Chapter 115 Supercubic Weakly Damped Wave Equations with Delay Term 1
Chapter 115 The Existence of the Uniform Attractor of the Super Cubic Weakly Damped Wave Equation with Time Delay Term
Soon, Lin Xiao moved into his own house with the help of Teacher Liu.
Two bedrooms and one living room are naturally quite spacious and comfortable for one person, and the conditions are better than the dormitory of the Chinese Academy of Sciences where Lin Xiao lived when he participated in the IMO training.
The various living facilities around Yanbeiyuan are also very complete, so there is basically nothing to worry about.
Later, with the help of Teacher Liu, Lin Xiao also bought various daily necessities in a nearby shopping mall, such as bedding, toothbrushes and other items.
After thanking Teacher Liu, Teacher Liu stopped staying any longer and left a phone number for him to call if he needed anything, and then left here.
And only Lin Xiao was left in the room.
Looking at the house, he lay down directly on the sofa.
"Huh~"
Close your eyes and take a few deep breaths.
In the next two years, I will stay here peacefully and contentedly.
Hope the future will be better.
Soon he stood up, opened his suitcase, took out "Fundamentals of Materials Science" from it, and started reading.
After Lin Xiao came back from the International Congress of Mathematicians, he began to learn knowledge about other subjects. In the past few days, he had read Dawu, Dahua, Dasheng, and Dajiji. Each book gave him 5 points of experience.
and 0.5 truth points. At the same time, the level of each subject has been officially upgraded to level 1, including a total increase of 0.2% in brain development.
After he has read his current material foundation, he will be able to be provided with corresponding experience in materials science and a 0.05% brain development level.
After that, he could continue to concentrate on his mathematics and learn something about physics.
However, these things will have to wait until later.
…………
School has just started, and naturally there are many things to do.
The first is a class meeting.
Students from Class 1 of the Mathematics Department of 2018 gathered together to get to know each other.
When Lin Xiao arrived, most of the students in the classroom were sitting with their roommates, while some who were not yet familiar with their roommates were playing with their mobile phones by themselves.
But if you look at the past, they are all male compatriots, and there is not a single female compatriot.
Lin Xiao immediately realized how lucky he was to meet a senior sister when he signed up.
Maybe asking that senior to be responsible for the registration of new students is a fig leaf for their mathematics school, right?
It’s really something that makes the listener sad and the listener in tears.
However, Lin Xiao just sighed and didn't care too much. What does this have to do with him?
Women will only affect the speed at which I can do the questions.
After entering the classroom, he found that none of the classmates seemed to notice him, so he quietly walked in and sat in the last row.
However, when he sat down and turned his head, he was immediately startled because the group of people suddenly focused their attention on him.
Good guys, are you looking at Schrödinger?
You didn't even look at me when I came in just now. Then you looked at me when I sat down?
Naturally, these students also shouted enthusiastically.
"Lin Shen!"
"Lin Shen is actually in our class!"
"Wow!"
…
Lin Xiao could only wave to them, "Okay."
Several of them even came up and talked with him about old times.
Because these people were all students who had participated in the national mathematics training team, they all knew Lin Xiao.
However, after a while, a few more people came into the classroom. Lin Xiao took a look and thought, oh, they are also old acquaintances.
It was Ouyang Sheng, Sun Yu and Li Boyuan. The three of them all enrolled in the Mathematics Department of Beijing University. They had guessed that they would become classmates in the university, but they did not expect that they actually became classmates now.
The three of them also saw Lin Xiao, and naturally they all ran up excitedly.
"Lin Shen!"
"Sure enough, we meet again!"
"Lin Shen, you are really awesome! How does it feel to show off at the International Congress of Mathematicians?"
"Can that be called showing off?" Lin Xiao said angrily: "That's called academic exchange."
"As expected of Lin Shen, he actually didn't think it was pretentious. It seems that it is normal for Lin Shen to do such a thing."
Lin Xiao: "..."
"By the way, which dormitory do you live in, Lin Shen?" Sun Yu asked at this time.
When other people heard this question, they also became confused, yes, where does Lin Xiao live now?
"I live off campus. The school arranged for me to live in the teachers' apartment, Yanbeiyuan."
other people:"……"
Sorry to bother you.
Is this how a god of learning is treated?
He was obviously a student, but he ended up living in a teacher's apartment. It seemed like he was living for free.
Some people checked Yanbeiyuan and were even more shocked when they saw the house price of 88,000 per square meter.
People live in houses worth millions, but they live in ordinary dormitories?
Suddenly, they had nothing to think about except envy.
…
Lin Xiao and the others continued chatting, and after a while, a man who looked quite young, but obviously more mature than Lin Xiao and the others, walked in.
This is the counselor of their class, his name is Wang Wei. He also graduated with a Ph.D. in Mathematics from Peking University. After graduation, he chose to stay in school as a teacher.
They were all young people, so Wang Wei did not talk to them in a long way, but simply said a few words and asked them to introduce themselves. When Lin Xiao went up to introduce himself, these students had to make a fuss.
