In Tsinghua University, every student is saying that he is a scumbag surrounded by top students, and every student firmly believes that he is the only scumbag in the entire Tsinghua University, which sounds as if the whole Tsinghua University is a scumbag, which makes students from other colleges and universities complacent when they hear it, it turns out that Tsinghua students are all scumbags.

But in fact, even if it is a small May Day holiday, the entire Tsinghua library is full.

A delicate embroidered tie was casually tucked into Han Sen's back butt pocket, and the delicate tie drooped down the slender trousers like a tail, making Han Sen, who was dressed in a neat suit, look a little more playful.

The students who came and went in the library, the students who came and went, and the teachers would subconsciously see Han Sen as a student.

The system disappeared, as if his task was completed, Han Sen didn't plan to read a book for a day today, after reading a book for ten years, he wanted to vomit.

But the inertia of ten years is very strong, even if he doesn't plan to read books, the place Han Sen chooses to hang out is still the library, and, while strolling, Han Sen picked up the book.

After ten years of reading and training, the biggest advantage is that he has ten lines at a glance, and after reading enough books, Han Sen can judge at a glance how serious an article is and whether it is worth reading.

After reading so many books, Han Sen admires Chinese scholars the most, and Han Sen feels that Chinese will never become the universal language of world academics, because if the common language of world academic is not English, but Chinese, then it will be over, and Chinese scholars will be able to wrap the whole world into it.

In the library, Han Sen flipped through the books one by one.

.......

"Your sister!"

Then, reading and reading, something went wrong, and Han Sen searched the entire library of Tsinghua University, and he found that the name Andrew Wiles was not in all the mathematical literature.

Han Sen panicked.

Andrew Wiles, who? Who is it?

He was a mathematician who proved Fermat's theorem, a puzzle that had plagued the mathematical community for three hundred years, and Hansen discovered that there was no Andrew Wiles, and that countless scientists in the mathematical community were challenging Fermat's theorem.

How is this possible?

What is Fermat's theorem? "When the integer n >2, the equation for x, y, z x^n + y^n = z^n has no positive integer solution"

It's that simple, but it's just such a simple problem, for more than 300 years, all mathematicians in the world have been challenging this problem, countless mathematicians have announced that they have proved Fermat's theorem, and they have been overturned countless times, until the British mathematician Andrew . The appearance of Wyles.

But now, Han Sen didn't even find Andrew. Wiles, Fermat's theorem has not yet been proven.

Han Sen's first thought was impossible?

Without the support of Fermat's theorem, how could modern cryptography support the development of the Internet! You must know that the foundation of the Internet is information transmission, and Fermat's theorem is indispensable for the support of modern cryptography, only strong enough encryption can information be transmitted safely, so as to ensure the development of the Internet!

"Dreaming, dreaming, must be dreaming." Han Sen thought he was definitely dreaming.

......

"Classmate, it's almost ten o'clock, and our library is closing!" The library teacher interrupted Han Sen's thoughts.

"Huh?" Han Sen was stunned for a moment, it was already dark outside, and said with a smile: "Oh, I'm sorry, I'm bothering to get off work." ”

"Hahaha, it's okay, I'm the one who disturbed your thinking." The caretaker teacher smiled and left

......

Walking out of the library, Han Sen subconsciously walked towards the dormitory, and after walking a few steps, he found that he was no longer a student, and there was no dormitory anymore.

Walked downstairs and sat in the car, in the carriage, Han Sen sat at a loss, muttering to himself: "Cuius rei demonstrationem mirabilem sane detexi. Hanc marginis exiguitas non caperet.”

Fermat, a French lawyer in the 17th century, was very fond of mathematics, and when he read a book in the library and saw something very interesting, he would write his thoughts in the blank space and leave this sentence "Cuius rei demonstrationem mirabilem sane detexi. Hanc marginis exiguitas non caperet.”

This sentence is very awesome: "I have a wonderful proof method, but the space here is limited, I can't write it, so I won't write it." ”

This is like a middle school exam, a math proof question is rare for you to scratch your brain, and then secretly open the answer analysis after class, full of nervousness from the full after-class analysis to locate the answer to the proof question, but immediately dumbfounded, because the answer is only a simple "omitted" word.

