Douluo: I am Bibi Dong's guardian sword!

When Hua Luogeng heard this, he was thoughtful, and his evaluation of Yu Hua was higher in his heart, and his face was serious: "Scientific research and progress cannot be rejected, but what should be the answer to Japan's current threat?"

"Little Japan, how many days of madness?"

Yu Hua said: "A small place dares to give birth to the heart of swallowing China. If it weren't for the saying of measuring China's material resources and connecting with the country's favor, how could it dare to make a fuss? It is a fact that China is weak, but one day, Japan will be dressed up like a little girl, and the students firmly believe that."

Little Japan, how many days of madness?

The words exploded in his ears like thunder on a sunny day, Hua Luogeng was stunned for a second, and the next second, the whole person only felt that the blood on his body seemed to heat up and flow faster.

The tone is calm, not exciting, but full of power, which makes people feel refreshed after listening to it. Since the September [-]th Incident, Hua Luogeng is the first time to hear such disdain for Japan's powerful words.

Hua Luogeng shook his head and took a deep breath. He had to admit that Yu Hua did persuade him.

"Yu Hua, call me a professor in the future. For internal and external purposes, you should be my first direct disciple of Hua Luogeng." Hua Luogeng took a deep breath, stared at Yu Hua, and said straightly.

"Student Yu Hua, thank you professor." Yu Hua was overjoyed and bowed to Hua Luogeng.

"Sit down, drink the ginger soup,"

Hua Luogeng smiled and motioned Yu Hua to drink the ginger soup, then got up and walked to the bookshelf.

Yu Hua didn't hesitate, sat down obediently, picked up the steaming ginger soup, slightly hot, and drank it in small sips to get rid of the chills on his body.

When Yu Hua was drinking the soup, Hua Luogeng carefully selected four thick and concise textbooks from the bookshelf, and solemnly placed them on the surface of the desk——

Derivatives and Limits,

"Theory of Calculus",

"Theory of Real Variable Functions",

"Mathematical Analysis".

These four textbooks are all English-language textbooks. When Yu Hua saw it, it was as if he had seen the most precious jewels.

If the anthology written by the faculty is the top dragon slaying technique in the field of human civilization struggle, then the four English-origin textbooks in front of you are the dragon slaying technique in the field of human civilization mathematics.

These four English textbooks, which are completely at the advanced mathematics level, are as precious as the treasures in fantasy novels in the extremely barren mathematical soil of the Republic of China.

"These are four original English textbooks, which I brought back from abroad. They are more difficult than Tsinghua's current mathematics textbooks. You are an extremely rare mathematical genius, or a science genius. Take these four textbooks back and read them first. When you come to something you don’t understand, write it down. From now on, come to Tsinghua University every Saturday and Sunday, and I will teach you one-on-one. I will say hello to the Fourth Middle School.”

Hua Luogeng sat down and looked at Yu Hua: "The first year of foreign universities is mainly based on calculus, and calculus is also the core of the entire advanced mathematics. Elementary mathematics studies constants and uniform variables, and advanced mathematics studies non-uniform variables, which is the real mathematics. Research lays the foundation, since you have chosen to major in mathematics and want to master the sharpest tool, then you must be prepared to study hard.”

As a man standing at the top of the world mathematics pyramid, Hua Luogeng naturally knows the difference between elementary mathematics and advanced mathematics.

Advanced mathematics is the foundation of mathematical research. Compared with the future mathematics, it is still a process of laying the foundation.

After high school mathematics is over, real mathematics has just begun.

"Students are always ready." The one-on-one words echoed in his mind, and Yu Hua felt as if his breathing was shaking. Resisting the excitement, he nodded heavily.

One on one!

One-on-one tutoring from Hua Luogeng.valley

If this is put into the future education and training market, will it explode directly?

Looking at Yu Hua, who regarded advanced mathematics as a treasure, Hua Luogeng couldn't help laughing. I don't know how many science students in Tsinghua Garden felt a headache: "How long have you taken leave?"

"One day." Yu Hua replied truthfully.

Hua Luogeng arranged: "Then I'll sleep here tonight. It's late at night, it's not safe to go back alone, so I can read a book by the way."

Yu Hua nodded, but did not refuse, suddenly remembered a situation, and asked, "By the way, Professor, do the four textbooks need to be kept secret?"

"No, ordinary people can't understand it, and people who can understand don't need it. This is just to lay the foundation for you, and the cryptography you learn in the future needs to be kept secret." Hua Luogeng shook his head gently.

Confidential?

Advanced mathematics, which is purely a basic category, does not need to be kept secret at all. Only those involving higher-level cryptography research are things that need to be kept secret.

Any progress in the field of cryptography will lead to great changes in the field of modern intelligence and communication. Whoever has a deeper level of research on cryptography will have a way of communicating confidential information and can reverse the plaintext information of the other party.

"Students understand." Yu Hua's eyelids twitched slightly when he heard the term cryptography, but he didn't ask aloud. He knew the importance of cryptography.

Cryptography has become an important branch of modern mathematics research. It is listed as a special separate subject abroad. It is a comprehensive applied mathematics, which consists of number theory, finite mathematics, algebraic geometry and mathematical logic.

If Goldbach’s conjecture, the crown jewel of number theory, has more theoretical significance than practical application significance, and even makes people unable to see any application significance, then cryptography based on number theory is a purely applied mathematics discipline.

The importance of passwords cannot be overstated.

As long as communication is involved, no matter whether it is radio communication or information exchange through various channels, cryptographic applications will be involved.

Of course, Yu Hua is well aware of cryptography-related knowledge, which is far from what he can touch at this stage, and his strength is not enough to touch this high-end discipline.

"You read here first, I'll ask your mistress to make the bed and get up for class tomorrow morning." Hua Luogeng saw that Yu Hua knew what it means to be in moderation. With a stronger smile on his face, he nodded and got up and left.

"Thank you Professor." Yu Hua got up and thanked.

"Bang!" Hua Luogeng waved his hand and walked out. After the door was opened, it closed gently, and the study became quiet again.

start to learn.

Yu Hua adjusted his self-state, and his eyes fell on the four advanced mathematics textbooks on the desk. His heart was full of anticipation. He took the lead in picking up the first "Derivatives and Limits" compiled by Cambridge University, turned the first page, and quickly Immerse yourself in the mysterious ocean of mathematics.

If calculus is the basis of mathematical research, then the derivative is the calculation tool of calculus, and the limit is the cornerstone of calculus.

Calculus without limits is like duckweed without roots. With calculus with limits, it is a cornerstone for the establishment of the entire modern human civilization.

From Cambridge University's "Derivatives and Limits", what it tells is no longer the basic knowledge points of high school, but the content of the university level. Fortunately, with the extremely solid elementary mathematics foundation, Yu Hua can easily understand the knowledge and learn from it. Essence.

At this moment, all the troubles and confusions, all the external pressures disappeared, and only the brilliance of mathematics was shining.

In the room, only the sound of flipping books was left unhurriedly.

……