&bsp;"My guess is the five-color conjecture. Once, when I was studying the world map, I discovered a curious phenomenon, that is, I found that each map can be colored with five colors, so that countries with common boundaries can be embraced with different colors."

This is a world-wide mathematical problem, also known as the Five-Color Conjecture, which directly made Rajskov become a world-class mathematical master.

"Now I'll prove my guess to you!"

Then Rajiskov wrote directly on the blackboard, and the blackboard was filled with scattered words.

"This is my proof, and it is also the greatest proof in the world. My conjecture has been included in one of the top ten mathematical conjectures in modern times in the world. This is my greatness. Let me explain to you why this solution is so. Of course, I guess you don't understand it either."

Rajiskov said something very ugly, but his own strength is there. People in China are not able to ask global mathematical problems, so although people are angry, they do not express anything.

But just as Rajiskov was speaking freely, a very disharmonious voice sounded. Liu Zhicheng stood up lazily and said to Rajiskov on the podium: "What kind of bullshit theory are you? You don't need five colors at all, you only need four colors."

After seeing Liu Zhicheng appear in the crowd, Zhou Xiafei finally breathed a sigh of relief. She thought that Liu Zhicheng had forgotten about this or simply overslept.

It is normal for Liu Zhicheng to forget things, and it is even more normal for oversleeping. Zhou Xiafei didn't feel curious about Liu Zhicheng's lazy personality.

"Ignorance child! Why do you question my guess? What qualifications do you have to talk to me!"

Rajskov was talking about the exciting part, but was suddenly interrupted by Liu Zhicheng, so Rajskov was very angry.

"He may not have the qualifications before, but from now on, he has it, and he is the youngest professor and mathematics professor at Kyoto University!"

The old president of Kyoto University suddenly came on stage and said to Rajskov.

"you!"

Rajiskov pointed at the nose of the president of Kyoto University, and did not set off if there was any fire.

"Okay, go down, think you have proposed a guess and are a math master, but you don't even know whether the guess you put forward is correct or not. What kind of math master are you doing!"

Liu Zhicheng's words are very bad.

After hearing this, Rajiskov said to Liu Zhicheng angrily: "Okay, if you have the ability, you can just use four colors to prove it. Come on! If you can't prove it, I want you to kneel down to apologize to me in public!"

"If I can prove it, then you and your people will get out of China forever. China doesn't need a arrogant person like you."

Liu Zhicheng also said to Rajskov.

"Okay! One word is determined!"

Rajskov doesn't believe that the young man in front of him can have the ability that only the world's top mathematics masters can have, not to mention that even the world's top masters cannot prove his theory.

"Okay, wait and see."

After stretching lazily, Liu Zhicheng slowly walked to the podium. He glanced at the blackboard full of words and said to a classmate below: "Can you come up and wipe all these messy things for me!"

The student was already unhappy about Rajskov, so he walked up and wiped all the words on the blackboard.

When the student went down, Liu Zhicheng asked him, "How does it feel to wipe all those words?"

"Cool!"

The student thought about it and replied.

"Okay, I'll show you what is the four-color conjecture, not the five-color conjecture."

After saying that, Liu Zhicheng started writing on the blackboard.

Assuming that any polyhedral face, the face, is called a multi-point body, the point body, the four-point body (tetrahedral) color, each face is adjacent to other faces, the five-point body can be regarded as the four-point body and add a point.

Of course, you can think against the contrary, the five-point body reduces one point and becomes four-point body. Similarly, the point body, and we can know that any point body can change from the point body, and of course, you can think against the contrary.

The following analysis shows that if the four colors of the point body can be dyed, and if one more point is added to the point body (or the process of point body to point body), it is actually equivalent to adding a pyramid (or like a pyramid, the bottom surface is uneven, the bottom surface has characteristics and cannot contain points, otherwise the point will be reduced).

Because it is reversible, it can definitely be transformed from the point body to the point body, the base of the pyramid and the disappearing surface of the point body.

The new adjacent relationship has not changed fundamentally.

The face of the disappearing face of the point body is reduced by one face, and another face is added. The side of the cone is reduced by one face, adding one face. Because of the triangle, the cone will not introduce five sides adjacent to each other, and the face of the disappearing face of the point body, the side of the cone, and the other three sides.

These five sides will not appear adjacent to each other (because the side of the cone is only adjacent to three sides), the face of the face of the disappearing face of the point body and the other four sides (not including the side of the cone) will not appear (known conditions). The relationship between the face-to-face adjacent has never undergone fundamental changes, that is, the phenomenon of "five sides are adjacent to each other" will not appear.

Four-color theorem: The plane is arbitrarily subdivided into unoverlapping areas. Each area can always be marked with one of the four numbers, without causing the two adjacent areas to obtain the same number, that is, there are at most four adjacent areas.

After Liu Zhicheng finished writing, he began to explain. Soon, Liu Zhicheng used easy-to-understand principles to explain how he could figure out the four colors guesses clearly, which made many people below understand how the four colors guesses came about.

After the explanation, Liu Zhicheng threw the chalk casually and said to Rajskov: "How is it? Are you convinced? Do you understand now?

Your guess is simply wrong, this is the real solution to your guess.”

When Liu Zhicheng explained just now, Rajiskov also heard it. He also deeply understood that he was wrong, but now is not the time to admit his mistake, because he can't afford to lose that person.

So Rajskov said to Liu Zhicheng: "Although you can solve my guess, I don't admit your answer. Besides, what are you? What qualifications do you have to answer my guess in the international mathematics community! If you have the ability, you will also propose a guess! I will solve it for you in minutes!"

After hearing this, Liu Zhicheng smiled at Rajskov and said, "This is what you said!"
Chapter completed!