Do you think Xueba is really happy?

Yes, you can't imagine the joy of being a top student!

——— excerpt from "Cheng Nuo's Quotations"

............

On the seventh day of the National Day, college students returned to school one after another.

On the campus of Tsinghua University, the vitality and vitality of the past have been restored.

Cheng Nuo continued to carry a stack of books, came to the original location of the green glaze Internet café early, and started the day's work.

Tired is tired, bitter is bitter.

But, the feeling of pretending to be forced is really ...... It's so cool!

Yesterday, Cheng Nuo had already constructed the discrete one-dimensional Helmholtz equation in CCD format.

Next, there is the more complex and difficult stage of deriving from one dimension to two dimensions.

Cheng Nuo sat in front of the computer, frowning, turning the pen while constantly exploring the steps of the solution in his mind.

Huge data streams, constantly converging and colliding in the mind.

After sitting for more than half an hour......

"There it is!"

Cheng Nuo immediately straightened up, tapped the keyboard with ten fingers, and wrote down his inspiration.

"From one dimension to two dimensions, that is, a single x-axis coordinate is converted into x,y plane coordinates. Then, after constructing the two-dimensional Helmholtz equation of the Dirichlet boundary condition, the defined domain is divided into an equidistant network to obtain N^2 grid points......"

“（xi，yi)=（（i-1h，（j-1)h)，............”

In my head, thoughts are flying.

This question is like a woman who is shy to be, as long as she unfastens her first button, the rest will be done!

Papapapa~~

Cheng Nuo used his hands to conquer her.

My forehead was covered with sweat at some point. But Cheng Nuo didn't mean to stop, and he was still ......

Bang Bang Bang!

This is the sound of fingers tapping on the keyboard.

............

In the evening.

Cheng Nuo burst his liver in the Internet café for another whole day before dragging his tired body back to the bedroom.

Academic this thing, Ouhuang and krypton gold will not work.

Only bursting the liver is the king!

I don't know so many academic experts in ancient and modern times, both at home and abroad, and they all have gray hair early.

burst his liver for two days in a row, and Cheng Nuo, an ordinary person, was about to lose his body.

After returning to the dormitory and drinking a bottle of kidney treasure, Cheng Nuo climbed into bed, closed his eyes, and recuperated.

Classes will resume tomorrow, and Cheng Nuo must adjust his state and devote himself to the great and arduous cause of learning with full enthusiasm.

As for the topic......

Cheng Nuo will also find time to continue to study.

After two days of liver explosion, Cheng Nuo has completed about 50% of the content of the first part of the project he is responsible for.

The rest, it is estimated that it will take more than a week to get it.

............

The next day, Cheng Nuo sat in the classroom, bored, and stopped a middle-aged professor on the podium talking about the content of "Advanced Mathematics".

Advanced Mathematics is one of the few public courses taken in the first semester of their finance department.

This course is not the easiest of all the math courses in college, but it is the most basic course.

Almost all engineering majors have to take this course.

As mentioned before, this course has been rumored in the rivers and lakes for a long time. Everyone heard about it.

But for Cheng Nuo......

So easy！

Cheng Nuo, who has already listened to the professional courses of the Department of Mathematics, is really not interested in pediatrics such as high mathematics.

It seems that he should discuss with the instructor whether he can take advanced math courses in the future.

Anyway, he can learn the knowledge of "Advanced Mathematics" in "Mathematical Analysis".

Advanced mathematics includes: limit theory (but not basic proofs), unary differentiation and integration, arc differentiation, multivariate differentiation and integration, elementary ordinary differential equations, series, spatial analytic geometry, vector algebra, etc.

Mathematical analysis includes: theory of real numbers, limit theory (from three perspectives, Dedekind division, interval set, sequence illustrates how rational numbers expand to real numbers), limit theory (including basic proofs, such as Cauchy's convergence theorem), unary differentiation and integration, multivariate differentiation and integration, series, etc.

