Located near Tsinghua University, this Internet café called Qingglaze.

Cheng Nuo took out the last book of "History of Modern Mathematics" in his school bag, and then put on a headset, turned on the computer, and created an ORD document under the bewildered eyes of several chicken players next to him.

"Pretreatment Method for Joint Compact Difference Separation Equations of Two-Dimensional Helmholtz Equations"

Cheng Nuo typed the title of the topic on it.

Rub your hands, move your fingers, and twist your neck. Cheng Nuo was doing warm-up exercises.

On the left-hand side, there is a whole stack of seven or eight reference materials.

On the right-hand side, there is scratch paper, gel pen, ruler, eraser......

Everything is ready, just start work!

Cheng Nuo didn't waste the slightest time, according to his plan. For a full day today, he intends to complete at least 20 percent of the tasks he is responsible for.

I have to go to class after the 11th holiday, and things will get busier and busier. There is not much time left for Cheng Nuo!

clicked on the song "Where are the top students", accompanied by the dynamic music from the headset, Cheng Nuo began his project work.

"There was one guy in our class who was cool. Scholars are in charge, who dares to stand in the way. ”

"The top students are always reading books, and they even have to run to the toilet. ”

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

"Xueba, Xueba, where are we going?

"Scum, scum, don't look at it anymore! I can't remember it after reading it!"

Cheng Nuo hummed the lyrics in his mouth while his hands crackled on the keyboard.

To derive the two-dimensional Helmholtz equation from the discrete one-dimensional Helmholtz equation in CCD format, we must first figure out what the one-dimensional Helmholtz equation looks like for this handsome little girl.

More than a year ago, there was a project dedicated to the sixth-order compact differential method of the one-dimensional Helmholtz.

So for some things about the one-dimensional Helmholtz equation, Cheng Nuo can directly draw on that topic paper.

First, the one-dimensional Helmholtz equation for the Dirichlet boundary condition is considered.

f''(x)+k^2f(x)=g(x)，x∈Ω=(0，1)

f(x)=0∈αΩ

k denotes the number of waves.

Next, divide the definition field into ......

Cheng Nuo's brain was racing.

The seven or eight books on Cheng Nuo's left hand side were also turned back and forth by Cheng Nuo, looking for the information he needed.

And the stack of scratch paper on the right hand, usually, Cheng Nuo basically doesn't use this thing.

Because, whether it is the college entrance examination or the questions in the classroom of the mathematics teacher, they are too simple, and it is not worth Cheng Nuo to use "scratch paper", which is a treasure at the bottom of the box.

But that's no longer the case.

In just one morning, Cheng Nuo has used more than ten pieces of scratch paper.

Every piece of scratch paper is full of formulas that make ordinary people think of ghost drawings.

The progress of the project is also developing in a gratifying direction.

Although Cheng Nuo's brain domain is wider than that of ordinary people, it has not yet gotten rid of the level of people.

Cheng Nuo is only a freshman, so this time, Cheng Nuo did not get the task as usual, but he did it easily with the attitude of urging decay.

With the support of the brain's powerful computing power, Cheng Nuo can't be called hard, but it's not easy.

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

Inside the blue glaze Internet café.

Cheng Nuo's existence, which is like a clear stream, still attracted the attention of many people in the Internet café.

Because the location where Cheng Nuo was sitting was in the Internet café near the door. So whenever a new customer comes to the door and walks on the other side of Chengnuo, he will notice: a teenager who is not in a young grade is writing and drawing while quickly flipping through a book. His hands were still frowning and thinking at times, and sometimes he was smiling.

From time to time, he laughed, "Wow Ka Ka, I should have used this formula, I was so frustrated!"

？？？

Could it be me...... Went to the wrong place.

The customer who wanted to eat the chicken looked confused.

Of course, some people are curious, and deliberately walked behind Cheng Nuo to see what Cheng Nuo was doing.

As a result, when I saw the dense and complex formulas on Cheng Nuo's computer......

Big guy!

RBQ, RBQ!

Farewell, don't send it!

Under Cheng Nuo's aura of being a scholar, the scumbag automatically retreats!

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

At noon, Cheng Nuo was too lazy to go back to the dormitory, so he directly ordered a takeout.

"Dude, watch me for a while, I'll go down and get takeout. Cheng Nuo patted the shoulder of the buddy sitting next to him and said with a smile.

The guy sitting next to Cheng Nuo was a lean man with glasses and a sallow face.

looks like a "friend" who has been playing for more than five years.

That guy has been playing chicken all morning, and he has completed a game of eating chicken into a parachuting game.

"No problem. Xuebul boss!" The young man made an OK gesture to Cheng Nuo, then touched his stomach and muttered to himself, "I'm a little hungry." ”

When Cheng Nuo came back with takeout, he saw that the guy was sucking instant noodles and eating them fragrantly.

Cheng Nuo sat next to the buddy, turned his head and said bitterly to the young man, "Dude, this paper bowl for instant noodles is unhealthy." Belch...... I listened to an expert. ”

The young man smiled, sucking on the instant noodles, and finally slurred, "Health? Hehe, does that expert know instant noodles, I'm so mixed up eating instant noodles, and I still care about health!"

Cheng Nuo couldn't refute the young man's words.

"Don't say it, don't say it, eat, eat. ”

Cheng Nuo rubbed his hands and opened the takeaway bag with his saliva.

Inside...... It's a bucket of fragrant instant noodles.

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

"The discrete one-dimensional Helmholtz equation in CCD format gives the following: Af:=...... (ㄒoㄒ)/┏(゜ロ゜;) ┛......”

Crackling, crackling~~

Throughout the Internet café, the sound of rhythmic fingers tapping on the keyboard sounded.

It's just that some people are playing, and some people are learning.

“f=[f1，f2...... fN]^T，f'......”

"Whew, it's finally done!"

At seven o'clock in the evening, Cheng Nuo figured out the one-dimensional Helmholtz equation in CCD format. It's a great sense of accomplishment!

I was going to spend two days to get the one-dimensional one out, but I didn't expect that the state was good, and the time was directly shortened by half.

So tomorrow, you can start exporting 2D.

Night had already fallen, and the streets outside were already brightly lit.

Cheng Nuocai remembered that he was too involved in what he wrote, and he hadn't eaten dinner yet.

Stretching his waist, Cheng Nuo took off the headset. As soon as he looked up, Cheng Nuo found that almost everyone in the Internet café did not play with the computer, but raised their heads one by one and looked at the big screen in the Internet café.

And what is playing on the big screen is the finals of the LPL Professional League.

EDG V RNG。

Score, 1:2.

Occupy an absolute advantage.

The five-man highland perfect regiment, destroy the enemy's four, push the highland, and break the front teeth.

Bang——!

When the blue crystal shattered, the narrator roared in the loudest voice: "Let's ......"

"Congratulations RNG!"

The entire Internet café is boiling.

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

PS: Congratulations to RNG for winning the 2018 LPL Spring Festival Championship!

Congratulations to UZI for winning the Spring Playoffs MVP!