"Ladies and gentlemen, welcome to Huaguo Beihang Airlines flight AX691 from Yangshen to Beijing....... The plane is about to take off, and now the cabin attendants are conducting a security check. Please sit in your seat, fasten your seatbelt, and put away the seat back and table. Please ......."

On a plane flying from Yangshen to the capital, Cai Zhou sat upright in his seat.

Cai Zhou looks to be in his fifties, with a mouth full of stubble, half a grain of rice sticking to his stubble, his hair is dirty, and the clothes he wears are also folded and wrinkled, and the whole person is like a bad old man who asks for food.

But his eyes were sharp, his facial features were upright, he had a Chinese face, his hands were on his chest, and he was sitting there upright, and at first glance, he still looked a little majestic.

Cai Zhou's appearance is actually for a reason.

He is a mathematician, and in more detail, he is an academician of the Yangshen Branch of the Chinese Academy of Sciences!

What is the place of the Chinese Academy of Sciences? It is the most authoritative place in the country and the place where scientific forces are most concentrated!

In the Chinese Academy of Sciences, if an academician is pulled out casually, it is a genius among geniuses who can lead a team to engage in scientific research alone.

If you want to enter the Chinese Academy of Sciences, you must be recognized by nearly 2/3 of these geniuses, so that you can be recognized by the Chinese Academy of Sciences and enter the Chinese Academy of Sciences.

One can imagine how heavy an academician of the Chinese Academy of Sciences is.

And Cai Zhou is such an academician of the Department of Mathematics and Physics of the Chinese Academy of Sciences.

There is no doubt that he was a mathematical genius who devoted all his life, even his life, from childhood to old age.

Unkempt appearance?

In his eyes, that's all a fart!

For scientific maniacs like them, it's so normal to be really busy, not having a full meal for three or five days, and not taking a shower once a month or two! Where is the time to tidy up their appearance?

Today, he had just come out of the laboratory, and after completing a scientific research project that had plagued them for months, he couldn't wait to get on the flight to Beijing.

If you want to ask why, it was about two months ago, when an old friend approached him for a set of multi-digit math quick arithmetic questions, saying that he was going to test a student at their school.

As an old friend, of course, he wanted to disgust his old friend.

So he found a copy of the most complicated set of quick arithmetic problems in his hand and sent it to his old friend.

As a result, just when he was about to laugh out loud and greet this old friend to complain, he actually said that the student was finished with a page before five minutes were over!

He couldn't help but be furious at once, thinking that he had dedicated his life to the field of mathematics, and he had never heard of anyone who could finish that page of quick arithmetic in less than three minutes.

Back then, France's world speed arithmetic champion also took a full 10 and 8 seconds to complete a page.

Three minutes? He really didn't believe it at all.

If it was someone else, he would only scold S13 angrily and then ignore it, but it was his old friend who said it.

He knew his old friend very well, and he would never joke with himself about mathematics, because he knew that mathematics was the lifeblood of his life.

But if he hadn't seen it with his own eyes, he wouldn't have believed it.

Therefore, he had already come out of the laboratory, so he hurriedly bought a plane ticket from Yangshen to the capital, and prepared to go over to find out.

A few hours passed quickly on the plane, and when he got off the plane, he took out an old Big Brother mobile phone from his pocket and clumsily poked the numbers on it with his index finger.

"1...8...3...4..1....... it's good!"

The call came, and it was quickly connected, and he shouted:

"Hey, come and pick me up, I'll go to the capital!"

The other side was surprised:

"What are you talking about?

The people around the airport looked at him, and he was not embarrassed, and continued to say loudly:

"Don't talk nonsense, come and pick me up!"

"Why did you get to the capital?

"No, those old things, they said that unless I went to the headquarters of the Academy of Sciences, they wouldn't agree with me to go out of the Yang Shen!

“....... Khan! Don't move at the airport, I'll be right there! Listen, don't move!"

"Come on!"

..........

Two hours later.

"I said the country, why are you so slow? My legs are softened!"

In Zhang Jianguo's car, Cai Zhou complained dissatisfiedly.

