Chapter 581：

For Lin Xian, Lagrange's median value theorem, the basic theorem of one-fold calculus, is as simple as elementary school addition, subtraction, multiplication and division.

Moreover, his age is the same as these students, so his speech style is not as rigid as some teachers, but often witty words, often popping up one or two Internet buzzwords.

The content of the lecture is also simple and easy to understand, so the students listened with gusto.

Time passed unconsciously, and halfway through the course, only a middle-aged man with fat Lu Xian rushed into the classroom.

When he saw Lin Xian talking on the podium, he was taken aback.

The two of them stared wide-eyed and fell into silence.

Wang Zhouji was a little annoyed. Before class, something urgent happened at home.

Generally speaking, you need to say hello in advance if you are temporarily dragging a substitute class, but how can you find it a few minutes before class like him.

However, family affairs were more urgent, and Wang Zhouji had to go home and deal with it first without relatives.

Fortunately, things were handled quickly, but when he hurried to the classroom, he suddenly found a young man on the podium giving a lecture.

To be honest, this is a good thing for him.

Because the teacher skipping class without asking for leave can be a big or a small thing.

When I get younger, I will be late for a while, and at most let the students go to study for a while.

But going bigger, if you are reported by someone who is interested, it is a teaching accident, which is serious.

Now that someone is helping him with lessons, it is a good thing in theory, but the problem is... he didn't hire someone to help him with lessons!

Or is it that the school has arranged a teaching assistant for itself?

But I haven't received a notice!

After a few seconds, Lin Xian reacted first and hurriedly said with a smile: "Professor Wang, have you handled the matter?"

"Uh... dealt with it!"

Professor Wang smiled politely and nodded, but he was still confused.

Do we... know each other?

Lin Xian put down the chalk and suggested, "Since you have handled things well, let's give a lecture!"

Wang Zhouji glanced at the blackboard, then glanced at the group of students sitting in distress, and waved his hands: "No, no, you continue to lecture. I'll listen for a while."

With that, he found an empty seat to sit down.

The other students didn't find it strange, but Yan Xiaoman and Zhou Hui looked strange.

Although there was an extra professor in the classroom, Lin Xian didn't have stage fright, so he said what he said.

Wang Zhouji was a little nervous at first, but when he listened, he couldn't help but raised his eyebrows: Oh, this young man is good at teaching!

Although it is still a bit jerky, but the math level is no problem, the knowledge points are very thorough.

This made his originally hanging heart, could not help letting go.

During one class, Lin Xian finished Lagrange's median theorem. He glanced at the time on his watch and found that there were still two minutes before get out of class ended. He couldn't help but smirk and said, "Now assign homework. The content is Is it necessary to think about the conditions of Lagrange's Sino-Japanese median value theorem? If not, please give an example."

Assigning homework is just a bad taste for him temporarily.

But he didn't expect that the feeling of assigning homework to students would be so...

Cool!

He now finally understands why some teachers like to assign homework to students so much, because this kind of thing is addictive.

It's so cool...

He feels good, but the students feel sore.

Do you still have homework?

In the past, Professor Wang Zhouji never assigned homework in class because mathematics had little influence on their major.

Zhou Hui bitterly said, "Xiaoman, how do I feel that your boyfriend did it on purpose?"

"Be confident, get rid of the feeling, this **** is on purpose!" Yan Xiaoman said coldly while grinding Xiaohu's teeth.

Chapter 39 The idea is very unique!

This guy is addicted to acting. Not only does he embarrass himself, he even arranges his homework in a decent way.

Yan Xiaoman squinted, thinking about where to bite him later.

Just then, the get out of class bell rang.

The students in the classroom stood up one by one, packed their books, and walked out of the classroom one after another.

Lin Xian put down the chalk in his hand and suddenly realized that Professor Wang Zhouji hadn't left yet, and was looking at him with a smile.

Walking forward, Lin Xian smiled apologetically: "Professor Wang, I'm sorry, I'm causing you trouble."

"It should be me thanking you!"

Wang Zhouji helped his eyes and said with interest: "The young man looks very face-to-face, a new graduate student from a few colleges?"

After listening to half of the class, he naturally mistaken Lin Xian for a graduate student in the Department of Mathematics.

Upon hearing this, Lin Xian explained: "I am not a student of FD, and I will be with my girlfriend today."

It turns out that I am not a graduate student of FD.

Although it is impossible for a professor to remember all graduate students, in a department, he can always be familiar with each other.

Although not a student of FD, Wang Zhouji was still very interested in him, and asked with a smile: "Young man, who is your teacher?"

The domestic mathematics circle is so big, you can see you when you look up, even if you are unfamiliar, at least you should have heard of it.

Lin Xian was too lazy to explain that he was not a graduate student, so he simply reported Lao Dai's name? "Oh, Lao Dai!"

Wang Zhouji obviously knew Dai Pingbo, and he seemed to have a good relationship, so he joked: "Old Dai has good luck, so he picked a good seed for him."

Even if Lin Xian did him a favor, and with this relationship, the smile on Wang Zhouji's face was even thicker: "Which direction of research?"

"Number theory!"

"Number theory?"