Black Technology Incubation System

Sun Jiu chose a beef hot pot in clear soup that has become popular recently.

There were quite a few people in the hot pot restaurant, but fortunately Sun Jiu had reserved a seat in advance, and the two of them were led to a private room by the waiter, so they sat down.

This beef hot pot restaurant pursues the original taste, and the soup base is not too fancy. It is the simplest beef bone soup with a little ginger and salt, but because of Sun Jiu's personality, he wants to order more A little beef rib with muscles is put in it.

It was not the first time for the two of them to eat this hot pot. They skillfully scooped a spoonful of clear soup into the bowl and added some celery.

After drinking the soup to warm up the stomach, the previously ordered dishes have also been put on the table.

First boil a few slices of tender meat and eat, followed by Diaolongban and Ningren, followed by Gu Xingyi's favorite beef basil and Sun Jiu's pork belly. At the same time, I did not forget to put in some white radish and lettuce .

Neither of them likes spicy food, so there is only sand tea sauce in the plate. After a meal, they are sweating profusely, and their lips and teeth are fragrant.

Only after you are satisfied, can you chatter.

"How's the recent period? Is the laboratory fun?" Gu Xing planned to forget about mathematics as soon as he came out, and asked about the life of his friends with great interest.

Sun Jiu shook his head: "It's not fun at all. Although the few rabbits in our laboratory are almost fat like pigs, with this indicator, they have not reached the level of clinical trials. Now the instructor asks me to take them to lose weight every day."

His tone was full of helplessness, and Gu Xing immediately imagined that this person was being dragged forward by two huge white balls.

Of course, it is possible that he dragged two big white balls forward.

"It's not easy," Gu Xing smiled, and brought him another beef ball to comfort him, "So what experiment are you going to do with rabbits?"

The next second he realized that this question might involve confidentiality, he quickly shook his head and said, "If it's something you can't say, just pretend I didn't ask."

"What kind of secrecy activities can I, an undergraduate, participate in?" Sun Jiu was amused by him, "I seem to be studying some kind of virus. This virus is far away, and currently only spreads among monkeys, and there is no possibility of mutation."

After introducing himself, he asked again: "What about you, you are tortured by your teacher Lou, are you still studying math?"

"How can mathematics be called torture?" Gu Xingyi refuted him righteously, "Now I have completely devoted myself to mathematics."

"What? You don't plan to give them to your future boyfriend?" Sun Jiu picked up another piece of coriander and ate it slowly, "Are you planning to be single for the rest of your life?"

"How could it be a single dog? Don't I already have a harem now?" Gu Xing said this with joy, his eyes seemed to be shining.

This expression caused Sun Jiu to hesitate, he still knew about Gu Xingyi's life, this guy was just a steely man who didn't understand style, he was born alone for thousands of years, how could he cheat a boyfriend.It's just that this guy's expression is too turbulent, it can be said that his face is full of spring, as if he really has such a harem.

"Could it be that you have a boyfriend behind my back?"

"What does it mean to be behind your back, don't use a dignified tone to be sour and jealous?" Gu Xing taught him arrogantly.

Then I took out six books from the schoolbag on the back: "Let me introduce to you, the current imperial concubine - functional analysis, imperial concubine - ordinary differential, four concubines - real division, compound division, probability, statistics. These are my six harem, I love and cherish them now, carry them with me, and never separate them for a moment."

Facing six books, Sun Jiu understood why Gu Xingyi was carrying a big schoolbag when he came in.He used to only know that Gu Xingyi never talked about feelings, but he didn't know that he could still talk like this.

"Admiration!" Sun Jiu could only cup his hands to express his admiration.

"You don't need to admire now," Gu Xing said in a heavy tone, with a look of concern for the country and the people on his face, "I'm just a few princesses who have conquered the field of mathematics, and there are beauties in the field of physics, chemistry, biology and other fields waiting for me. Collect it."

"You scumbag!" Sun Jiu suddenly felt a little itchy, wanting to slap these books on the face of this smelly and shameless thing.

Nothing lasts forever.

The two fought for a while for two days, and then separated again with their hands full.

This summer, Sun Jiu will go to the countryside to promote medical knowledge, and he will get on the bus soon.

When we left, we didn't have anything to say. Since we had already met and laughed, we just went on the road with our blessings.

Gu Xingyi's destination was the library.

Lou Jianyue's collection of books is not small, but for mathematics, a subject with a long history, extremely deep, and many branches, it is still too rare.

How can a trickle of water compare to the sea?How is the light of a firefly like a bright sun?

Therefore, Gu Xingyi had no choice but to leave Lou Jianyue's house in the next stage, and go to the nearby large library to find more sources of knowledge.

Then when I go back every day, I will report today's harvest to Lou Jianyue, and answer my doubts by the way.

The nearby Physical and Chemical University Library is a pair of twin buildings, connected by a silver circular track, and above the track there is a huge spherical venue as a special venue, which looks like a planet from a distance, quite unique Technology sense.

It has the most abundant and complete collection of books on mathematics, physics, chemistry, biology, astronomy and other aspects of the country. In the special venue Starry Sky Museum, there are even tens of thousands of manuscripts of great scientists since the dynasty and the first generation of cross-era inventions. sample.

It is a glorious collection of human minds, a display of the achievements of generations of people exploring nature and pursuing truth, and it is also a holy place of pilgrimage for everyone who devotes himself to this great cause.

Gu Xingyi has always known that there is such a library. When he was a boy, he also used to go there as a volunteer, doing some work such as book classification, but later he started to study liberal arts, so he never entered this library again. library.

