Chapter 31

The beauty teacher Wang Lili slowed down and said, "well... Today I'll teach you some knowledge about mathematical and physical equations. Of course, it's not the homogeneous equation learned in class, but... "

"Today we focus on the content: Green's function method for two-dimensional Laplace equation..."

Once this sentence came out, there was a wail.

Ye Kaifu finally knows why there are no people in the first three rows.

Does this class explode!

The final questions in ordinary mathematics exams, such as Fourier transform, orthogonal expansion, ordinary differential equations, etc., have become conventional tools here. Isn't it difficult?

Without much nonsense, the teacher began to have a formal class.

"Dear students, I believe you have learned homogeneous partial differential equations and non-homogeneous partial differential equations. Because of time constraints, we won't review them here..."

Ye Kaifu habitually glanced at Zhang Yuan and found that the great God was still wandering outside the object and didn't know what he was thinking.

wait a minute.

He seems to be asleep!

Asleep, really asleep!

ha-ha!

Ye Kaifu almost laughed. Seeing that he had the upper hand in "effort value", he almost exploded in his seat.

"Work hard, work hard, I can't wander when he sleeps!"

"I'll take the opportunity to learn more."

"Most of the current textbooks establish the Green's function method based on the three-dimensional Laplace equation. Its core content is the Green's formula in spatial form and a little analytical representation of the three-dimensional harmonic function. The Green's function method for two-dimensional problems is similar to that for three-dimensional problems...% @ @ "

The content is obviously very difficult. Even high looks can't directly improve the IQ of male animals. So that the whole classroom atmosphere has been very embarrassing, which is equivalent to a beautiful girl talking to herself on the podium.

The basic knowledge of Green's function method is double integral and triple integral. Ye Kaifu racked his brains, but found that he had forgotten almost all the time and had to skip some content from time to time.

As a result, I don't know what the teacher is talking about.

He simply gave up treatment and dared not play with his mobile phone in the first row. It was also good to appreciate the teacher's appearance.

"Oh, my God... I finally know why the boss didn't bother to take this course and sent me here."

"What a torture!"

At a loss make complaints about the eyes, and a group of sleeping snob guys, plus mobile phone small 3, standing in front of the blackboard Wang Lili, heart constantly Tucao.

"This is all about a group of pigs..."

Therefore, she seems to have forgotten that she came over like this. Her teacher should treat her as a pig.

"Hold it, hold it!"

"I can't help it. It's so bad!"

After all, Wang Lili does not have the broad mind of a large number of students playing with mobile phones and dozing off and still chanting scriptures like an old professor.

She is also very upset. I worked hard to prepare lessons. Did you play below?

For what? Let me chant on it like a nun. This palace can't do it

Well, just name a few people to activate the classroom atmosphere and wake up the sleepers!

That's it.

The boy in the first row looks very serious, and he sat in the first row at the beginning. He has a high probability of learning hegemony.

It should be able to answer questions. Just him. Everyone doesn't hurt face and can wake up people who sleep.

"This classmate, please solve this problem!" Suddenly, Wang Lili said with a smile.

The atmosphere in the whole classroom was suddenly serious. "Roll call" was indeed a nuclear weapon in the classroom. Almost all the sleeping students suddenly fell from heaven and quickly returned to the world.

People who play with mobile phones also put their mobile phones back in their crotch

"What? Is it me? " Ye Kaifu stood up and blushed.

He pretended to study hard and was called to answer the questions.

That's terrible.

really

"This classmate, first consider..." Wang Lili reminded a few more words.

"Well, this... Green's function... Two-dimensional Green's function..." Ye Kaifu said weakly.

Apart from these words, there seems to be no meeting.

He kept scratching his head and ears, his brain tumbling violently.

Unfortunately, even if his head burst, it was impossible to solve the problem.

"Hey, sit down, sit down..." Wang Lili didn't expect that the good students in the front row couldn't answer, so she had to wave her hand in frustration.

Maybe they speak too badly, or maybe these contents are too difficult

However, the classroom atmosphere is much better.

After that, everyone else had already set up their seats, and only a few diehards were still asleep. They were really asleep.

Especially the leftmost one in the first row, did you sleep too comfortably? The first row is still sleeping, the impact is too bad!

"Can anyone do this problem? According to the method I just said, use the harmonic function... "Wang Lili reiterated.

The classroom atmosphere was once very embarrassing.

"What about... The leftmost classmate?"

Ye Kaifu quickly patted Zhang Yuan, who was sleeping, and made him jump up from his seat with an "ah".

What's going on?

Zhang Yuan opened his eyes blankly.

There was a burst of small laughter in the classroom.

"The teacher asked you to do the problem!" Sitting on one side, ye Kaifu winked and was very happy.

Zhang Yuan blushed and scratched his head with embarrassment.

Because of continuous liver explosion and excessive fatigue, I accidentally fell asleep.

"This classmate, can you do it?"

Although a little unhappy, Wang Lili is still going to let the classmate sit down and wake him up.

We are all adults. We are responsible for our own life. There is no need to over criticize and correct others.

Moreover, this is only a course arranged by the school for various competitions, and there will be no examination. It has no binding force

Zhang Yuan took a look at the PPT and his slightly hoodwinked head began to become clear. He whispered, "it should be done with Green's function..."

Everyone laughed and talked about the Green's function for a class. Even the pig remembered these four words. I dare say this guy slept for a whole class and only repeated these words.

Zhang Yuan only paused for two seconds and continued: "let v be another known harmonic function on plane D. according to Green's formula, there is 0 = ∫ (V ∂ u ∂ n-u ∂ V ∂ n) d δ， After subtracting the two equations... Considering the boundary conditions... "

“￥@……%￥”

Several Xueba pricked up their ears and vaguely understood what he was talking about.

It seems right to think about it, not nonsense.

If a person can really talk nonsense to this level, he will break his head

There was a whisper in the classroom.

What happened?

A sleeping brother killed them all!