But it is such a sentence of Fermat, mathematicians in the world began to prove the problems left in Fermat's manuscript, some problems were proved on the spot, and some problems were proved for several years or decades, the most representative of which is "when the integer n > 2, the equation about x, y, z x^n + y^n = z^n has no positive integer solution", also known as Fermat's theorem.

For mathematics, the result is not important, but the process, and the later generations have proved Fermat's manuscript to promote the development of the entire mathematical scholarship.

For example, when Euler proved Fermat's theorem n=3, he invented imaginary numbers and expanded the number field, and then imaginary numbers played their role in many fields such as informatics.

Scientists have challenged Fermat's theorem long before the theorem itself.

And now, Han Sen has found that there is no Wiles in this world at all, which means that Fermat's great theorem has not yet been proven.

Topology!

Han Sen woke up suddenly, yes, yes, he wanted to look for topology, because the most expressive embodiment of Fermat's theorem is topology.

Han Sen instantly became excited.

"Blah blah blah ~~"

The mobile phone rang, and his mother's video call invitation interrupted Han Sen's excitement.

Opening the video, Han Sen looked at the old mother wearing the mask in the video, and said impatiently: "Hey, Mom! ”

Song Wenjing glanced at her handsome son, found that her son seemed to be in the car, and asked, "Son, did you buy a car?" ”

"Hmm." Han Sen nodded, and changed the camera to show his mother the interior of the car.

As a woman, Song Wenjing's knowledge of cars is only BBA (Mercedes-Benz, BMW, Audi) and sports cars, and after watching a lot of the video, she didn't see what kind of car an "L" was, so she asked Han Sen: "What kind of car is this!" ”

On the other side of the video, the voice of Han Sen's father, Han Zuodong, was heard: "Lexus! ”

"What is Lexus!" Song Wenjing was stunned for a moment, and immediately spoke: "Oh, you kid, why didn't you say it earlier when you bought a car, mom will add some money to you, and you can buy a BBA (Mercedes-Benz, BMW, Audi)!" ”

After thinking about it, the son of a colleague in the department bought a BMW and had a girlfriend the next day, Song Wenjing immediately said to his son: "Sen Sen, you must know that the core of Ma Zhe is materialist dialectics and historical materialism, and the core of materialist dialectics is the theory of contradiction, so, Sen Sen, you must clearly understand that the main contradiction at your current stage is to find a girlfriend!" It's not about reading! The family is not too rich, what Ferrari, Rambo fund! ”

"Lamborghini!" Han Zuodong, who was knocking melon seeds, reminded.

Song Wenjing said very unhappily: "Shut up!" Tomorrow I will sell your Audi, what Audi will the old thing drive, just buy a Volkswagen, and give the money to my son to buy a car! ”

Han Chokdong: The melon seeds are so fragrant.

Song Wenjing immediately smiled and said to her baby son: "Oh, where did I go?" ”

"Lamborghini!" At the end of the video, Han Zuodong, who was knocking on the melon seeds, reminded again.

Hearing her husband's reminder, Song Wenjing immediately spoke: "Yes, yes, what Ferrari, Lamborghini, etc., if you want, grit your teeth and your mother will buy it for you!" Isn't it tens of millions, grit your teeth! As long as you can find a good daughter-in-law, your mother will buy it for you! ”

Han Sen was really speechless, his mother was a doctor of medicine, and he only knew BBA and sports cars, and he was completely "car blind" to cars, and said: "Mom, Lamborghini doesn't need tens of millions, just millions!" ”

In the video, Han Zuodong heard a sound of surprise: "Wife, our family is so rich?" ”

Then there was an expected reprimand in the video: "Shut up! ”

An only child, especially an only child who has studied well since he was a child and is seriously cared for by his parents, is always impatient with his parents, and Han Sen is the same, he said: "Okay, Mom, I'm hanging, I have friends!" ”

Song Wenjing asked eagerly, "Sensen, men and women?" ”

Han Sen said impatiently: "Mom, go to bed early!" ”

"This little bunny!" Seeing the video of hanging up, Song Wenjing scolded, then ran into the sofa and asked her husband Han Zuodong: "Old Han, you said that our son will not have a boyfriend, right?" ”