I Don’t Want to Win Lying Down

Xu Mang didn't want to make trouble in Columbia University. The reason why he ran into other people's classrooms was to see if Columbia University, which has positioned the physics major as one of the most outstanding majors, has any advanced teaching aspects, and copy it if there is one. come over.

There is no way... It is better to cross the river by feeling the eagle sauce than crossing the river by feeling the stones.

But to Xu Mang's regret, he didn't get any new feeling. He basically read it according to the textbook, and then analyzed it according to a certain classic example. It's pretty much the same as what I usually teach.

Xu Mang felt very regretful about this. He should go to the library to see the occupancy rate of the library. Through the analysis of the occupancy rate, he could basically judge the teaching quality of this school.

so awkward...

Sitting like this is boring.

Xu Mang was about to die sitting there. He was currently teaching the calculation and approximation methods of quantum mechanics. In fact, these things were just like that. The main reason was that he had reached the point where he knew everything well... It was meaningless to listen to these things again.

The motion of molecules is more complicated than that of atoms.

Molecules involve not only the movement of electrons, but also the movement of atomic nuclei. In the center-of-mass coordinate system, each atomic nucleus in the molecule makes small vibrations near its equilibrium position. According to the pictures projected by the projector, the professor talked to the students in the audience Explain the vibration and rotation of molecules.

At this time,

The professor suddenly noticed that one of the more than forty students was in a daze. The most important thing was that he didn't even bring a notepad, so he just sat there in a daze.

Although many students in universities are mainly self-study. In their spare time, they either stay in the dormitory to read books, or stay in the library to read books, or conduct research in the laboratory, but the most basic etiquette must be met in class.

No textbooks, no notebooks, no pens... What class are you here for?

Ahem!

Pay attention to this classmate. The professor looked at Xu Mang and said seriously, If you don't bring anything with you next time, then you won't use it for my class.

The sudden reminder was hard to guard against. Xu Mang was still in a deep fantasy, but was awakened by the professor. Confused and at a loss, Xu Mang nodded. In fact, his behavior was just subconscious.

class continues,

It didn't stop because of this little incident.

Hey!

Sister! Xu Mang silently approached the blond woman beside him, and said with a smile, Can I share your textbook?

No problem. The blond woman agreed to Xu Mang's request.

This sister looks very ordinary, with blond hair and blue eyes, and that's the end... But to Xu Mang, it seems that foreign women are like this, unless they are special Hollywood movie stars, it is difficult for Xu Mang to distinguish foreign women. female appearance.

Why haven't I seen you before? Are you here to listen? The blond girl looked at Xu Mang curiously. There was no oriental face in this class, and it was easy to find out that there was an extra one for no reason.

ah?

Yes... I'm an observer. Xu Mang nodded.

Astronomy majors? The blond woman asked, Usually, astronomy majors will come to attend lectures, but you may have come by mistake. The theory of relativity is only available on Thursdays and Fridays.

oh...

It's okay! Xu Mang said with a smile, I'm very studious.

In the following time,

Xu Mang chatted with the blond woman about some interesting things about humanities, but the voices of the two were so small that they could only hear each other. During the chat, the blond woman felt very good about Xu Mang, and then she actually proposed Go to the coffee shop after class.

joke,

Xu Mang didn't dare to agree to this request. Otherwise, he might have to sleep on the sofa for the rest of his life.

And... I didn't find anything special about this blonde woman. Compared with Audrey Hepburn, she was far behind.

sorry.

I'm married. Xu Mang secretly took out his phone and unlocked the screen. On the phone screen was a photo of him and Xiao Man. From the smiles on the photo, we could see that the word happiness was printed on each other's faces.

...

Sorry. The blond woman was a little embarrassed, and said to Xu Mang, I didn't know you were married.

Seeing the disappointed face of the blond woman, Xu Mang sighed helplessly, and said calmly, It's not your fault, it's my fault. I deliberately concealed my marriage. If I got married When word gets out, single women all over the world will cry for me.

I...

this...

The blond woman's face was full of confusion, and her expression gradually became a little lost.

Casey!

With the structure of carbon dioxide O=C=O, a straight line of molecules, assuming that the equilibrium distance between two adjacent atoms is a, the elastic force coefficient of two adjacent atoms is k, what is the Hamiltonian? You can write it up expression.

The professor suddenly asked the confused blond woman.

The sudden question made the girl even more confused. She had been chatting with Xu Mang just now, and then missed a period of time and space. When she came back to her senses, she found that the world had changed. Why did she suddenly feel the vibration of the three-atom linear molecule?

Oops,

totally no idea.

The blond girl was a little frustrated, and even a little scared at the moment, fearing that her credits would be affected.

