I Just Want to Be a Salted Fish in Peace

　　In the eyes of the whole person, there is nothing but books.

　　Even Ling Xiaoyu around him was ignored by him. .

Chapter 85

　　[Absolute focus] The state after opening is very magical.

　　Lin Xian also enjoyed this state very much, as if he was swimming in the ocean of mathematics, constantly absorbing knowledge.

　　Absolutely focused skill effect, extremely powerful.

　　Memory +100%

　　Learning Ability+100%

　　Perception +50%

　　In addition, his own IQ is not low, in this case, there is no difficulty in the freshman and high school textbooks in front of him.

　　Of course, this is also related to the fact that the knowledge points of the freshman and high numbers are not so esoteric.

　　The high mathematics in the freshman year is actually not difficult. Most of the knowledge points are just the expansion of high school mathematics.

　　If your math scores in high school are not bad, then you don’t need to pay too much attention to high school math, and you can pass easily. If you are a little more serious in class, it is not impossible to get [-] to [-] points in the test.

　　But in the second 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 exam. As for the high score of 14, 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 am I?

　　where am I?

　　what am i doing?

　　……

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

　　Time passed by minute by minute.

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

　　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.

　　It has to be said 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's really amazing!"

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

　　What should I 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, Ling Xiaoyu's mouth turned up 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, B be an nxm matrix, and mn, 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 sub-sections, each of 45 minutes, with a 15-minute break in between.

　　Glancing at Professor Dai Pingbo, Lin Xian's eyes lit up, and he quickly stepped forward with his 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, "Classmate, 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 and B be an nxm matrix, then AB is an mxm matrix. How do I prove it next?" Lin Xian pointed to the question and asked.

　　Dai Pingbo glanced at the book and was a little surprised when he saw the densely packed answers.

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

　　For a time, Dai Pingbo became interested, looked at the question carefully, and couldn't help but smile: "It's normal that you can't solve it, this is a typical linear algebra problem, because mn, so r(AB)≤r(A)≤n <m. So det(AB)=0 understand?"

　　While talking, Dai Pingbo picked up the pen and wrote down a line of formulas.

　　"understood!"

　　Lin Xian suddenly realized the answer in the book, and thanked him, "Thank you, Mr. Dai."

　　"you are welcome!"

　　Dai Pingbo waved his hand and asked with great interest, "Have you finished self-study in freshman mathematics?"

　　"Almost!" Lin Xian said calmly.

　　and many more!

　　Self-taught freshman high school?

　　The students in the classroom suddenly had black question marks all over their faces.

　　Holy crap, do you want to be so arrogant?

　　And you are so awesome, why don't you go to Qingbei?Why do you want to come to Jincai?

　　Is FD's cafeteria bad, or is TJ's dorm bed too hard?

　　So angry!

　　"What's your name, classmate?" 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!"

　　"Mr. Dai, I have no idea of ​​changing majors yet. Mathematics is just a hobby." Lin Xian politely refused.

　　Yes, it's a hobby.

　　After just half an hour of problem solving, Lin Xian developed a strong interest in mathematics.

　　Especially after solving a problem, the sense of achievement is very refreshing.

　　So, he decided to incorporate mathematics into his hobby.

　　God TM hobbies!

　　At this time, Qi Zhenzhen and others looked at him a little differently.

　　Seeing his rejection, Dai Pingbo was not disappointed.

　　In fact, Dai Pingbo himself knows that mathematics is an extremely unpopular major, not to mention the mathematics majors of two colleges such as Jincai. It is difficult to say whether they can find a job after graduation.

　　Thinking of this, Dai Pingbo nodded and said, "It's not bad to regard mathematics as a hobby. You can skip all of my classes this semester. If the final exam is lower than 90, then don't blame me."

　　What the hell!

　　Hearing this, the students in the classroom let out a sigh of relief and looked at Lin Xian with envious eyes.

　　The professor opens his mouth, and he can skip class in the future!

　　This is too cool! .

Chapter 86

　　Lin Xian closed the textbooks and said with a smile, "After reading the advanced math textbook for freshman year, I don't know what to read. Can Mr. Dai recommend a few books?"

　　Dai Pingbo pondered for a moment, then recommended: "I recommend you to read Zhang Zhusheng's "New Lectures on Mathematical Analysis" and Xu Lin's "Mathematical Analysis", especially the book "Mathematical Analysis", if you can put the knowledge in the book If you understand all the points and questions, it proves that you have mastered advanced calculus."

　　"At that time, I will recommend the next book to read based on your situation."

　　"Okay, thank you Mr. Dai!" Lin Xian said with a smile~.