What is this?

What the hell is this?

Testify to your brother-in-law.

It’s not just that I have no idea at all.

Not even a train of thought to think about.

All the questions he has done and all the problems he has encountered have nothing to do with this question.

This kind of inexplicable thing should be called "xxxx conjecture", right?

There's no chance of Guijianfeng coming, right?

There may be a chance to resolve the dispute.

Li Zheng couldn't help but glance at Lin Yujing again.

Damn it!

She is writing furiously!

At this moment, Li Zheng panicked.

Could it be... isn't she on the first floor?

But on the fourth or fifth floor?

This is impossible. It took me thousands of hours to reach the third level.

Even genius has a limit.

No matter how scheming Zhu Hongbo is, he would not be so shameless as to make things difficult for high school students by asking a question that is impossible for high school students to think about.

There must be some simple and crude standard solution that I have forgotten...

Because I have been working on the connection between physics and mathematics, I have ignored the basic mathematical methods.

Li Zheng held his breath for only three seconds before a clear routine jumped out——

Mathematical induction!

Look at my memory, it’s been so long that I’ve forgotten it.

However, this question is not a simple induction. It also requires knowledge of integer division and perhaps algebraic transformation.

The only thing that is certain is that the requirements for thinking are far greater than calculations.

Because you cannot calculate the divisibility problem of 2000 prime numbers, let alone forget it, it is impossible to write 2000 prime numbers.

Logic is the most important thing. The logic must be completely smooth before it is possible to solve the problem. A bunch of logical words must be used to connect it, and perhaps contradictions and counter-evidences must be used.

So first of all, we must forget the number 2000.

Obviously, this is just a number made by the person who asked the question, and it is meaningless in itself.

23333 is also acceptable, 666 is also acceptable, write whatever makes you happy.

Being exactly divisible by 2000 different prime numbers is just a smoke bomb.

What actually needs to be proved is that it can be divided by any number of prime numbers that are different from each other.

Humph, that's all.

So, let's get started.

…

After one hour.

Zhu Hongbo finished marking the papers of three classes.

Look at the left first.

Li Zheng kept writing and writing. It was obvious that his mind was still confused and confused.

Look to the right again.

Lin Yujing just stared at the question in a daze.

After she wrote a few lines in the notebook, there was nothing more to say.

Zhu Hongbo smiled.

Are you happy?

Real math?

Are you happy?

Zhu Hongbo stood up with a smile, picked up the thermos cup and said: "It's time to go to the bathroom, it's time to drink water."

No one paid attention to him.

He didn't say anything else, so he went out to get water, wandered around a lot, chatted with Tang Zhifei, and then talked with Tao Feifei.

When the two sides chatted, the words they said were pretty much the same.

"Guess what, Zhifei has already restrained them both."

"Teacher Tao, don't panic. They are still high school students in mathematics. I surrendered to just one question."

"Don't worry, I'm safe here."

"Let them know that they need to be in awe of the subject and the teacher."

"Hey, no, no, no, it's just the natural depth of the math questions."

After pretending to be cool, Zhu Hongbo returned to the door of the teaching and research group with high spirits.

I originally wanted to go in directly.

But if you think about it carefully, it is really rare for these two people to be so anxious.

He then secretly opened a crack in the door and peeked in.

This glimpse is just a glare.

That’s not true!

These two people were not distressed at all.

But they are whispering to each other!

In fact, the conversation had already started as soon as Zhu Hongbo left.

The first was Li Zheng, pretending to talk to himself.

"Lao Zhu asked this question... on purpose..."

"Well..." Lin Yujing sent a response that was not really a response.

After struggling for a moment, Li Zheng pulled up his chair and said, "Do you want to join forces?"

"..." Lin Yujing was also confused for a moment, and then nodded "Huh".

After that, the two got closer and closer until they were together.

The muttering was endless.

"Yes, prove the lemma first, and then prove more general propositions."

"Hmm... I thought about the big idea, the disproof and contradiction in the middle, but I couldn't find a suitable algebraic variation."

"I have this. Look at this identity..."

"!!! Sure enough, he is a scum suitable for making stupid mechanical calculations!!!"

"Mao, I thought of this as soon as I came up. It's the intuition of my mathematical brain."

"Zhazha! Now that this is out, the proof will be super simple later."

"Really...oh? That's right! She is indeed an opportunistic and lazy woman."

"Zhazha! Pinch you!"

"Did I say something wrong? Aren't you opportunistic?"

"..."

"Aren't you lazy?"

"..."

"Aren't you a woman?"

"...Zhazha! I have already proven your ability to tell lies."

"Fuck...wait for me...let's do it together. Let's put aside the differences between us in advance, and we'll be open to the public."

"Well, Zhu Zhu is scared to death."

After the two decided on their strategy, they pulled their chairs back to their original positions before Zhu Hongbo came back.
To be continued...