Just when Lu Zhou looked at the Indian brother, the Indian brother obviously noticed him as well.

When Lu Zhou approached, he immediately greeted him in curry-flavored English with a smile on his face.

"Hey, buddy, you have a good eye, and you're also in the direction of number theory?"

"Sort of. It's ...... Shocked by the research results," barely understood what he was talking about, Lu Zhou glanced at the poster, looked around again, and found that there was no one around who was interested in this place, so he couldn't help asking, "But why is there no one here?" ”

"Because of the pride and prejudice of the 'Princetonians,' they could not accept that a native Indian had defeated them mathematically, and even refused to allow me to give a presentation on the stage for no reason. It seems that my friends on the same side of the ocean can better understand my feelings," the slightly dark-skinned Indian brother grinned and stretched out his hand, "Dijang, a master's student at Nehru University, your name?" ”

Lu Zhou actually wanted to say that I don't really understand your feelings, because my research results will be exhibited in the form of a report on the fifth day, but after thinking about it, in order not to irritate this foreign friend, I still held this sentence in my heart.

"Lu Zhou, Jinling University," without mentioning his degree, Lu Zhou stretched out his hand and shook it with him, and then couldn't wait to ask, "Can I read your thesis?" ”

"The paper is here, but I recommend you look at it," he patted a stack of papers on his hand, and Dijean tossed it aside, then took out a large whiteboard and wrote and drew on it with a marker, "It's a bit of a hassle, but the principle is simple, you just need to listen to me explain it once, and you'll soon understand the mystery of backward mathematics." ”

"Backward math?" Looking at this Indian brother in surprise, Lu Zhou couldn't help but complain, "You proved it by backward mathematics?" I thought you were studying algebraic number theory. ”

"Algebra is just a tool for studying number theory, not the only way...... I know this may sound a little uncomfortable to you, after all, your Mr. Zhang made a good start in proving the bounded distance of twin prime numbers by algebraic methods, and the proof method I came up with will mean that he not only walked into a dead end himself, but also walked into the grave with a group of mathematicians. ”

Lu Zhou said speechlessly: "...... I don't have any upset, can you get to the point quickly? ”

Dirang hung up the blackboard and turned back to Lu Zhou and raised an eyebrow proudly.

"Right away!"

Just as the Indian brother was writing and drawing on the whiteboard, Lu Zhou noticed that many people were looking at this side with great interest and approaching this side.

With curiosity, Lu Zhou, who was standing next to the poster, followed the Indian brother's proof of thought.

In fact, in the abstract, his thinking is very simple.

First, it is assumed that the twin primes are finite pairs, and the largest twin prime pair is (Pn-1,Pn). It can be seen that the prime numbers within Pn are finite, let them be P1, P2... Pn-1、Pn。

Then construct a large prime number P=(P1P2P3*...*Pn)+1

Obviously, P is not divisible by all prime numbers from P1 to Pn, and there is always 1 left, so P is a prime number. In the same way, P-2=(P1P2P3*...*Pn)-1 is obviously also prime, divided by any prime number from P1 to Pn by a difference of 1.

Since P is a prime number, and P-2 is also a prime number, the two form a pair of twin primes.

The problem is that the twin prime pairs formed by P and P-2 are larger than the "maximum prime pair" originally set, thus negating (Pn,Pn-1) as the largest twin prime pair.

It's like climbing a ladder, no matter how big (Pn-1,Pn) is, you can always find a greater pair of prime numbers than (Pn-1,Pn).

Thus overturning the assumption that "twin prime pairs are finite", and conversely, "twin prime pairs infinite" is true.

There's a lot more in between, but that's the overall idea.

Lu Zhou saw the process he listed on the blackboard from beginning to end.

Surprisingly, he did not cite any of the existing research to address the problem.

This kind of thinking outside the box to find answers is worth advocating.

But......

Lu Zhou finally understood why no one paid attention to him.

