I Just Want to be a Shenhao Quietly

But when it came to sophomore year, things were different.

The difficulty of high numbers has risen a step in vain.

This increase in difficulty comes without warning.

At this time, it is not so easy to pass the test. As for the high score, you need to work as hard as you did in high school.

When it comes to learning calculus, most people are dumbfounded.

What is this?

When I come into contact with linear algebra and complex variable functions, I am afraid I will doubt life.

who I am?

where am I?

what am i doing?

Lin Xian can read the book very fast, because many of the knowledge points in the book are learned from high school mathematics, so he just glanced at it, and with the blessing of 100% memory, he will quickly recall it.

Time passed by minute by minute.

On the podium, Dai Pingbo was still explaining the knowledge in the textbook in a simple way.

Wang Zejing was drowsy, Zhang Kai absently looked at the backs of the girls in the front row...

Only Lin Xian read the book attentively.

Ling Xiaoyu raised his head for the third time and glanced at Lin Xian secretly.

After realizing that he was not paying attention, he carefully looked at it.

I have to say that men are the most attractive when they are doing something seriously.

Looking at his profile, Ling Xiaoyu unconsciously indulged in it.

At the beginning, she saw Lin Xian quickly flipping through the book, thinking that he was flipping through it randomly.

But gradually, Ling Xiaoyu realized that something was wrong, because Lin Xian's expression was extremely focused. This focus was not deliberately disguised, but revealed inadvertently.

He is really awesome!

Ling Xiaoyu held his cheeks with both hands, and couldn't help but sigh in his heart, at the same time a little distressed.

What to do, I like him more and more

will he like himself

I should like it... He even gave him a bracelet today.

Thinking of the bracelet, the corners of Ling Youyu's mouth lifted slightly, revealing a sweet smile.

There are some questions at the back of the textbook. At this moment, Lin Xian has taken out his pen and is working hard to solve the problems.

The sixth edition of Gaoshou TJ is simpler than other editions.

The reason is simple, because some knowledge points are deleted in this edition, and the content is not as much as other editions.

Basically non-985 or 211 colleges and universities, most colleges and universities will use the sixth edition, unless it is a mathematics major, will use the fifth edition, or even the fourth edition.

Therefore, the title of the book is not difficult for him at all.

Until the last question with an asterisk, the pen in Lin Xian's hand couldn't help but pause.

Let A be an mxn matrix and B be an nxm matrix and mn, and prove that det(AB)=0.

"Hey, this question is interesting."

Lin Xian pondered for a moment, his brain turned rapidly, and the various knowledge points he had learned before kept flashing in his mind.

After thinking for a while, Lin Xian suddenly heard the teacher say the get out of class was over.

A large class is divided into two sections, each section is 45 minutes, and there will be a 15-minute break in between

Glancing at Professor Dai Pingbo, Lin Xian's eyes lit up, and he quickly stepped forward with the textbook.

"Mr. Dai, wait a minute."

Dai Pingbo was about to go out with a teacup when he heard a student calling him and immediately stopped.

Looking at Lin Xian, Dai Pingbo smiled and said, "Student, do you have any questions that you don't understand? Mr. Dai, I have some doubts about this question. Let A be an mxn matrix, B an nxm matrix, then AB is an mxm matrix, what should I do next? Proof?"

Lin Xian pointed to the question and asked.

Dai Pingbo glanced at the book, looking at the densely packed answers, and couldn't help being a little surprised.

The handwriting of these answers is still dry, apparently not long after they were written.

For a while, Dai Pingbo became interested, looked at the question carefully, and couldn't help laughing: "It's normal that you can't solve it, this is a typical linear algebra problem, because mn, so r(AB)sr(A)≤n

While talking, Dai Pingbo picked up the pen and wrote down a line of formulas. "Understood!" Lin Xian suddenly realized when he read the answers in the book, and thanked him, "Thank you, Mr. Dai." "No thanks!" Dai Pingbo waved his hand and asked with great interest, "You have finished your freshman year advanced mathematics by yourself. ?" "Almost!" Lin Xian said indifferently. Wait! After self-taught freshman mathematics? The students in the classroom suddenly had black question marks all over their faces. Holy crap, do you want to be so awesome? And you are so awesome, why don't you go to Qingbei? Why do you want to come to Jincai? Is it because FD's canteen is not delicious, or is TJ's dormitory bed too hard? What's your name?" Dai Pingbo asked with a smile. "Lin Xian! Dai Pingbo asked, "Lin Xian, have you ever thought about changing your major? I think applied mathematics is very suitable for you!"