In the next three hours, Pang Xuelin threw out a total of fifteen questions.

Some of these problems have existed before, such as the Riemann conjecture, the Iwasawa conjecture, the Hopf conjecture, and so on.

Some are new problems further deduced by Pang Xuelin through Ponzi geometry theory.

These problems are intrinsically related to the nature of algebra and geometry.

As long as these fifteen problems can be solved completely, then mathematicians can clearly show that they have found a great unified theory between algebra and geometry.

Of course, for the time being, this theoretical construction is still far away.

The Riemann conjecture alone is like a magnificent Himalayan mountain range that stretches before mathematicians all over the world.

If you want to climb this mountain range, the right route requires talent, strength, and luck.

Not to mention, the remaining fourteen math puzzles.

It was not until the evening that Pang Xuelin finished listing these fifteen propositions one by one, ending this speech that had a profound impact on the entire mathematical community.

"Well, that's all for today's speech, thank you very much for listening. Later, I will upload the content of today's speech to the pre-print website for you to download and read, thank you. ”

Pang Xuelin looked around and said with a smile.

Soon, Marcello Sivina, chairman of the organizing committee of the conference, and Carlos Kenny, president of the International Mathematical Union, stood up and applauded, followed by Faltins, Pierre de Ligne, Andrew Wiles, Robert Langlands and others sitting next to them.

Soon, applause spread throughout the conference hall, and almost everyone stood up to pay their respects to the young man on the stage who stood almost at the pinnacle of today's mathematical world.

In the corner at the back of the conference hall, Ai Ai applauded enthusiastically, her cheeks flushed with excitement.

"Sister Zuo, I must graduate as soon as possible."

"Why?"

Zuo Yiqiu on the side was puzzled.

Ai Ai smiled and said, "After graduation, I can pursue my master openly." ”

"But, he already has a girlfriend."

Zuo Yiqiu frowned and said.

Ai Ai smiled and said, "My master already has two girlfriends, why can't he have a third?" ”

Zuo Yiqiu pursed his red lips tightly, and he couldn't complain about Ai Ai's logic.

Although she knew very well that Ai Ai's idea was wrong, for some reason, she was a little envious of Ai Ai's daring to love and hate, and she didn't say a word of admonition.

Pang Xuelin naturally didn't know what the two girls in the audience thought at this time, and when he stepped off the stage, those bigwigs in the mathematics world surrounded him one after another. Gather him in the middle.

"Professor Pang, today's speech is good, I think it is more important than solving one or two conjectures, and the mathematical community needs this kind of deafening voice."

"In the past, I have always been a little confused about the future development direction of mathematics, although I have similar concepts in my heart, but it is difficult to express them clearly.

"Pang, if it weren't for my age and my energy couldn't keep up, I would have felt the urge to re-enroll in graduate school under your name."

"Professor Pang, I'm Gustavo Andreev, Rector of St. Petersburg University, I wonder if you have time in the near future, can you come to St. Petersburg University to give a lecture?"

……

After finally dealing with many enthusiastic mathematicians, Pang Xuelin went to the banquet hall accompanied by Carlos Kenny and Marcelo Sivina.

This evening, the Organizing Committee of the International Congress of Mathematicians and the City Government of St. Petersburg will hold a grand dinner to entertain these guests from afar.

Pang Xuelin naturally became the focus of the banquet.

Those who know and don't know will come to the door to chat with him.

By the time it was all over, it was nearly nine o'clock in the evening.

At this time, Pang Xuelin saw Tao Zhexuan and Schultz walking over together with champagne.

"Congratulations, Pang, today's report meeting is the best I have ever heard."

Peter Schultz said.

"Thank you."

Pang Xuelin clinked glasses with Tao Zhexuan and Peter Schultz respectively.

At this time, Peter Schultz said: "Pong, there is something I want to trouble you. ”

"Whatever, just say it."

Schultz pondered for a moment and said, "I plan to go to Jiang University as a visiting scholar for a year to participate in the Ponzi geometry seminar. ”

Pang Xuelin was slightly stunned, and the expression on his face did not show much surprise.

