"Yang Tian, I want to ask you a question. ”

Xu Yerong also didn't come to class today, when Yang Tian was not there, she had been skipping class, and now after hearing that Yang Tian came back, she came to class excitedly.

Then, by coincidence, he met Yang Tian in the corridor.

I haven't seen her for many days, but this girl is still radiant.

Wearing a blue slim long skirt, the delicate lace sets off the white legs, slender and straight, and the exquisite curves are completely outlined.

She pursed the corners of her lips and drew the strands of her hair, the lightness of her fingertips like the liveliness of an elf. There is still a faint aftertaste in the place where the hair is crossed, which makes people intoxicated.

After seeing Yang Tian, the girl held her little hand behind her back, and her delicate face was filled with a bright smile.

Yang Tian asked suspiciously, "What's the matter?"

"Hee-hee, you'll find out if you come with me. ”

Xu Yerong's pretty face had a sly look, and she couldn't help but say, taking Yang Tian's little hand and running to a pavilion.

Then he took out a stack of three-finger-thick A4 paper from his bag and said with a slight frown: "Well, I've been studying this problem these days, I've been calculating for a few days and nights, but I still can't figure it out, I know you're smarter than me, so I want you to help me." ”

Looking at Xu Yerong's originally bright eyes, a few strands of blood appeared at this moment, and the eye sockets also became like pandas.

Yang Tian was speechless: "How many days and nights have you not slept for?"

Xu Yerong snapped her fingers and calculated, and then said cutely: "It seems to be three days and two nights, hey, Yang Tian, help me, if you don't help me again, I'll go crazy." ”

Yang Tian was helpless, then picked up the file of the above operation, frowned, and said: "The four-color theorem? Are you sure you're not funny? Isn't this a math problem? ”

The four-color theorem, also known as the four-color conjecture and the four-color problem, is one of the three major mathematical conjectures in the world.

Its essence is the intrinsic property of the two-dimensional plane, that is, two straight lines in the plane that cannot cross without a common point. Many people have proved that it is impossible to construct five or more connected regions in a two-dimensional plane, but they have not raised it to the level of logical relations and intrinsic properties of two-dimensional.

In short, it is a very difficult mathematical problem, at the same level as the Goldbach conjecture that Yang Tian had solved.

This little girl still wants to solve it by herself, but she doesn't know that even if she burns out her brain, it is completely impossible to solve it.

Xu Yerong heard Yang Tian's question, and couldn't help but smile and said: "I joined the math club, and then volunteered to solve this unsolved problem within five days. ”

Xu Yerong held Yang Tian's arm with her little hand, shaking it constantly, and her pouting seductive mouth could hang an oil bottle.

Yang Tian said with a dark face: "You just think I can complete this conjecture?"

"I don't care, Yang Tian, you must help others, they have completed more than half of it, and now they are only the last step, but they can't break through the proof of this last step, you are smarter than me, you will definitely think of a way." ”

Xu Yerong kept being coquettish to Yang Tian, and a delicate little face was still rubbing in Yang Tian's arms.

Yang Tian felt the delicate body of the girl in his arms and the fragrant smell emanating from his body, and couldn't help but feel a little instated: "Stop, stop, okay, I'll help you." ”

"yes, hehe, Yang Tian, I know you're the best. ”

Xu Yerong smiled brightly, and then kissed Yang Tian's side cheek.

The warm touch, with a hint of softness and glutinousness, and the burst of fragrance.

Yang Tian was a little stunned.

And after Xu Yerong reacted, she screamed.

This scream almost punctured Yang Tian's eardrums.

He was a little speechless and said, "You kiss me, I didn't call you what to shout?"

"Big villain, that's different, I'm a girl, you······· Oops, it doesn't make sense, I must be crazy to be like this, Yang Tian quickly forgot about it. ”

Xu Yerong covered her pretty face that was red and almost dripping blood, and she wanted to get into the cracks in the ground.

She was just so happy that she didn't pay much attention.

Yang Tian felt funny, however, as soon as he laughed twice, he was pinched by Xu Yerong's little hand.

