"That's all for today's class."
"Also, about the final exam..."
Standing on the podium, Li Mu looked at all the students in the lecture theater.
All courses for one semester have ended.
And now there are still countless students coming to his class, almost filling the entire classroom.
There are still many people standing in the corridor.
Originally, according to his estimation, it would only be the first few classes at most, because his reputation would attract many students to come and join in the fun. After a while, there would be fewer students. But what he never expected was that because his class results were pretty good. , On the contrary, more and more mathematics majors in the school are attracted by his class.
There are even some students from other cities who would drive here from other cities just to attend one of his classes.
All in all, every class he has now is almost equivalent to a public class, and his class schedule is almost spread among mathematics students in the UK.
Of course, as time passes so quickly, the classes of this semester have come to an end.
And at the end, naturally there will be an exam.
It's just that after hearing that the exam was about to take place, among the hundreds of students in the audience, the only ones who showed anxious expressions were the more than 50 students sitting in the front rows.
After all, these students are the real students in Li Mu's number theory class, so only they need to face the exam.
Li Mu smiled slightly: "The exam will be held next week, and the focus of the exam..."
Suddenly, the more than fifty students all pricked up their ears and stared at Li Mu's mouth, wanting to know what the focus of the exam would be.
As a result, Li Mu played a trick that all teachers have played before: "Everything I taught in class is the key point."
Immediately, the more than 50 students started to wail, while the other 200 or so students who came over to attend class started laughing. Fortunately, they were just here to attend class and did not have to take exams.
God knows how difficult the questions given by Professor Li will be.
Maybe the foundation is to use some unsolved mathematical problems as question stems - who makes Li Mu like to use this kind of questions to explain in class?
"Okay, that's the end of this semester's courses. Thank you all for accompanying me from this semester on. For me, I have met hundreds of friends my age."
"So, friends, see you next semester. "
"get out of class is over!"
As Li Mu announced the end of get out of class, all the students in the room suddenly stood up in unison.
"Professor Li, thank you for your hard work!"
Li Mu smiled and waved his hand, and then began to clear the desk and prepare to leave the classroom.
But at this moment, a student suddenly shouted to him: "Professor Li, I heard that you are going to complete the question about the Navier-Stokes equation among the seven major problems in mathematics at the International Congress of Mathematicians. The question is, is this true?"
Hearing this question, Li Mu was stunned for a moment, then raised his head and looked at the student.
In fact, other students also looked at him.
He couldn't help but smile, shook his head, and said, "I don't know how many people have asked me this question."
Wiles and Richter asked, Terence Tao asked, and now my own students also ask.
In fact, among the friends I have met in China recently, many people came to ask him specifically about this matter.
It seems that everyone in the mathematical circle thinks that he has completed the proof of this problem-although in fact it is indeed the case.
The students present all laughed, and the student who asked the question also laughed and said: "These are the seven major mathematical problems of the millennium! Of course we all want to know."
Li Mu shook his head, then smiled and said: "As for this issue... you can just pay attention to my report when the time comes."
"I believe you will be pleasantly surprised."
The students present looked at each other in confusion, but then their eyes showed anticipation.
Since their Professor Li said so, there must be a surprise?
…
The one-semester course is completely over.
As for the class about the exam next week, there is no need for him, a full professor of mathematics at Merton College and All Souls College, to be the invigilator.
Speaking of which, although he is also a full professor of mathematics at Wanling College, there are currently no mathematics majors at Wanling College, so there is no need for him to attend classes.
Of course, this is mainly because Wanling College does not accept undergraduate students, only graduate students, and the number of graduate students recruited is still very rare. Therefore, it is more appropriate to say that Wanling College professors are researchers rather than professors.
However, for Li Mu, this can be regarded as reducing his burden to a certain extent.
Not only do you get paid for free, but you also don’t have to work.
Isn’t this the most perfect job?
…
After finishing the course, Li Mu went directly back to his office.
Although there are no classes, people still have to stay at school.
