"Changai?"

Qin Ke noticed a thin young man with yellow skin and black hair standing at the entrance of the subway. It was Wang Changai, his IMO teammate back then who also won the IMO gold medal.

Wang Changai graduated from the School of Mathematics at Yanda University early last year. He originally wanted to go to Princeton University for graduate school, but because he is not good at speaking and has a stutter, he may not be able to pass the interview at Princeton University even if he has a letter of recommendation, so Qin Ke contacted him.

Professor Tao Zhexuan of the University of California, Los Angeles, recommended Wang Changai to study with him.

After examining Wang Changai's talent and level, Professor Tao readily accepted this student.

Since enrolling in school last September, Wang Changai has been busy studying and has not even returned to China during the Spring Festival. However, he still maintains email contact with Qin Ke and other acquaintances.

Qin Ke didn't expect that he suddenly came to Sweden. Could it be that he came with Professor Tao?

Qin Ke was about to say hello, but thinking that he had changed his appearance now, he stopped talking.

Seeing Wang Changai standing there holding two large suitcases with both hands, as if waiting for someone, Qin Ke looked around again, and sure enough he saw Professor Tao just a dozen steps away, surrounded by a group of young students who seemed to be fans.

, feeling helpless and confused, he took out his pen and wrote something on the notebook handed to him by the students, probably a signature.

Most of the time he was recognized by local college students as soon as he left the subway station and asked for his autograph. As expected of a mathematics master who is known as the idol of young students, Professor Tao is really popular.

Although I don’t know why Professor Tao and Wang Changai didn’t take a taxi, but took the subway to come near the venue, but in order to avoid being recognized by acquaintances, Qin Ke and Ning Qingyun quietly exchanged glances, did not go over to join in the fun, and immediately walked quickly

Leave.

After walking for more than ten steps, I heard a student behind me ask in English: "Professor Tao, may I ask, do you think the depth or breadth of knowledge is more important?"

Professor Tao replied sincerely: "When I was a graduate student, I was particularly interested in some theories of mathematical analysis and spent a lot of time on them, because these theories had nothing to do with the research I was doing at the time.

I was also told a few words by my tutor about the relevance of

All the core theories of the subject are worth spending time to learn and study, but you don’t have to limit yourself to these core theories. If you are interested, you might as well get in touch with some additional knowledge. The depth of knowledge improves your ability, and the breadth of knowledge improves your thinking.”

Qin Ke nodded secretly after hearing this. If you want to learn mathematics well, interest is the biggest motivation. If you study for the sake of learning, it is difficult to learn well. Professor Tao can achieve dazzling results in most mathematics fields. In addition to being a super mathematical genius,

Maintaining strong curiosity and strong interest in mathematics is also one of the important reasons.

Qin Ke praised his good friend, but then heard Professor Tao say: "My good friend Professor Qin Ke and his wife Professor Ning Qingjun have done a very good job in this regard. When they were undergraduate students

, spent two years getting in touch with all the subjects they were interested in, instead of limiting their time to professional areas, so they have achieved excellent results in several subjects over the years."

Qin Ke thought that Professor Tao had recognized him and said this deliberately, so he quietly turned around, only to find that he was not looking this way at all.

Professor Tao handed the signed book back to the students and continued: "It doesn't mean much for you to ask me to sign. The best mathematicians in the world should be Qin Ke and Ning Qingyun of Xia State.

They will come to Sweden in the next two days, and you can ask them to sign autographs..."

Qin Ke almost stumbled. Okay, Professor Tao, you, a guy with thick eyebrows and big eyes, actually brought "disaster" to yourself and Ning Qingyun in the blink of an eye?

Another female student said with hope: "I am the president of the student union of Lund University. We are not qualified to attend the lectures of Professor Qin Ke and Professor Ning Qingjun, and we cannot enter the venue. I wonder if Professor Tao can invite them."

They came to our Lund University to give a lecture? We applied to the school, and the school also sent an invitation letter, but Professor Qin and Professor Ning replied that they were too busy with work and declined, which we have always regretted."

Professor Tao was quite happy: "Okay, I'll give it a try."

Qin Ke was afraid of being recognized by Professor Tao and Wang Changai, so he didn't listen any more. He pulled Ning Qingyun and ran away. Jiang Chao and Jiang Qi naturally followed quickly behind them.

