Chapter 156 Can You Chew This?

Seeing Wu Bin's slightly disappointed expression, Gu Ningshan also felt very sad. The reason why she suddenly mentioned the atomic model was because Wu Bin had just praised her for being very powerful. So in order to reinforce Wu Bin's impression, she took the initiative to raise this topic, but she didn't expect it. Only half an hour...

She was taken into a ditch by Wu Bin!

‘If there is a formula for universal gravitation, use it! Why are you so imaginative? Do you know that this is called cutting corners? ’

But Gu Ningshan couldn't cry out, because although the problem of how gravity is generated has not been completely solved, there are indeed people who are studying it, and there are many results, but she has not studied this in depth, so the fact That is, she was knocked down by Wu Bin, which made her very angry!

Song Nanfeng, who was watching the excitement, was about to snicker when he saw Wu Bin's eyes moving towards him. This made him feel uncomfortable. He didn't want to spend the whole night discussing this horny issue with Wu Bin.

So he stood up with the dinner plate and said, "Let's go when you're done eating. I'll take you to a night tour of Spectacle Lake."

As soon as he heard that he was going to visit the lake, Wu Bin immediately lost interest and said, "How about tomorrow?"

"Okay, then you plan to go back to the hotel now?" Song Nanfeng asked.

"No, I plan to go to the library for a while. I just saw a book that I was very interested in."

Song Nanfeng was a little dumbfounded after hearing this. Although he paid so much attention to Wu Bin because he loved learning so much that he went crazy, but he only came to HKUST for a few days this time, and he couldn't let him spend all his time in the library. After all, I have no advantage over Jingbei when I make the decision to come to HKUST!

"I'll go with you." Gu Ningshan finished the last mouthful of the porridge that had already gone cold, wiped her mouth, jumped off the chair and looked at Wu Bin and said.

"Okay." Wu Bin nodded. He didn't mind having another library partner.

"Then I'll go with you." Ding Yuhai finished clearing the plates and stood behind the two of them.

Looking at the backs of the three of them, Song Nanfeng touched his chin, suddenly raised his eyebrows, nodded and said, "Then you all go together. Remember to take good care of this junior."

"I know~" the two girls said at the same time.

When they arrived at the library, the three of them sat down quietly, opened their favorite books and started studying.

Until late at night, Ding Yuhai suddenly asked the two others in a low voice: "I'm a little hungry. Do you want to go have a midnight snack?"

Gu Ningshan raised her head and nodded in agreement. She was probably a little hungry.

Wu Bin whispered: "You go ahead, I'll watch for a while."

After hearing this, Gu Ningshan tilted her head and glanced at the cover of the book in Wu Bin's hand.

《INTRODUCTION TO LINEARALGEBRA》

"Can you even chew this book?"

Gu Ningshan's tone was a little surprised. This book on linear algebra was written by Gilbert Strong from MIT. It is considered one of the pinnacles of linear algebra textbooks. She has also read it, and it is indeed very comfortable to read. , but this boy in front of me...

"Let's go have a late-night snack. I've also read this book. I can talk to you about my experience. I'll lend the book to you."

When Wu Bin heard this, his butt, which seemed to be "attracting" to the chair, lost its "magnetism" in an instant. He closed the book and stood up, nodding towards Gu Ningshan.

After leaving the library and no longer having to speak carefully, Gu Ningshan asked Wu Bin: "How much have you learned on your own?"

"I didn't study much by myself. Most of them were learned at the national team training camp at Peking University. After the professors finished teaching their own courses, they taught us a lot of other things and also recommended many books, including It included this linear algebra textbook, so I wanted to read it when I saw it in the afternoon.”

"I really want to participate in the physics competition..." Gu Ningshan muttered, and then asked: "Oh, by the way, you haven't answered me yet, can you even read this book?"

"It's okay. This book is really well written and can be explained in a simple way."

"Okay~ Your English is good, but this book is quite unfriendly to people who don't have enough vocabulary." Gu Ningshan stood on tiptoe and praised Wu Bin.

"Because a teacher once told me that if you don't learn English well, you won't be able to access the most cutting-edge knowledge, so I studied English very hard."

At this time, Ding Yuhai on the side couldn't help but said: "Aren't you going to discuss what we are going to eat later?"

"Anything is fine." Wu Bin and Gu Ningshan said at the same time.

Ding Yuhai sighed and couldn't help but hold his forehead.

After walking a long way after leaving the University of Science and Technology, Wu Bin, who was still discussing linear algebra with Gu Ningshan, suddenly discovered something, that is, there were almost no shops around the University of Science and Technology, and it looked very depressed.

"Are there even any barbecue stalls nearby?" Wu Bin asked.

"You'll get it after walking for a while." Ding Yuhai replied.

Wu Bin nodded, looked at Gu Ningshan and asked, "But is it really okay for you to come out so late?"

"It's okay to escape for the night once in a while~ I'll stay at my senior's house tonight."

‘As expected of a university, it is truly free! ’

Although I don’t know if this is a correct impression, Wu Bin remembered it anyway.

As Ding Yuhai said, not long after walking, Wu Bin saw a food stall at the corner, but it was not very lively.

"Come, come, you three, sit inside." The boss who was cooking saw Wu Bin and the others stopping in front of his stall and immediately greeted him enthusiastically.

"Is this all right?" Ding Yuhai asked Wu Bin.

"Okay." Wu Bin nodded.

"That's it." Ding Yuhai pointed to an empty table in front of him.

As soon as he sat down, Wu Bin couldn't wait to spread out the book that Gu Ningshan borrowed for him, pointed to a question on it and asked: Why is the last matrix e^At? What does e^At equal? "

"Let me see." Gu Ningshan came to the book to read and replied: "e^At, if A is not a diagonal matrix, then it does not mean that each element becomes the power of e. If we simply follow the definition , it is defined by expanding e^x power Taylor into infinite terms, substituting x=At into it, and then looking at the situation of each element."

"Expand according to Taylor? Then after expansion, it has nothing to do with the exponent of e. It all becomes a matrix operation containing the variable t. How can this correspond to the answer in the book?"

"Two great geniuses, can't they have a good meal first before discussing the topic?" Ding Yuhai asked, dumbfounded.

She originally thought that Gu Ningshan was already addicted to books, but she didn't expect that something even more cruel would suddenly come her way.

"Just finish talking about this question." Wu Bin raised a finger to Ding Yuhai.

"Okay...then you guys talk and I'll help you order. Are there any taboos?"

"No, thank you." After Wu Bin finished speaking, he continued to look at Gu Ningshan and asked: "For example, the third picture here shows the proof of the exponential function of a diagonal matrix = taking the exponent on the diagonal element..."