At today's dinner, more than one mathematician has already made a similar request to Pang Xuelin.

Among them are Fields Medal winners like Martin Hale and Akshai Venkates, and it would not surprise him to add another Peter Schultz.

Pang Xuelin turned his gaze to Tao Zhexuan beside Peter Schultz and said, "Teacher, what about you?" ”

Tao Zhexuan smiled: "I also have the same idea, today's report meeting, let me change the previous research plan, I need to have a more in-depth study of Ponzi geometry theory, going to Jiang University Ponzi geometry seminar is undoubtedly the best choice." ”

Pang Xuelin laughed and said, "No problem, you are willing to come, it's too late for me to be happy." ”

These are the backbone of the current mathematical community, and after coming to Jiangcheng University, Pang Xuelin can just pull them to the Jiangcheng Institute for Advanced Study to do theoretical research.

With such a group of top mathematicians in charge, even if they don't take action themselves, they will only bring students, they will provide strong support for the development of Qiantang Laboratory.

Schultz and Tao Zhexuan chatted with Pang Xuelin for a while, and at this time, Ai Ai and Zuo Yiqiu also came over with champagne.

Tao Zhexuan patted Pang Xuelin's shoulder, and said with a smile: "Pang, I won't disturb you chatting with the girls." ”

Pang Xuelin smiled a little awkwardly and didn't say anything more.

"Master, congratulations, come, I'll give Master a drink."

Ai Ai had obviously drunk a lot of alcohol tonight, her face flushed a little, and she had some invoices as she walked.

Pang Xuelin clinked glasses with Ai Ai and said with a smile: "Drink less, I see you're a little drunk." Also, the day after tomorrow it's your turn to make a presentation, how are you preparing? ”

Ai Ai smothered all the champagne in the glass and said, "Don't worry, Master, I have been ready for a long time, and I promise not to let you lose face." ”

Pang Xuelin smiled and said to Zuo Yiqiu on the side: "I see that this girl is a little drunk, you can send her back to rest." ”

Zuo Yiqiu nodded, and was about to speak, when he heard Ai Ai say, "Master, I'm ...... I'm not drunk......"

As she spoke, she tilted her body and fell straight towards Pang Xuelin.

Pang Xuelin hurriedly held her up, and said with some tears and laughter: "I still said that I wasn't drunk." ”

Zuo Yiqiu hurriedly walked to the other side and helped Pang Xuelin hold Ai Ai.

Even so, more than half of Ai Ai's body leaned softly on Pang Xuelin's body.

Pang Xuelin was a little helpless, so he had to help Ai Ai return to the hotel room with Zuo Yiqiu.

Finally put Ai Ai on the bed, Pang Xuelin breathed a sigh of relief, and said to Zuo Yiqiu: "Xiao Zuo, I will work hard for you to take care of Ai Ai today." ”

Zuo Yiqiu nodded and said, "Professor Pang, you should go back and rest quickly." ”

"Hmm!"

Pang Xuelin was about to turn around and leave, when he saw Ai Ai turn over and mutter, "Master, I like you......"

“……”

The air in the room suddenly fell silent.

Pang Xuelin's face was strange, he looked at Zuo Yiqiu and said, "How much wine has this girl drunk, why is she talking nonsense?" ”

Zuo Yiqiu laughed twice, glanced at Pang Xuelin, and did not answer.

Pang Xuelin blinked and said, "Thank you for the matryoshka dolls." ”

After speaking, without waiting for Zuo Yiqiu to react, he left the room directly.

Zuo Yiqiu took a sip and went up to close the door of the room, and then, as soon as she turned around, she was suddenly startled, only to see that at some point, Ai Ai had already sat up and looked at herself in a daze.

"Ai Ai, you...... You're not drunk? ”

"Hee-hee, the smell on the master's body is very good."