Qin Ke complained as he entered the subway: "This old Tao is so unkind. We must be on guard against him selling us next time."

Ning Qingjun just pursed her lips and chuckled, but Jiang Qi asked aloud: "Is that the famous Professor Tao Zhexuan just now? He looks familiar. His photo is hanging in the corridor of Xiangjiang University." She said.

Then he smiled and said: "Of course, there are still photos of you two on the wall. Like Professor Tao, you two are the idols of countless students at Xiangjiang University."

Qin Keqi asked: "You are not really students of Xiangjiang University, are you?"

Jiang Chao nodded and said: "Yes, if you are a fake student at Xiangjiang University, there are many family members of important people in Xiangjiang University who need to be protected. Jiang Qi and I have stayed at Xiangjiang University for eight years for this purpose, and we have learned

Cantonese. We originally practiced Wing Chun from the Ruan Keshan lineage. Later, because we stayed in Xiangjiang for a long time, in order to better integrate into the local environment, we became Wing Chun disciples from the Ip Man lineage..."

Qin Ke: "..."

Well, it’s really not easy to practice, and even the discipline has changed. Qin Ke doesn’t know which branch of Wing Chun he practices, but it seems that he is from the same discipline as Jiang Chao and Jiang Qi?

Jiang Chao and Jiang Qi are a bit chatty and don't really look like bodyguards, but they are indeed good playmates. With them, they don't have to worry about being lonely.

Qin Ke guessed that this kind of bodyguard who didn't look like a bodyguard would make people less suspicious of his and Ning Qingyun's disguised identities.

This chapter is not over yet, please click on the next page to continue reading! A group of four people took the subway and came to the Nordic Museum.

The Nordic Museum is a museum on Zoo Island in Stockholm. It was founded in 1873. It mainly displays the history, culture and folk customs of Northern Europe. It is one of the largest cultural and historical museums in Northern Europe. Its collections include clothing, jewelry, furniture, paintings, sculptures, and household items.

Utensils, musical instruments, ships, etc., one of the most famous exhibits is the crown and scepter of King Gustav Vasa of Sweden.

After disguising themselves and assuming new identities, Qin Ke and Ning Qingyun had no worries about playing together. The only pity was that the photos taken were not their true faces. But it doesn't matter, sometimes you don't have to take a group photo to record the past.

It’s also good to record your footprints carefully.

The two of them and Jiang Chao seemed to be two couples traveling together. In addition, there were quite a lot of tourists from Xia Kingdom, so they blended in without being conspicuous in the crowd. Occasionally, they heard familiar Chinese words, and some tourists would come over to chat.

call.

Qin Ke recognized two familiar Japanese mathematicians among the tourists. With his superhuman memory, Qin Ke could also recall the names of these two people. One was Toda Yukinobu, a Kavli mathematician affiliated with the University of Tokyo.

A professor at the Institute of IoT and Universe, he is good at algebraic geometry. The other one is also a mathematics professor at the University of Tokyo, named Hiroshi Iriya, who is extremely famous in algebraic geometry, symplectic geometry, and mathematical physics.

These two people gave a 45-minute report at the last International Congress of Mathematicians, and they were considered to have competed on the same stage with Ning Qingyun.

The two of them chatted in Japanese while visiting.

Because Yukinobu Toda and Hiroshi Iriya happened to be walking in front of them, and their speaking voices were not deliberately lowered, allowing Qin Ke and others to hear what they said.

Qin Ke's Japanese level is relatively average, and he can barely say hello and ask for directions. However, Ning Qingyun's Japanese level is not bad. He whispered: "They are also here to listen to your lecture. It is said that Mochizuki from Kyoto University

Professor Shinichi is also here..."

Mochizuki Shinichi?

This is a well-known "weird". His academic achievements are famous for being "cool and crazy". He also claims to have proved several famous conjectures including the ABC conjecture through his original "interuniverse Teichmuller theory".

It also defines many mysterious terms that are unheard of in the mathematical community, including the so-called "alien arithmetic holomorphic structure."

Just because these theories are too mysterious, not many mathematicians are willing to spend several years to figure out their self-defined terminology, the context of reasoning and the structure of the theory, as well as whether this "interuniversal Teichmuller theory" is correct, so to this day, international mathematics

No one in the world admits that Mochizuki Shinichi has proved the ABC conjecture.

