."

These undergraduate projects are one more fierce than the other.

"Cauchy convergence principle?"

Approaching the Q&A room, the sound of someone lecturing came faintly, and both stopped.

Meng Bin got up and said: "You guys wait a moment, I'll find a teacher for you."

There were quite a few people in the Q&A room.

Gu Zhizhong nodded slightly.

"Hmm, a student I taught before. I guess he saw I wasn't there and came to help."

"Your student is not bad." Chen Lixin nodded. Although they hadn't met, he could feel it from the words spoken by the other party. This person already had the level of his own students.

"Barely okay."

Saying that, the two walked into the Q&A room.

(End of chapter) ===== CHAPTER 320 =====