"That's it for today's lesson."

"In addition, about the final exam......

Standing on the podium, Li Mu looked at all the students in the lecture hall.

All classes for a semester have ended.

And now there are still so many students who come to his class, almost filling the entire classroom.

There are still quite a few people standing in the corridors.

Originally, according to his estimate, at most, it was the first few classes, because his fame would attract a lot of students to come and join in the fun, and after a while it would become less, but what he didn't expect was that because his class effect was not bad, more and more mathematics students in the school were attracted to his class.

There are even some students from other cities who will come by car from other cities because of his class, just to listen to one of his classes.

All in all, every class he has now is almost equivalent to an open class, and his schedule is almost not spread among mathematics students in the UK.

Of course, as time passes so quickly, this semester's classes are still coming to an end.

And at the end, it is natural that there will be an exam.

It's just that after hearing that the exam was going to be held, only the more than 50 students sitting in the front rows showed panicked expressions among the hundreds of students in the audience.

After all, these students are the real students of Li Mu's number theory class, so they are the only ones who need to face the exam.

Li Mu smiled slightly: "The time of the exam will be placed next week, and the focus of the exam ......"

All of a sudden, the more than fifty students all pricked up their ears and stared at Li Mu's mouth tightly, wanting to know what the focus of the exam would be.

As a result, Li Mu played a trick that all teachers had played: "What I talked about in class is the key point. ”

顿时间那五十多名学生都哀嚎了起来，而另外那200多名跑过来蹭课的学生则纷纷笑了起来，幸好他们只是过来蹭课的，不用考试。

God knows how difficult their questions will be with Professor Li.

Maybe the bottom line is to use some unsolved math problems as the problem stem - who asked Li Mu to use this kind of problem to tell when he was in class?

"Okay, that's the end of this semester's classes, thank you for coming this semester, and for me, I know hundreds of friends my age."

"So, friends, see you next semester. ”

"Class!"

As Li Mu announced the end of class, immediately after, all the students in the audience suddenly stood up in tacit understanding.

"Professor Li, hard work!"

Li Mu smiled and waved his hand, and then began to clean up the lectern and prepare to leave the classroom.

But at this moment, a student suddenly shouted at him: "Professor Li, I heard that you are going to complete the problem about the Neville-Stokes equation in the Seven Problems of Mathematics in the past few years at the International Congress of Mathematicians, is this true?" ”

听到这个问题，李牧一愣，然后抬起头看向了这名学生。

In fact, there were other students who also looked at him.

He couldn't help but smile and shook his head, and said, "I don't know how many people have asked me this question." ”

Wiles, Licht, they asked, Tao Zhexuan asked, and now his own students also asked.

In fact, there are many friends who have known him in China recently, and many people have come to ask him about this matter.

It was as if the whole math community felt that he had completed the proof of the problem, although in fact it was.

The students present all laughed, and the student who asked the question also laughed at this time: "These are the seven major math problems of the millennium!" Of course we all want to know. ”

Li Mu shook his head, and then said with a smile: "On this issue...... You'll just pay attention to my report then. ”

"I'm sure you'll be pleasantly surprised."

The students present looked at each other, but then, their eyes showed anticipation.

Since their Professor Li has said so, there will probably be a surprise?

……

The semester of classes is completely over.

As for the class for next week's exams, there was no need for him, a full professor of mathematics at Merton College and All Souls College, to be the proctor.

Speaking of which, although he is also a full professor of mathematics at All Souls College, since there are no mathematics majors at All Souls College for the time being, there is no need for him to go to class or anything.

Of course, this is mainly because Wanling College does not accept undergraduates but only graduate students, and the number of graduate students recruited is still very rare, so the professors of Wanling College are not so much professors as researchers.

However, for Li Mu, this can be regarded as reducing the burden on him to a certain extent.

Not only can you get paid for nothing, but you don't have to do anything.

Isn't this the perfect job?

……

After finishing the course, Li Mu went straight back to his office.

