Picking up the key, Su Yun did not continue to guide the aura into his body, because the aura was not a good thing for him to remember.

Out of the room, Su Yun continued to come to the B1 area, following the place in his last memory, Su Yun picked up a book and began to read it.

Compared with the introduction of aura, Su Yun prefers the feeling of burying his head in a book.

In the blink of an eye, the sky was getting dark, and time seemed to have been racing against people, and it was time for the museum to close at half past ten.

Su Yun inadvertently raised his head, and unexpectedly found that there were more and more people on the third floor of the library at this time!

Picked up the phone and looked at the time, there were less than two minutes before the closing of the museum, Su Yun was even more strange, what the hell is this person who has not decreased but increased?

Although there are more and more people, they all maintain the most basic quality, and no one talks about it, but they are all looking for something.

"Why do I feel like they're looking at me?" Su Yun was a little speechless, this kind of gaze made him feel uncomfortable.

However, it didn't last long, yesterday's long-haired senior sister appeared on the third floor and said loudly:

"The library is going to be closed today, so students who want to read, borrow, or study on their own should come back tomorrow. ”

After speaking, the long-haired senior sister did not stop, and turned around and went downstairs directly.

The crowd seemed to slowly disperse because of the notice from the long-haired senior sister, but when they went out, a few people began to discuss it loudly.

"It's that person, I look at the back and it's exactly the same. ”

"It should be him, and there are so many of us coming, he didn't even find out until the end, and besides, did his expression light up in the end!"

"Hahaha, that's right, that's right, his confused expression in the end is too funny. ”

"Yes, yes, and I can read a book so fast! It's like flipping a book!"

"Let's go, go back and leave a message on the official blog, and tell those people that we have seen other people's deities!"

"Official blog?" The conversation of the group fell into Su Yun's ears without omission, Su Yun quickly took out his mobile phone, clicked on Weibo, searched for the official Weibo of Peking University, and then saw the back of himself doing a question in the library last night.

Su Yun was speechless for a while, it was not enough to co-authored his own draft book, but he also had to use himself to promote it? Although he is not a star, he does not have any star effect.

However, there is no doubt that Peking University's propaganda this time is very successful, whether it is on the Internet or in reality, the outside world has long been discussing Peking University's "students who stay up late to study".

You know, what is the official Weibo of Peking University? It can be said that the news posted on it represents the entire Peking University.

Originally, the owner of this body didn't use Weibo, so Su Yun registered a Weibo.

When he was thinking about his ID, he suddenly felt that he was a bit like a star now, and although it was impossible to hold a concert in a stadium with 10,000 people, it was good that everyone knew how they felt when they were discussed like this.

In the end, Su Yun decided, typing with his fingers at a rapid pace, Weibo ID: I am a genius star.

This ID is currently unused and can be registered.

After this line of words appeared, Su Yun clicked the registration button.

After registration, Su Yun opened the official Weibo of Peking University and commented under the official blog:

"That's amazing!"

Of course, his humble comments quickly faded into the sea.

…………

Putting away his mobile phone, Su Yun continued to indulge in the ocean of knowledge, enjoying the beauty of the silence of the night.

The long-haired senior on the first floor locked the library door and prepared to go back to the dormitory.

On the way back, she suddenly turned her head and looked at the third floor of the library that was still lit up behind her, she picked up her mobile phone again and flipped out the text message that the director had sent her during the day today.

SMS content:

After a meeting of the school, Su Yun was given the qualification to live in the library, and A301 on the third floor was Su Yun's dormitory. The closing time remains the same at night, the electric switch on the third floor will be on as usual, and the rest of the floors will be closed when closed.

Although she had confirmed it many times, she still looked at the SMS number again, and after confirming that it was sent to her by the curator, she did not hesitate anymore and went directly back to the dormitory.

After the long-haired senior sister left, two figures appeared outside the library.

"Hey, Lao Li, look, the lights on the third floor are still on!"

"Ouch! What are you doing! You scared me to death you, I'm not blind, I can't see, I want you to say it!"

The man didn't mind, and continued: "In this way, the explanation for the closure of Peking University at half past ten in the evening is that the library is closed, otherwise you can sneak in and take two more pictures, and this first-hand news will be in hand." ”

The person called Lao Li also nodded: "Dare to shoot quickly, even if this is the latest news, tomorrow's draft will be settled." ”

The two cooperated very tacitly, and after quickly taking photos, they left Peking University.

Su Yun was constantly looking at the books in the library at this time, and his speed was very fast.

