After Ye Chen obtained the life essence, he immediately entered the system space

"System, what level of enhancement can my current life essence perform on muscle strength and mental strength?" Ye Chen asked excitedly

"Host's Life Essence Points Detected: 33

1. Mental Strength: +100 (after exchange: 110/200)

(Effect: 1.5 seconds faster than the average human nerve reaction speed, 2.9% faster evasion speed)

(Gain Passive Skill Effect: Extreme Speed.)

By accelerating the response nerve acceptance efficiency of the brain, the host's avoidance efficiency of external stimuli within 30 seconds is increased by 190%, and after 30 seconds, it will enter a weak state, and the brain nerve response speed will be reduced by 40%, and the maintenance time: 30s

Note: 1. This skill can be upgraded, current level: lv1

2. This skill can only be used 3 times within 24 hours

2. Muscle strength: +90 (after exchange: 105/300)

(Effect: 5.0% increase in attack resistance and 5.0% increase in strike speed and strength compared to the average human attack)

During the subsidy period for this exchange, the required life essence will be reduced by 50% during the subsidy period belonging to the host."

Ye Chen looked at the options given by the system and fell into deep thought

"The muscle strength bonus is greater than the mental strength bonus, but the mental strength has a passive skill, which one should I choose?"

"Well, as the saying goes: no matter how good your kung fu is, you are afraid of kitchen knives; No matter how high the technology is, I am afraid of group beatings. Du Hui won't come alone in the afternoon, I guess he will call a few of his good friends who smell like, and I have to prepare for this."

Ye Chen gave the answer after thinking

"System, please help me upgrade my mental strength!"

"Escalating....

Retrieval complete, upgrading...."

An orange-red pillar of light fell from the top of the space, enveloping Ye Chen's body

Ye Chen only felt that his body seemed to be out of his control, every pore was dilated, and an unusually warm stream of heat flowed through his brain

Three minutes later, Ye Chen fell from the pillar of light and landed steadily on the ground

Ye Chen opened his eyes and returned to the library

The surrounding sounds seemed to be amplified back to Ye Chen's ears, and the sunlight sprinkled from the floor-to-ceiling windows of the library turned into countless dusty light curtains in Ye Chen's eyes

Ye Chen looked at the book in his hand again, and found that the words on the book had formed an imprint in his mind after just one glance

"It seems that this upgrade can also improve my reading efficiency, and I'm going to work hard these days to complete the task in this week's monthly exam!"

After about 2-3 hours, Ye Chen's eyes began to swell, and Ye Chen hurriedly put his hand on his temples and kneaded it

"Shhhhh It seems that you can't be too involved in reading! ”

Wei Yueying returned to the library at this time and handed the water in her hand to Ye Chen

"Don't be too tired, learn step by step, don't be too tired, it's not good for your health"

Wei Yueying said with concern

Ye Chen smiled and said:

"It's okay! Let's go back to the classroom."

"Mm-hmm, okay," Yu Yueying said softly

Ye Chen and Yu Yueying then returned to the classroom together

As soon as they entered the classroom, Zhao Dong found Ye Chen

said: "Ye Chen, come over here"

Ye Chen followed Zhao Dong to the office and came in

Zhao Dong smiled and handed Ye Chen a glass of water, and asked with a smile:

"You've been studying very hard lately, just now I saw you reading in the library, "The Mathematical Paradox and the Three Mathematical Crises", this is a good book, do you have any thoughts on it? Casual talk"

The purpose of Zhao Dong's inquiry about Ye Chen was to find out from the side whether Ye Chen cheated in the morning exam, after all, Ye Chen had risen from hovering to near the passing line to the top ten in the current class, Zhao Dong was also a little unaccurate, and he was afraid of hurting Ye Chen's self-esteem, so he asked

But Ye Chen didn't think about anything, and then said:

This book tells the history of the development of mathematics in the world from the ancient Greek era to modern times and the well-known "Three Mathematical Crises", which is rich in mathematical knowledge, and introduces the research results of mathematicians in history and more than a dozen successful mathematicians

Because of the limitations of what I learned, I could only read the paradoxes that caused the first two "math crises".

The first "mathematical crisis" appeared in ancient Greece in 470 BC. The ancient Greeks were keen to explore, the concept of ideal mathematics is deeply rooted in the ancient Greek national culture, what is ideal mathematics, simply put, everything in the world can be represented by numbers, the ratio of integers to integers is not only a number, but also the origin of the world, but also the essence of all objective things!

The above integers are rational numbers in today's terms, and the ancient Greeks believed that all numbers could be represented by the ratio of two other numbers (rational numbers), that is, all quantities are measurable, and any number is measurable!

However, when a member of the Pythagorean school studied the relationship between the diagonal of a square and the length of its sides, he proved that the ratio of the diagonal to the length of the sides of a square could not be expressed by the ratio of two rational numbers.

As soon as the results of this study were published, they caused great repercussions in the entire ancient Greek academic community, because of the discovery of non-measurable, that is, the current irrational number! This groundbreaking conclusion is the crux of the "ideal mathematics" of the ancient Greeks!

