Hearing Xu Chuan say, 'It's not very difficult', the corners of Zhang Weiping's mouth couldn't help but move.

What if he kind of wants to hit someone?

Although the knowledge used to solve IMO competition problems is basically limited to high school, skills and experience are things that cannot be locked.

In this case, with decades of mathematical knowledge and experience, it would take him more than an hour to solve the problem, which is not difficult?

That's a bit too pretentious.

All right.

For this one, it may not be difficult.

After all, he has solved three of the seven millennial problems by himself, and in today's mathematics world, there may be some people in a single field who are enough to compare with him, or even surpass.

For example, Faltins and Deligne in the field of algebraic geometry; Sarnack in the field of number theory; Perelman in the field of topology and many more.

These top bulls can still compare with this one in their respective fields of expertise, and even lead or surpass.

But looking at the whole, I am afraid that in addition to Tao Zhexuan, who may be able to barely keep up and dabble in so many fields at the same time, it is really difficult to find another mathematician who can be proficient in so many fields of mathematics at the same time.

What's even more perverted is that in addition to the field of mathematics, he has also made considerable achievements in almost completely different fields such as physics, materials, and astronomy.

Honestly, can human talent really be so strong?

It's hard not to wonder if there's a quantum computer hidden beneath this skin.

Standing opposite the two, Xu Chuan didn't think about it that much.

He was still a little surprised when he heard that Liu Jiaying was the only girl in the entire IMO who received a perfect score.

The last big question on the IMO was made by him, and the difficulty was really not too high in his opinion.

If he really wants to say a difficult problem, he is sure that he can do it himself, and no student in the entire IMO competition can solve it.

But there is no point in doing that.

For a mathematics competition, the content of the question is not how much knowledge these students have, but how they can use this knowledge to solve problems in their limited knowledge.

Mastering knowledge is only the foundation, and using knowledge to solve problems is creativity.

But that doesn't mean it's that easy to solve.

He didn't need to use college knowledge to come up with the questions, and what he learned in high school was sufficient.

But the skill required to solve that problem is not low, and it can even be said that it is high.

To be able to solve the problems he came up with, his mathematical talent and hard work are absolutely indispensable.

And this kind of genius appeared in the category of friends around him, Xu Chuan was indeed a little surprised.

But thinking about Liu Jiaxin's talent in mathematics, it's normal.

It's not that genes inherit these things.

In fact, genes are not necessarily 100% effective, and no one can guarantee that an older brother or sister will have an amazing IQ, and a younger brother or sister will also have excellent intelligence.

But if there is an older brother or sister around you who has enough talent on a certain road and can bring experience to your younger siblings, as long as the older brother or sister is willing to teach, it is absolutely unimaginable to ordinary people.

It's like him and Xu Xiao.

In the past, when he was in junior high and high school, during the winter and summer vacations every year, a large part of Xu Xiao's extracurricular tutoring, homework, learning problem-solving ideas and skills and other things were taught by him.

These things have brought Xu Xiao more experience on the road of learning, allowing her to be more relaxed and stand out in middle school at the same level.

This is also the reason why relatively wealthy families are more likely to produce excellent geniuses.

Because their parents, or their family conditions, are able to find a good teacher to do the job.

In relatively poor families, most children are faced with parents who have not completed junior high school or high school, and teachers in the school who have to take care of the whole or even multiple classes.

If you don't have the talent to stand out and receive extra attention and guidance, it's hard and hard to get an 'extra' and detailed instruction.

And sometimes, middle and high school teachers don't necessarily have this ability.

This 'theorem' is not only applicable to learning, but also to many other broad fields.

After all, the most precious thing of a person is not wealth, but status but time.

After looking at Liu Jiaying, Xu Chuan smiled and said, "If you want, you can come to my side."

On the other side, Zhang Weiping raised his eyebrows and interrupted: "I said, isn't it a bit unkind for you kid to do this?" I finally accepted an undergraduate, and you want to poach it. ”

After a pause, he sighed again, and then said: "Forget it, if you really want it, take it away, it is definitely much better to study with you than to follow me." ”

After being interrupted, Xu Chuan also came back to his senses, and after thinking about it, he said:

"Forget it, let her study with Academician Zhang at the university stage, I have a lot of research on hand, and I may not be able to learn anything during college, so it is more important to lay a good foundation."

"If you wait until graduate school or Ph.D., you can let her apply to NTU."

"If you want to."

