Xu Yuan never thought that his granddaughter's classmates would be able to demonstrate successfully, because even the most authoritative mathematical power in the country had painstakingly studied all his life and could not find a clue.

He finished the half page of Xu Shirou's paper, and asked a little stunned, "Why is this only half written?"

Xu Shirou also said with some pity, "The remaining half was erased by the teacher, and I haven't had time to copy it yet."

"Oh!" Xu Yuan took out his glasses from his pocket, put them on, and took a closer look.

The more he observed, the deeper his brows locked, and before he knew it, two hours had passed, and Xu Yuan looked at half a page of paper and fell into a daze.

Xu Shirou finally couldn't help but ask, "Grandpa, what's wrong with you?"

Xu Yuan came to his senses at this time, his brows locked, both puzzled and a little excited.

Looking at this half page of paper, it was like encountering a treasure, and said: "Interesting, interesting, this question can still be argued like this? ”

He cupped his eyes and said, "Xiaorou, you go to sleep first, grandpa will help you prove that the Goldbach conjecture written by your classmate is not correct." ”

Xu Shirou nodded helplessly and said, "Then grandpa, you should rest early." ”

Nothing was said all night.

When Xu Shirou opened the bedroom door the next day, she saw Xu Yuan in the living room very excited, and he was holding the phone and talking excitedly.

"Lao Li, it's me Xu Yuan, why am I looking for you if it's okay? You hurry up to Yancheng, hurry, be fast, I accidentally saw the argument of Goldbach's conjecture, no, no, no, this argument I promise as a professor of mathematics, it may be the closest to success. Yes, I can't prove success myself, bring people, bring more, it's better to bring your team over. ”

Xu Shirou asked suspiciously, "Grandpa, what's wrong with you?

Xu Yuan hung up the phone and laughed: "Xiaorou, do you know that the argument method on this half piece of paper may be the closest to the end of Goldbach's conjecture?"

"Huh?"

Xu Shirou opened her mouth wide, with a look of disbelief, she asked: "Grandpa, are you mistaken, this is just written by one of my classmates, he is only in his third year of high school, how can he take off the most dazzling crown in mathematics in one fell swoop?"

Xu Yuan lifted his glasses and suppressed the excitement in his heart and said: "No, no, I can't be sure that the argument written on this half of the paper is correct, this involves a huge amount of calculation, and I can't complete the calculation alone." ”

Xu Shirou was shocked again, her grandfather is a retired professor of mathematics at Tsinghua University, as long as he has the title of professor, none of them are wine bags and rice bags, what is he talking about now?

How profound is this argument written by Xu Yun?

Before, she always thought that the other party just wrote casually and didn't take it seriously, but now it seems that things are not so simple, her grandfather called Li Song over, in order to calculate whether this argument is correct together.

Who is Li Song, that is a figure at the level of the entire domestic mathematics community, and the mathematical world can shake three times if he stomps his feet.

Moreover, listening to her grandfather's tone just now, it seems that the two of them together can't complete a huge amount of calculus, and they must find a math team to come over.

Xu Shirou was very curious, she swallowed hard and asked, "Grandpa, besides Grandpa Li Song, who else did you invite over?"

Xu Yuan was a little proud and said: "Half of the top mathematicians in the domestic mathematical circle. ”

Xu Shirou felt dizzy and almost fell unconscious.

It's just a junior in high school who writes and draws, is it really necessary to make such a big move?

Looking at the grandfather who was at a loss and excited, Xu Shirou felt that he was like a child with a fresh toy at the moment.

She couldn't help but be a little worried: "Grandpa, you better sleep, you didn't sleep last night, it's not good for your health." ”

Xu Yuan laughed and said: "I'm not sleepy, I'm so excited, Xiaorou, you don't know what it means for our domestic mathematical community if we prove that this method is successful, if we succeed, we will win the Fields Medal in the world mathematics community, which has a status comparable to the Nobel Prize." ”

Xu Shirou was a little puzzled: "Then why can't you directly win the Nobel Prize in Mathematics?"

Xu Yuan smiled and said, "Because the Nobel Prize has not set up a mathematics prize at all." The Fields Medal is the greatest recognition of mathematicians in the world. ”

Xu Shirou nodded as if she understood.

--------

When she arrived at the class, Xu Shirou deliberately paid attention to Su Yun's seat and found that he hadn't come yet.

She was really curious about where the other party got the Goldbach conjecture argument.

Before, she thought that Su Yun wrote it by herself, but from the perspective of her grandfather's attention, it didn't seem to be that simple, and the other party definitely couldn't write it by herself, maybe there was a master behind him.

Su Yun and Yu Bo walked to the door of the classroom, Yu Bo held his head, it seemed that he had not completely woken up from drunkenness, he wailed: "It's over, Su Yun, I'm not in a state of dizziness today, and I will definitely fail the exam." “

Su Yun spread his hands helplessly and said, "It's because you kept drinking with me yesterday, and you still don't admit defeat." ”

Yu Bo said with a look of grievance: "Who knew you could drink so much, two cases of beer, twenty-four bottles of you, one bottle at a time, are you still human?"

Su Yun smiled and said, "I am an immortal, do you believe it?"

Yu Bo rolled his eyes.

The two were about to approach the classroom when they saw a beautiful girl running over.

"Su Yun!"

The girl couldn't help waving at it, which made Yu Bo on the side look jealous.

He said in a slightly sour tone: "I said Su Yun, Lin Xiaohua seems to be interested in you, do you accept her wishes." ”

Su Yun glared at him and said, "Don't talk nonsense!"

Lin Qing ran to Su Yun and said, "Su Yun, what a coincidence!"

Her pretty face was slightly red, because the running just now consumed most of her physical strength, she was panting slightly at the moment, and there were a few beads of crystal sweat between her nose. It looks cute and cute.

Yu Bo didn't think it was a big deal, so he smiled and said: "Lin Xiaohua, we are all in the same class, what's the coincidence in going to the classroom together, besides, I came with Su Yun, why didn't you say it coincidentally?"