A sweet smile appeared on Ai Ai's face, and then, her eyes narrowed slightly, and she looked at Zuo Yiqiu and said, "Sister Zuo, just now Master said thank you for your nesting doll, and he gave him that nesting doll from you?" ”

"You...... What nonsense are you talking about? Why should I give him a nesting doll? ”

"Because you like my master!"

"Ai Ai, what nonsense are you talking about? I...... I ......"

Ai Ai stepped forward and pulled Zuo Yiqiu to sit down beside him, and said with a smile: "Sister Zuo, it's not a big deal to like my master, with my master's ability, after getting along with him for a long time, isn't it normal to like him?" ”

"But...... I ......"

"Okay, don't be, Sister Zuo, do you want to be with my master?"

The room quickly became quiet.

After a long time, the voices of the two women whispering sounded.

……

For the following week, Pang Xuelin stayed in St. Petersburg to continue attending the International Congress of Mathematicians.

His speech at the first day of the conference was not widely reported in the traditional media, but it caused a violent shock in the mathematical community.

Almost all mathematicians gave Pang Xuelin's lecture a very high evaluation, and even raised it to the same level as David Hilbert's 23 questions in 1900.

These fifteen questions are also known as the Ponzi fifteen questions.

Many people believe that these 15 problems will guide the development of mathematics in this century, and if the 15 Ponzi questions can be successfully solved, mankind will undoubtedly complete the complete unification of algebra and geometry.

Of course, in addition to the Ponzi Fifteen Questions, Perelman's report on the Hodge conjecture has also attracted the attention of a large number of mathematicians.

The only regret is that the Clay Institute's $1.5 million prize money still hasn't been given away.

Perelman politely rejected the request of the director of the Clay Institute to award him a prize, to which Pang Xuelin expressed respect for Perelman's opinion.

However, Ai Ai's 45-minute lecture on Ponzi geometry and algebraic topology and the relationship between geometric topology at this conference of mechanics won a lot of attention.

Many people know that there is one more young and beautiful female mathematician in the mathematics world, who has a very good level, and is also a disciple of Pang Xuelin.

In the blink of an eye, ten days passed in a flash.

On August 18, 2022, Pang Xuelin finally ended his trip to the International Congress of Mathematicians in St. Petersburg and returned to Jiangcheng by special plane.

After exiting the airport, Ai Ai looked a little sullen.

Pang Xuelin said with a smile: "What's wrong? Is it that you stay in Russia and don't want to come back? ”

Ai Ai pouted and said, "Master, I can finally come out and play with you for ten days, and we are going to be separated again." ”

Pang Xuelin said with a smile: "Isn't school going to start in half a month?" It's not that you won't be able to see me then. ”，

"I'm just not happy anyway."

Ai Ai Dao.

Pang Xuelin was a little helpless about this female disciple, and couldn't help but give his brain a breakdown, and said: "Don't ink, hurry up and go home, your parents are waiting at home." ”

finally sent Ai Ai away, and Pang Xuelin returned home with Zuo Yiqiu.

In the next ten days, the craze caused by the International Congress of Mathematicians gradually dissipated.

Pang Xuelin finally had free time.

He put his work aside and accompanied Yao Bingxia around the scenic spots around Jiangcheng.

Because Yao Bingxia was going back to Beijing to go to school in September, during this time, Qi Xin tacitly did not follow Pang Xuelin and gave Pang Xuelin to Yao Bingxia.

On this day, another fierce battle ended at night, Yao Bingxia fell asleep beside Pang Xuelin, and the long-lost voice of the system came to Pang Xuelin's mind.

"Please note that in half an hour, the Chinese Sun World will be opened, please get ready."

Pang Xuelin couldn't help but be stunned, he didn't expect that this time he would travel into the Chinese Sun World.

This is not the best science fiction work in Liu Cixin's series, but it is the most plain but sincere work, which left a very deep impression on Pang Xuelin.

The protagonist of the , a rural baby with only a primary school level - Shui Wa, came out of the village and experienced a life journey full of dreams.

