It's September, and summer is in full swing.

The sun shone on the green plastic playground, and thousands of people stood neatly on the playground, receiving the baptism of the sun, sweat sliding from their heads, but no one reached out to wipe it.

On the podium in the center, a man in military uniform shouted in his loudest voice, without using a megaphone:

"Today is the last day of your military training! It is also the last time you and I will see each other! In this half-month military training, some of you have tanned, some have fainted, and some have even blisters on the soles of your feet, but you still persever! So, please give your best self a round of applause!"

After the man finished yelling, thousands of people on the playground applauded together, and then stopped at the same time, in unison.

The man on the podium continued to roar: "Most of you think that military training is very tiring, and it will not play a role in just half a month, and think that military training is useless, so why should we conduct military training?"

There was silence in the audience, and he then shouted: "Because, we have to use this half month of hard work to tell you that you have not yet been liberated! You must not relax! You still have a clear future! You must not lose your heart in a playful way!"

After the man finished yelling, the already quiet audience became a little quieter, as if even the breathing of the person next to him could be heard.

"You're here to study! You're not here to waste your time and swim against the tide of sorrow! You can rest, but while you're resting, others are training, kicking the right steps! When you train again, everyone is practicing military physical boxing! What do you compare yourself to others!"

"We're not your life coach! I'm a soldier! We're just telling you this in our own way!"

"I am here, on behalf of all the instructors, to pay tribute to you who have persevered! You have worked hard! Welcome to the university!"

As soon as the man finished speaking, the applause of the students below rang out like thunder.

The applause did not stop, and the man turned back and took the microphone handed to him and said:

"I hereby announce that the military training report performance will start now!"

Suddenly, the symphony sounded, and everyone's applause stopped instantly, and they began to line up at the fastest speed of their usual training, giving full play to what they had learned in the past half a month.

Half a month has passed, and today is about to usher in the end of the military training of the freshmen of Peking University.

Su Yun sat on a bench in the distance, watching the debriefing performance.

After listening to the instructor's words just now, for some reason, Su Yun's heart was touched, this was an emotion he didn't know.

After listening to the instructor's words, a wave of blood surged in his calm heart, but Su Yun didn't know what to do.

Su Yun just sat quietly, looking at the scene of the students' military training below.

The two-hour debriefing performance ended quickly, the steps of the freshmen were not so neat, and there were many flaws in the whole process, but Su Yun felt that the more he watched, the more interesting it became.

As if they had calculated the time, the instructors lined up in an invisible place for the freshmen at the end of the military training, and drove away in the most standard running posture.

The freshmen of the phalanx at the bottom did not see the platoon commander of their platoon for a long time, as if they all realized something, and they all looked sideways, looking for the figure that had accompanied them for half a month.

Military training, in the end, is over.

It's like a feast that never ends in the world.

Some girls stood there and cried, and some boys were also secretly turning their heads to the side and wiping the water from the corners of their eyes.

Su Yun stood up and left, and the confusion in his heart once again appeared.

"What are they for? Isn't it better to let them remember themselves at this time? If the students they bring with them have a chance to make them remember themselves in the future, won't they get a lot of benefits? At this time, just leave, fleeting, for what?"

Su Yun, who couldn't think of an answer, returned to his dormitory, A301.

As soon as I entered the dormitory, the room was nearly 100 square meters, and the walls around it were densely packed with numbers, letters, and formulas.

It had been half a month since the principal and the others came that day, and at this time, the room of 100 square meters and the living room were occupied by small blackboards.

Small blackboards were set up on stands, neatly arranged in the room, and each piece was densely written.

These days, people come to Su Yun's side every day to help replace the blackboard and transport the blackboard.

Half a month ago, Zhang Jianguo and Zhao Qidong discovered that Su Yun quickly called and reported to the Chinese Academy of Sciences after proving Goldbach's conjecture.

At first, the Chinese Academy of Sciences did not pay much attention to it, but just asked an academician of the Chinese Academy of Sciences to inspect it. As a result, the Department of Mathematics of the Chinese Academy of Sciences blew up!

The academician of the Chinese Academy of Sciences didn't have much thought when he first entered A301, but when he saw the dense stuff written on the wall, he was completely shocked.

Looking at Su Yun's proof idea, the academician of the Chinese Academy of Sciences immediately forgot to call the phone, followed the side and checked all the way, and finally found that this student's idea was completely feasible!

Although there is still a long way to go if it is to be thoroughly verified, there is at least one way to go!

When the academician checked the calculations for two hours and found that it worked, he immediately got up and went out of the room and called his superiors.

Not playing in the room is afraid of interrupting Su Yun's train of thought, and being interrupted is the most taboo thing for a mathematician.

The academician of the Chinese Academy of Sciences called the Minister of Mathematics, and by the way, he took a photo of the content he had verified and sent it over.

An hour later, the Minister immediately called the Under-Secretary-General at the next level, who in turn called the Secretary-General, and then the Vice-President.

