The beautiful teacher Wang Lili slowed down and said, "Hmm...... Today I will teach you some knowledge about mathematical physics equations. Of course, it's not the homogeneous equations learned in class, but ......"

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

As soon as this sentence came out, there was a wail.

Ye Kaifu finally knew why there was no one in the first three rows.

What a blast this course is!

The finale questions in ordinary math exams, such as Fourier transform, orthogonal expansion, ordinary differential equations, etc., have become routine tools here, can it not be difficult?

Without much nonsense, the teacher began to officially start the class.

"Ladies and gentlemen, I believe you have already learned homogeneous partial differential equations and non-homogeneous partial differential equations, but due to time constraints, I will not review them here......"

Ye Kaifu habitually glanced at Zhang Yuan, and found that this great god was still wandering, and he didn't know what he was thinking.

Wait a minute.

He seems to be asleep!

Asleep, really asleep!

Ha ha!

Ye Kaifu almost laughed out loud, seeing that he had the upper hand in terms of "effort value", not to mention how cool it was in his heart, the whole person almost exploded in his seat.

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

"I'm going to take the opportunity to learn more."

"Most of the current textbooks use the three-dimensional Laplace equation as the background to establish the Green's function method, and its core content is the Green's formula in spatial form and the one-point analytical representation of the three-dimensional harmonic function. The Green's function method for two-dimensional problems is similar to that of three-dimensional problems......%@@! ”

The content of the lecture is obviously difficult, and even if you are good-looking, you can't directly improve the IQ of the male animals. So much so that the whole classroom atmosphere has been very awkward, which is equivalent to a beautiful girl talking to herself on the podium.

The basic knowledge of Green's function method is double integration and triple integration, Ye Kaifu racked his brains, but found that he had forgotten about it a long time ago, and he had to skip some content from time to time.

As a result, I didn't know what the teacher was talking about.

He simply gave up the treatment, and he didn't dare to play with his mobile phone in the first row, and it was good to appreciate the teacher's appearance.

"Oh my God...... I finally figured out why the boss was too lazy to take this class and sent me over. ”

"It's torture!"

Seeing a pair of dazed and overwhelmed eyes, as well as a group of dozing guys, plus Xiao Qisan, who was playing with his mobile phone, Wang Lili, who was standing in front of the blackboard, kept complaining in her heart.

"It's all about a class with a bunch of pigs......

Therefore, she seems to have forgotten that she also came over like this back then. Her teacher looked at her as a pig.

"Hold on, hold on!"

"I can't help it, I'm so upset!"

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

She is also very unhappy in her heart, I have worked hard to prepare for class, are you playing down there?

Why? Let me recite the sutra on it like a nun, this palace can't do it......

Well, just name a few people, liven up the classroom, and wake up the sleepers!

That's it!

The boy in the first row looked quite serious, and he sat in the first row at the beginning, and the probability of being a top student was extremely high.

should be able to answer the question, just him, everyone will not hurt face, and he can wake up the sleeping people.

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

The atmosphere in the whole classroom suddenly became serious, and the "roll call" was indeed a nuclear weapon in the classroom, and almost all the students who were sleeping suddenly fell from heaven and quickly returned to the world.

The person who played with the mobile phone also put the mobile phone back in the crotch of his pants......

"What? It's me? Ye Kaifu stood up and blushed.

He pretended to study carefully, and was called to answer the question.

It's miserable.

It's true.

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

"That, this...... Green's Function...... The two-dimensional Green function ......," Ye Kaifu said weakly.

Except for these few words, it seems that there is nothing left.

He kept scratching his head and touching his ears, and his brain rolled violently.

Unfortunately, even if his head exploded, it would not be possible to solve this problem.

"Hey, sit down, sit down......" Wang Lili didn't expect that the good students in the front row couldn't answer, so they could only wave their hands in frustration.

Maybe it's because I'm too bad, or maybe it's too difficult......

However, the classroom atmosphere is much better.

After that, everyone else was already seated, and a few of the diehards were still asleep, the kind that were really asleep.

Especially the leftmost person in the first row, he slept too comfortably, right? The first row is still sleeping, the impact is too bad!

"Is there anyone who will do this? Just follow the method I just said, use the harmonic function to ......," Wang Lili reiterated.

The atmosphere in the classroom was awkward at one point.

"This ...... What about the leftmost classmates? ”

Ye Kaifu hurriedly 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 small burst of laughter in the classroom.

"The teacher asked you to do the problem!" Ye Kaifu, who was sitting on the side, squeezed his eyebrows, he was so happy.

Zhang Yuan blushed and scratched his head embarrassedly.

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

"This classmate, will you do it?"

Although she was a little unhappy, Wang Lili was still ready to let this classmate sit down and wake him up.

Everyone is an adult, and they are responsible for their own lives, and there is no need to criticize and correct others excessively.

Moreover, this is only a course arranged by the school for various competitions, and there will be no exams, so it is not binding......

Zhang Yuan glanced at the PPT, his somewhat blinded head began to become clear, and he whispered: "It should be done with the Green function......"

Everyone laughed, and they all talked about the Green function for a lesson, and even the pigs memorized these four words. Dare to love this guy who slept for a whole class, and only repeats these words.

Zhang Yuan only paused for two seconds, and then continued: "Let v be another known harmonic function on the plane D, according to Green's formula, there is 0=∫∫(v∂u/∂n-u∂v/∂n)dδ, and the two equations are subtracted to have ...... Taking into account the boundary conditions......"

“￥@……%￥”

A few top students pricked up their ears and vaguely understood what he was talking about.

Thinking about it, it seems to be right, not nonsense.

If a person can really talk nonsense to this level, then it will be a big deal......

Whispers rang out in the classroom.

What's the situation?

A sleeping brother killed them all in seconds!