"Ouch! I'm not blocking the road! This capital, no matter how many rings, it's all one word, it's blocked to death!"

"That's four words, you're afraid you're an old fool!"

When Zhang Jianguo heard this, he smiled and said:

"You really haven't changed at all, by the way, let's not talk about anything else, why did you suddenly come to the capital?"

"Hmph, old man, I'll take a look at the one you said, the student who made my set of quick arithmetic problems in 'three minutes'!"

Cai Zhou's face was full of contempt, and the three words in three minutes were particularly heavy.

Zhang Jianguo was stunned:

"Yo! you're here to eat a book?"

Cai Zhou said disdainfully:

"Look at what you said, let me see the student you said first! If you lie to me, I, Cai Zhou, will fight hard with you!"

Zhang Jianguo said with a smile:

"Okay! Let you, Cai stubborn, see and understand, our students of Peking University!"

..........

Under the Peking University Library.

Zhang Jianguo and Cai Zhou got out of the car, originally Zhang Jianguo planned to send Cai Zhou back to his house first, let him take a bath, change into clean clothes, but this old stubborn, if you don't listen, you must first take a look at the person who made his question in three minutes.

He couldn't help it, so he had to drive him to the library.

"Why are you here to fart, you can't even be loud in the library!"

Cai Zhou got out of the car and saw that it was the library, so he couldn't help but complain.

Since his school days, he has been arguably the kind of person who hates libraries the most.

There are a lot of books in it, and there are many people who like to learn, but in this environment, they can't speak!

He has never been a person who can hold his own thoughts, he will want to shout out when he has any inspiration, discuss it with others, and can't wait to fight with others for life and death.

But in this library, you just fart a little louder, and a bunch of people will stare at you, and you will tremble when you see it.

Zhang Jianguo knew that he hated the library, so he said:

"This student lives here now, what's the matter? To go or not to go?"

Cai Zhou hesitated for a while and gritted his teeth:

"Go!"

When I walked into the library, sure enough, it seemed to be separated from the noisy world outside.

Cai Zhou followed behind Zhang Jianguo, looking left and right a little unnaturally.

Soon came to the third floor, A301, Zhang Jianguo knocked on the door, and after a long time, no one came to open the door.

"What's going on, huh?"

Cai Zhou put his hand to his mouth and whispered into Zhang Jianguo's ear.

Compared to his age, his action was really funny.

Zhang Jianguo suddenly thought of something and said:

"Let's go, let's go to the sixth floor. ”

The two got on the elevator again, pressed the button on the sixth floor, and the elevator went up quickly.

But when it was almost there, Zhang Jianguo and Cai Zhou's faces changed at the same time.

Cai Zhou:

"What's that sound? Isn't the library silent?"

Zhang Jianguo:

“.........”

Before they reached the sixth floor, the voices from above came down.

"Hahahaha! Plum, come over to me! I'll figure it out first!"

"What? so fast? impossible! I'll take a look!"

“.........”

"The guy with the hat over there, I'm back!

"Hehe, dead fat man, don't say anything like you can refute me, it's a mule or a horse, come and slip!"

"Come on, come on, if I can't fight you today, I won't come to the library for three days!"

“........”

"You can't use the Fourier transform here!"

"Why not? Look here, here, and here, I'll explain it all!"

"Hehe, look at you first, your X in this place has a limit, right?"

"Yes, there is a limit, and that doesn't mean anything. ”

"Hahaha, you're so stupid, you don't see it, then you look at this formula. ”

"Damn! How did I forget this!"

"Tsk, tomorrow's breakfast will be handed over to you, don't be late!"

"Cut, got it, isn't it just breakfast? ”

“.........”

Zhang Jianguo:

“。。。。。。。。 ”

Cai Zhou looked excited:

"The country smashes! this.... This... Is this a library?"

Zhang Jianguo was speechless, what's going on?

Why haven't I seen this library for a week, and it's become a vegetable market?

When Zhang Jianguo felt a little headache, the sixth floor arrived.

The elevator door opened, Zhang Jianguo was dumbfounded, and Cai Zhou's eyes lit up, as if he saw a new world.