He entered the gate, went to the service desk on the right and took his ID card to apply for a library card. Then he went up to the third floor according to the index, and reached the first floor full of mathematical works.

There are not a small number of people who come to the library that is open to the public. People of all ages can see it, from the energetic elderly to the young children who are babbling. They are not necessarily looking here. Collecting books must be serious study.

This can be regarded as a characteristic of the country.Chaoguo has always been famous all over the world for his strong style of study and pragmatic spirit.The international students who come out of here are often the most diligent, hardworking and talented group of people.It's just that the country has experienced hardships after all, and it didn't start to develop long enough, and its research and insights in top science have always been a little bit worse.

As soon as Gu Xing found a seat and sat down, he began to prepare for the dissertation. The first step was to determine the general direction, and then further supplement the knowledge points and refine the direction.

It is impossible not to make up the knowledge points. The knowledge of undergraduates only gives people a general understanding of mathematics. Compared with more and more in-depth research, it is not enough at all.

Gu Xingyi first invited the six beauties out, thought about it for a while, and finally made up his mind - take a dice.

From one to six, I will choose whichever one is thrown.

The heavens are spirited, the earth is spirited, Chen Laoqiu blesses you!Gu Xing tossed the dice, buckled one in his arms, and then opened it to have a look.

Papers on functional analysis... Gu Xing thought nothing of it, so he turned on his computer and went to HowNet to have a look.

It's not that I don't want to read arX first, but that the papers on it are all in English, which seems to be a lot of pressure, and at least part of HowNet is Korean papers.

Emmm, if you want to send an E-level paper, you only need Korean script, but if you post SCI, Eagle script is better.

There are three general directions in functional analysis: space theory, operator theory and nonlinear functional analysis.

The first two are relatively pure, and the research can be regarded as digging deep into the functional oil field, especially the operator theory, which is definitely the current mainstream focus and is also the direction recommended by Brother Lou.

On the other hand, nonlinear functionals tend to be applied mathematics, with a wide range of applications, and can be cross-combined with popular fields. They cannot be published in top journals, but they are preferred by better journals.

However, Brother Lou doesn’t like this category very much. His mentor comes from a school that insists on pure mathematics. He is a follower of Gauss and Hardy, and he has his own pride. Their science, because of its distance from the daily activities of human beings, retains its purity" and "If mathematics is the queen of sciences, number theory is the queen of mathematics because of its extreme uselessness".

Gu Xingyi did not comment on this, he respected everyone's freedom of thought and choice.Whether someone is proud of the purity of mathematics, arrogantly attacks applied mathematics and other science and engineering subjects, promotes pure mathematics to despise the top status of the chain, or someone regards mathematics as a tool, as the foundation of the temple of science rather than the place where the glory shines, he is all Will not evaluate rashly.

However, although he is still young and has only just stepped into this field, he has already vaguely had a completely different point of view from his first teacher in his heart-mathematics must be proud of its great role in application.

Gu Xingyi had read Hardy's "Confessions of a Mathematician" describing the necessity of pure mathematics. Unlike most people's discussion of purity, what impressed him deeply was that "if number theory can be applied to any practical and prominent purpose, Gauss or any other mathematician would never be so foolish as to lament or regret such an application if it could directly increase human joy and reduce human suffering as physics or even chemistry do."

The sages thought so, why did he feel that the application of mathematics to seek the well-being of mankind is a taint to mathematics?

As long as Brother Lou continues to engage in academics with him after he embarks on this path.Gu Xing thought about it, took out the draft paper, and wrote down the directions, nonlinear functional analysis.

However, the functional analysis of undergraduates is mainly the geometry of simple Banach spaces and Hilbert spaces, generalized function theory, bounded linear operators and compact operators on Banach spaces and Hilbert spaces, and has not yet reached the field of nonlinear functionals.

Alas, Gu Xingyi wrote a few words about learning nonlinear functionals in the first article on the draft paper.

That's what it means to hate a book when it's time to use it.

The differential theory of Banach space, topological degree theory and nonlinear dynamical system, PDE and variational method in nonlinear functional analysis have important applications.

So you can add basic physics, economics, and engineering knowledge.

Gu Xing sighed and wrote another line.

In fact, if a mathematical researcher who has received formal training and is studying for a Ph.D. will not delve into these strange subjects at this time, but find a scholar in a related field to cooperate with. However, in Gu Xingyi's case, there is no relevant Scholars in the field cooperate, and there is only being led by them. If this path is not suitable, what can be done.

So he silently walked on a road less traveled by—I, Gu Xingyi, can do anything.

When leaving the library, Gu Xingyi strolled home with the book "Linear and Nonlinear Funal Analysis with Applications".

"How did you study today?" Lou Jianyue came out of the study and greeted him gently.

Gu Xingyi struggled to pull out a smile: "Fortunately, it's just that my head is a little cold."

The author has something to say: There are too many strange words in this chapter, you can ignore them.

Let me introduce Hardy. Hardy is known as an outstanding analyst in the 20th century. His mathematical contributions involve analytic number theory, harmonic analysis, and function theory. For his time the leader of British pure mathematics.

He was disgusted by the application of mathematics, especially to war.He regarded pure mathematics as real mathematics and drew a line from applied mathematics.For example: "Pure mathematics is obviously more useful than applied mathematics on the whole. A pure mathematician seems to have an advantage not only in aesthetics but also in practical aspects. For useful things are mainly skills, and mathematical skills are mainly transmitted through pure mathematics. of.

In addition, the story of him discovering and helping Ramanujan in the Indian mathematics community is also a good story.