At a quarter past three o'clock in the evening, Su Yun suddenly picked up a large pile of books and entered his dormitory, took out a box of watercolor pens from his bedroom, took out a black one from it, and wrote on the blank space on the wall: Goldbach conjecture.

Su Yun began to flip through the book and write formulas on the wall at a rapid pace.

As for why it wasn't written in the notebook, it's because... He had brought a total of more than 20 books before he came, and just last night, even the new books that had not yet been written in his schoolbag were taken away by the librarian, for fear of leaving something behind.

So Su Yun had no choice, and suddenly thought that there seemed to be a box of watercolor pens in his suitcase.

There's no way around it

Su Yun thought of this, so he had no psychological burden and continued to write quickly on the wall.

The Goldbach conjecture of this world has not been proven, and even the proof ideas have not been clarified.

Goldbach's conjecture seems very simple, and Goldbach proposes two conjectures:

1. Any even number not less than 4 can be the sum of two prime numbers.

2. Any odd number not less than 7 can be the sum of three prime numbers.

And these two conjectures are obvious, and the second is a corollary of the first conjecture, so it is enough to prove only one of them.

However, this seemingly simple conjecture is not easy to prove.

There are many people who have made a lot of equations by enumeration to prove that Goldbach's conjecture should be correct.

But this is the realm of mathematics, and even if only one of the 100 million cases is wrong, then it is not true.

The most difficult part of this conjecture is that the natural numbers are infinite. It's not that you prove a thousand, ten thousand, a million cases to be true and that counts as a theorem.

Therefore, mathematicians are currently at a loss for the Goldbach conjecture, although countless mathematicians have tried to prove it in another way, but at present, there is no effective progress.

Su Yun began to write on the wall:

6=3+3 holds

8=3+5 holds

10=5+5 holds

……

……

100=3+97 holds

It wasn't until he wrote 100 that Su Yun stopped and thought carefully.

"If you just write it down like this, you should be able to prove it, but..."

Suddenly, Su Yun seemed to remember something, and quickly ran out and rummaged through Area A.

……

Two days later, on September 3rd, the registration for new students ended yesterday, and today is the first college activity for new students, military training.

At this time, after two days of busyness, Zhang Jianguo finally became free and decided to go out for breakfast, and then go to the library to see the "nail" student by the way.

Although he was directly admitted to the library, and the student didn't look like he was in trouble, the word "nail" was too sensitive for him, the principal, so Zhang Jianguo bought breakfast and went straight to the library.

Walking on the road, the students passing by greeted him one by one, and he nodded his head one by one.

Twenty minutes away, when I came to the library, Zhang Jianguo's buns and soy milk had already entered my stomach, put the garbage into the trash can at the entrance of the library, and then went directly to the third floor of the library.

There aren't many people in the library in the early morning, but occasionally you can see students looking for the books they're looking for.

Zhang Jianguo nodded with satisfaction and walked towards A301.

First of all, Zhang Jianguo knocked on the door, but after waiting for a few minutes, the door never opened. He went down to the first floor again, found the schoolgirl who was in charge of opening and closing the door every day, and asked:

"Classmate, when you came to open the door in the morning, did that student go out of the library that night?"

When the long-haired senior sister saw the principal coming to ask, she immediately stood up and replied, "I came very early in the morning, and I have been here until now, and I haven't seen that classmate go out." ”

After saying thank you, Zhang Jianguo felt a little uneasy in his heart.

"Isn't this going to do something again? I'm not going to retire in a few years, don't do anything for me!"

Zhang Jianguo immediately said: "Hey, Lao Zhao, come to the library, what are you doing? What else can I do when I come to the library? Yes, it's the nail, remember to bring the key to the A301! Okay, hurry up!"

After hanging up the phone, Zhang Jianguo stood at the elevator door and waited for Zhao Qidong.

It didn't take long for Zhao Qidong to take the key, and the collar of his clothes was not smoothed, so he came in a hurry.

Just kidding, this is an accident, but something is wrong in his library, can he not be in a hurry!

Seeing Zhang Jianguo waiting for him at the elevator entrance, he nodded, and the two quickly came to A301 on the third floor.

Zhao Qidong took out the key, opened the door of A301, and silently recited "Don't have an accident, don't have an accident" in his heart at the same time, and the moment the door opened, the scene directly made them stay at the door.

"This ......"

Zhang Jianguo opened his mouth, not knowing what to say.

At this time, Su Yun was standing on chairs stacked on top of each other, and these chairs were stacked on top of each other.

And Su Yun was holding a watercolor pen, and a long string of styles was written on the top of the roof, which was half blank and half dense.