Of course, his office is quite spacious, and there are several large desks. The configuration is exactly the same as that of other full professors. The only thing that is incompatible with other professors' offices is that there is no student in his office.
However, it will be available after the start of next semester, so there is no need to rush.
He sat down and leaned back on the comfortable office chair.
Li Mu entered his mind.
[The current level of the brain computer is level 4, and the upgrade progress is 45121/100000. 】
Pulling his thoughts out of the depths of his mind, Li Mu narrowed his eyes.
Proving the existence and smoothness of the solution to the Navier-Stokes equation allowed him to complete the previous task, and also allowed him to obtain a huge energy reward.
In addition, there is an opportunity to simulate a real universe environment.
"Level 4 real universe environment simulation opportunity..."
Li Mu remembered the opportunity to extract the underlying operating code of the fourth-level universe previously.
"Now, it can be used."
Without being too entangled, he entered the brain computer again.
"Convert the fourth-level real universe environment simulation into the extraction of the underlying program of the universe."
"Directed Extraction Using Level 4 Universe Underlying Programs."
Then, a panel appeared in my mind: [Please select the direction of directional extraction: practical technology or theoretical knowledge. 】
Li Mu made a choice: "Choose practical technology."
[Please select a specific direction: materials technology, engineering technology, energy technology, structural technology, chemical technology, biotechnology, computer technology...]
The various subdivision directions made it difficult for Li Mu to make a choice for a while.
Which direction should we choose?
"Forget it, point out troops and generals, point out troops and point generals, I will choose whoever I choose...whoever I choose!"
"Well...it's material technology."
Li Mu's brows raised, and then relaxed.
If it's material technology, it's not bad.
The fundamental problem of the difficulty of all technologies in the world lies in materials. As long as the materials are solved, there will be no problem.
For example, in controllable nuclear fusion, the biggest problem in controllable nuclear fusion is materials, such as superconductors, first wall materials, etc. If the first wall material can directly withstand the impact of plasma flow up to hundreds of millions of degrees, then Controlled nuclear fusion can be realized in situ. Similarly, if the superconductor's binding force on these plasma flows can prevent it from damaging the first wall material at all, then controllable nuclear fusion can also be realized in situ.
"So what kind of material technology can I draw this time?"
Li Mu geared up, and then, "Choose material technology."
"The extraction direction has been determined to be practical technology-material technology."
"Start extraction."
The sound of the system rang until a moment later...
"The underlying program of the universe was extracted successfully!"
"Translating into a language that the host can understand..."
Finally, Li Mu realized that there was an extra piece of information in his mind.
[Detailed explanation of superconducting material technology]
Li Mu was stunned immediately.
"Huh? Superconducting... material?"
Is it really just a miracle?
Superconducting Superconducting, what is superconducting?
Simply put, it is a superconductor.
Ordinary conductors will have resistance, so during the power transmission process, there will be current loss, and this lost current will generally be lost in the form of heat energy, just like a mobile phone getting hot, which everyone knows. If you touch it, for example, high-voltage wires will also heat up. This...
Ahem, in short, the key to a superconductor lies in its zero-resistance property, so that there is no current loss during the transmission of current.
Of course, zero resistance is only one of its properties. In addition, superconductors can also provide a very strong magnetic field, which is called complete diamagnetism, and is also called the Meissner effect.
This kind of material can be regarded as the crown jewel of materials science. Its status is like the status of Goldbach's conjecture in the world of mathematics - no, more strictly speaking, it should be the status of Riemann's conjecture in the world of mathematics.
With zero resistance and the Meissner effect, superconductors can be used in a wide range of fields. They are currently used in nuclear magnetic resonance in hospitals and large particle colliders. The powerful magnetic field provided by superconductors is used to accelerate particles.
And ideally, there are even more applications, such as replacing the current high-voltage power transmission, or using it as energy storage equipment, etc. Once these are used, they will have huge significance for people's livelihood, not to mention the need for It is said to be helpful to research on controllable nuclear fusion.
Unfortunately, this is only an ideal.