Although there are no classes, people still have to stay in school.

Of course, his office is also quite large, and there are several large desks, which are exactly the same as the other full professors, the only thing that is incompatible with the other professors' offices is that there is not a single student in his office.

However, after the start of the next semester, there will be one, so there is no need to rush.

Sit down and lean back in your comfy office chair.

Li Mu entered his mind.

[The current level of the mind computer is level 4, and the upgrade progress is 45121/100000.] 】

将思维从脑海的深处抽了出来，李牧眯了眯眼睛。

The proof of the existence and smoothness of the solution to the Neville-Stokes equation allowed him to complete the previous task, and likewise, it also allowed him to receive a huge energy value reward.

In addition, there is also an opportunity to simulate the real cosmic environment.

"Level 4 Realistic Cosmic Environment Simulation Opportunity ......"

Li Mu remembered the opportunity to extract the underlying running code of the fourth-level universe that he had obtained before.

"Now, it's ready to go."

Without getting too much of it, he got back into the computer in his head.

"Convert the fourth-level real cosmic environment simulation for the extraction of the underlying program of the universe."

“使用四级宇宙底层程序定向提取。”

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 direction of various subdivisions made Li Mu a little difficult to choose for a while.

What direction should I choose?

"Forget it, point the generals, point the generals, and I will choose whoever I want...... Who! ”

"Hmm...... It's material technology. ”

Li Mu's eyebrows furrowed, and then stretched.

If it's material technology, it's not bad.

The fundamental problem of the difficulty of all technologies in the world lies in the materials, and as long as the materials are solved, there will be no problems.

For example, controllable nuclear fusion, the biggest problem of controllable nuclear fusion is the material, such as superconductors, and then the first wall material, etc., if the first wall material can directly withstand the impact of up to hundreds of millions of degrees of plasma flow, then controlled nuclear fusion can be achieved in situ, in the same way, if the superconductor binding force on these plasma flows can make it completely undamaged to the first wall material, then controlled nuclear fusion can also be achieved in situ.

"So what kind of material technology can I draw this time?"

Li Mu rubbed his hands, and then, "Choose material technology." ”

"The direction of extraction has been determined to be practical science and technology - material technology."

"Start extracting."

The sound of the system rang out until a moment later......

"The underlying program of the universe has been extracted successfully!"

"Translation into a language that the host can understand......"

In the end, Li Mu realized that there was an extra piece of information in his mind.

【超导材料技术详解】

李牧顿时就愣住了。

"Huh? Superconducting...... Material? ”

Is it really a miracle?

SuperconductivitySuperconductivity, what is superconductivity?

In simple terms, it is also a superconductor.

Ordinary conductors will have resistance, so in the process of power transmission, there will be current loss, and these lost currents will generally be lost in the form of thermal energy, just like a hot mobile phone, which everyone has touched, and then for example, high-voltage wires will also heat up, this ......

Ahem, in short, the key to superconductors is their zero resistance nature, so that there is no current loss in the process of transmitting current.

当然零电阻也只是其中的一个性质，此外，超导体还能够提供十分强大的磁场，这也就被称之为完全抗磁性，同时也叫迈斯纳效应。

Such a material can be called the crown jewel of materials science, and its status is like the status of Goldbach's conjecture in the mathematical community—no, to be more rigorous, it should be the status of the Riemann conjecture in the mathematical community.

With zero resistance and the Meissner effect, superconductors can be used in a wide range of fields, such as nuclear magnetic resonance in hospitals, and large particle colliders, which also use the strong magnetic field provided by superconductors to accelerate particles.

而理想之中所能够运用的范围，就更多了，比如取代现在的高压输电，再比如用作储能设备等等，这些一旦运用起来，对于民生来说都有着巨大的意义，就更不用说是对可控核聚变研究的帮助了。

Unfortunately, this is only ideal.