Oh, I have mentioned it before, but I guess many people have forgotten that Professor Mochizuki Shinichi is a doctoral student of Faltings, a German mathematics master who is always known for his seriousness, and he started studying at the age of 23.

Faltings got a doctorate degree certificate in his hand, which shows that his strength is indeed extraordinary.

In addition, there are rumors on the Internet that Mochizuki Shinichi is the founder of Bitcoin "Satoshi Nakamoto" and has long been one of the world's hidden richest men.

Qin Ke did not expect that this weirdo who was almost 55 years old but still maverick and immersed in his own mathematical world would actually come to Sweden to listen to his lecture on n-s equations.

Qin Ke shrugged: "He will come when he comes."

Ning Qingyun's face changed slightly, and she lowered her voice and said: "They also said that Mochizuki Shinichi claimed to have found a loophole in our paper "Proving the existence of smooth solutions to n-s equations in three-dimensional space" a few days ago. This time they are afraid that

Those who will come will be unkind."

Jiang Chao and Jiang Qi next to them both looked at Qin Ke in surprise.

Qin Ke just smiled indifferently and said: "Yeah, let him let his horse come over."

The two Japanese mathematicians walking in front walked to the left at a fork in the road. Qin Ke was not interested in following these two people anymore, so he pulled Ning Qingyun and walked to the right. Seeing that Ning Qingyun didn't say much,

Moreover, the little hand holding his own was raised nervously, as if he was recalling the details of the paper and wanted to see if there were any loopholes. Qin Ke couldn't help but laugh and said:

"Don't worry, I've also read the four pre-printed manuscripts written by Mochizuki Shinichi that introduced the ieichmuller theory (Interuniverse Teichmuller Theory). Although I read Shimmer's translation and it gave me a headache, I probably know this guy.

At such a level, he can't find fault with our paper. Not to mention him, all the math masters in the world who have studied n-s equations, including Tao Zhexuan, can't find faults that don't exist at all."

Qin Ke indeed has such confidence. The proof ideas and even the proof process in this paper are consistent with the S-level knowledge "Exploration and Detailed Solution of Nonlinear Partial Differential Equations "Navier-Stokes Equation" (Final Chapter)"

They are mostly the same. The "small differences" are just because Qin Ke and Qin Ke used different methods to deal with the problems with the same purpose. It is not a mistake or omission.

Seeing that Qin Ke was full of confidence, Ning Qingyun finally felt relieved. If she had the most confidence in anyone, it was definitely Qin Ke.

After visiting the Nordic Museum, the four of them went to taste the traditional Swedish delicacies of meatballs and roast suckling pig.

The roast suckling pig in Stockholm is very different from that in China. It is mainly paired with Swedish sausage, sauerkraut and mashed potatoes. You can also add seasonings such as chili sauce and mustard. The meat tastes delicious and the taste is varied, which is very unique.

That night, not long after they returned to the hotel, they received a video call invitation from Professor Tao. However, Professor Tao had already checked into the Stockholm Grand Hotel and learned from the conference staff that Qin Ke and his wife had arrived, so he wanted to invite them.

Get together.

Qin Ke and Ning Qingyun took a shower, took off their camouflage clothes, changed back to their normal clothes, and went to the Stockholm Hotel accompanied by Wei Feng and Wei Jing.

Wang Changai was extremely excited when he saw the two of them: "Brother Ke...sister-in-law..."

"Chang Ai is in good spirits!" Qin Ke patted him hard on the shoulder and greeted Professor Tao: "Professor Tao, I haven't seen you for a long time."

Professor Tao was still staring at the laptop screen. When he saw Qin Ke coming into the room, he waved to him and said with a smile: "Professor Qin, many people on the Internet are speculating about your chances of winning the Einstein Science Prize.

Someone also sent me an invitation, saying that they would give me five million dollars to give me a more reliable probability."

"How about you give me a 50% probability, and then we split the five million dollars equally?"

Qin Ke and Professor Tao looked at each other and laughed.

Professor Tao opened his arms and hugged Qin Ke vigorously: "Congratulations on your new mathematical results, my friend. And of course, you, Professor Ning. I still want to know a lot of details about your paper.

Continue to communicate with you two, come on, let’s have a sleepless night tonight.”

Of course, the sleepless night was just a joke, but Qin Ke and Ning Qingyun still had an in-depth discussion with Professor Tao for nearly three hours before being "released" back to their hotel.
To be continued...