In the last sentence, he looked at Liu Jiaying and said.

Originally, he wanted to dig up this senior sister's sister directly, but after being interrupted by Academician Zhang Weiping, he dispelled this idea after thinking about his time.

He didn't have much time to guide him at this stage of laying the foundation in college, so instead of digging it up like this, it was better for her to study with Academician Zhang Weiping at the undergraduate level.

When it comes to the master's or doctoral level, he is still willing to accept the student if she wants to.

Of course, the premise of these things is that she is willing.

If Liu Jiaying was unwilling, he would not be able to forcibly ask people over, there was no need for that.

On the other side, Liu Jiaying blinked, and after meeting Xu Chuan's gaze, he looked at his mentor again.

After feeling the encouragement and recognition from those kind eyes, she nodded and said obediently: "Thank you, Academician Xu, I will study hard." ”

The opportunity to learn from the first person in mathematics is a rare opportunity for anyone who is interested in taking the next step in mathematics.

And this person seems to be special to her sister, which makes her curious.

After a pause, after hesitating for a moment, she still spoke: "Academician Xu Xu, can I add you a prestige?" ”

Xu Chuan smiled, took out his mobile phone from his jacket pocket, and sent his mobile phone number after adding prestige.

"This is my phone, if you have any things or study problems, you can send me a message or call me with authority, don't worry about disturbing me, and don't have to be so polite."

After a pause, he looked at Zhang Weiping and said with a smile: "Academician Zhang, I won't disturb your meal, let's go first, and talk again when I have time." ”

Zhang Weiping said with a smile: "Go, I have time to go to Riyue (Fudan) University to sit after returning to China." ”

Xu Chuan waved his hand and turned to leave.

Returning to his room from the restaurant, Xu Chuan took a shower and turned on the computer and connected to the hotel's wireless network.

Unexpectedly met an 'acquaintance' in St. Petersburg, he really didn't expect that he would call his senior sister to come over.

casually clicked on the prestige and found the prestige of Liu Jiaxin, and he sent a message over: "Guess who I met in St. Petersburg?" ”

After sending the message, he realized that there was a time difference of about five hours between St. Petersburg and China, and it should be early in the morning, and the opposite side should have slept.

But just as he was thinking about turning off his prestige and brushing up on the process of this mathematics conference report, the news came back.

"Jiaying?"

Seeing the reply, Xu Chuan raised his eyebrows and typed with a smile: "She told you?" ”

"Well, she just messaged me and said she met you."

Xu Chuan typed with a smile: "Speaking of which, you already knew that your sister would participate in this mathematics conference, right?" Why don't you tell me a word? ”

"She's an adult and can take care of herself."

Xu Chuan: "You treat me as an outsider, it's too polite." Forget it, let's not talk about this, it's already early in the morning in China, why haven't you slept yet? ”

"I'm still on the company's side."

"Why are you still working overtime at this point? Is something wrong? ”

"There are some problems with the algorithm of the artificial intelligence program, and I will solve it as soon as possible."

Looking at the message coming back on the screen, Xu Chuan was stunned for a moment, and typed: "It's not too late to do these tomorrow, go back and rest early, you are also an adult, don't let me worry." ”

The other side was silent for a few seconds, and a message flew over.

"Hmm~."

The next day, early in the morning.

After Xu Chuan woke up from the bed, he opened the heavy blackout curtains.

Before seven o'clock in the morning, it was already bright outside.

Winter in St. Petersburg has a late sunrise and an early sunset, and the daylight hours may be less than six hours.

But for its summer months, it's a different story entirely.

In the middle of summer, in this city, the interval between the setting sun and the rising sun is almost indistinguishable.

Due to its proximity to the North Pole, St. Petersburg is one of the few cities in the world to have 'white nights', with nearly 20 hours of daylight in mid-summer in June, July and July.

Especially on the summer solstice on June 21 every year, the sun even appears to never set.

It had already risen from the east when it had set from the west, but still revealed a faint light.

This 'sun never sets' spectacle attracts a large number of tourists from all over the world every year, but it has to be said that it is indeed a very magical and shocking thing.

If you have the opportunity, you can still see it.

After a brief breakfast in the restaurant, Xu Chuan took the vehicle provided by the Alpha team and went to the outskirts of St. Petersburg with Schultz and Tao Zhexuan to find Perelman, who was a bit of a 'social phobia' and didn't like to deal with people very much.

"Speaking of which, have you seen Perelman before?"