At this time,

Xu Mang took a pen silently, and wrote down an equation in a notepad, which is the general form of the Hamiltonian, but changed according to the structure of carbon dioxide.

finish writing,

Xu Mang pointed to the above equation.

After seeing the equation written by Xu Mang, the blond girl from Casey was a little at a loss. She didn't believe that an astronomy student could give an answer to such a professional physics problem. It must be unreliable.

But right now I have no other choice...

finally,

The blond girl could only walk slowly to the front of the podium according to the equation given by Xu Mang. This short ten-second journey was a century long in Casey's spiritual world.

The professor didn't think Kathy could write this equation, and the reason why she was allowed to take the stage was just to give her a warning, warning her not to do something that had nothing to do with the class during the class, such as staring at the boy.

in panic,

Casey wrote down an equation that Xu Mang gave her, looked at the professor cautiously, and said, Professor...that's it.

...

she will?

Impossible!

Have already previewed this part in advance?

When the professor saw that Casey had actually written out the equation without any mistakes, he was a little confused for a moment.

good!

It seems that you have previewed the approximate method of quantum mechanics in advance. The professor could only praise Casey along the words: Go back.

ah?

That's... that's right?

No way?

Hearing what the professor said, the girl, Casey, realized that the guy sitting in her seat was, yes... that guy who was extremely narcissistic. He had a little deep understanding of physics, and felt that he didn't have much class, even There are no books.

Come confused,

go confused,

Casey still can't figure out why that boy can know this equation, and he doesn't look like a schoolmaster.

Back in his seat, Casey took a serious look at Xu Mang. This man with an oriental face looked a little...cute. With a little nasty.

look familiar!

Looks familiar... I've vaguely seen him somewhere, but I just can't remember who he is.

Who the hell are you? Casey asked.

I am me...a different fireworks. Xu Mang smiled and said calmly.

Neuropathy!

Casey directly defined Xu Mang as a neuropathy, and he was seriously ill, but...he also suffered a lot of harm because of it. If he didn't know about a problem that he knew about neuropathy, he would be worse than a neuropathy.

The class was still going on, but Xu Mang couldn't stand the sleepy mind anymore. body.

Xu Mang fell asleep sitting up.

Very fragrant, deep and beautiful...

Physical skill +1

Physical skill +1

When using the variational principle to deal with practical problems, another common method is to approximate the general form of the wave function, and then use the variational principle to obtain the corresponding energy proof equation. The professor said seriously: This equation It is much easier than the original wave equation, and in the process of solving it...

In the middle of the conversation,

The professor saw a speechless scene where a student fell asleep sitting up.

but...

At this time, the professor suddenly felt that the sleeping student looked familiar.

correct!

He is Xu Mang, right?

The professor finally remembered who the sleeping young man was, and had seen his photos several times in the journals of Nature.

By the way, why did he appear here?

oh!

A recent press conference.

Hello!

Don't go to sleep! Casey hurriedly pushed Xu Mang beside him, and said seriously, What's the matter with you? Are you crazy? This is Professor Jeff's quantum mechanics class, don't you want to be in school? Do you want to stay?

Xu Mang woke up with a cute expression on his face. He felt that the two decisions he regretted the most in his life, one was to marry Xiaoman as his wife, and the other was to come to this classroom to attend lectures. This professor named Jeff, There is no tension in the words, a little lifeless.

This classmate!

The professor pointed to Xu Mang, and said with a serious face, Can you use other methods to solve the problem of multiple electrons in independent particles?

I...

Nima!

what's the situation?

Xu Mang was in a daze, and then his name was called. For a moment, he was a little panicked, feeling like he was back in high school when he was called by the teacher suddenly, and then silently walked out of the classroom to punish him.

At this time,

All the students looked at Xu Mang and expressed deep sympathy for him. This guy must be too unlucky.

By the way...

Who is this guy?

Why have I never seen it before? When did he sneak in?

wrong,

A little familiar!

Almost everyone thought Xu Mang was very familiar, but they couldn't remember who he was. Later, when they thought about it... maybe all oriental people have the same face.

This is the same as Xu Mang's feeling that the faces of Westerners look the same. The two sides have entered into the effect of the native race and the foreign race. The faces of the native race are always easier to recognize than the unfamiliar faces of the foreign race, and the recognition of the face of the foreign race is easier. difficulty.

certainly,

There are also cross-cultural differences in face and expression recognition.

This classmate! The professor said again: Come up and solve this problem, don't make us wait any longer.

Xu Mang shrank his neck, and asked cautiously, Professor...can you repeat the question again?

Use other methods to solve the problem of multiple electrons in independent particles. The professor said: And prove the physical meaning.

Hearing what the professor said,

Everyone was stunned. If the front is a difficult question, then the latter is a death question.

Also to prove the physical meaning...

How could it be possible.

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