In fact, because the current high-temperature superconductors that have been studied are not good in plasticity, the scope of application is not wide, and low-temperature superconductors need expensive liquid helium to maintain the superconducting state, which is very costly.

所以像医院之中，核磁共振室一旦发生意外，损失就会十分巨大。

Li Mu narrowed his eyes.

"So, what would this superconducting technology look like with a Level 4 brain computer?"

Without much hesitation, he looked straight ahead.

Then he was amazed.

The detailed explanation of the technology in this completely explained to him, the BCS theory, the theory of high-temperature superconductivity, and even ......

超导的最根本原理！

At present, there are only two complete theories of superconductivity, the BCS theory and the GL theory, and the GL theory does not explain the existence of superconductivity in detail, but it does foresee the type 2 superconductor, and the BCS theory explains the type 1 superconductor very well at the microscopic level.

但不管如何，针对第2类超导体的解释，以及针对高温超导体的解释，至今都完全没有全部解决。

And now, in this detailed explanation of technology, this knowledge and content is all included.

Li Mu was almost completely distracted, immersed all his thoughts in this information, and understood it completely from beginning to end.

Until finally, he opened his eyes, and his gaze revealed satisfaction, as well as a little regret.

"Unfortunately, this information does not fully explain the root cause of superconductivity."

但很快的，他的眼睛之中又露出了一些震撼。

"But...... According to some of the theories given in it, the most fundamental cause of superconductivity actually comes from ...... Dimensional Force! ”

After reading this information, what shocked Li Mu the most was this, and the dimensional power actually played a role in this.

"Just like in the BCS theory, Cooper pairs are the main reason for the formation of the superconductivity principle, which leads to the formation of Cooper pairs, and dimensional forces also play a role in it."

"In high-temperature superconductors, although Cooper pairs cannot be formed between electrons and electrons due to temperature, due to a special mechanism, the dimensional force plays a role in it, and finally the movement of electrons loses its resistance......"

Li Mu was amazed in his heart.

As the basic force of fundamental forces, dimensional forces should indeed play a role in this physical phenomenon, but what I did not expect is that they will play such a huge role in superconductivity.

"So, although the fundamentals of superconductivity are not fully explained in this technical document, it is probably because the level of the computer in the mind is not enough to give a complete explanation."

"But as it stands, it must have something to do with dimensional forces."

Moreover, Li Mu had a hunch that in this deeper depth, more profound principles related to dimensional forces would be revealed.

"In this way, in the next period of time, we can start researching this."

解释超导的根本理论，是全世界不知道多少科学家共同的目标。

Just like condensed matter, a major branch of physics, one of the most important research directions is superconductivity.

At this moment, the voice of the system rang out.

"Computing power level upgrade task promulgated——"

[Superconductivity! Superconducting! 】

[Description: Have you ever wondered why this universe has designed superconductors, which are perfect materials in terms of properties and functions?] 】

[Purpose: To explain the theory of superconductivity.] 】

Looking at the questioning tone in the introduction of this new task, Li Mu was slightly silent.

Yes, why did the universe "design" superconductors as a material?

In other words, why are superconducting properties "designed" for materials?

Let the resistance of a conductor drop like a cliff at a certain temperature node, or at a certain atmospheric pressure, to zero?

At this moment, Li Mu had to feel amazing for this phenomenon again.

Perhaps, Camerin Onnes, who was the first to discover superconductivity, could have this experience the most.

Take all your thoughts back from the wonder of the mystery of the universe.

"Although the world is amazing, as a human being, we still have to return to reality."

Li Mu sighed slightly, as if he sometimes thought, if there are really aliens in this universe, then what is that alien doing on a living planet hundreds of thousands of light years away?

It's just that after the reverie is over, I still have to do what I have to do now.

In a way, this is a form of unfreedom.

"Then I'm going to try to achieve that freedom."

"Then the first thing to do is to explain the principle of superconductivity first."

Li Mu must be in his heart.

"But before we do that, we've got to rock the math community a little millennial conundrum."

……

(End of chapter)