Ye Fei has moved to a bachelor apartment in the teacher's community next to the school.

After returning to the accommodation, I began to pack my luggage and fly home the same day.

Less than a week after returning home, Academician Liu contacted him again.

"Ye Fei, do you know the 608 Institute in Zhonghu Zhuzhou?"

"The same institute that studies aircraft engines?" Ye Fei asked.

608 Institute, the full name of Xia Guo Aviation Zhuzhou Power Machinery Research Institute.

His research focuses on aircraft engines and helicopter deceleration transmission systems.

Of course, many other things were studied, but mainly aircraft engines and helicopter deceleration drivetrains.

"Yes!" Academician Liu said: "I have already talked about letting you look at the literature on the continuum hypothesis. ”

"That person's surname is Sun, his name is Sun Haitian, you go directly to find him, call this number after you get to the gate of 608, I will send you the phone number immediately, and someone will take you to see Sun Haitian."

"At the same time, you happen to go to 608 to study, which is one of the postdoctoral mobile stations, gathering a large number of domestic talents."

"Good!" Ye Fei smiled: "Thank you, Academician Liu." ”

There are only 3,361 postdoctoral mobile stations in the country.

It may seem like a lot, but it covers all disciplines of the natural sciences.

Divide it evenly, but there are not many of them.

The requirements for entering the postdoctoral mobile station are not very high, but it also depends on what the postdoctoral mobile station is.

The 608 Institute is a national scientific research institution and one of the five major aircraft engine research institutes in Xia.

Don't want to graduate with a doctorate from a non-prestigious university, at least Xia Guo 985 University, and foreign universities should benchmark domestic 985 universities.

It is not easy to enter the 608 Institute, let alone stuff people into it, which is even more difficult.

"It's fine!" Academician Liu said with a smile.

Soon after hanging up the phone, Ye Fei received a call from Academician Liu.

Ye Fei turned on the computer and inquired about the information of Sun Haitian in 608.

After Ye Fei finished reading it, he sighed: "It's another big bull." ”

Sun Haitian, 62 years old, is a well-known expert in aircraft aerodynamics and experimental fluid mechanics in China.

He has long been engaged in the research of complex flow mechanism and control of aircraft and the study of topological space theory.

He is the winner of the Outstanding Young Scholars Fund, the Changjiang Scholar Distinguished Professor, and the academic leader of the innovative research group of the National Natural Science Foundation of China.

He has published more than 400 journal papers, including more than 300 SCI papers and more than 50 top journals, and has been continuously selected into the list of Elsevier Xia Gao Cited Scholars, and has been invited to give more than 30 reports at international conferences.

He has won 5 international awards and 10 national awards.

Among all the people Ye Fei knew, except for those academicians, Sun Haitian's academic ability was the best.

The next day, Ye Fei said goodbye to his parents, got on a plane back to the sand dunes, and then took a car to Zhuzhou.

608 entrances!

Ye Fei called the other party according to the phone number provided by Academician Liu.

Soon, a man about thirty years old walked out of the 608 house.

The man walked up to Ye Fei and said with a smile: "Okay, I'm Professor Sun's assistant, my name is Yu Jie, and I'm here to pick you up." ”

Ye Fei shook hands with the other party and said, "Hello, Ye Fei." ”

After passing through the doorman at the door, the two walked inside.

Yu Jie said: "I'll take you to the place where you live first." ”

"Okay!" Ye Fei nodded.

The two chatted along the way, but Ye Fei didn't reveal too much personal information.

I just said that I just graduated from Zhonghu University with a doctorate.

Yu Jie nodded, looking at Ye Fei, he was about twenty-five years old, although a twenty-five-year-old doctor was rare, it was not unprecedented.

After arriving at the accommodation, they put down their luggage and went to see Professor Sun.

Professor Sun is a middle-aged man with a somewhat fat build, glasses, half-white hair, and sloppy hair.

When the two entered, Professor Sun was seriously studying the problem.

Yu Jie walked over and said, "Professor Sun, Ye Fei is here." ”

Professor Sun looked up at Ye Fei, pointed to the coffee table and said, "The literature is there, read it yourself." ”

With that, continue to bury your head in your research.

Yu Jie walked up to Ye Fei and said with a smile: "Don't mind, Professor Sun has such a temper." ”

Ye Fei nodded, it is too common for people in academic circles to have strange tempers, and Ye Fei was not angry because of Professor Sun's temper.

Moreover, in Ye Fei's opinion, Professor Sun's behavior is too normal, and it is not a strange temper.

Besides, he is here to study, and there is no need for people to be too enthusiastic about you.

Even if you have a relationship with Academician Liu, there is no need for people to be enthusiastic about you.

Ye Fei said: "I'm watching here?" ”

Yu Jie said: "There is an office next door, that is where I work, you can watch it there!" ”

"Good!"