Born in an arid village, the water baby lives on rainwater stored in a water cellar, but the water is bitter, astringent, and dissolves toxic substances. In order to be able to drink non-bitter water, Shuiwa came to the coal kiln to do absenteeism, and finally drank the non-bitter water from the deep well.

After experiencing a mining disaster, at the suggestion of a worker, Shuiwa entered the provincial capital to work as a shoe-shiner, and met a materials scientist Lu Hai, who was desperate to sell his patents because he could not find a suitable use for nanomirror film materials.

Until one day, Lu Hai saw the news of the launch of China's solar project, and he was so excited that he encouraged the water baby to go to Beijing together.

This time, Shui Wa became a spider man, that is, a high-altitude cleaner, specializing in wiping the glass of the building, although it is highly dangerous, but the income is not low.

And Lu Hai also became the chief scientist of the "China Sun" project with his own nanomirror film.

During this period, Shuiwa saved a lot of money by virtue of her hard work and successfully bought a house in the capital and became a native of the capital.

And Lu Hai also realized his dream step by step.

The Chinese Sun is divided into two parts, orbital mirrors and a super simulation system, which are capable of changing the thermal balance of the atmosphere and thus regulating the global climate.

However, the Chinese sun also faces some threats, such as the flow of particles ejected by the sun, which will cover the mirror with a fog film and reduce the reflectivity of the mirror.

To this end, Lu Hai held a special meeting to discuss solutions, and when the space agency insisted that scientific elites do this job, Zhuang Yu asked them to experience high-altitude cleaning work, but no one was competent.

Because cleaning the orbital mirror is very similar to wiping the glass at high altitude, in the end, the water baby, under the strong recommendation of Lu Hai, became a "mirror farmer" and flew into space to wipe and clean the silver mirror.

The mirror farmer, represented by the water baby, has also become the first generation of space industry workers.

Twenty years later, the Chinese Sun has completed its mission and is about to leave the earth.

Shui Wa also became an excellent space engineer during this period, and he proposed to release the Chinese sun out of the solar system and become an interstellar spacecraft to explore the distant and unknown depths of space.

This proposal was adopted by Lu Hai, but Shui Wa was not satisfied with this, he hoped to give him a high-reliability microecological circulation system.

Because he will sail into deep space on the Chinese sun, when he wakes up from hibernation more than forty years later, the spacecraft will pass the constellation Centauri, and he will become the first interstellar explorer in human history.

In the eyes of outsiders, this is undoubtedly a suicide with no return, but for Shui Wa, he will take the dreams and missions of mankind and redirect the eyes of mankind to the depths of the universe.

Shui Wa finally realized his dream and became one of the first explorers to set foot in deep space.

Maugham explained a truth in "The Moon and Sixpence": if someone chooses to pick up sixpence on the ground, someone must want to go to the moon high enough, and the value of dreams cannot be measured by money.

The universe is so big that it encompasses the world, but it is not as big as people's hearts.

For the mind contains all things above the universe.

In an increasingly utilitarian society, people are more and more concerned about interests, only focusing on the input-output ratio, but enterprising.

Some people are satisfied with the hot pit head of their wives and children, and never glance outside the world that has nothing to do with them; Some people spend their entire lives just to see things that humans have never seen before.

Modern people, with mortgages and car loans, are cautious and spend their lives just to cultivate one acre and three points of land.

As for when humans will land on the moon again, land on Mars, fly out of the solar system, and rush into the universe, it is completely irrelevant.

The idealistic enthusiasm for space exploration in the last century has become ridiculous.

In this film, the water baby walks down from the village to the coal mine, from the coal mine to the city, from the city to the capital, from the capital to space, and finally from the earth to the universe.

Every time you set off, it is like a child yearning for a brighter place, there is no hesitation, no worries, only simple yearning......

That kind of pure idealism is shocking and moving.

"I don't know what kind of role I will play when I enter the Chinese Sun World this time."

Pang Xuelin was secretly worried in his heart.

But in any case, compared to what Pang Xuelin had experienced before, those sci-fi adventure worlds, there is basically no problem with the safety in China's Sun World.