God-level Xueba system upgrades 999 seconds

"It's probably that person who wants to impress the public." Thinking of this, Deligne shook his head and was about to put down the tablet.

But in the next second, his wrist froze, and a name appeared in the corner of his eyes, mr: qin.

He had just met this name not long ago, and the other party proved Zhou's conjecture and twin prime number theory one after another!

"Interesting boy." Deligne smiled, pulled himself together and began to slide the tablet.

However, in the next second, Deligne was stunned.

What did he see?
4 maps of different shapes, they are labeled sequentially, ABCD.

Below the graph is the reasonable inference made by Qin Luo,
"1. If D cannot be adjacent to ABC at the same time, the color number will not increase. If D cannot be adjacent to C, DC will use the same color..."

"2. If D is adjacent to ABC at the same time, on the plane, then D must be in the center or periphery of the adjacent graph of ABC..."

"Sieve method!" Deligne smiled faintly with the corners of his mouth raised.

As a senior professor of mathematics at Princeton University, he saw the method Qin Luo used with just one glance.

However, there are many people who use the sieve method to prove the four-color conjecture, but none of them succeed.

Deligne smiled and shook his head: "Another stubborn young man."

"What?" Hearing Deligne's words, Henrik beside him came over.

"There is a Chinese boy who wants to use the sieve method to prove the four-color conjecture." Deligne said with a smile.

Sieve?

Henrik smiled and said, "Another young man who doesn't know the heights of the sky and the earth."

"By the way, who is he?"

"Qin Luo."

Qin Luo?

Hearing Qin Luo's name, Henrik froze for a moment, doubts flashed across his brows, and he muttered, "It's a very familiar name."

"It's the young man who proved Zhou's conjecture and twin prime numbers."

"It turned out to be him!" Henryk suddenly realized, and then a gleam flashed in his eyes.

"Then I'll have to take a closer look."

Speaking of Henrik's head moved up.

At this moment, their eyes widened, and they couldn't move their eyes for a long time.

"omg, how is this possible?" Henrik couldn't help but let out an exclamation.

what's the situation?
Hearing Henrik's voice, the blond and blue-eyed Faljens came to inquire.

"what happened?"

"Faljens, you came at a good time. Take a look at this paper. Someone used the sieve method to demonstrate the four-color conjecture." Henrik waved at Faljens and said loudly.

"A proof of the four-color conjecture?" Faljens raised his eyebrows, and a bright light flashed in his eyes.

He wanted to see what was so special about the thesis that surprised Henrik.

Faljens read it very seriously, he carefully pondered almost every word and every sentence.

After a few minutes, the surprise on Faljens' face became more intense. It was the first time he had seen someone use the sieve method so proficiently.

"When D is in the adjacent center of A, B, and c, then d is surrounded by a, b, and c, and the area of ​​​​D increases significantly, so we can rule out other answers... From this point of view, the understanding of the four-color theorem should be "3+ 1" color, this 1 represents a reusable color, that is, in the four colors, when expanding outwards, there is a color that can be used again, that is the "1" color."

"According to the above inference, the four-color theory is established."

"Clap!"

The tablet fell to the ground, and the screen instantly shattered into pieces.