Technology invades the modern world

Chapter 32: All of This is Related to Missile Trajectory Optimization
In the tiered classroom of Xiangjiang University, sunlight shines through the window lattice and falls on Lin Ran's lecture notes.

"Everyone, the roll call just now was to get to know you all."

On the first night in Hong Kong, Lin Ran attended a banquet hosted by Hong Kong celebrities, and the next day he started the seminar without stopping.

After calling the roll, Lin Ran could be sure that the person sent by China was Chen Jingrun, combining the surname Chen and the photo of Chen Jingrun when he was young that he found on the Internet in 2020, as well as the other party's temperament that was out of place among the 50 people in the classroom. It was Chen Jingrun who was sent.

He felt relieved that the Chinese side did not underestimate him and sent a true genius.

Lin Ran had guessed the same before. As long as the Chinese side paid enough attention to him, the person who came would most likely be Chen Jingrun.

Because at this point in time, only Chen Jingrun was the most suitable.

"Very good, all 50 people are here. Because my time in Hong Kong is limited, I asked Hong Kong University to prepare a written test for me before coming here.

The purpose is to set a certain threshold so that everyone can keep up with this course.

After all, if there is no threshold, there is no way I can finish what I want to say step by step in two months.

For students who have no mathematical foundation, what I am going to talk about may be a bit difficult.

Well, since you are all excellent students with a basic knowledge, I will not talk about things like what calculus is, the basics of linear algebra, and differential equations.

We start directly with functionals and function spaces.

And let me tell you first, the theme of my seminar is: "On the Extreme Properties of Functional Spaces under the Action of Symmetry Groups: Explorations from Harmonic Analysis to Algebraic Geometry."

Li Shaoyuan always thought that he had some talent in mathematics, but he found that although he was listening very attentively, he gradually fell behind and had no idea what Professor Lin was talking about.

He glanced at his deskmate who was listening attentively. He remembered that this guy's name was Chen Dehui when the roll call was called earlier.

In Hong Kong at this time, the poor, especially the refugees from the mainland, usually wore cheap cotton clothes produced by local factories. These clothes were breathable but rough and came in relatively simple colors.

Rich people like to wear Hawaiian shirts, which are popular in America nowadays, preferably with patterns.

Chen Dehui was wearing a cotton short-sleeved shirt, while Li Shaoyuan was wearing a Hawaiian shirt.

"Hey, can you understand what the professor is saying?" Li Shaoyuan asked in a low voice.

At this time, Chen Jingrun, using the pseudonym Chen Dehui, replied in clumsy Cantonese: "Of course."

Then he ignored Li Shaoyuan.

Li Shaoyuan poked the other person with his pen again, "What is Professor Lin talking about?"

"He is using the example of the orthogonality of Fourier series to teach us the concepts of norm and inner product." Chen Jingrun said as if it was a matter of course.

Obviously, functional analysis was a piece of cake for him, as he had already learned the basic concepts a long time ago. However, the examples and aspects chosen by Lin Ran made him feel suddenly enlightened, and he thought to himself that the other party was indeed a master.

The whole teaching process feels like a heavy sword without a sharp edge and a great skill without effort.

However, even Chen Jingrun could sense Lin Ran's urgency. He spoke clearly but also very quickly. After he finished speaking, he was eager to move on without asking whether anyone had understood.

When Chen Jingrun was in China, he had listened to other people's lectures and also taught students, but he had never seen this style.

Li Shaoyuan was a little skeptical about his life because he found that his deskmate, who was obviously from the lower class of poor, had two words written all over his body from his clothes to his temperament: no money.

I can actually understand it.

After the course ended, he was impressed and said, "Can you tell me about it? I'll pay you." He then pulled a handful of Hong Kong dollars from his pocket. Chen Jingrun was tempted, but considering that he would have to go back and copy it down, put it in a designated place, and then transmit it back to the mainland, he had to decline. This was a month's salary in mainland China.

When Li Shaoyuan returned home, his sister, Li Huiling, also studying at the University of Hong Kong, whose English name was Helen, quickly took his schoolbag and asked, "Brother, how's it going? Did you get Professor Lin's autograph for me?"

Li Shaoyuan handed Li Huiling the inaugural issue of Advances in Mathematics, which contained Lin Ran's paper proving Fermat's conjecture. "Yes, Professor Lin, please sign the title page."

After Li Huiling opened it, she saw the words "Lin Ran" written in large letters and screamed excitedly, "Thank you, brother! You really are my brother!"

Now those bitches must be jealous to death, right?
I asked you to invite Professor Lin to our house for dinner. Have you told him?"

Li Shaoyuan shook his head and said, "No, it's only the first day, why rush?"

Li Shaoyuan and Li Huiling are from the Li family, but not the Li family of Li Chaoren, but the Li family of Li Guanchun, the founder of Bank of East Asia.

For them, being able to marry Lin Ran is definitely a good choice.

Moreover, old-established families like Li Guanchun are well aware of the value of Professor Horkheimer's last disciple, and are also aware of the influence of the Frankfurt School in America, England and the entire Western world.

Professor Horkheimer publicly admitted that he was Professor Horkheimer's last disciple in an interview.

Both Lin Ran himself and the Frankfurt School behind him are enough to make the old families in Hong Kong excited.

This is the gold content.

However, the number of people in the entire seminar was decreasing, with 50 people on the first day, 47 people on the second day, and 40 people on the third day.

After a week, only 20 people were able to attend the seminar, a reduction of more than half.

Li Shaoyuan, who prides himself on being a genius, couldn't handle it because he couldn't understand what Lin Ran was saying. He just sat there doing nothing for the whole day.

It's really painful.

Lin Ran had already talked about symmetry and extreme value research, and Li Shaoyuan felt like he was listening to a foreign language.

Even Chen Jingrun found it difficult, because this was already entering the core of the calculus of variations.

On the surface, it is a study of symmetry and extreme values, but its core is the calculus of variations.

Lin Ran uses string vibrations to package possible disturbance terms in aerospace.

Wrapping Noether's theorem with the fact that symmetry is a mathematical law of nature.

Use the motion of a pendulum to illustrate the trajectory of a missile.

The students present found it obscure and difficult to understand.

The Hong Kong media reported this incident extensively, but instead of criticizing Lin Ran, they praised him, saying that the master was worthy of being a master.

When you are famous, your problems are not problems, but rather a manifestation of your ability.

The world is so wonderful.

When the lecture entered the third week and began to talk about extreme value problems combining variational calculus and group theory, Lin Ran seized the opportunity when 14 of the remaining 13 students went to the bathroom.

When only Chen Jingrun's alias, Chen Dehui, was left sitting there frantically taking notes, he quietly walked over to the other person and whispered:
"These are actually all related to the optimization of intercontinental missiles."

(End of this chapter)