Early the next morning, Wang Yinan boarded a flight to Shenzhen, Haiya did not have a direct flight to Hong Kong Island, but Shenzhen and Hong Kong Island are separated by a water, and it is also very convenient to go to Shenzhen first and then go to Hong Kong Island.

Haiya to Shenshi is across the sea, the actual distance is very close, and the plane has just taken off.

In recent years, due to the rise of the Shenzhen market, Hong Kong Island has lost its former status, and five years ago, most mainlanders would make a special trip to Hong Kong Island in order to purchase various luxury goods. When Wang Yinan passed the customs in the morning, he saw that the flow of people was sparse, and there was no longer the grand occasion of the year.

Founded in the sixties of the last century, Hong Kong Island Chinese University is a well-known institution of higher learning in Asia and even the whole of Blue Star. Twenty minutes after crossing the border from Shenzhen via Luohu, Wang Yinan arrived at the Hong Kong Island Chinese University in Shatin.

Don't say it, looking at the endless sea all day, no matter how good the scenery is, it is also a little boring, and inside the Hong Kong Island Chinese University, the scenery is picturesque, full of vitality, modern buildings and classical office buildings are interesting, compared with the pale winter of the imperial capital, Wang Yinan came here, it was like going to heaven.

Chinese University is located by the sea, with a hill behind the school, located in the subtropics, and even in this season, Hong Kong Island is still green. Hong Kong Islanders attach great importance to education, and this is probably the best place with the best scenery within a radius of dozens of kilometers, and if they build a small building, they will definitely make a lot of money, but they are stunned to build a university.

Mr. Yau happened to have a public class in the morning, in the large lecture hall of Shaw College, and when Wang Yinan arrived, the lecture had already come to an end. Since the content of the lecture was about differential geometry, there were too few people who could understand it, so there was no crowd of people in the lectures given by university scholars like Mr. Qiu.

Wang Yinan quietly walked into the lecture hall from the back door, found a seat in the back row and sat down, Mr. Qiu did a general public class today, which roughly means about Calabi-Qiu manifolds, some applications in modern physics string theory, Wang Yinan listened with relish, who could have imagined that a gadget created by mathematicians out of interest a few decades ago, and today, decades later, physicists have found that this gadget can perfectly explain why the space we are in is ten-dimensional. But we can only find three dimensions.

Because seven of these dimensions are curled up at the level of quarks, like the Calabi-Yau manifold, then these huddled dimensions are the main source of weak interactions.

The open class ended quickly, maybe because it was not strange, there were no large numbers of students surrounding after class, only three or two students, walked to the edge of the podium, and asked for something, Wang Yinan thought that if this was in the imperial capital or N University, it was estimated that a large number of fans would go up to sign autographs.

Mr. Qiu is over 60 years old, wearing a pair of classical glasses, his hair is a little gray, but his eyes are very sharp and his voice is very loud. It may be that a student's question tickled him, and Mr. Qiu said loudly, "High-dimensional space requires imagination, if you don't have imagination, don't engage in this industry", while saying, he also danced and gestured.

When a few students left, Wang Yinan stepped forward, bowed to Mr. Qiu first, and then introduced himself and said, "I am Wang Yinan from the imperial capital, and I have a math problem I want to ask", it is rare for Wang Yinan to be so polite, of course, for the real bull, Wang Yinan has always felt very polite, but there are too few bulls, and they generally can't touch it.

Mr. Qiu stretched out his hand and shook hands with Wang Yinan, "You are the genius of physics, Tian called me this morning, saying that you have a very interesting topic, so I must meet you."

Wang Yinan breathed a sigh of relief, it seems that it is right to find an introducer, as long as he is not kicked out, the matter is half the success, Wang Yinan does not believe that a real mathematician can resist the temptation of an interesting topic.

Wang Yinan pointed to the blackboard, "Can you use this?" Mr. Qiu nodded.

Erasing the handwriting on the blackboard, Wang Yinan first drew a simple lattice model, and then began to write and speak,

"When we studied the lattice structure of copper oxides, we proposed a new eigenproperty, which we called lattice frequency",

"Simple lattice frequencies, such as copper oxide, can be represented by two space groups, and if the topological manifold analysis of this space group is carried out", Wang Yinan wrote down a complex mathematical formula.

"You can get such a mathematical formula, and then calculate the lattice frequency, which is in good agreement with the experimental data."

"If we add a new atom to the middle of copper oxide, such as calcium, we can add the concept of color to one of the space groups, so that the equation in the middle will become like this", Wang Yinan wrote a more complex equation,

"This equation is very interesting, it looks a little similar to the equation of quantum chromodynamics, and it seems that it can only be solved by perturbation", Mr. Qiu couldn't help but speak.