However, the ancient Greeks were not willing to give up their spiritual beliefs, they tried to solve the puzzle brought to them by irrational numbers, but it was not easy, because with the discovery of the root number 2 and the proposal of Zeno's paradox, they encountered an almost insoluble logical difficulty, which was not solved until the fall of the ancient Greek Empire, and even until the Renaissance, this difficulty is "infinity", and it also became the protagonist of the second "mathematical crisis"!

Irrational numbers are "infinite non-circular" decimals, since it is infinite, and it is not cyclical, and there is no law, so can it be regarded as a "number", since the number after the decimal point is infinite and can never be counted, then it is impossible to know all the decimal places, and it is impossible to know the specific value of rational numbers, so is it still a "number"?

Since then, the ancient Greeks' mathematical focus has shifted from algebra to geometry, because geometric figures can cover up the logical difficulties of "infinity", which also created the birth of Euclid's "Geometric Originals", and also created a series of geometric theorems in middle school mathematics textbooks. However, the first "mathematical crisis" caused by irrational numbers was not solved until the 19th century!

I believe that knowledge learning must not be reduced to one point, and it is necessary to strengthen the reference to other different academic disciplines, so that we can integrate the whole thing! ”

"Uh-huh, nice! I am very pleased with your progress and hope you will do your best! This high school junior exam is actually a thorough exam for a famous university, I hope you will work hard! ”

Zhao Dong said with a smile

After Ye Chen returned to the classroom after thanking him, considering the gambling appointment this afternoon, he didn't listen to anything in the four classes in the afternoon because of his nervousness

The school bell rings at 6:00

Du Hui stood up, walked to Ye Chen's table, and said mockingly:

"What? My big man Ye, let's go! ”

When Wei Yueying heard it, she hurriedly walked over and said hurriedly

"Don't embarrass Ye Chen, I'm not looking for any job, for the sake of our classmates, you don't have to trouble Ye Chen anymore!"

Ye Chen smiled and pulled Yu Yueying to his side, and said to Yu Yueying with a smile

"Yingying, this is our man's business, don't worry!"

"But..."

At this time, Ye Chen sneered at Du Hui and said

"Let's go"

Du Hui took Ye Chen to the open space behind the No. 4 dormitory building of Jianghai City's Jieyun Middle School

The school basketball court was planned to be built here, but due to the lack of funds, the construction plan was postponed until the school gymnasium was built with government investment, and this vacant land has been abandoned until now

"Well, it's indeed an excellent place to kill people, and it's a good place for them to choose!"

Ye Chen looked at this clearing and smiled secretly in his heart

At the same time, three people who were wearing school uniforms but did not have the slightest bookish anger that students should have sat on the ground

When they saw Du Hui coming, they quickly stood up

"Brother Du, is this kid?? Don't worry, we'll do a good job," said one of the leaders

Du Hui laughed wildly at this time:

"Ye Chen! Aren't you very capable of fighting? I've lived so long that no one has beaten me except for my parents, you can go with peace of mind today, I will take care of Wei Yueying in the future.... Ha ha! ”

Ye Chen didn't say much, strode towards Du Hui in silence, and before Du Hui could react, his left hand grabbed his collar with lightning speed, hooked his ankle forward with his left foot, and tripped hard to the right, Du Hui's center of gravity instantly lost balance and fell to the ground

Ye Chen then picked up Du Hui's mobile phone on the ground, then pulled Du Hui's left hand to unlock the screen, quickly found the phone marked "Dad" in the address book, and dialed it

It took Ye Chen about 7~9 seconds to complete these operations, and Du Hui was still covering his right shoulder on the ground and wailing

The three boys were stunned for a few seconds, as if they didn't expect Ye Chen to make such a quick move, and then ran over from where they were standing just now with a shout

"Brother Du, don't be in a hurry, brother will abolish him!!"

Du Hui was stepped on his shoulder by Ye Chen with his left foot, and he couldn't get up for a while, he kept waving his hands and shouting at the same time:

"Ye Chen, I'm xx your mother, I'll call my dad tomorrow to let you go to prison, you rob me of a woman, it's only right for me to beat you, where is you qualified to compare with me, even if Wei Yueying likes you, you have to kneel and give her to me, if you don't leave an arm today, you don't have to go anymore.... Yes....!!! ”

Ye Chen increased the force on his feet and said

"Du Hui, you really think highly of me, Ma Yi from Class 14 was broken by you looking for someone to break his leg, I heard that you still have a relationship with his girlfriend, and she also went to have an abortion for you, you are a good means!"

After hearing this, Du Hui thought that Ye Chen was afraid of him, and then said:

"You still know a lot, tell you, as well as Zhao Kui, Chen Hua, they are all made up by me to ask my father to put them in the bureau, a few beatings, who of them dares to say me, even if I am green, I have to endure the broken leg and foot, if you don't kneel down and beg me now, I will let you follow in their footsteps..."

As soon as Du Hui's words fell, a roar that Du Hui was extremely familiar with, but at this moment he didn't want to hear at all, came out of the mobile phone in Ye Chen's hand

"You! You bastard! Come back to me quickly, if you can't get home in half an hour, explain it to me, and you should be prepared to be responsible!!! ”

Du Hui got up from the ground tremblingly, and snatched the phone from Ye Chen's hand on his knees

"Dad, no! No! You listen to me...."

"Doot toot...."The phone has been hung up

Du Hui sat on the ground with a dead face and stayed for a moment

Then he got up and ran towards the school gate