"Let me introduce you to Xu Yun, this is Professor Tang's old friend Professor Zhang Yitang Zhang, he specially came back from overseas to see you." As soon as Qin Xiangxin's figure walked to the door, the cheerful voice had already reached his ears.

Xu Yun got up and looked in the direction of the door, his gaze swept over Qin Xiangxin and Tang Gu Cong and fell on Zhang Yitang.

Wait for the other person to take the initiative to greet each other before and after.

"Professor Zhang."

At the same time, a question mark slowly emerged in my heart?

What is the other party looking for himself.

Since he has studied number theory, it is impossible not to know about Zhang Yitang.

In particular, the label of a late bloomer on the other party is even more talked about in the academic community.

In the case of twin primes that have made no progress for many years, Zhang Yitang can make a major breakthrough in this number theory problem with a single paper, which is indeed worthy of the respect of the mathematical community.

He had also read this paper to help him understand it when he was studying number theory earlier.

But I never expected to meet in this way.

Just as he was secretly thinking about the other party's intentions and thinking of something, the other party's voice suddenly sounded in his ears.

"A genius boy in mathematics."

"Hello."

Seeing that the other party was so formal, Xu Yun didn't dare to hesitate, and hurriedly reached out and shook it with the other party.

"Let's sit down first, two professors."

Although he belonged to the junior in front of these people in front of him, as the host, it was not possible to let the guests take the initiative, so he immediately moved a chair and beckoned a few people to sit down.

Next to him, Qin Xiangxin took the opportunity to answer: "Don't be restrained, just be in your own office." ”

"Xu Yun is right, let's sit down and talk slowly." Satoshi Yutani agreed.

After all the people were seated, Xu Yun poured a few more glasses of water before sitting down next to him.

And then they talked to each other and said some polite words, which is simply the so-called business blowing to each other.

Xu Yun is happy to be idle in this regard, since the other party does not mention the business first to express his intentions, then he will definitely not take the initiative to lead the topic to this.

"The two of you are late bloomers and young geniuses, so you should really communicate more." At this time, Tang Gu Cong took advantage of the end of Zhang Yitang and Xu Yun's brief chat, and said this half-jokingly with a smile on his face.

Perhaps seeing that the topic was a little dry, Qin Xiangxin simply took the initiative to ask.

"I don't know what Professor Zhang came back for this time?" It's straight to the point.

Originally, Zhang Yitang was still a little embarrassed, so he didn't open his mouth to express his intentions, but now when he heard Qin Xiangxin's words, he responded to the situation.

"It's true."

"Actually, I'm mainly for the paper that proves that there are infinite primes in the Fibonacci sequence."

"There are some questions I want to discuss with Xu Yun."

When he expressed his intention, his eyes always fell on Xu Yun, obviously he actually said this to Xu Yun.

Xu Yun thought that the other party had always been engaged in the study of twin primes, so he basically guessed the purpose of the other party, but he really didn't expect that there were really people who came from overseas to urge the change offline.

Look what it's called.

Just when he was about to inform the other party that the paper had not yet been written, Zhang Yitang took the lead in making his request.

"Can I see the manuscript you left over from writing your paper?"

"Manuscript?"

Xu Yun was a little surprised.

He thought that the other party was urging a paper on topological group theory, but he didn't expect that he just wanted to see the content of his draft.

He did use a lot of scratch paper to demonstrate topological group theory before, and he put away these drafts after the paper was completed, and it was indeed easier to understand topological group theory when he studied the drafts than the paper.

Sure that the other party was not here to urge the change, Xu Yun breathed a sigh of relief and immediately got up and walked towards the desk.

"Professor Zhang, wait a minute."

"I'll get it."

In the middle, I didn't forget to respond generously.

When Zhang Yitang heard this, he spit out two words relatively calmly.

"There's no hurry."

But if you look closely, you will find that his eyes always fall on Xu Yun, which shows that he is still quite excited.

Soon Xu Yun took out all the drafts and looked a little embarrassed after walking back in front of Zhang Yitang.

"The order of that draft might be a bit messy, and it might look like it's going to be a struggle."

Compared with other people's intentions to sort out their drafts, Xu Yun seemed very casual in this area, plus the energy potion effect that day went into the school doctor's office, and it was something that his classmates helped collect, so many drafts would inevitably be messed up.

On the other hand, Zhang Yitang didn't care about this, and after reaching out to take it, he couldn't wait to check it out.

"It's okay."

It's no exaggeration to say that it takes almost a few breaths to immerse yourself in it, and it's almost comparable to the effect of concentration.

From this point, it can be seen that Zhang Yitang is indeed very fond of number theory.

Because there is a lot of content in the draft, it will take a lot of time to read it all, so Qin Xiangxin and Tang Gu Cong got up and walked aside, and Xu Yun was naturally by the side.

At this time, out of the corner of his eye, Tang Tani glanced at an all-English book on the table, and a little surprise appeared on his face.

"Huh~"

"You're still reading the book?"

The English translation on the book cover is pattern recognition and machine learning, and he also knows something about it, knowing that it is a relevant textbook for related majors in the Institute of Planning.

