Even if you can learn physics, it is very admirable to be able to learn physics in such depth.

At the same time, I can also study physics and mathematics textbooks in foreign languages, which can only be praised by the big guys.

Suddenly, she came back to her senses, wait, variational inequality?

This mathematical method has also been used in economics and finance, and she, a student of finance, has recently been learning the content of variational inequalities, and has even encountered learning problems.

She opened her mouth and finally whispered, "Classmate, classmate?" ”

Seeing that Li Mu didn't react, she sighed, so she had to reach out and pat Li Mu's shoulder.

Li Muzheng's typing hand stopped, suddenly came back to his senses, and turned his head to look at the person who patted him.

With his current memory, he recognized this girl almost immediately.

Then he realized that he had forgotten the time again.

"Ah...... Excuse me, I'll leave now. ”

A skillful Ctrl+S, Alt+F4 closes the interface, and then closes the computer directly.

"No, no, classmate, I just want to ask you, do you know how to change inequalities?"

Yun Rongshang hurriedly asked.

"Variational inequality? Oh, I will. ”

Li Mu nodded, of course this will, although the variational inequality is also a big knowledge point, but he knows a lot.

Otherwise, I wouldn't have written a paper about it.

"Shall I ask you a question?"

As he spoke, Yun Rongshang took out a small notepad from his pocket, flipped through it, and finally turned to a page, and then handed it to Li Mu.

"I've been thinking about this question for a long time today, and I can't write it."

Ask a question?

Li Mu was stunned, then nodded and took the small notepad.

"Let me be well."

The small notepad is very small, but the girl's handwriting is also very delicate, and she just wrote an inscription into it.

This is a problem in the economic sphere, or more simply, a problem of optimization.

Variational inequality is a mathematical method used in the field of economics to find the optimal solution or equilibrium state.

And this problem is mainly about solving the variational inequality.

After thinking for a while, Li Mu brought the scratch paper from the side, and then began to write.

"This problem is indeed more difficult in variational inequalities, and the most critical point is how to connect these groups of variational inequalities."

As he spoke, Li Mu began to write.

"By treating each variational inequality in a simultaneous variational inequality problem as a variational inequality problem with parameters, each variational inequality with parameters can determine an implicit function with parameters as independent variables about its solution under the assumption that each variational function is strictly monotonic, and the continuity of that implicit function can be proved under appropriate conditions......"

"Then use Brouwer's fixed point theorem......"

With Li Mu's narration, the scratch paper was also full of the solutions he gave.

"OK, that's it, this question is not bad, but the strange thing is why the topic is related to the economy."

"You studied economics?"

Li Mu said casually, and at the same time turned his head to look at the girl next to him.

However, Yun Rongshang was already dumbfounded.

Who is she and where is she?

How do you feel like you're listening to a book from heaven?

Is she in heaven?

"Classmates? Schoolmate? ”

Li Mu shouted again, and felt a little strange in his heart.

This girl looks quite delicate, why is she a little stupid?

And Yun Rongshang finally came back to his senses at this time, and asked weakly, "Classmate...... Oh no, senior, can you say it all over again? I...... Didn't understand. ”

At this time, Li Mu had become a senior in his eyes, and maybe he was at the level of a doctor.

"Uh......"

Li Mu was stunned, senior?

He's only a freshman, is there still a big zero in our school?

Forget it, don't care about it for now, and then he will say it carefully to Yun Rongshang again.

For him, lecturing to others is also a review of relevant knowledge points, so he is quite willing to do this kind of thing.

In this way, he spent five or six minutes back and forth to re-explain it to Yun Rongsheng.

And Yun Rongshang has gradually changed from seemingly understanding to mastering seven, seven, eight, eight, and eight, and the rest of the knowledge points need to be comprehended by herself.

"Thank you so much! It's a waste of your time. ”

Holding his small notebook, Yun Rongshang looked at the steps and ideas for solving the problem written on it, and said very gratefully.

Li Mu smiled and waved his hand: "You're welcome, the question is actually quite simple, and it didn't delay me much, just a few seconds...... 咳咳，我的意思是，对于你们学金融经济的，这种问题确实还是稍微有些难的。 ”

Delayed for a few seconds......

Yes...... Are you when I didn't hear?

Yun Rongshang wanted to roll her eyes, but she thought that she had just gotten her own question and began to tell it......

People seem to be telling the truth.

But at this moment, a voice suddenly came: "Xiaoyun, you are here, I see that you haven't come back for a long time, and I thought something was wrong." ”

The two of them turned their heads to look, and saw their library aunt coming.

Yun Rongsheng's face turned red, she asked questions here, and she forgot what she had done.

"Ah, I'm sorry Auntie, I'm here to ask this classmate a question, I'll clean it up now!"

Auntie waved her hand and said, "Forget it, it's so late, you students study hard, let's go back and rest early, I'll clean up." ”

"That's right...... Well, then thank you Auntie. Yun Rongshang noticed that it was almost eleven o'clock, and couldn't help but say gratefully.

Li Mu also noticed the time, so he quickly packed up his things, but he had to get up at six o'clock tomorrow morning, although his sleep quality was good, he also had to maintain six hours of sleep every day.

In this way, he took his schoolbag and didn't talk to the girl, so he quickly walked out of the library, but he didn't take a few steps when a "hey" came from behind.

When I turned my head, I saw that it was the girl just now, who was carrying a schoolbag and followed.

"Thank you for teaching me just now." Yun Rongshang said, "My name is Yun Rongshang. ”

"It's okay, didn't you thank you?" Li Mu waved his hand, indicating that he didn't care, "My name is Li Mu." ”

Yun Rongshang smiled lightly, and then asked curiously, "Actually, I want to ask, are you really from the Department of Physics?" ”

"Then what else." Li Mu spread his hands.

"It feels like you're more like a math department."

Li Mu touched his nose.

Mathematics Department?

Perhaps, he may be more suitable for the mathematics department now, and the computer and mathematics in his mind are simply a natural match.

Physics has become a junior.

However, he still has a piece of land left for physics in his heart, after all, this is his first love.

“对了，你刚才是在写论文吗? SCI？ ”

"yes, you can see that?" Li Mu couldn't help but glance at this girl more.

Yun Rongshang said: "I can't understand it, plus the books you read are so profound, it must be SCI." ”

Li Mu: "......"

It seems to make sense.

But he felt that he took a random textbook on electromagnetism, which was also very advanced for this girl, right?

She didn't understand science things.

At this time, they also came to a crossroads, and Yun Rongshang pointed to a building at the end of a road, "Senior, your dormitory is over there." ”

"Huh?"

Li Mu was stunned for a moment, and glanced at the building that Yun Rongshang pointed to, which was a graduate student dormitory building.

He shook his head, then pointed to another intersection, where the undergraduate men's dormitory was.

"I'm not a senior, unless you're Big Zero, I'm going this way, goodbye."

So saying, he walked to the other side.

Left a stunned Yun Rongsheng.

What?

Not a senior, unless she's Big Zero?

In other words, this is only a freshman?

Younger brother?

You?