Chapter 30: Erm, This Is… Green’s Function?

Wang Lili, the beautiful teacher, slowed down and said, “Well, I’ll be teaching you about mathematical physics equations. Of course, it’s not the linear homogeneous system of equations you’ve learned before in class, but instead… the Green’s function of two-dimensional laplace equation ”

When she said the last sentence, sounds of wailing could be heard from everywhere in the lecture room.

Ye Kaifu finally understood why no one sat in the front rows.

This lecture was exceedingly difficult!

The most difficult questions found in normal maths exams such as the fourier transform, orthogonal expansion, ordinary differential equation and so on became necessary tools for this topic. How could it not be difficult?

Without any nonsense, the teacher officially began the lecture.

“I believe you have all learned both homogeneous and non-homogeneous partial differential equations but due to time constraints, we will not review them again in this lecture…”

Ye Kaifu habitually glanced at Zhang Yuan and realized that his mind seemed to be wandering around somewhere.

‘Wait a minute.’

‘He seems to have fallen asleep!’

‘He’s asleep, he has really fallen asleep!’

‘Haha!’

Ye Kaifu nearly laughed out loud. When he saw that he had finally gotten the upperhand, he felt so happy that he almost stood up in happiness.

“Let’s work hard! I can’t be absentminded now that he’s finally fallen asleep! I’ll take this opportunity and increase my knowledge.”

“Most textbooks nowadays use a three-dimensional laplace equation as a basis to construct Green’s function and the core content is Green’s formula in spatial form, three dimensional harmonic function. Green’s function used in two-dimensional questions are similar to three-dimensions in… %@@!”

The content that was being taught was obviously difficult. Even a beautiful face could not directly improve the IQ of these male students. Thus, the entire classroom atmosphere became awkward. It was as if the beautiful teacher was talking to herself on the podium.

The basic knowledge of Green’s function method were double and triple integral. Ye Kaifu racked his brains, but he had more or less forgotten about what he learned in the past. Moreover, he had to skip some of the lecture content from time to time.

As he skipped through the lesson content from time to time, ultimately he ended up not understanding what the teacher was teaching.

In the end, he simply gave up trying but since he dared not play his phone while seated in the first row, it was also pretty good to admire the teacher’s appearance.

“Oh god… I finally know why my senior isn’t attending the lesson and has sent me here instead!”

“This is simply a torture!”

When Wang Lili saw those pairs of confused gazes, a few students who fell asleep, and another group of students fiddling around with their phones, she was continuously badmouthing them deep down.

‘This is simply like teaching a group of pigs…’

She seemed to have forgotten that she was the same as them in the past. Probably her teacher also looked at her like a pig just like what was doing now.

‘Bear with it, I’ll bear with it! Urgh, I can’t take it anymore, I’m pissed!’

In the end, Wang Lili was not as broad minded like the old professor who closed one eye and continued with his scripture reciting when the students were all playing with their phones or sleeping.

She was pissed off deep down. She had worked very hard to prepare the lecture but the students were playing with their phones instead?

‘On what basis should I be like a nun and stand here to chant sutra? I can’t swallow this…’

‘Well, I shall pick a few students to liven up the class atmosphere. It’ll be good if I can wake up those who are asleep! That’s it!’ Wang Lili thought and made the decision.

‘That male student seated in the first row seems pretty serious and he has also sat in the first row from the start of the lecture. The chances of him being a smart student is pretty high. He should be able to answer the question, right? I’ll call him out then. If he can answer it, everyone won’t be too embarrassed and it can also wake up those who are sleeping.’

“That student over there, please come and explain this question!” all of a sudden, Wang Lili said with a smile.

The atmosphere of the entire classroom suddenly turned serious. As expected, roll call was a nuclear weapon and almost all the sleeping students suddenly descended from the heavens and rapidly returned to the human world.

Those who were fiddling with their phones also kept the device in their pockets.

“What? Me?” Ye Kaifu stood up with a flushed expression.

He pretended to be listening to the lesson properly and as a result, he had been called out.

How miserable. For real.

“Student, you can think about it first…” Wang Lili added on.

“Erm this… Green’s function… two-dimensional Green’s function…” Ye Kaifu said weakly.

Other than these few words, it seemed like he had nothing else to say.

He kept scratching his ears as his brain was churning violently.

But unfortunately, even if his brain were to explode, it was impossible for him to solve this question.

“Sigh, you can sit down…” Wang Lili did not expect that even the good student seated in the first row could not answer the question. She could only wave her hand in frustration.

Perhaps the way she explained was too difficult to understand or maybe the contents were too difficult.

However, the classroom atmosphere had improved considerably.

After this incident, a lot of the students started to adjust their posture. However, there were a few diehards who were still in their dreamland, those that had really fallen asleep.

‘Particularly that student there who is seated in the first row. Isn’t he sleeping too comfortably? He is sitting in the first row and still dares to sleep? What a bad influence!’

“Is there anyone who knows how to solve this question? You can follow the method I mentioned earlier, by using harmonic functions…” Wang Lili repeated herself.

The classroom atmosphere still remained awkward.

“What about the… student seated at the left most corner?”

Ye Kaifu hastily patted Zhang Yuan who was sound asleep, causing him to jump up from his seat with a shout.

‘What’s up?’

Zhang Yuan opened his eyes blankly.

A wave of giggle sounds could be heard in the classroom.

“The teacher asked you to solve a question!” Ye Kaifu seated to his right was winking at him while feeling gleeful deep down.

Zhang Yuan turned red and scratched his head in embarrassment.

Due to the consecutive days of hardcore studying resulting in excessive fatigue, he had accidentally fell asleep.

“This student, can you solve it?”

Even though she was slightly unhappy, Wang Lili still intended to have the student sit down as waking him up was enough.

They were all adults and they were all responsible for their own lives. So there was no need to criticize others excessively.

Moreover, this lecture was arranged by the school for the various upcoming competitions and there was no examination for this.

Zhang Yuan glanced at the powerpoint and his somewhat blurry mind started to clear up. He softly said in response, “It should be solved using the Green’s function…”

Everyone laughed in response. The teacher had been talking about Green’s function for an entire lecture now, even pigs could remember those two words by now.

Zhang Yuan paused for two seconds before continuing, “Let v be another known harmonic function on plane D and use Green’s function 0=∫∫(v∂u/∂n-u∂v/∂n)dδ. After the two equations are subtracted, there is… considering the boundary conditions…”

“¥@… %¥”

A few smarter students focused on Zhang Yuan’s explanation and they seem to vaguely understand what he was talking about.

From the looks of it, his solution seemed right and it was not random nonsense.

If a person could talk rubbish to that type of fluency, then he or she should be getting a medal…

Sounds of whispering could be heard within the lecture room.

What was with the current situation? A bro who had been sleeping the whole time had insta-killed all of them!