Ye Fei took the literature and went to the office next door.

There were three people in the office, in addition to Yu Jie, there was also a man and a woman, Yu Jie briefly introduced Ye Fei, they and Ye Fei said hello to each other, and then they did their own things.

"And closed studies?"

After Ye Fei sat down, he opened the literature and thought in his heart.

There are two major problems in the continuum, namely the problem of the union and the problem of the existence of the wandering continuum.

Solving these two problems proves the continuum.

The literature is also divided into two parts, one is a parallel and closed set study, and the other is a wandering continuum existence study.

For the next few days, Ye Fei was reading the literature.

And Professor Sun never came to Ye Fei, not even a word of greeting.

Ye Fei is also happy to be idle.

It's been another week, and Ye Fei finally finished reading all the content of the literature.

"And the closed-set study, Professor Sun is almost finished, and he is short of the last step." Ye Feixin said: "As long as you find the n/2 set, you can prove this problem." ”

"I'll see if I can prove it."

Ye Fei found a pen and paper and began to calculate.

Professor Sun put down the pen in his hand and said, "It's finally done." ”

Looking at the chaos theory method of nonlinear dynamics that he had just completed, Professor Sun felt a little happy in his heart.

For scholars like him, there is a great sense of accomplishment and pride in completing research one by one.

"That's right!" Professor Sun said: "It seems that the director sent a person to show him the literature of the continuum hypothesis, and I don't know how he reads?" ”

With that, he stood up and walked out.

When Yu Jie saw Professor Sun coming in, he quickly stood up and said, "Professor Sun! ”

Professor Sun saw that Ye Fei was calculating, and he nodded.

Then he walked to Ye Fei's side, wanting to see how he looked.

"Huh......" he suddenly exclaimed, and said in surprise: "The last step has been proven?" ”

Ye Fei heard the voice beside him, he looked up and found that it was Professor Sun, so he quickly stood up and greeted, "Professor Sun, hello!" ”

"Hello!" Professor Sun nodded: "You actually proved the last step of the collection. ”

Ye Fei spared the back of his head, and said embarrassedly: "This is still the credit of Professor Sun, I will just make up for the last step." ”

"What's your name?" Professor Sun said.

"Ye Fei!"

"Oh!" Professor Sun nodded: "Ye Fei, it seems that you have studied set theory quite deeply!" ”

Although Ye Fei proved several difficult problems in set theory, he is well-known in set theory circles.

But there are still many people who don't know Ye Fei.

After all, there are too many scholars in this world, and unless you prove the eight conjectures of mathematics, or win the Fields Medal or the Nobel Prize, you can let everyone in the world know about you.

"It's fine!" Ye Feidao.

Professor Sun nodded, "Do you have any thoughts on the existence of the wandering continuum?" ”

He found that Ye Fei had some talents, so he wanted to hear Ye Fei's views on the existence of the wandering continuum.

Ye Fei said: "There are two problems with the existence of the wandering continuum, one is that when J(ƒ) is not connected, McMullen has proved that it can be quasi-conjugated to a polynomial's connected Julia set, and you have already proved this problem. ”

"The other is that if J(ƒ) is not connected, then the wandering branch of its Julia set is a single point or Jordan curve."

"I once read a paper on this issue called the structure of non-rotating Fatou fields and disconnected Julia sets of rational functions."

"There's a part of it that says Julia sets are rational functions and irreadjustable polynomials of Cantor sets to discuss parabolic perturbations, which I think helps a lot with this problem."

"Tell me!" Professor Sun's eyes lit up.

"The odd and even behavior of T(n)3 is the periodic ......"

Professor Sun nodded again and again after hearing this, feeling that what Ye Fei said was very reasonable.

Sure enough, mathematics still looks at young people.

The young man's brain is worse than himself, and the old man's brain is flexible.

Suddenly, Ye Fei stopped, and he said eagerly: "What about below?" ”

"It's gone!" Ye Fei shook his head and said, "I only want to go here." ”

"That's all?" Professor Sun said anxiously: "According to your derivation, you are just the last step, why don't you study it again?" ”

"Nope." Ye Fei shook his head: "No matter how much I study, I can't study anything." ”

Academics are like that, a problem can be stuck for a few years, or it can be stuck for a lifetime.

Professor Sun is itching, and the two questions of the continuous unification of the situation, and the closed set have been proven successful by Ye Fei.

There is also a wandering continuum of existence, and it is only the last step away.

As long as this last step is demonstrated, the existence of the wandering continuum proves successful.

Then the two questions come together, and the continuum proves successful.

The continuum is proving to be successful, and it is not far from proving the continuum hypothesis.

This is Hilbert's first question!

It still makes perfect sense to prove it, or at least to make a name for yourself.