Chapter 79 Two-hour academic report [Subscribe for monthly tickets]

"I suggest you change into this suit of mine. If you stand on the stage wearing it, you will surely scare away those foreign professors."

Early in the morning in the dormitory of Zijing Apartment, Li Zhenya enthusiastically suggested clothes for Xu Yuan to attend the academic conference on number theory, and took the initiative to contribute his secret battle suit that he would use for a date with a senior.

Even though it hasn't been used yet.

"Brother Yuan is so confident that he can just stand on the stage." Wang Haitao responded from the side.

Liu Yang: "Come on, Brother Yuan!"

They all knew that today was the day of the number theory academic conference, and they were all very excited that Xu Yuan would be giving a report on stage.

In particular, I learned that there were many professors from overseas universities participating.

I was even happier for Xu Yuan.

After all, it is so impressive to be able to perform on stage at such an occasion.

Originally, they wanted to shamelessly sneak in and watch Xu Yuan speak on the stage.

But when I thought about the fact that I couldn't understand the content of the report at all, I promptly gave up this unfeasible idea.

Otherwise, if I fell asleep at the conference, it would be an international embarrassment.

"It's not time for you to wear this battle suit yet. It's just that a two-hour academic report is not as complicated as you think." Xu Yuan put on a smile and raised his hand to reject Li Zhenya's suggestion.

First of all, he himself doesn't like wearing suits, and secondly, he doesn't think this academic conference is that grand.

In essence, it is a gathering of mathematics scholars to discuss new discoveries in number theory.

In his opinion, it was no different from attending the opening ceremony as a representative of the freshmen.

Just attend as normal.

He only changed into a set of clean and comfortable clothes today. After asking Li Zhenya to put the suit away, he reached out and picked up the emblem of Qinghua University on the table next to him and carefully pinned it on his chest.

"Then I'll go. You don't have to wait for me for lunch."

After giving instructions to his roommate again, he went out to the academic lecture hall of the School of Mathematical Sciences.

"come on!"

Li Zhenya, Wang Haitao and Liu Yang stood at the door of the dormitory and shouted in unison.

……

When Xu Yuan arrived at the lecture hall, he immediately saw various welcome banners hung outside.

There are also many seniors from the Student Union who are busy here, waiting to receive professors from home and abroad who will come from the hotel to attend the meeting.

As soon as he walked into the academic lecture hall, he noticed several familiar figures.

In addition to Tang Shih-hong, Professor Hu Zhi-wei, leader of the International Mathematical Olympiad team, and Professor Qi Tong-xiang of HKUST were also present.

Originally, a few people were standing there talking, and when they saw Xu Yuan, they immediately waved their hands and called out.

"Xu Yuan."

"Hello, Professor Tang and Professor Hu." Xu Yuan approached and greeted Tang Shihong and Hu Zhiwei first, then stopped his gaze on Qi Tongxiang: "Professor Qi, I finally have the opportunity to see you again."

Actually, he and Qi Tongxiang didn't have much contact. He only attended classes for about two weeks during the provincial team training.

But he was still grateful to Qi Tongxiang, after all, he was the first mathematics professor he met.

Qi Tongxiang looked at Xu Yuan carefully at this moment. Although his appearance was no different from the image in his memory, he was filled with emotion.

When I first met Xu Yuan, I just thought that he was very talented in mathematics and had a high chance of joining the national team.

I even thought about recruiting him into the Department of Mathematics at USTC.

But just over half a year later, the whole situation has changed dramatically.

Xu Yuan's growth rate far exceeded his imagination.

Not only did he win the gold medal with full marks in the International Mathematical Olympiad, he also took the college entrance examination and got the top score with extra points.

Perhaps these are still in the realm of genius, but the most unexpected thing is that Xu Yuan actually solved the problem of infinite Carmichael number intervals and even successfully published a paper in the Annals of Mathematics.

Even a mathematics professor like him would envy such achievements.

"Xu Yuan."

"You gave me a fright."

"I couldn't believe it when I first got the news that we had solved the problem of infinite Carmichael number intervals."

"It seems that I underestimated your talent in mathematics."

Qi Tongxiang reached out and patted Xu Yuan on the shoulder, speaking these words from the bottom of his heart with deep emotion.

Hu Zhiwei next to him was also not in a good mood about this, especially after he learned from Tang Shihong what happened at the Olympics.

"You are so brave that you actually proved the Carmichael number spacing problem in the Olympiad exam. No wonder you were still writing when the papers were collected."

"Looking at so many international mathematics olympiads, there is absolutely no other person who can do this."

Xu Yuan felt a little embarrassed after hearing what Hu Zhiwei said: "I went to prove it after I finished the test paper."

"Don't you know Xu Yuan yet? He won't do anything without confidence."

At this time Tang Shihong interrupted and said something to help Xu Yuan out, and then showed extra concern.

"How's the report going?"

"No problem, the content is all in my mind." Xu Yuan nodded and answered with confidence.

