Wandering Spaceship in Deep Space Chapter 30: Uh, this…Green’s function?

　　beauty teacher Wang Lili slowed down and said: "Well... today I will teach you some knowledge of mathematical and physical equations. Of course it is 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 　　 came out, there was a wailing.

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

　　 Is this class exploding!

　　 The final questions in the ordinary math exams, such as Fourier transform, orthogonal expansion, ordinary differential equations, etc., have become regular tools here. Isn’t it difficult?

　　 didn't talk too much nonsense, and the teacher started to attend class formally.

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

　　 Ye Kaifu glanced at Zhang Yuan habitually, and found that this great **** was still wandering around, not knowing what he was thinking.

　　 wait a minute.

　　 He seems to be asleep!

　　 fell asleep, really fell asleep!

　　haha!

　　 Ye Kaifu almost laughed out loud. Seeing that he had the upper hand in terms of "effort value", he felt so happy that he almost exploded in the seat.

　　 "Work hard, work hard, I can't make a runaway when he sleeps!"

　　 "I want to take the opportunity to learn more."

　　"Most textbooks nowadays use the three-dimensional Laplace equation as the background to establish the Green's function method. Its core content is the Green's formula in spatial form and a one-point analytical representation of the three-dimensional harmonic function. The Green's function method for two-dimensional problems and There are similarities in the three-dimensional problem...%@@!"

The content of 　　 is obviously difficult, even with a high-profile appearance, there is no way to directly improve the IQ of male animals. So the whole classroom atmosphere has been very embarrassing, equivalent to a pretty 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 had to skip some content from time to time.

　　 I jumped and jumped and I didn't know what the teacher was talking about.

　　 He gave up treatment altogether, and didn't dare to play with his mobile phone in the first row. It would be good to appreciate the teacher's appearance.

　　 "Oh my god... I finally know why the boss is too lazy to take this course, and then send me over."

　　 "It's really torture!"

　　 Seeing a pair of bewildered eyes, a group of guys dozing off with their heads, plus the little cripples playing with mobile phones, and Wang Lili standing in front of the blackboard, she kept complaining in her heart.

　　"This is totally teaching a group of pigs..."

　　 So, she seems to have forgotten that she also came here back then. Her teacher regarded her as a pig.

　　 "Hold it, hold it back!"

　　 "I can't help it, I'm so upset!"

　　Wang Lili, after all, does not have the broad-mindedness of a large number of students playing mobile phones, dozing off, and chanting like the old professor.

　　 She is also very upset in her heart, I worked hard to prepare lessons, are you guys playing down here?

　　 Why? Let me recite scriptures on it like a nun, this palace can’t do it...

　　 Well, just call a few people to enliven the classroom atmosphere, and wake up the sleeping person!

　　 That's it!

　　 The boy in the first row looked serious, and he was sitting in the first row at the beginning, and the probability of learning to dominate was extremely high.

　　 should be able to answer the question, it's him, everyone doesn't hurt face, and can wake people who are sleeping.

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

　　 The atmosphere in the entire classroom suddenly became serious. The "calling" was indeed a nuclear weapon in the classroom. Almost all the sleeping classmates 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...

　　 "What? Is it me?" Ye Kaifu stood up, blushing.

　　 He pretended to study hard, but was called to answer questions.

　　 is so miserable.

　　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.

　　 Except for these words, there seems to be nothing.

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

　　 Unfortunately, even if his head burst, it is impossible to solve this problem.

　　 "Hey, sit down, sit down..." Wang Lili didn't expect that the good student in the front row couldn't answer, so she waved her hand dejectedly.

　　 Maybe it’s too bad what I said, or maybe it’s too difficult...

　　 However, the atmosphere in the classroom has improved a lot.

　　 After that, everyone else has already set up their sitting positions, and only a few diehards are still asleep, the kind that really fall asleep.

　　 Especially the one on the leftmost side of the first row, sleeping too comfortably, right? The first row is still sleeping, the impact is too bad!

　　 "Does anyone know how to do this? Just follow the method I just said, using a harmonic function..." Wang Lili repeated.

　　The atmosphere in the classroom was awkward.

　　 "Where is this... the leftmost student?"

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

　　What's the matter?

　　 Zhang Yuan opened his eyes blankly~IndoMTL.com~ There was a small laughter in the classroom.

　　 "The teacher asked you to do the topic!" Ye Kaifu, who was sitting on the side, winked, and was so happy.

　　 Zhang Yuan blushed and scratched his head embarrassedly.

　　 accidentally fell asleep because of continuous liver burst and excessive fatigue.

　　"This classmate, can you do it?"

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

　　Everyone is an adult, and you are responsible for your own life, and there is no need to overly criticize and correct others.

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

　　 Zhang Yuan glanced at the PPT, his a little blinded head became clear, he whispered: "It should be done with Green's function..."

　　 Everyone laughed, and they all taught Green's function for a lesson. Even the pig remembered these four words. Dare to love this guy slept for a whole class, only repeating these words.

　　Zhang Yuan only paused for two seconds, then continued: "Let v be another known harmonic function on plane D. From Green’s formula, 0=∫∫(v?u/?nu?v/ ?n) dδ, after the two equations are subtracted, there is...Considering the boundary conditions..."

　　 "￥@……%￥"

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

　　 After thinking and 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 break...

　　 Whispers sounded in the classroom.

　　What's the situation?

　　 A sleeping brother killed them all in seconds!