.
Then I will talk about some things to pay attention to when starting school.
For example, military training.
Lin Xiao was stunned when he heard that military training was required.
Damn it, he lives in Yanbeiyuan and has to get up at six o'clock every morning for military training. How can he do this?
So until the end of the class meeting, he ran over to ask Wang Wei.
"You live in Yanbeiyuan?"
After hearing the news, Wang Wei couldn't help but envy Lin Xiao's treatment. As a counselor, he couldn't even apply for residence in Yanbei Garden and could only live on campus.
However, in response to Lin Xiao's question, Wang Wei still said: "Then you can live with me during the military training. There are two beds in my dormitory, but I live alone. I also have spare quilts and sheets. You can
Just take those toothbrushes over."
Hearing Wang Wei's suggestion, Lin Xiao couldn't help but feel happy, "Thank you, Teacher Wang."
"No, help Lin Shen. It's my honor. Don't call me Teacher Wang. Just call me Lao Wang."
Wang Wei smiled and waved his hands.
"Old Wang... why don't I call you Awei?"
With a place to go, Lin Xiao felt relaxed now and was in the mood to joke.
"No more... Calling me by my name is better than this."
"Why?"
"I often see awsl when watching videos...you know how I feel."
"……makes sense."
…
Afterwards, Lin Xiao returned to Yanbei Garden after having a meal, and brought some daily necessities and the book on materials science to Wang Wei's dormitory.
However, since Wang Wei was a counselor and it was the beginning of school, he naturally didn't have much time to stay in the dormitory. After making arrangements for Lin Xiao, he went back to work.
Lin Xiao stayed in the counselor's dormitory and took a brief look. The conditions were average, but there was a water heater, which was much better than the student dormitory.
So, he went directly to take a shower, planning to read "Fundamentals of Materials Science" for a while and then rest.
After all, military training starts at 6 a.m., which means he basically has to get up at 5:30.
After taking a shower, Lin Xiao returned to the table on his bed.
There was a stack of draft paper on the table with a series of patterns on it. Lin Xiao estimated that Wang Wei left it when he was studying the problem on this table.
After all, this is a double room with two tables, but Wang Wei is the only one, so he can use it as he pleases.
However, Lin Xiao did not read it, but continued to read his book, because there was still a little content left to finish, and he would probably finish it tonight, as it was only just before eight o'clock.
Soon, after ten o'clock, he put down the book in his hand.
After finishing reading the book, he also received a voice from the system.
"The brain development level has reached 3.65%... very close to the original 4%."
It's just that if he wants to break through 4%, I'm afraid there is still some difficulty. Although reading books can increase his experience and upgrade other subjects to level 2, as far as the current situation is concerned, he still has to read dozens of books to master them all.
Raising it to level 2 would take too much time, and he still had his own things to do.
"Let's take it step by step slowly."
Shaking his head and thinking no more, he stood up and stretched. Suddenly, out of the corner of his eye, he glanced at the pile of draft paper on the table.
"Would you like... to take a look?"
He was rather curious about what the counselor Wang Wei was studying.
So he took it over and looked at it briefly.
[Existence of uniform attractor for supercubic weakly damped wave equation with time delay term]
"Is this the title?"
Lin Xiao couldn't help but be stunned.
This is a physics problem...
But if it is Wang Wei’s research, does it fall into the category of mathematical physics?
Mathematical physics is to seek mathematical descriptions of physical phenomena, and to summarize physical things into the field of mathematics to solve them.
Therefore, strictly speaking, it should belong to the field of physics, not mathematics.
Of course, since problems in mathematical physics have very high requirements for mathematics, not to mention that mathematical physics is not divided into different disciplines, so the gap between the two is not big. Many mathematicians choose to study physics in the end.
It's just that Lin Xiao obviously hasn't studied physics enough to understand these things. For example, he has never understood things like the weakly damped wave equation.
Of course, he still had some interest in physics and started reading from the beginning.
"Hmm... I think you can understand a little bit?"
The first is the time-delay differential equation. Lin Xiao knows this. After all, it is something in mathematics. Anyway, it is a type of differential equation. The main feature is that the derivative of the unknown function at a certain moment is determined by the function at the previous moment.
Lin Xiao had already understood this part when he first learned it.
In addition, some nouns that Lin Xiao didn't know appeared in the scratch paper, but when these nouns were converted into mathematical form, Lin Xiao found that he suddenly understood the physical meaning of this noun.
Mathematics is the language of the universe and can represent everything.
Of course, such a 'representative' is very abstract to others, but it is not abstract at all in front of Lin Xiao.
Some physicists can directly see through the intuitive images behind complex mathematical formulas and proofs. Edward Witten, who proposed the M theory, is one of them. He was able to complete a task that mathematicians have not really understood yet.
When proving, you can directly predict what has been proved, and it is often accurate.
For Lin Xiao at this time, he almost figured out what the physics term meant through this method. If he was really unsure, he could just check it online.
And he often finds that his guess is correct.
I woke up late today, and my hair was a little late...