On the black bulletproof car, Xu Chuan looked at Tao Zhexuan and Schultz curiously, not to mention that he had held several math conferences, including a report meeting at the level of the millennial problem, but he really hadn't seen that weirdo.

For the mathematical community, if there is one of the most mysterious mathematicians, it is definitely Perelman, who proved the 'three-dimensional Poincaré conjecture'.

Since solving the millennial puzzle, news of the mathematician has rarely appeared in the mathematical community.

There were many people who wanted to visit him, but so few were lucky enough to meet him, that it was completely unclear what he was studying and how good he was in mathematics.

Schultz shrugged his shoulders and said, "I only met once a long time ago, but I didn't say a few words. ”

If it weren't for that, his previous resentment wouldn't have been so great.

On the side, Tao Zhexuan thought for a moment and replied: "I've met a few times, and I've exchanged some mathematical ideas. ”

Hearing this, Schultz immediately looked at him in surprise: "Huh? How many times have you seen that weirdo? ”

Tao Zhexuan pushed his glasses and said with a smile: "If it was before he proved Poincaré's conjecture, it would not be difficult to meet him. ”

"At that time, although he was also withdrawn, he was also welcome to talk to other mathematicians."

"It's a pity that after proving Poincaré's conjecture, there were too many people who disturbed him, whether it was media reporters or other people, which made him very disgusted, which led to the direct seclusion in the back and no outsiders."

"If it weren't for Xu, I am afraid it would not be so easy."

Xu Chuan smiled and said, "Maybe it's because I'm more handsome?" ”

Schultz, Tao Zhexuan: "."

The two looked at each other silently, Schultz nodded suddenly, and then reached out and took out the wallet from the pocket of his jacket, opened it, and handed the photo of his little daughter to Xu Chuan.

"Do you think my little girl is cute?"

Xu Chuan glanced at it, and the photo showed a five or six-year-old girl with a short hair and a bright smile.

"It's cute, what's wrong?"

Seeing the fish take the bait, Schultz grinned and said, "What I want to say is that the handsome person should be married and have a wife and daughter!" ”

On the side, Tao Zhexuan said with regret: "It's a pity that I didn't bring a photo, otherwise I can let you take a look." ”

Xu Chuan: "."

MMP！

After almost half an hour or so of driving, the bulletproof vehicle arrived on the outskirts of St. Petersburg.

A street dominated by blue-and-white and red-and-white buildings is lined with old houses.

On the stone steps, Perelman lives in seclusion in one of the nearby apartments.

Looking at these villas and apartments that looked almost different, Xu Chuan suddenly remembered something.

He's like. It is unclear exactly where Perelman lives

Although the two of them had contacted each other by email and agreed in advance, the 'weirdo' did not attach to the mailbox how many villas or apartments he lived in, but only said that he lived here.

What's more, he didn't have Perelman's phone either, and it was impossible to make a temporary call to ask the other party for directions.

Scratching his head, Xu Chuan glanced at Schultz and Tao Zhexuan with some embarrassment, and said, "By the way, do you two know where Perelman lives?" ”

Hearing this question, both of them were stunned.

Schultz couldn't help but ask, "Didn't you make an appointment with him?" ”

Xu Chuan: "It is true that I have made an appointment that I will come to visit today, but he doesn't seem to have sent me a specific address in the email, only that he lives on this street, and the specific number is really not." ”

"Give him a call and ask?" Tao Zhexuan said.

Xu Chuan shrugged his shoulders and said, "You have his phone?" ”

There are Perelman phones in the mathematical community, I'm afraid there are no more than one hand, or is Perelman not a mobile phone at all?

At least he didn't have a phone number.

Tao Zhexuan shrugged his shoulders, and neither did he.

"Then find someone to ask, since you live here, there should still be people who have seen you, right?"

Xu Chuan thought about it for a while, took out his phone from his pocket, and Google came out with a few photos of Perelman.

I have to say that this big math parent is indeed a bit 'scribbled', at least judging from the photos found on Google.

Picking out a slightly clearer, not so sloppy photo, Xu Chuan stopped a passerby and exchanged a few words, and then showed him the photo on his phone.

But soon the other party shook his head in confusion, saying that he had never seen it.

After thanking him, he let the passer-by go, and he consulted several different passers-by, but the results were almost unanimous.

No one knows where Perelman lives and says he has never seen him on the street.

Even, most people said they didn't know the person in the photo.

PS: There's one more chapter later

(End of chapter)