Because of this, I was puzzled by Xu Yun's reading of this book.

At present, the entire number theory community is waiting for Xu Yun to publish the paper on topological group theory, in his opinion, Xu Yun should devote himself to research, improve topological group theory as soon as possible and make a significant contribution to the development of number theory, but Xu Yun instead studied computer-related things.

Xu Yun didn't hide anything in the face of Tang Gucong's question, and answered directly and truthfully: "I have been researching artificial intelligence and machine learning recently. ”

Qin Xiangxin, who was next to him, also echoed: "Xu Yun is not only a member of our Institute for Advanced Study, but also a graduate student of the president. Tang Gu Cong introduced Xu Yun's two identities.

Tang Gu Cong naturally knows the field of Wu Zhongping's research, and also understands that learning computers with a mathematical foundation will get twice the result with half the effort.

But thinking of the topological group theory proposed by Xu Yun, I couldn't help but ask more.

"What about your topological group theory research, can the number theory community wait?"

Xu Yun really didn't expect to avoid Zhang Yitang, and Tang Gu Cong stared at him, saying that he would give him a face-to-face reminder.

Although I couldn't laugh or cry in my heart, I still responded: "There is still a lot of room for improvement in the research of topological group theory, which cannot be solved in a short time, and I also want to precipitate myself while studying other things." It was so hard that Tang Tani couldn't find a reason to refute.

After a while, it turned into a sigh of emotion.

"You have a point, it is true that the matter of mathematical research cannot be solved by time."

Oh, yes.

Math doesn't come naturally.

No matter how well you master the basics, without that inspiration, you still can't have a qualitative effect.

As an old friend of Zhang Yitang for many years, he feels this deeply.

Otherwise, the other party would not have been too middle-aged to write the paper that promoted the progress of twin primes.

It wasn't until it was almost noon that Zhang Yitang withdrew his gaze from the stack of scratch paper.

Regrouped it, stood up, moved his body, and then walked in front of Xu Yun without hiding the heat in his eyes.

"Your understanding of number theory is already higher than mine, and this topological group theory is really amazing."

"If the famous conjecture of number theory can be completely solved, I believe that this person must be you."

After Zhang Yitang roughly read the argumentation process on the scratch paper, the whole person was completely impressed by Xu Yun's genius-like thinking, so much so that at this moment, he put aside the age gap between the two people and expressed his expectations for Xu Yun in a friend-like tone.

Before returning to China, although he spoke highly of Xu Yun's paper, he did not think that topological group theory alone could solve the problem of number theory.

Even on the phone with Satoshi Yutani, he adheres to a conservative attitude.

After all, the problem of number theory, as a mathematical problem in the world, has plagued the mathematical community for many years since it was proposed.

It's not so easy to solve.

But today, through the argumentation process on scratch paper, he has a new understanding of the proof method proposed by Xu Yun, and perhaps with the improvement and optimization of this method, it is really possible to use it for the proof of number theory problems.

After all, the bridge to the highest temple of number theory has appeared, and sooner or later a mathematician will walk in.

Xu Yun didn't expect Zhang Yitang to suddenly give him such a high evaluation, which made Tang Gu Cong and Qin Xiangxin next to him fall into ecstasy, I am afraid that at this moment, the problem of brain complement theory has been solved by the Chinese people.

But Xu Yun knows very well that he still has a long way to go before this step.

Especially if you don't turn on brain overclocking.

After all, the proof process of Hodge's conjecture is the product of random rewards, unlike the topological group theory he created himself.

"Thank you, Professor Zhang, for giving me such a high evaluation, but topological group theory still needs to be improved."

"I don't dare to be too ambitious."

With a faint smile on his face, he responded in a more humble tone.

This sentence also made Zhang Yitang feel better, and he had a feeling of forgetting his friendship with Xu Yun.

The next step was to make another request.

"There are other things I need to ask you about, which may help me in my twin prime studies."

"Absolutely." Xu Yun generously agreed.

However, as soon as the two of them finished speaking, they were interrupted by Qin Xiangxin next to them.

"If there are any problems, let's discuss them in the afternoon, it's all busy and it's time to eat in the morning."

"Dean Qin is right, let's go eat first." Hearing this, Tang Gu Cong nodded in agreement.

Previously, Zhang Yitang had been immersed in the draft, temporarily forgetting about the problem of eating, and he didn't feel hungry at all, but now he was reminded by the two of them, and his stomach was not very angry.

You must know that using the brain is quite energy-intensive.

So a few people went to the restaurant first, and discussed the relevant knowledge of number theory in the afternoon after eating.

Xu Yun naturally has no opinion on this.

In this way, he was discussing and communicating with Zhang Yitang all afternoon, and it can be said that both sides benefited a lot.

And after Zhang Yitang left, Xu Yun's life was back on track.

In addition to staying in the high institute to study algorithms and sort out mathematics, he went to the old campus where Wu Zhongping asked about programming and architecture problems in artificial intelligence.

Just as Xu Yun was thinking about what the first project he would participate in when he became a graduate student, Zhou Zhi suddenly called him over.

(End of chapter)