Lu Zhou's harvest in the past few days can be said to be quite large.

Not only at the academic level, but also in the sense of contacts in the academic community.

It was still a strange feeling that many people he had only seen in newspapers, news, and even textbooks before stood in front of him.

For example, Heimbrezzi is an academician of the French Academy of Sciences and a foreign member of the American and Chinese Academy of Sciences. The functional analysis that Lu Zhou read was a work compiled by him. The description and explanation of Sobolev's space impressed Lu Zhou deeply.

This old gentleman from France spoke very funny and enthusiastic, especially when he heard that Lu Zhou had read his works, he was even more enthusiastic about Lu Zhou, and repeatedly said that if he had the opportunity to come to France, he could go to Paris to find him.

He has a very interesting collection of books, including even Euler's manuscripts.

In addition to this enthusiastic and cheerful French old man, Lu Zhou also met Tao Zhexuan, a well-known genius in the Chinese mathematical community.

is not the same as the impression, this math genius who often "points out" on the blog is unexpectedly a shy and laughing person in reality.

In addition, he looks younger than Lu Zhou imagined, and he can't tell at all that this person is actually a post-seventy-five generation, and he is already forty this year.

Because he was born in Australia, he can't speak Mandarin, although he can speak Cantonese, but it is very uncomfortable that Lu Zhou can't understand it, and the two can only communicate in English regrettably.

On the fourth day of the conference, after the one-hour presentation, Tao Zhexuan invited Lu Zhou to visit his office.

At first, the two just chatted about domestic and foreign affairs, and soon the topic turned to academic issues.

After exchanging a few words, Lu Zhou couldn't help but sigh in his heart.

I have to admit that in the field of mathematics, this guy is indeed a genius! His field of study is all over the field of mathematics, and there are many things that he is not necessarily good at, but you will be hard-pressed to find something that he does not know.

And just this September, he cracked the 80-year-old Eldsh discrepancy problem. In the field of number theory and discrete analytical mathematics, this is a very classic problem, and it is outside his field of study.

It's just that because it is not as important as Polignac's conjecture, the limelight is overshadowed by Lu Zhou, a rising star.

"Are you working on the Goldbach conjecture?"

Lu Zhou asked unexpectedly, "Yes, you have also studied it?" ”

"I tried, just at the beginning of this year, but I soon found out that it was not something I could solve, and I was still better at the study of partial differential equations and harmonic analysis," Tao Zhexuan smiled embarrassedly, and generously admitted his shortcomings, and continued, "At that time, I read your paper in the Annals of Mathematics, and I got a lot of inspiration from the supplement of the topological principles of sieve theory, and I thought that if I improved it, maybe I could prove this problem of the century on the basis of Chen's theorem...... The results are regrettable. ”

"Is the sieve method still impossible?" Lu Zhou frowned and asked.

The sieve theory supplemented by topology was originally one of his alternatives, and Tao Zhexuan's statement was undoubtedly bad news for him.

"It doesn't work...... Or maybe I didn't make it," Tao Zhexuan shook his head, picked up a ballpoint pen and wrote a few lines of equations on the paper.

sam2an2, where an takes any number

saanean，，nz，a1…… An is a set of real numbers with a modulo 1 good distribution......

……

Staring at the equation on the paper, Lu Zhou touched his chin, his brows furrowed, and he fell into deep thought.

Tao Zhexuan stopped his pen, smiled and said, "I can be regarded as a class axe, and this method was invented by you." ”

"No, it was Professor Zelberg who introduced the theory of topology into the big sieve method, and I only did a little work on his basis, and you obviously made a lot of improvements." Lu Zhou smiled, continued to look at the expressions on the paper, and said thoughtfully, "Since AM is a good distribution, why don't you think of R1SAM2 as the Riemann sum of SA2DA?" ”

Tao Zhexuan's eyes lit up slightly: "And then?" ”

"Take the value r1, we can get the ...... from the Kirsischwarz inequality" said that it was unclear, Lu Zhou picked up the pen and wrote his thoughts on the paper.

sa12nan2

Tao Zhexuan's eyebrows furrowed slightly, and he said thoughtfully, "Your idea is very interesting...... We need to look for an nδ value, and we can find it. ”

Lu Zhou touched his chin and nodded: "Yes, it won't be much bigger than nδ1, but the trouble is n." ”

The silence lasted for a moment, and the two of them looked up at the same time and smiled at each other.

The smile is invariably a little bitter.