In fact, because the high-temperature superconductors that have been developed so far do not have good plasticity, they are not widely used. Low-temperature superconductors require expensive liquid helium to maintain the superconducting state, which is very costly.
Therefore, if an accident occurs in the MRI room in a hospital, the losses will be huge.
Li Mu narrowed his eyes.
"So, what will the superconducting technology developed by this level 4 brain computer look like?"
Without much hesitation, he started looking directly.
Then, he became surprised.
The detailed technical explanations here were completely explained to him, including BCS theory, high-temperature superconductivity theory, and even...
The fundamental principle of superconductivity!
For now, the only complete theories about superconductivity are the BCS theory and the GL theory. The GL theory does not explain the existence of superconductivity in detail, but it foresees the second type of superconductor, while the BCS theory A good microscopic explanation of Type 1 superconductors.
But no matter what, the explanation for Type 2 superconductors and the explanation for high-temperature superconductors have not yet been fully solved.
But now, in this detailed technical explanation, all this knowledge and content is included.
Li Mu was almost completely undistracted and immersed all his thoughts in this information, completely understanding it from beginning to end.
Until finally, he opened his eyes, his eyes showing satisfaction and a little regret.
"Unfortunately, this information does not fully explain the root cause of superconductivity."
But soon, his eyes showed some shock.
"But...according to some of the theories given there, the most fundamental cause of superconductivity actually comes from...dimensional force!"
After reading this information, what shocked Li Mu the most was this. Dimensional force actually played a role in this.
"Just like in the BCS theory, Cooper pairs are the main reason for the formation of the principle of superconductivity, and dimensional forces also play a role in the formation of Cooper pairs."
"In high-temperature superconductors, although Cooper pairs cannot be formed between electrons due to temperature reasons, due to a special mechanism, dimensional forces play a role in it, and ultimately the movement of electrons loses resistance..."
Li Mu was amazed in his heart.
Dimensional force will play a role. Although it is unexpected, it is also reasonable. As a basic force of fundamental forces, dimensional force should indeed play a role in this physical phenomenon. However, what I did not expect is that it will play a role in superconductivity. plays such a huge role in it.
"So, although this technical information does not fully explain the fundamental principles of superconductivity - it is probably because the level of the brain computer is not enough to give a complete explanation."
"But based on the current situation, it seems that it must be related to dimensional force."
Moreover, Li Mu had a hunch that in this deeper place, more profound principles related to dimensional force would be revealed.
"It seems that we can start research in this area in the next period of time."
Explaining the fundamental theory of superconductivity is a goal shared by countless scientists around the world.
Just like condensed matter, a major branch of physics, the most important research direction is superconductivity.
At this moment, the system's sound rang.
"The task of upgrading the computing power level is announced——"
【Superconducting! Superconducting! 】
[Task introduction: Have you ever thought about why this universe designed a superconductor, a material that is perfect in terms of properties and functions? 】
[Task purpose: explain the theory of superconductivity. 】
Looking at the interrogative tone in the new mission introduction, Li Mu fell silent for a moment.
Yes, why did this universe "design" materials like superconductors?
In other words, why are materials “designed” to have superconducting properties?
Let a conductor, at a certain temperature node, or at a certain atmospheric pressure, have its resistance drop like a cliff and become zero?
At this moment, Li Mu had to feel miraculous about this phenomenon again.
Perhaps Kamerlin Onnes, who was the first to discover superconductivity, had this experience best.
Take all your thoughts away from the wonder of the mystery of the universe.
"Although the world is magical, as humans, we still have to return to reality."
Li Mu sighed slightly, just like he sometimes thinks, if there are really aliens in this universe, what is that alien doing on a living planet hundreds of thousands of light years away?
But after the daydream is over, you still have to do what you should do now.
To some extent, this is unfreedom.
"Then I'm going to try to achieve this freedom."
"Then the first thing to do is to explain the principle of superconductivity."
Li Mu was certain.
"But before that, we have to give the mathematical world a little Millennium Problem shock."
…
(End of chapter)