Having said that, Tang Shihong did not delay Xu Yuan any longer and asked him to go and prepare first.

"Then you should go backstage and get ready. People will probably be here soon." "Okay, Professor Tang."

Xu Yuan responded obediently, greeted Hu Zhiwei and Qi Tongxiang, and then walked straight to the backstage of the lecture hall.

Not long after.

As several school buses stopped on the road outside the lecture hall, participants of the number theory academic conference got off one after another.

Liao Fangyi, director of the Department of Mathematics at Qinghua University, and Ma Zhiming, chairman of the Mathematics Council and academician of the Chinese Academy of Sciences, came out to greet them.

As the participants entered the lecture hall and took their seats one after another, Xu Yuan also saw familiar faces backstage.

"I didn't expect to meet Professor Feng again."

He glanced at Feng Zuming who was sitting in the first row, feeling somewhat surprised.

It was normal for him to attend this mathematics academic conference and sit in the front row as a representative of Princeton University, but he was surprised that he would be willing to come.

After all, the conversation between the two at the Olympic Games dinner is still vivid in my mind.

However, Xu Yuan had no intention of bringing up this matter in person.

He solved the Carmichael number interval problem not to prove anything to the other party.

Besides, since he is attending the event on behalf of Princeton University, he will certainly observe all the necessary etiquette as the host.

The relevant thought flashed through his mind for a moment, and then he stopped thinking about it.

However, the female professor sitting next to Liao Fangyi made him quite curious about her identity.

nine in the morning.

The host first stood on the stage and introduced the identity of the speakers to the participants in both Chinese and English.

……

“I am pleased to introduce our plenary speaker today, Xu Yuan from the School of Mathematical Sciences of Qinghua University.”

Then Xu Yuan walked up to the podium amid warm applause.

Facing the mathematics professors and scholars from universities at home and abroad in the audience, he was not at all nervous.

First, I introduced myself and thanked the conference organizers, and then formally began my report today.

At the same time, the title of the report appeared on the screen next to it.

"On the application of a new sieve method to the problem of solving the interval between infinitely many Carmichael numbers."

It is worth mentioning that Xu Yuan completed the entire report in English.

From the optimization innovation of the sieve method to the final thorough proof of the Carmichael number interval problem.

There was no pause for two hours.

During the report, the audience didn't even dare to applaud, for fear that it would affect the rhythm of Xu Yuan's report.

The report was not completed until almost eleven o'clock in the afternoon.

“n+n/（ln n）/2+δ，ln n/……”

"From the above, we can see that when n>3300, there is always a Carmichael number between n and 2n."

As Xu Yuan finished writing the last mathematical symbol on the blackboard and threw away the chalk to draw the final conclusion, the audience was stunned for half a second and then burst into long and enthusiastic applause.

Xu Yuan waited until the one-minute-long applause stopped before proceeding to the question-and-answer session.

According to the process of academic conference reports, after the speaker completes the report, questions will be asked based on the content of the report.

It is a bit similar to the thesis defense when graduating from university.

Of course, Xu Yuan was confident about this and waited patiently after inviting questions.

After waiting for about half a minute, a middle-aged man in the back row stood up.

Take the microphone from the host and ask your own questions.

"Student Xu Yuan, I would like to ask whether this new sieve method can be used to prove the prime number interval problem?"

Xu Yuan focused his gaze on the person who asked the question. When he found that he looked very familiar, he was stunned. He really didn't expect that Zhang Yitang also participated in this number theory academic conference.

Xu Yuan was naturally familiar with Zhang Yitang. The two had even had a few simple exchanges in their previous life.

The result was that we met again in this way.

Zhang Yitang took a leave of absence from the University of New Hampshire to attend the meeting in order to apply this sieve method to solving the prime number problem. When he saw that Xu Yuan was slow to respond, he thought that his judgment was wrong and that this sieve method could not prove the twin prime problem.

I couldn't help feeling a little disappointed.

But then he asked again.

"Can this new sieve method only be used to prove problems related to Carmichael numbers?"

Xu Yuan finally reacted after hearing Zhang Yitang's words, so he quickly shook his head and responded with a smile.

"I think this sieve method can be used in many more scenarios, such as the study and solution of twin prime pairs."

As he spoke, he picked up the chalk again and turned to calculate on the blackboard, giving a brief explanation of the study of the sieve method on twin prime pairs.

He didn't know what impact the sieve method he created would have on Zhang Yitang's solution to the twin prime problem, but if it could really promote the solution of this difficult mathematical problem ahead of time, it would be something worthy of praise.

Later, Professor Pomerance, who had proved the problem of infinite Carmichael numbers, asked a question, which gave Xu Yuan a big surprise. He did not expect that the other party would come here from afar.

It can be said that without Pomerance's proof of the problem of infinite Carmichael numbers, he would not have been able to prove the associated interval problem.

Therefore, after the morning lecture, he took the initiative to meet the old professor Pomerance.

(End of this chapter)