Sure enough, it still doesn't work!

Throwing the ballpoint pen on the table, Tao Zhexuan sighed and sighed.

"Goldbach's conjecture is really too difficult, maybe another 10, or even 20 years. Maybe you can try the circle method, to be honest, the road of large sieving may really not work. ”

Lu Zhou shook his head: "I'll take the time to study it, but I'm not completely dead set on sifting, maybe there is still potential that we haven't discovered." ”

"Why don't you come to Berkeley to teach, the environment here is not bad, we can work on this topic together...... If you don't think I'm stupid. Tao Zhexuan smiled shyly.

Lu Zhou: "......"

Yes, the IQ of 230 thinks that you are too stupid, what do you do with ordinary people who let the IQ fluctuate around 100?

It was the first time he realized that talking to someone who was too modest was a headache.

Lu Zhou coughed lightly and said, "I haven't graduated with a Ph.D. yet, and I'll probably go to Princeton for a Ph.D. at the beginning of next year." ”

"You haven't graduated yet," Tao Zhexuan glanced at Lu Zhou in surprise, "Okay...... The universities in China are really strict. ”

Lu Zhou: "I only got a master's degree at the beginning of this year. ”

"Oh, that's understandable," Tao Zhexuan smiled understandingly, "When I was a master's student, I was also able to graduate in half a year, and my tutor had to keep me for a year before releasing me." ”

Saying that, Tao Zhexuan wrote down his email address on the previous scratch paper, handed it to Lu Zhou, and said with a smile: "Contact me by email in the future, if there is anything new, I will communicate with you again." ”

"Okay."

Lu Zhou smiled and nodded, put away the scratch paper, left his email address on another piece of paper, and said goodbye to Tao Zhexuan.

When walking in the direction of the hotel, Lu Zhoulu had been thinking about the question just now, and he couldn't figure it out.

Thinking about it, my stomach became hungry.

He took out his phone and looked at the time, and when he saw that there was still a moment before the meal began, he turned around and walked into a rib shop on the street.

After ordering a rib set, Lu Zhou took out $19 in change and put it on the counter, then found a place to sit down.

It is said that the price of meat in the United States is cheap, but he always feels that it is not much cheaper.

A rib is $19, and if converted to RMB, it will cost 110 or more.

Just as he was thinking this, a somewhat thin waiter, carrying a plate as wide as a basin, placed it on his desk with a slight difficulty.

Seeing the contents of this plate, Lu Zhou's eyebrows twitched fiercely.

Good guy, he thought the ribs here were the kind of ribs he had seen in a western restaurant, but he didn't expect that there was a whole rib on the plate! If you stew soup, it's enough to stew several large pots!

Add a pound of baked potatoes sprinkled with butter and sour cream, and a bowl of Mexican stewed red beans and presumably a mystical soup with cream......

Looking at it this way, the price of this meat is indeed quite cheap.

However, this is obviously not a portion that one person can eat......

He finally knows why there are so many fat people in the United States.

"Sir, are you satisfied with the food?"

Hearing someone ask, Lu Zhou suddenly remembered that he didn't seem to have given a tip yet, so he took out two dollars of change from his handbag.

But at this moment, he suddenly found that the waiter ......

Sound familiar?

Lu Zhou handed the tip to her and asked suspiciously, "You work here?" ”

"Hmm." Vera nodded embarrassedly.

"No scholarships?"

Lu Zhou used to work part-time for tuition and living expenses, so he didn't think there was anything wrong with it.

But to his surprise, he remembered that the scholarship in the United States was very easy to apply, not to mention this kind of IMO gold medal escort player, as long as the hobbies are not too extensive, it is not difficult to finish college without spending a penny.

Vera obviously didn't expect to meet Lu Zhou here, smiled embarrassedly, and whispered, "There is a scholarship ......"

If it is to save money for travel, or to experience life as a part-time worker, I will definitely say it generously.

Seeing that she didn't continue, Lu Zhou could probably guess that it was mostly for similar reasons as he had at the beginning, so he diverted from this heavy topic.

"Are you Russian?"

Vera's expression was a little subtle, and she shook her head.

Seeing her slightly embarrassed expression, Lu Zhou always felt ......

Do you seem to have asked a question that you shouldn't have asked?

Just then, someone in the back kitchen shouted her name.

When Vera heard her name, she quickly turned her head and answered, bowed quietly and said sorry to Lu Zhou, and ran back in a hurry.