In just a few hours, the Department of Mathematics of the Chinese Academy of Sciences was fried, and they came to inquire about Goldbach's conjecture.

Soon, a vice dean came to Peking University Library A301, and the next day, Peking University students found that the third floor of the library was completely blocked.

The elevator button to the third floor is directly out of order, and the stairs leading to the third floor are also locked, only occasionally a few people can be seen holding a few blackboards from the stairs to enter the third floor, and it won't take long to go in, and they will immediately come out with a few encapsulated blackboards, and then lock the door.

It wasn't until a week later that the chain on the entrance to the staircase on the third floor was opened, but the lock on the door itself was still not opened, stopping countless people who wanted to go inside to find out.

Su Yun thought of the way to prove Goldbach's conjecture, first of all, he first proved that any large enough even number can be expressed as the sum of two other numbers, and each of these two numbers is the product of 9 odd prime numbers.

Su Yun first set an even number N, although it cannot prove that N is the sum of two prime numbers, but it is enough to prove that he can write the sum of two prime numbers, that is, N=A+B, where the number of prime factors of A and B does not exceed a and b respectively.

The Goldbach conjecture can be written as "1+1".

Starting from "A+B", Su Yun first proved that "9+9" was established. Starting from this 9+9, as long as the encirclement is constantly narrowed, of course, the final goal is 1+1.

In the past half a month, Su Yun has been in A301 to prove "a+b" every day, in addition to watching the freshman military training on the playground for a while.

For half a month, the academicians of the Chinese Academy of Sciences really admired this student, and shouted every day that they were going to the library today to help move the blackboard.

Because in the past half a month, Su Yun has proved "9+9" in addition to "7+7" again.

It doesn't seem like a big deal, but in just half a month, it's amazing enough to push forward this problem that has plagued mankind for hundreds of years, even if it's the size of an ant.

Moreover, the academicians of the Academy of Sciences unexpectedly found that the speed of their calculations was not comparable to the calculation speed of the Peking University library student.

This simply shocked all their geniuses, which academician of the Chinese Academy of Sciences is not a genius? But this group of geniuses lost to a student...

Therefore, every academician of the Department of Mathematics of the Chinese Academy of Sciences shouted to meet this genius student.

Su Yun entered the bedroom and changed his clothes, when there was a sudden slight knock on the door outside, and if he didn't listen carefully, he couldn't even hear it.

Su Yun opened the door and saw someone coming, Su Yun said, "Academician Lu, come and move these blackboards, it's too occupied." ”

Academician Lu, a middle-aged man in his fifties, followed Su Yun into the room and said with a sneer: "Comrade Su, how is the progress?

A genius academician of the Academy of Sciences in his fifties called an 18-year-old college comrade, the picture is really funny, and Lu Guangbo, who is the head of the Department of Mathematics of the Chinese Academy of Sciences, does not want to do this.

However, people only one person has advanced the Goldbach conjecture that has plagued them in the entire world mathematics community, and he also heard that this teenager only proved the Fermat conjecture a few days ago, although the Fermat conjecture is still checked in the Chinese Academy of Sciences, but this makes Su who is hanging on his lips unable to speak.

Not only him, but all the academicians of the Chinese Academy of Sciences who came here didn't call Su the three words, some directly called him Su Yun, some younger called him Brother Su, and even a forty-year-old middle-aged man came up and said Brother Su, and directly called Su Yun drunk.

Su Yun said impatiently: "7+7 has been proven, all the blackboards are here, and the rest will be handed over to you." ”

When Lu Guangbo heard that it was wrong, he immediately asked, "What does Comrade Su mean by this?"

Su Yun threw the changed clothes into the washing machine, Lu Guangbo followed behind, Su Yun turned around and said:

"I want to do what I want to do, so there's not much time to verify and I'll leave the rest to you. ”

When Lu Guangbo heard this, he became anxious: "What! Comrade Su, what do you want to do? You can tell us at the Chinese Academy of Sciences, as long as you don't violate the law, I, Lu Guangbo, dare to pat my chest and promise you that I will definitely help you complete it!"

Su Yun shook his head: "My own business, I still want to do it myself." ”

When Lu Guangbo was about to say something more, Zhang Jianguo came in from outside.

Lu Guangbo seemed to see a savior, and immediately stepped forward to grab Zhang Jianguo and said: "Principal Zhang, come quickly! Quickly persuade Comrade Su, he said that he ......"

Zhang Jianguo stretched out his hand to interrupt Lu Guangbo, who was talking, pulled Lu Guangbo out of the door, and closed the door.

As soon as Lu Guangbo came out, he hurriedly said: "Principal Zhang, you have to talk about it, don't you say let me in, what a good seedling, it's a tyrannical thing not to do math work!"

Zhang Jianguo looked at Lu Guangbo, sighed and said, "Let him do it." ”

Lu Guangbo was unwilling: "But..."

Zhang Jianguo looked at the closed door: "He's still a child." ”