Number theory is a purely theoretical mathematical study that belongs to the branch of pure mathematics. Even for mathematics majors, most colleges and universities do not have access to number theory during their university years, and only after further study will they have the opportunity to be exposed to this special field of mathematics.

While the scope of this field is not narrow, there are some interesting number theory examples that are interesting (hmm...... Of course, in the eyes of the vast majority of people, those examples are completely uninteresting), but it is undeniable that number theory is a very, very, very esoteric and difficult field. If you want to make a problem in this field, it can be so difficult that it can make people cry.

Math teacher?

I'm sorry, but no matter how many years you've been teaching middle school math, number theory is definitely something that can do it for almost every middle school math teacher in the world.

Not to mention, Yang Jin took a cursory look, and he already had a B number in his heart - the question in front of him was really ...... It's super hard!

"Hey, Xiaochao. Yang Jin decisively hung up the phone to the audience outside the venue: "It's troublesome, the difficulty of the number question is too high." If I can't solve this number problem, the infiltration mission will be a complete failure, and I'm afraid that I will be able to solve this problem at my level...... Huh? Do you have a way? Tell me about it!"

It's really a twist and turn, worthy of being a high-tech professional, can you even provide any reliable ideas at this time?

Uncle Chao muttered with his tongue on his side, and Yang Jin immediately followed the instructions of the black and hard old man to operate step by step.

"First of all, mobile phone networking...... How do you get traffic? I want to think about it, huh...... Oh, yes, open it this way, okay, it's okay!"

The first hurdle was crossed, and Yang Jin couldn't help but breathe a sigh of relief.

"Then, download a 'Where you can't scan, where smart learning APP'...... Download A: What????......? Yes, I usually don't use my mobile phone except for calling and texting, my son helps me figure it out...... Don't get excited, talk slowly!What's the app?store?Where can I find the store now????......? Oh found it, just click to download? Wait a minute...... Let's go!"

Call...... Yang Jin wiped the sweat from his head, he felt that the rush to download things just now was already the most difficult step in all operations.

"Finally, open the APP, scan the question to identify the ......" Sure enough, the next step is much simpler: "Hold up the phone, scan the question, snap, and wait for the answer to ......"

"How about Brother Yang?" Uncle Chao recommended his favorite in the proud tone of Columbus announcing his discovery of the New World: "I'll tell you Brother Yang, people have to keep up with the times and can't fall behind, the current software is simply too convenient, doesn't it just can't do math problems, and you can get the answer with a sweep." In the future, when you teach, you have to remember something, don't let children take advantage of the loopholes, hahaha! By the way, Brother Yang, is the answer out?"

The old brother Yang on the other side of the phone was silent for a moment, and his voice was a little gloomy and depressed manic: "What kind of dog day do you recommend...... Forget it, huh, is there any other way? For example, in the movie, I use my glasses to transmit, and the think tank at the headquarters immediately starts to brainstorm ideas?"

"Yes. Uncle Chao affirmed: "The glasses you are wearing now are, I have turned off the function, and you can turn them on at any time." However......" Uncle Chao's voice also became cautious: "As soon as we link to the database, the headquarters will immediately know where we are and what we do, and we will no longer be in a latent state." Headquarters if they know our information......"

"Will it be leaked?"

"The likelihood of a leak is not high, but the likelihood of losing face is extremely high. ”

Here, Yang Jin was silent.

Once the call to the headquarters is made and uploaded to the headquarters data center, the headquarters immediately discovers that the two old men have sneaked to the front line and are trapped in front of a math problem. Disrupting the plan of action, going to great lengths to rescue them, creating a chain reaction, all these things, Yang Jin can think of. And once such a situation really occurs, no matter how much impact it will have in the future, on the heads of him and Xiaochao, the name of "the old thing that doesn't do enough and adds chaos everywhere" can't be erased.

Indeed, he didn't care about the name.

Indeed, nothing is more important than life.

For the sake of a pitiful pride, to give up a safe and secure method of action, such a thing is not taken by wise men. But ah...... Why don't you want to take the right approach at this moment?

Yang Jin took off his glasses, closed his eyes and pinched the bridge of his nose, countless images flashed in his mind. Once, more, more, those treasured memories came flooding back. The pride of being a father, the confusion of being a father, the responsibility of being a father, the powerlessness of being a father, and the final struggle of being a father.

Drip, drip, the timer on the screen is running second by second, and the whole hour and a half of solving the problem does not seem to be tense, but in the face of the number problem in front of him, an hour and a half is only enough for number theorists to brush their teeth and have an appetizer.

This is really a super difficult question.

