At night, Ye Fei lay on the bed and turned on the system.

[Mission: None.]

Stamina: 150

IQ: 129

Function: Integration: Lv0 (0/100)

Level: 0

Points: 105】

Ye Fei has completed two tasks, the first task gets 5 points, and the second task gets 100 points.

But he never added points, because a little bit of physical fitness and IQ requires a hundred points, and a little bit of function requires ten points.

The points he has obtained now, adding a little physical strength or IQ to help him can be ignored, and the function cannot be upgraded, and the improvement of not being able to upgrade is equivalent to nothing.

That's why he's been saving points.

"The singular cardinality has proven successful, and it's time to move on to the next mission."

"The mentor has been urging me to cooperate with him on the issue of the Minimal Tower."

"Now that I have nothing to do, let's study the Tiny Tower!"

The problem of minimath towers appeared in 1940 and is one of the core problems of set theory.

The question is whether the two continuum cardinal invariants p and t are provably equal under ZFC.

This question is the oldest public problem in cardinal invariant theory.

If it proves successful, it will play a huge role in promoting the development of force theory.

ZFC, the full name is called ZFC axiom system.

It is the ZF system proposed by Zemelo and Frenkel, and on this basis, the axiom of choice is added to form the ZFC axiom system.

It was the first axiomatic set-theoretic system and has very extensive applications in set theory.

The theory of force and force, also known as the force method, is an important method for constructing extended models in axiomatic set theory research, which was created by Cohen in 1963 to prove the independence of the continuum hypothesis.

To put it bluntly, both the singular cardinality problem and the minimal tower problem are of great help in proving the continuum hypothesis.

Ye Fei said about establishing tasks.

[Mission: Prove the problem of the smallest tower.]

Details: Whether the two continuum cardinal invariants p and t are provably equal under ZFC

Reward: 100 points]

"Another 100 points? It seems that the difficulty is the same as the singular cardinality. ”

From the second day, Ye Fei and Lu Yishan worked together on the issue of the extremely small tower.

After fully studying Professor Lu Yishan's previous research, Ye Fei made some additions, and the cooperation between the two made the research very fast.

Ye Feidu sighed: "Fighting alone is really not as fast as the cooperation between the two." ”

If it used to take two months to study the singular cardinality by myself, but if it was a two-person cooperation, the speed would be much higher.

Ye Feixin said: "At this rate, it can be proved in two months at most." ”

Professor Lu was very surprised, he didn't know if he didn't cooperate, and he was shocked when he cooperated.

"Is this a tutor taking a student? Or do students bring mentors? ”

Many of Ye Fei's ideas are very novel, if it weren't for years of studying the problem of the extremely small tower, he would almost not be able to keep up with Ye Fei's rhythm.

Professor Lu is in pain and happy.

The happy thing is that the research speed is very fast, and the painful thing is that he can't keep up with Ye Fei's rhythm anymore, and he needs to supplement his knowledge.

"No, I can't work twelve hours a day, just six hours, and I have six hours left, and I'm going to study."

Professor Lu was forced to do nothing, otherwise he would really not be able to keep up with Ye Fei's rhythm.

Originally, he wanted to pull Ye Fei to join his own topic and let Ye Fei follow his own rhythm.

It's good now, it's because I have to follow Ye Fei's rhythm.

But the rhythm seems to be too fast to keep up, he has to slow down the rhythm, have time to study every day, and try to keep up with Ye Fei's rhythm.

"Why didn't you know he was so perverted before?" Professor Lu complained in his heart: "If Ye Fei knows my ability, will he look down on me?" ”

"No, you can't be seen."

Ye Fei didn't see Professor Lu's ability.

One is less experience.

Second, the cooperation time is short.

The third is that I am too involved in research and have no energy to pay attention to it.

Fourth, he himself is also studying and researching, and his background is shallow.

"Professor Lu's ability is still quite strong, and many views can't be learned online, which is his private collection, but after I study, I will learn the knowledge on the Internet, which will help me even more."