The content is pretty much the same.

However, one is to focus on calculations, and the other is to focus on theoretical proof. And the depth of mathematical analysis is even deeper.

Cheng Nuo, who was really bored, yawned, put on headphones, and listened to music while continuing to fill in the calculation formulas and steps on the topic on the scratch paper.

The senior math teacher, who was lecturing on the podium, naturally took Cheng Nuo's actions into his eyes.

He stepped off the podium, moved to Cheng Nuo's side, and tapped lightly on his desk.

Knock knock!

Cheng Nuo turned his head and was taken aback by the high math teacher standing beside him. He shuddered and took off his headphones.

"What's your name?"

Cheng ...... Cheng Nuo. ”

"Okay, Cheng Nuo, in view of your behavior of not listening carefully in class, I will give you thirty seconds to make the question on the podium. ”

Cheng Nuo looked up at the blackboard.

Sure enough, at the top of the blackboard was written a question:

"Let the polar equation of the curve C be r=a(sinθ/3)^3, and find the full length of the curve C?"

Cheng Nuo frowned slightly.

Teacher, is the purpose of this question to insult IQ?

Seeing Cheng Nuo's frowning appearance, the high math teacher thought that Cheng Nuo was afraid, and continued to speak, "I don't embarrass you, I just want the result, don't calculate the steps." Timing below, open ......"

“3/2aπ。 ”

High math teacher: "???"

Before the word "beginning" of the high math teacher was spoken, Cheng Nuo was forced to stop the mouth.

Such a speed!

To be honest, Cheng Nuo's answering speed was unexpected by the high math teacher.

Although the question is simple, it takes at least three seconds for him to do it himself.

But Cheng Nuo, this man, only took less than a second!

Terrifying!

The high math teacher had to be impressed with Cheng Nuo.

......

"Bell bell bell ......"

The bell rings for the end of class.

Cheng Nuo was packing his schoolbag while looking at the class schedule of the mathematics department this afternoon.

There is a section of the high generation in the fifth and sixth verses, and there is a section of the seventh and eighth verses to solve the few.

Hey, tragedy is like me, it's another full day of lessons.

When Cheng Nuo was taking pity on himself, a graceful figure appeared in front of Cheng Nuo.

"Cheng Nuo, can I discuss something with you?"

It was Yan Yunqing who spoke.

Oh, by the way, it's the current leader of Cheng Nuo's class. The number one chair of the class committee!

"Yes, please. ”

chatting with beautiful women, Cheng Nuo is very happy.

Yan Yunqing had a capable demeanor, "That's right." The Mid-Autumn Festival is coming soon. Our college is preparing to hold a Mid-Autumn Festival party. The requirement is that each class must register for two programs. ”

"I can apply for a show here, but there is still one missing. Cheng Nuo, I heard that you sing well. Why don't you sign up for a show too?"

Mid-Autumn Festival party?

Cheng Nuo really didn't know the news of the Mid-Autumn Festival party.

"Me?" Cheng Nuo pointed to himself.

"That's right!" Yan Yunqing nodded with a smile, "Cheng Nuo, as a member of the class committee, you should play an exemplary role." Only in this way will your image among your classmates become taller. ”

"Besides, there is also a reward for participating in this party?" Yan Yunqing smiled mysteriously.

Cheng Nuo's eyes lit up, "Reward? Is it a credit?"

Yan Yunqing shook his head with a smile and raised a finger, "No, it's a bag of moon cakes." ”

Cheng Nuo: "......"

In the end, under Yan Yunqing's persuasion, Cheng Nuo finally agreed to perform on stage. However, there are conditions.

"However, I needed an instrument to accompany me on stage. Make the show perfect. If you can borrow it for me, I'll say yes. ”

Yan Yunqing spoke, "No problem, let's say, what kind of musical instrument is it, I'll go to the senior sister to borrow it." ”

Cheng Nuo spit out two words lightly: "Erhu." ”