The big bull is the big bull, at that time we tried for several days, and finally decided to use the perturbation solution, Wang Yinan sincerely admired, "Yes, we applied the perturbation method through the unfolding part of the equation, and finally obtained the following formula",

Wang Yinan wrote a slightly simpler formula on the blackboard,

"Very perfect derivation", Mr. Qiu watched Wang Yinan finish writing and asked, "You have all done a beautiful job so far, is there any problem?"

"When we add a third color in the middle of the color space group, the problem arises, the part that expands in the middle of the equation becomes non-convergent, and once the perturbation is applied, a large amount of infinity will appear," Wang Yinan wrote on the blackboard the equation for adding another color.

"Interesting", Mr. Qiu took the chalk from Wang Yinan's hand and began to write and scratch on the blackboard.

"The color space group of three colors is also related to the first colorless space group, and what is more interesting is that you have to do a differential analysis of this topology in order to obtain the eigenfrequency of the group," Mr. Qiu wrote.

"This series can be expanded, but the result after expansion, it seems that so far, I have not seen it in the middle of any literature",

"Wait, this part is a little familiar, it seems a bit like Hamilton's work back then",

"This is a Richard manifold, uh, no, it's some variation of a Richard manifold, the shape is broken, and you can't simply think of topological equivalence...

Well, I understand every word you say, how to put it together, the amount of information is a bit too much, Wang Yinan thinks that sometimes, brain overclocking is not necessarily good.

Unconsciously, half an hour passed, and Mr. Qiu's assistant on the side had urged him several times, perhaps because he had been standing for too long and was a little tired, Mr. Qiu threw the chalk away,

"Let's go to my office," then turned to the assistant and said, "Order two lunches to be delivered to my office."

Wang Yinan took out his mobile phone to take pictures of all the formulas and calculation processes on the blackboard, and then wiped the blackboard clean.

Mr. Qiu's office is in the small building of the School of Science opposite the lecture hall, the room is very large, Wang Yinan walked in, and noticed a huge blackboard, a huge table, and a row of oversized bookshelves, it seems that Mr. Qiu likes big things, "But this kind of office is very good, go back and decorate one for yourself", Wang Yinan thought.

For a whole afternoon, Wang Yinan and Mr. Qiu have been discussing these damn space groups, maybe because of the charging in Haiya a few days ago, Wang Yinan is in surprisingly good condition, and he can actually keep up with Mr. Qiu's rhythm, and when he encounters some unseen citations, Wang Yinan can quickly understand the key to the problem.

Dinner was still sent by the assistant, the scientist worked, it could not be interrupted casually, Meimei took a sip of soup, Mr. Qiu asked curiously, "You physics students, are you all so good at mathematics", "Where, my mathematics, at most is average", Wang Yinan remembered the F4 in the university dormitory, the perverted ancient man, "I have a classmate who is really good at mathematics", Mr. Qiu obviously didn't believe it, "Really, I really want to see and learn if I have the opportunity, and accept an apprentice."

Time passed quietly in discussions and attempts, after all, it was more than 60 people, and at ten o'clock in the evening, Mr. Qiu, who was already a little exhausted, was forced home by his assistant to rest, and Wang Yinan found a hotel to live in at the school gate.

Early the next morning, Wang Yinan continued to go to Mr. Qiu's office to work, and Mr. Qiu also postponed several meetings, and the math problem in front of him had attracted all his attention.

Three days later, in the afternoon, Mr. Qiu threw the chalk, and on the blackboard was a complex mathematical equation, but there was a part in the middle without symbols, just a square.

"As long as you find the expression in the middle, the problem is solved," says Mr. Qiu.

"Well, the other parts of the reasoning and argumentation are very sufficient, but according to the existing assumptions, we only know the conditions that must be met in this part, and the specific form is difficult to deduce," Wang Yinan said.

"I'm old, ten years younger, and I have to get this thing out without sleeping", Mr. Qiu sighed regretfully,

Wang Yinan, who was less than thirty years old, laughed awkwardly, "This, are you always scolding me, or scolding me... ”，

"I didn't say you, you are not a professional mathematician, this part involves the analysis of at least five or more topological manifolds, which requires not only mathematical ability, but also a thorough understanding of all the current advances in the field, as well as strong abstraction ability and spatial imagination," said Mr. Qiu.

"Uh, does such a person really exist on the Blue Star?"

"Of course it exists, and I happen to know one," Mr. Qiu said.

"I'm too old to run, I think, it's time for you to go to the rice country."

"Could it be him, the smartest man on the Blue Star?" Wang Yinan also reacted,

"The guy who won the gold medal in the Mathematical Olympiad before he was thirteen years old",

"That youkai who is said to have an IQ of 230?" , Wang Yinan secretly complained, "Brother IQ is more than 160, people think I'm a monster, 230 IQ, is that still a person" (IQ IQ, is it an intelligence test score, normal people range from 80 to 120, 120 or more can be called smart, generally when I was a child, the score of the first test is more accurate, and multiple tests can cultivate test skills and improve scores, so it doesn't make much sense).