Yang Tian suddenly stopped smiling, then gasped and said, "You are really willing to work hard." ”

"Hmph, make you laugh at me. ”

Xu Yerong gloated with a look of schadenfreude, and then took out the paper and pen: "Oh, hurry up, there's no time." ”

Yang Tian held his forehead, and could only take what Xu Yerong wrote and study it carefully.

Xu Yerong just kept her hands on her cheeks, sat on the stone bench and lay on the stone table, looking at Yang Tian with a smile on her face.

The boy was much smarter than her, and he would definitely be able to crack the four-color conjecture

After Yang Tian watched it for a long time, he finally understood the principle of the four-color conjecture.

And Xu Yerong's research in the past few days and nights is all wrong.

He was about to tell Xu Yerong the news, but found that this little girl was already sleepy and drowsy.

Yang Tian shook his head and sighed, took off his coat, and then put it on.

He picked up his pen and began to do the math.

No one in the world has proved this conjecture, and it is said that a few decades ago, mathematicians in country M used computers to make 10 billion judgments in 1,200 hours.

But computer proof cannot give a convincing thought process.

So, it's still an unclimbable mountain in the world of mathematics.

And these are easy in front of Yang Tian.

His intelligence is like a demon, he has cultivated immortals in the Xuantian Continent for three hundred years, and the soul on his body is a real Heaven Breaking Immortal Emperor, and it is easy to solve a math problem.

When Xu Yerong woke up in a daze, she found the clothes on her back, and her heart suddenly warmed.

However, when he saw that Yang Tian was actually lazy there, he glared at Xing Yan angrily and said: "Classmate Yang Tian, you are still not my good tablemate, I asked you to help me prove the four-color conjecture, how can you ·······"

Before she finished her words, Yang Tian took out a piece of paper and pasted it on the door of her head and said with a smile: "Don't come to me for such a simple topic in the future." ”

"Oops, what a big breath. ”

Xu Yerong snorted, then gave Yang Tian another roll of her eyes, picked up the four-color conjecture that Yang Tian had proved on her smooth forehead and looked at it.

When he saw the early conjecture written by Yang Tian, he immediately frowned and said angrily: "Oh, Yang Tian, you made a mistake, did you follow my train of thought?" ”

Yang Tian said calmly: "All of your speculations are wrong. ”

After Xu Yerong heard this, she said angrily: "How is it possible, the early reasoning was reasoned by the mathematics professors of Peking University for the mathematics club, and all the mathematics professors of the entire Peking University participated, do you still think that all the professors are inferior to you?"

After thinking about it, Yang Tian nodded and said, "It seems to be." ”

Xu Yerong rolled her eyes angrily, she glanced at the time, and her face changed again: Oh, I won't talk to you, I'm going to the math club immediately, I was really killed by you today, and after I get there, I will definitely be ridiculed to death by them. ”

As he spoke, after packing up his things in a mess, he was about to leave with his bag.

Yang Tian said helplessly: "I have demonstrated the four-color conjecture for you, why don't you believe it, and when you arrive, you take out what I wrote, which will definitely shock the audience." ”

After Xu Yerong heard this, she almost fell, and she said angrily: "It took me two days and three nights to prove the last moment according to the ideas of those professors at Peking University, you didn't follow our ideas at all, it only took an hour, how could you calculate such a huge workload?"

The girl said so much, and the summary was only four words, I didn't believe it.

The corners of Yang Tian's mouth twitched, he wasted an hour in vain to prove such a complex math problem, this little girl didn't believe why he asked him to help just now?

According to Xu Yerong's departing back, Yang Tian was full of black lines.

Then, when he had nothing to do, he called Xiao Ling'er again and took her to the library to read and write.

This little girl doesn't know a few big words, so she wants to play, every time she goes to class, she can sleep better than him, and when she teaches her, she pretends to be cute and pitiful, and Yang Tian has a headache.

And at this moment, Xu Yerong finally came to the math club.

Looking at the door of the math club, Xu Yerong really didn't want to push it open. A few days ago, she was provoked by others, and threatened to prove the four-color conjecture after proving the world's three major mathematical problems.

However, the difficulty of the four-color conjecture was much more than expected, and in the end, she had no clue at all, and she originally asked Yang Tian for help, and the other party would help her solve it.

However, I didn't expect that the other party would only make trouble·····