But ah...... Why is it that at this moment, there is suddenly a burning blood as if it has been ignited?

"I'll contact you again in an hour, and if something goes wrong, come and save me. After calmly arranging the way back, Yang Jin hung up the phone. He pursed the corners of his mouth, but said silently in his heart: "Xiaoqi, there is a sentence that Dad is very proud to say to you many times, and you might as well say it again today: At that time, in the entire county, there were only three people who could be admitted to the undergraduate." And you, dad and me, are the ones with the highest scores. No matter how big the place is, there is no comparison, and the score is not popular at that time. But now it seems that I am at least the top student in the college entrance examination county. ”

"The county champion in the college entrance examination is nothing, but there is one thing that I am more proud of than the county champion. My teacher, who was branded as a rightist during the Cultural Revolution, was beaten from Beijing to a local area, and finally fell to teach at a university, and he looked inconspicuous. But only a few of his blue-eyed disciples know that he is actually the apprentice of the great mathematician Hua Luogeng. That is to say—"

Hua Luogeng is my ancestor.

Chen Jingrun is my uncle.

Although I was later assigned to teach middle school in a small city for some political reasons, ah, I also had highlight moments in my father.

I used to love mathematics so much, studied hard in the university classroom, and dug deep under the guidance of the teacher. I was once praised by my teacher for having superhuman understanding and perseverance, and I definitely have a lot to do in the future. Under the guidance of my teacher, I entered the temple of number theory research, and I once got a notebook from my uncle—oh, I remember, Stephen Evenson, the familiar name is from that notebook.

Uncle Shi had met this Stephen Evenson at the International Congress of Mathematicians and had a brief discussion.

There is no record of the outcome of the competition, and there is no record of victory or defeat in the world of science. But that kind of pride between the lines can't be covered.

So—well, Yang Jin opened his eyes, and his gaze became cold and sharp again.

Staring at the subject in front of me, the long-term memories that had settled in the depths of my heart rolled up like bubbles, crackling and bursting.

Even if the problem in front of them is passed back to the so-called think tank, will they be able to solve it?

The problem in front of me, even if I don't pass it back and don't find someone to help, I, Yang Jin, really can't solve it!

Looking back, I saw that everything needed on the boss's desk next to me was ready. There was paper, there were pens, there were tools, there was no clutter. Yang Jin sat down reflexively, fell on the table and began to write.

The sitting height is just right, the light is just right, and the feel of the pen and paper is just right. It seems that although this Stephen Evenson has degenerated into the so-called Night Emperor, he has never forgotten the pride and self-control of being a mathematician.

Okay, very good, in this thrilling calculation, Yang Jin suddenly regained the feeling of his college days. At that time, the conditions were difficult and difficult, and the summer was hot and sweaty, but when I lay on the table and worked hard to write, there was excitement mixed with fanatical light in my eyes. As if he was playing with a peerless master, as if he was talking to his peers, every calculation symbol in front of him became the most beautiful note in the whole world.

The color has faded, the form has been eliminated, the time has been forgotten, everything is gone, all that remains is pure mathematics, and pure persistence.

As time passed, the threat of death loomed. However, Yang Jin's hands are still stable and his eyes are still sharp.

No, not still sharp, but sharper. Like a divine sword that has been rusted by time, it has faded little by little in the strict polishing and regained its edge.

Detonating on the spot?

you-mom and explode on the spot!

Soon, soon, I feel the tremor from the soul, the excitement from the bottom of my heart, the pleasure that runs through the whole body, this question is about to be solved!

THE_ZONE, open!

THE_SEED, open!

THE_LOCK_OF_DNA, open!

Today, I, Yang Jin, am going to break this number problem!!

——————

"Daddy!" Suddenly, a familiar voice came, calling Yang Jin, who was about to discharge in his eyes, back to his senses. Exiting the state of a supermathematician, Yang Jin raised his head a little dazedly, and then was shocked to find his white-haired daughter standing next to him. No, it's not just a matter of standing next to her, she simply came out of the secret door she wanted to open.

"You ......" Yang Jin was stunned and asked, "Why are you here?"

Yang Qi asked rhetorically, "Why can't I be here?"

"That Stephen Evenson ......"

"It's been done a long time ago, and it was cleaned up three days ago. Agent Okamoto's level is getting higher and higher, so we didn't have to work hard to find someone this time. ”

Sooner, sooner rather than later?!

Yang Jin's eyes were straight.

I'm ...... Did it, did it workless?

No, it's not just useless work.

Yang Qi was not as funny as usual, and her face was rare and grim: "Dad, why did you appear here?