Vol 2 Chapter 348: Sieve

If it is proved, then everything is easy to say, but if it can't be proved, then Qin Luo's reputation will be completely cold, and even a high-level infamy will be on the back.
So lofty? Seeking a dead end?
Hearing what Ye Father said, Ye Liang nodded in agreement.
This guy Qin Luo is doing it himself.
Qin Luo didn't hear the ridicule of Ye family father and son, but even if he heard it, Qin Luo would only smile.
As a schoolmaster with a system, he really couldn't see Ye family father and son in his eyes.
Even after Ye Liang made a wonderful report on topological functions, the same was true.
Qin Luo writes very slowly, writing every word and word carefully, but as time goes by, there are more and more calculations on the whiteboard.
"1. If D cannot be adjacent to ABC at the same time, the number of colors does not increase, if D cannot be adjacent to C, then DC uses one color..."
"2. If D is adjacent to ABC at the same time, on the plane, then D must be in the center or the periphery of the adjacent graph of ABC..."
"3..."
Five minutes, ten minutes, half an hour...
As time passed, the slowly noisy discussion disappeared, the slowly hearty voice disappeared, and in the end there was no breathing even, and the whole lecture hall fell into dead silence.
"Did you bring paper and pen?" When Qin Luo's formula occupies more than half of the whiteboard, Wang Xuecai turned to look at the assistant teacher behind him.
The teaching assistant is a graduate student, about twenty-four or five years old. After he heard Wang Xuecai's words, he always took out the paper and pen with the briefcase and handed it to Wang Xuecai.
"Give me a copy too." Song Baoguo said suddenly.
"And me." Zhou Haizhong was not to be outdone in the next second.
The assistant twitched his mouth and silently emptied his briefcase.
"Thank you."
Wang Xuecai smiled and nodded, took the pen and paper and placed it on his knees, his eyes gradually becoming more serious.
But after a while, his brows gradually frowned.
As one of the leading figures in China's mathematics world, he can be counted as one of the farthest people in China's mathematics world. He sees problems more clearly than others.
The method used by Qin Luo is slightly different from the conventional method. He uses the sieve method!
Screen out all the impossible, and the rest is the answer!
But countless examples have proved that the four-color conjecture may not be suitable for sieve argumentation.
What does he want to do? The wrinkles between Wang Xuecai's eyebrows became deeper and deeper, and he unscrewed the cap of the pen and began to check the calculation on the notebook.
The Ye family father and son sitting in the corner on the other side didn't have the slightest worry on their faces, but smiled.
Like Wang Xuecai, they are also leaders in the field of mathematics. Among them, Ye Liang is a professor of mathematics at Johns Hopkins University, which shows his extraordinary ability.
Therefore, Wang Xuecai could understand Qin Luo's argument, and he could also understand it.
Seeing Qin Luo's argumentation process that filled the whiteboard, Ye Liang's mouth twitched.
"Sieving!"
What does he want to do?
Not only is he thinking about this issue, but Ye Kang is also thinking about it.
The sieve method is a common method of argumentation in the process of mathematical argumentation.
But this kind of mathematical argumentation method is only suitable for some specific conjectures.
However, the four-color conjecture is not included here.
The reason is also very simple. There are too many possibilities for the four-color conjecture.