Xueba's Sea of ​​Stars

Chapter 188 It's Not a Shameful Thing to Brush Questions

At around 10 o'clock in the evening, Wu Bin returned to the dormitory, and found that the other three people in the dormitory were lying on the desk and writing quickly.

"Oh, it's rare." Wu Bin found it rare to see three people working together.

Hearing Wu Bin's teasing tone, Li Yan raised his head first and said, "It's really rare that you came back so early. Is that paper on graphene finished?"

Wu Bin: "You guessed it all, it's just finished."

"Ah!!! Wu Shen, please use your magical powers. I'm so miserable." Chen Anzhi, who was sitting next to Li Yan, dropped his pen with a look of despair on his face.

"What's the situation?" Wu Bin was a little confused.

"I'm about to be killed by wire generation and electromagnetism. I thought it would be easier to learn after a little competition." Chen Anzhi scratched his hair, but after thinking about it, he stopped his hands distressedly, and looked at him pitifully. Wu Bin: "Boss, can I borrow your notes to take a look? I can wash your socks for you!"

"I contracted the underwear! Let me take a look too? It would be even better if you can give me some pointers." Li Boxin couldn't help but shouted.

"Alas~" Wu Bin sighed, walked to Chen Zhian and glanced at the questions he was working on.

"Kneeling on the matrix?"

"Wu Shen is wise!"

Picking up a pen casually, Wu Bin tapped on the matrix question and said: "First use the row transformation, then use the inverse matrix, and calculate the adjoint matrix after knowing that the determinant of the matrix is ​​equal to -1. This, for the elements numbered mn, cross out The mth row and nth column of the original array..."

"Wait, wait, let me digest it first." Chen Zhian couldn't help but feel his face a little hot when he spoke, obviously they were all freshmen, and the gap was too big...

"Hmm..." Wu Bin made a meaningful nasal sound, and asked, "Do you think the line agent is here to kill you?"

At this time, Li Boxin quickly replied, "It's not just that, it's still the kind that doesn't give you a good time, all kinds of torture."

Chen Zhian immediately nodded in agreement.

Wu Bin: "To be honest, I think Teacher Luo's class is pretty good. It not only talks about knowledge points and mathematical ideas, but also covers practical applications. Could it be that you two didn't listen carefully?"

"Heaven and earth conscience, I don't even dare to blink my eyes when I'm on the line as a substitute class." Chen Zhian sighed, "Oh, I learned mathematics in high school quite easily, but this mathematics in college makes me feel like I can't read it. It’s like a fake high school, completely clueless.”

Wu Bin: "Normally, a big difference between high school mathematics and college mathematics is that college mathematics is basically starting to move in the direction of modern mathematics, while modern mathematics is developing in an abstract direction."

Li Boxin: "I'm about to have a convulsion..."

Ignoring Li Boxin's complaints, Wu Bin went on to say: "The advantage of abstraction is that the more abstract the tool, the wider the scope of application. The cost is that it is more difficult to start."

"Mathematics is not like physics. Many things can be understood with the help of concrete things. If you want to learn mathematics well, you must establish a mathematical sense for abstract things. Do you understand the mathematical sense?"

"I don't understand." Chen Zhian shook his head for a while.

"Hey, let's do more questions. It's difficult to build up this feeling without doing a certain amount of exercises."

Chen Zhi'an: "I'm doing this right now... Does God Wu have any tricks to teach me?"

"You do more questions before you talk."

"You have to have a goal when doing the questions... I'm in a panic right now, I don't want to fail my freshman year..."

Hearing Chen Zhian's tone of crying, Wu Bin thought for a while, and said, "Tsk, if you really want to say something, for example, you can draw a picture from the intuitive feeling or think about it in your mind for a question, and the conclusion you need to prove will come out. Have you ever felt this way?"

"Hey, I often feel this way!" Li Boxin on the side looked very excited, as if he had been poked at some G-spot.

"But you can't write it in a strict mathematical logic language, can you?"

"Oh... yes." Li Boxin was silent at once.

"It means that you still don't know how to do this kind of problem. Take the relatively simple intermediate value theorem of continuous functions in calculus as an example. If a problem asks you to prove this theorem, you may draw a picture and feel that there is a function whose value is greater than 0, if there is a function value less than 0, then this curve is continuous and will definitely pass through the x-axis, but I don’t know how to express it..."

Listening to Wu Bin's concise and clear learning ideas, Li Boxin and Chen Zhi'an nodded frequently, flashing an expression of "I see" from time to time.

"So let's talk about it, I think that for the course of mathematics, such as finding a limit in calculus, you may sometimes feel that it is obviously equal to 1 when you look at it with your eyes, but if you prove it in strict language, you will not be able to prove it. It’s actually not the same as it would be.”

"Because the purpose of this question is to examine your use of mathematical language to demonstrate. If you can't prove it, it means that this aspect has not met the standard."

Seeing the thoughtful looks of the two, Wu Bin finally concluded.

"I just want to express a meaning after saying so much. Only when you know how to do the questions can you really understand. It is never a shameful thing to do the questions."

"Ahem...did I show it so obviously?" Chen Zhian blushed.

Being able to get into the University of Science and Technology, Chen Zhian is still very confident in his academic ability, so he always feels that brushing up questions is a very low behavior. Even if he can't keep up with the progress of the class, he still thinks it may be his learning method or thinking. problem.

It's a bit embarrassing to be pointed out by Wu Bin now.

On the other side, Li Boxin had already silently brushed up the questions.

"What about you, are you also doing homework in the liver course?" After calling the two of them, Wu Bin looked back at Li Yan.

"No, I'm writing a manuscript, and I'm going to criticize a civil science on Weibo, oh no, public knowledge."

"You really have a leisurely heart..."

"It's not that I'm idle. I feel uncomfortable watching this bitch jumping up and down, and I'm kidnapped by morality every now and then. Here, let me show you." Li Yan held out his mobile phone in front of Wu Bin as he spoke.

Wu Bin took a look and found that he was tearing up something about the stock market.

"You have researched on stocks!?" Wu Bin was startled.

"I understand a little bit, but it's not stocks that are being torn up. It's a 2B public who insists on elevating the stock market crash to the level of national instability, and there are a bunch of booing after it. It's just plain."

"Isn't this the basic operation of Weibo?" Wu Bin said, pushing the phone back.

When he was just playing Weibo, he came across a hot search where someone called Yang Zhenning. It listed some examples of Yang's status in the physics world, as well as what contributions he had made and what awards he had won.

At that time, Wu Bin was shocked to see that one person could make significant contributions in statistical physics (Li Yang theorem, Young Baxter equation), particle physics (parity non-conservation) and field theory (Yang Mills) at the same time. .

(End of this chapter)