Li Dan was full of curiosity and opened the cover of the book "Mathematical Principles of Natural Philosophy".

Of course, the book is also translated into Chinese.

Fortunately, there is a big difference between natural science books and literature books, and even if they are translated in Chinese, it will not cause a big gap in the reading experience.

The book begins with a definition and explanation of the concepts used in the book.

What is "force"? What is a "celestial body"? And what are mechanics, motion, quantities of matter......

Li Dan watched it for a long time, but he didn't see the slightest knowledge related to mathematics, all of which was common sense in physics.

Was Newton selling dog meat with a sheep's head?

Or did the Chinese translator make a mistake?

This kind of ridiculous thing shouldn't be in such an authoritative book of natural science, right!?

No, there must be some reason! Or rather, this book must have something to do with mathematics!

Li Dan continued to look down patiently, and when he saw the first volume of "On the Movement of Objects", he gradually discovered something interesting, and the whole person was quickly attracted to it.

"The cannonballs were fired on the top of the mountain, and the cannon power was insufficient, and the cannonballs flew for a while and then fell to the ground in an arc. If the cannon is powerful enough, the shells will circulate the earth's surface ......"

In this volume, when discussing the motion of objects, the hypothetical experiments presented discuss the motion of objects in various limit states, all of which cannot be simulated in reality or in the laboratory.

However, this extreme sports experiment can be proved by mathematical calculations!

It is even possible to summarize the laws of the motion of objects under the gravitational force under different conditions!

This method of mathematical calculation and analysis was first invented by Newton and was called the calculus method.

Li Dan suddenly had a flash of inspiration in his mind, and quickly turned to the preface of the book, and found Newton's original intention of writing the book "Mathematical Principles of Natural Philosophy".

"Since the ancients believed that mechanics was the most important thing in the study of natural things, and now people abandon their physical shapes and hidden properties and try to explain natural phenomena by mathematical laws, so in this book I also devote myself to using mathematics to explore related philosophical issues."

After a long time, it turns out that mathematics is the basic discipline and an important tool for physics research?

Why is it not reflected in high school textbooks at all?

Also, why wasn't calculus taught to students in high school as a good way to solve physics problems?

But let high school students stupidly use the most basic, most efficient methods to solve physics problems all day long?

This practice is like human beings who have mastered the technical ability of thermal weapons, but have to force themselves to learn from primitive people who drink blood and use wooden sticks and stones to hunt?

Isn't this special thing embarrassing yourself?

Li Dan looked at the book "Mathematical Principles of Natural Philosophy", and at the same time found the book "Introduction to Calculus and Mathematical Analysis" from the mathematics bookshelf, and began to learn some knowledge of introductory calculus.

Just as he was completely caught up in this left-to-side, overwhelmed reading experience, the Nokia phone in his trouser pocket screamed at an inopportune time.

In the silent library, this voice seemed to be a thief, which really scared Li Dan.

"Dandan, you're not in the dormitory? Where did you go again? ”

On the other end of the phone was Da Chun's heartless, carefree voice.

Although every time in the examination room, Da Chun would frown, his nerves were tense, and the whole person looked miserable.

However, as soon as he gets out of the examination room, no matter how well he does the exam, how many questions he doesn't even answer, he will leave all his troubles behind, and the whole person will return to a relaxed state.

"I'm in the school library......

Li Dan glanced at the time on his phone and startled himself.

Damn, doesn't that feel like much? Why is it already past 5:20?

More than an hour has passed? Not too fast!

Reading a book is really an addictive thing, it's like lying in bed and playing with your phone, it's too time-consuming!

However, interesting books can seem much cooler than playing on a mobile phone.

The most important thing is that every time I finish playing with my mobile phone, I will lie on the bed exhausted, and then I find that my mind is empty, and I can't remember what I just did, and the whole person is like losing the memory of that period of time.

How so? There is a strong feeling that I am decadent, full of guilt......

However, after reading the book, it was a completely different feeling.

The whole person is like having just had a brain massage, and the whole body feels transparent and refreshing from the inside out, and the spirit is also doubled!

"Little sister, I want to borrow these two books."

Li Dan smiled slightly and handed the two books to the young girl at the front desk.

"Who's your sister......"

The girl glanced at him, obviously feeling that she was a little humiliated by Li Dan's call "little sister", and immediately wanted to draw a line with him, it was best not to get along with each other!

"I don't see it...... I'm sorry, aunt ......."

Li Dan smiled silently, he was not a master who was willing to suffer.

The girl stood up as if her tail had been stepped on, and glared at Li Dan angrily: "I just got in my early 20s...... Who do you call Auntie? ”

"Then what shall I call you? Little sister? ”

Li Dan looked at each other helplessly.

The girl's pretty face was swollen red from anger, and she pointed to the badge on her chest and said coldly: "My surname is Wang, and I am the administrator of the library, you should call me Administrator Wang!" ”

"Wang Luoji."

Li Dan also instantly saw the life on the other party's badge.

Good guy, there are three "kings" with names and surnames!

As soon as he spoke, Wang Luoji had already scanned the book that Li Dan wanted to borrow into the library's system, and the status was changed to "borrowed", and the period was one week.

However, she didn't mean to return these two books to Li Dan, but looked at him angrily, as if waiting for something.

People have to bow their heads under the eaves, Li Dan looks at the other party's posture, if he doesn't accept it today, these two books will definitely not be able to be borrowed.

"Okay, I'm sorry for you, Wang? Can you give me back the book now? ”

"Humph! That's pretty much it! Ah, the book is for you! Remember to keep it well, don't lose it, don't damage it, offenders will be fined 5 times......"

A smug smile appeared on Wang Luoji's face, and he returned the book to Li Dan, and was about to tell him about the rules for borrowing books in the library, but found that the other party had already fled.

"This kid is not good-looking, and he would borrow two books of such a tall one?"

Wang Luoji looked at the titles of the two books that had just been borrowed out in the library system, and was a little dazed: "Hmph, it must be a dog with a green onion in his nose, pretending to be an elephant with me!" Also, this kid is oily and smooth, he doesn't call me Administrator Wang, but he is referred to as 'Wang Guan'? ”

"Wang Guan? Hee-hee, that title sounds pretty cool! ”

Wang Luoji stretched his waist and glanced at the time on his phone, it was almost half past five, and it was time to get off work.

"Wang Guan? Wang Guan? Management! Is he jokingly calling me a webmaster?! Okay, this stinky boy! I won't spare you when I return the book! ”