"The large prime number P you construct is indeed guaranteed not to be divisible by a series of prime numbers from P1 to Pn, but only if Pn is the largest prime number. Obviously, you have fallen into a logical trap, how do you prove that Pn is the largest known prime? ”

Di Rang raised his eyebrows: "Didn't you see what I wrote in the first line?" In the case of finite twin prime pairs, the largest twin prime pair (Pn-1, Pn) is taken......"

Lu Zhou: "2*3*5*7*11*13+1=30031." ”

When Lu Zhou read out this line of calculations, many of the onlookers next to him had a hint of surprise on their faces, and some people had obviously guessed it a long time ago, and they couldn't help but laugh quietly at this moment.

There are also people who ......

Whispered applause.

Dirang was stunned, feeling that something was wrong, and asked with a frown, "What do you mean?" ”

Lu Zhou sighed: "30031 can be disassembled into the product of two prime numbers, 59 and 509, so this number is a composite number...... Did you come to Princeton at your own expense? If I were your professor, I wouldn't have helped you get funding. ”

Someone next to him whistled.

"Alright, please shut up."

Realizing that he had made a low-level mistake, Dijan's face turned red and turned the color of pork liver, and he swore and ripped off the poster and stuffed the contents on the table into his backpack. Someone next to him whistled at him, but he ignored it and slipped away without looking back.

Lu Zhou shrugged his shoulders a little helplessly.

In fact, he also wanted to tell the Indian brother that from the perspective of mathematical logic, why can't (Pn-1, Pn) be the largest prime pair, but the Indian brother obviously doesn't intend to give him a chance to give directions, so he can only give up.

There was no bustle to see, and the crowd quickly dispersed.

Only one man remained, smiling at him.

Looking at this, Lu Zhou found that it was a little familiar.

He didn't even change his clothes, it was the blonde lady who took him to the hotel yesterday.

Seeing Lu Zhou looking at her side, Mo Lina raised her eyebrows and said with a smile: "Killed a contestant on the first day?" ”

Lu Zhou spread his hands helplessly: "I'm just pointing out his mistakes, is there anything wrong with doing this?" ”

"No, things like this happen all the time," Molina curled the corners of her mouth, "this is 'arrogant' Princeton, and it takes not only a quick brain to present your research here, but also a heart that is strong enough to bear it." ”

Clearly, she heard the conversation between the two of them from beginning to end.

It's really a bad taste......

Lu Zhou didn't even notice when she was standing here.

Seeing that Lu Zhou didn't speak, Mo Lina continued to ask, "You came up with the calculation formula on the spot?" Or prepare in advance and come over to snipe him? ”

"Whatever you think, it should be easy for a genius at Princeton, right?"

Lu Zhou is bored to this extent, and he doesn't study mathematics to find fault everywhere.

Molina raised her eyebrows slightly: "You may have some misunderstanding of the word genius, the human brain is more powerful than computers in logical thinking and creativity, not in the operation of floating point numbers." If there was a person in his research group who knew a little bit about computers and helped him find possible counterexamples, he would not have traveled all the way to make a joke here. ”

Lu Zhou: "But there is no if, right?" ”

"Yes." Molina pursed her lips and smiled, and out of nowhere she found a piece of chewing gum, "Do you want a slice?" ”

After hesitating, Lu Zhou reached out and pulled out a piece.

"Thank you......"

Although he was told not to accept food from strangers when he was a child, it should be okay here, right?

Seeing Lu Zhou accept the gum, Molina pursed her lips and smiled.

"You're welcome, since you accepted my small gift, then in exchange, I want you to give me your email address and FB account."

"The email address can be given to you, I don't have a FB account...... Speaking of which, is this a custom in any country? ”

Halfway through speaking, Lu Zhou suddenly had a feeling that he had been tricked.

Molina smiled and said in a joking tone, "No, it's gentlemanly manners. ”