In the blink of an eye, a week has passed, and tomorrow is the day of the International Forum of Young Scientists.

Professor Lu took a long breath, Ye Fei went to participate in the forum in the past few days, and he had to use these few days to supplement his knowledge, otherwise he was afraid of dragging Ye Fei back.

On the morning of November 16, at the gate of Zhonghu University.

Professor Lu and Ye Fei were standing at the gate of the school, and suddenly, Professor Lu waved his hand and said, "This ......"

Soon, a young man in his mid-thirties approached.

The young man looked very gentle, with fair skin, tall and thin stature, wearing a pair of glasses, carrying a black briefcase in his hand, and wearing a suit.

"Professor Lu!" The young man walked up to Professor Lu and said.

Then he looked at Ye Fei and said with a smile: "You are Ye Fei, I have heard calluses from your name in the past few days." ”

He stretched out his hand and said, "Hello, my name is Dong Siyuan." ”

"Hello!" Ye Fei shook hands with him.

Professor Lu said: "Ye Fei, Dong Siyuan is also a graduate of the Department of Mathematics of our school, he is a student of Professor Liu Yisheng, and he went to the forum with you this time. ”

Ye Fei smiled: "Hello senior, please help me next." ”

Dong Siyuan said with a smile: "Where is it, I am a leader, and the forum is a stage." ”

"Alright." Professor Lu said: "Don't talk nonsense, you still have to catch a plane, hurry up!" ”

Taking advantage of Ye Fei's lack of attention, Professor Lu quietly said to Dong Siyuan: "Come back as late as possible." ”

Dong Siyuan was stunned, not understanding what Professor Lu meant.

But Professor Lu didn't explain, urging them to hurry up.

After more than three hours, they went to stay in a hotel near the International Forum, which had already been booked by the Forum, and all scholars could show their invitations and stay for free.

Dong Siyuan said: "This time, more than 1,000 scholars from 15 countries participated in the forum, and almost all Asian countries participated. ”

"The forum is divided into five lecture halls, which are mathematics, physics, biology, materials and energy."

At half past one in the afternoon, they arrived at the forum on time, and after the doorman had read the invitation, they walked to the math lecture hall.

Dong Siyuan said: "Generally, there are not too many people who come to participate in the mathematics forum, and a hundred people are considered good." ”

"Why are there so few people?" Ye Fei asked, "Isn't mathematics the mother of all disciplines?" ”

"The mother of all disciplines." Dong Siyuan nodded and said, "But other disciplines can see practical things better than mathematics." ”

"For example, aerodynamics in physics can help the development of aviation."

"But the math is about helping aerodynamics."

"So, people want to see something actual rather than a set of numbers or formulas."

"Unless there is a major breakthrough in mathematics, it will attract a lot of attention."

Ye Fei nodded.

As they spoke, they came to the door of the math lecture hall and pushed the door in.

"Uh......" Ye Fei looked at the lecture hall in amazement.

I saw that there were more than 500 people in the lecture hall at this time.

Ye Fei asked in surprise: "Senior, it seems that there are more than a hundred people!" ”

Dong Siyuan nodded and said, "It seems to be so, there may be some accident!" ”

He pulled a young man beside him and asked, "Hello, why are there so many people today?" ”

The young man looked at Dong Siyuan in a daze and asked, "You don't know?" ”

"What do you know?" Dong Siyuan said suspiciously.

"Ye Fei!" The young man said: "We heard that Ye Fei was going to make a report, so we all wanted to come and see him, and I heard that he is only 22 years old this year, and we just want to confirm whether this is the case." ”

"The people here are all from the top universities and institutes in Asia, and a small number are from the Americas and Europe."

"We're all young and we're not convinced that he's 22 years old."

After the young man left, Dong Siyuan looked at Ye Fei with some tears and laughter: "It seems that you are under a lot of pressure today!" ”

Ye Fei smiled bitterly and shook his head: "I didn't expect it to be like this." ”

They sat down in a random spot, and in order not to attract attention, they found a corner to sit down.