Omnipotent Data

"Solution of a Class of Linear Stochastic Differential Equations"?

Cheng Nuo clicked on the document sent by Wang Genji and began to study it carefully.

The solution of a class of linear stochastic equations has already been learned in the freshman course of the Department of Mathematics.

If Cheng Nuo remembered correctly, for differential equations, the constant variation method should be used to solve them.

This is the most commonly used and recognized as a relatively simple method for solving differential equations.

The constant variable method, in simple terms, first seeks the solution of the homogeneous differential equation corresponding to the differential equation, and then changes the constant to obtain the explicit solution of the equation.

For example, the stochastic differential equation d￡=f(t)￡dt+c(t)db, first rewrite the equation as d￡-f(l)￡dl=c(t)db, and its corresponding homogeneous linear stochastic differential The equation is... and then imitating the appropriate factor method in the ordinary differential equation,... Finally, ￡=...

Here comes the point!

In this paper by Wang Genji, in addition to the constant variation method, another solution method for a class of linear stochastic equations is proposed.

Another solution that's easier than the constant variation method we've been using.

It can be said that if this solution is really proven to be practical, it will definitely cause a small-scale shock in the field of differentiation.

Not to mention SCI's mathematics area 2 journals, even the top journals in mathematics area 1 will definitely pay attention to Wang Genji's paper.

But, unfortunately.

The review editor of the journal pointed out that Wang Genji's paper had major logical errors.

Whether his solution is really practical is still in doubt.

Cheng Nuo dragged the mouse and continued to look down.

The simple solution method proposed by Wang Genji is as follows:

In the first step, the solution of the pseudo-homogeneous differential equation is obtained.

The second step is to change the constants of the solutions of pseudo-homogeneous differential equations.

The third part is to bring it to the original equation to verify the solution.

On the surface, it is indeed simpler than the constant variation method.

The content of the following thesis is Wang Genji's use of formulas to demonstrate the feasibility of this solution.

Cheng Nuo took a rough look.

In general, Wang Genji's thesis is very clear.

From proposing a conjecture, to proving the conjecture, to explaining the advantages of this solution compared to the constant variable method.

but……

After simply scanning it from beginning to end, Cheng Nuo finally understood why Wang Genji's paper was sent back by the SCI journal for overhaul.

In the third process formula in the later stage of argumentation, a serious logical error appeared!

I don't know the true face of Lushan Mountain, only because I am in this mountain!

As the author of this paper, Wang Genji found it difficult to find his own mistakes. On the contrary, Cheng Nuo, a bystander, discovered the problem after scanning the paper from beginning to end.

On the qq side, Wang Genji didn't seem to think that Cheng Nuo could find the mistakes in his thesis.

Although he had to admit Cheng Nuo's strong talent in mathematics.

But with Cheng Nuo's current knowledge base, it was still uncertain whether he could understand his thesis.

Yawning, Wang Genji sent a message to Cheng Nuo, "Okay, Cheng Nuo, I'm going to sleep first. For the project, I'll spare time tomorrow to look at your research results and start working on mine."

Wang Gen basically planned to turn off the computer and go to sleep, but when he looked up, he found that Cheng Nuo had sent him a message back, "Senior, wait a minute, I seem to... know what's wrong with you."

What? !

Seeing this message, Wang Genji woke up mostly from sleepiness.

Is this... true or false? !

It took less than five minutes for him to post the paper, and it was considered time-consuming to read it from beginning to end. But Cheng Nuo told him to find the major logical error mentioned by the review editor of the sci journal.

how is this possible!

Wang Genji typed impatiently, "What you said is true?"

Cheng Nuo: "Of course."

Wang Genji: "What went wrong?"

Cheng Nuo: "It's not clear on QQ,

Senior, why don't we make an appointment tomorrow and let's discuss it. "

At this time, Wang Genji's heart was scratching like a hundred claws, eager to know where the mistakes in his thesis appeared now.

This question has troubled him for two whole days.

Don't think about tea, don't want to eat. The figure is getting thinner and thinner day by day.

But he also knows that it is difficult to explain academically without meeting and talking in person.

Wang Genji: "Okay. Just tomorrow afternoon, I'll wait for you in the grove beyond the west playground."

Cheng Nuo: "Well, see you in the grove."

In the dormitory, Cheng Nuo read Wang Genji's thesis from beginning to end, then climbed into bed and got ready to sleep.

Suddenly, in the dark night, under the dim light in the corridor, Cheng Nuo saw Yuan Hua sitting up straight suddenly, facing Cheng Nuo's direction, and laughed, "Your chrysanthemum is really tight."

Cheng Nuo's hairs stood on end in an instant, and he subconsciously protected his chrysanthemum.

I... I wipe! What is Yuan Hua trying to do, taking advantage of the black moon and the wind to fuck himself up? !

After Yuan Hua finished saying that, he smacked his mouth and lay down straight again. Soon, the snoring sounded.

Cheng Nuo patted his chest: "So it was talking in sleep!"

He has a feeling of being left behind. Just now, he almost lost his eighteen-year virginity.

He was just lying on the bed when he heard Yuan Hua talking in his sleep again.

"Big brother, big brother, don't kill me."

"I'll give you all the guns..."

…………

There was no class in the first and second quarters in the morning, and Cheng Nuomei slept until after nine o'clock in the morning, and went to the finance department class with Yuan Hua and the others.

"Cheng Nuo, why do you keep looking at me like that?" In class, Yuan Hua said to Cheng Nuo who was sitting next to him with an inexplicable expression.

Cheng Nuo looked strange, "It's nothing, it's nothing."

In the lecture hall, the teacher of the meditation class told the students about the core values ​​of socialism.

Spread the light of Marxism to the world.

The students in the audience also looked drowsy. Most of them were busy with other things, and very few people listened carefully.

Thinking about this course is based on pure memorization. For a science and engineering student like Cheng Nuo, he really couldn't arouse much interest in listening to the lecture honestly in class.

The course preaches the legal part, about rape.

The teacher glanced at the roster, called out names, and said, "Student Cheng Nuo, get up and tell me which of these behaviors do not constitute the crime of rape."

Cheng Nuo, who was called up to answer the question, looked up at the podium.

On ppt, there are several options.

a, male xxoo female

b. Female xxoo male

c. Female xxoo female

d. Male xxoo male

Cheng Nuo: "..."

This question is really sharp!

"This..." Cheng Nuo hesitated and stood there without giving his answer.

"Okay, sit down." Teacher Sixiu waved his hand, signaling Cheng Nuo to sit down, and then patiently explained to everyone under the podium.

"Of the four types of behavior, only the first type will cause the crime of rape. The remaining three types of behavior are not within the scope of the sentence for rape, so..."

Said, Sixiu gave everyone an expression that everyone understood.