Obviously, skill alone is not enough, but Xu Qilin wants to give her a chance, which also includes pity.

There were many skilled craftsmen in ancient China, but the inheritance and development of science and technology were a big problem. From Xu Qilin's point of view, "science" and "technology" should be understood separately, scientists and craftsmen, science and technology.

There were many inventions and creations in ancient China that even influenced the development history of the entire world. However, it lacked basic theories and more in-depth research.

To put it bluntly, many inventions are accumulated by experience, and the inventors are not clear about their principles, so it is naturally difficult for people to continue to develop on this basis. The so-called "knowing the truth" and not knowing why, that is.

Moreover, the profession of scholars, farmers, industry and commerce, and "working" had a very low status in ancient society. Most of them were bankrupt farmers who lost their land and had to make a living.

Craftsmen have a low social status, and their inventions are not valued, and their principles are not clear. They are not only difficult to develop continuously, but are more likely to be lost.

For example, mechanics was applied very well by ancient people and invented many tools to cleverly apply mechanics. However, there was no special book, and mechanics knowledge was scattered in various books.

It can be seen from this that in ancient China, there was more experience than theory, and more instrument manufacturing than mathematical summary.

Although China's scientific and technological level was ahead of the world as a whole until the Ming Dynasty, it was already far behind in basic theory.

At that time, Newton had proposed three major laws of motion and gravity. "The Origin of Geometry" was compiled by Euclid in the third century BC, and became the most widely circulated book in history, second only to the Bible.

It is not about advocating foreign countries, or pretending to be self-deprecating, nor about national feelings. Xu Qilin only feels that even if he earns wealth that is as rich as a country, he is better to create "Mechanics" and "Geometric Originals". That is a great move that benefits the present and the future.

It is not shameful to take it as a wise man, and self-esteem is a chronic disease that hinders development and progress. Fortunately, the Tang Dynasty did not have so many bad habits, and His Majesty Li Er wanted to send someone to Zhongtianzhu to learn sugar making, which is an example.

Of course, Xu Qilin knew that the road had to be walked step by step and the meal had to be eaten one by one. If you want to carry out conscious, planned and organized scientific research activities, you should not rush it.

"Elementary Mathematics" was printed, and with "Geometry" and "Algebra", it was considered to summarize the constant mathematics. Mathematics is the basis of all sciences, which was said by Leonardo da Vinci, one of the peerless geniuses.

The door was gently knocked, interrupting Xu Qilin's thoughts. What surprised him a little was that Helan Chushi walked in.

Why? I'm not satisfied with being beaten by myself, so I'm here to find someone to beat me?

Helan Chu Shi saluted respectfully and called "Xu Cheng". Seeing that this guy seemed to have become obedient, Xu Qilin had to pretend on the surface.

"Please sit, please sit." Xu Qilin couldn't guess what this guy was going to do, so he was just a polite person. After giving up his seat, he ordered the servants to serve tea.

Helan Chushi first casually asked about Dayingku’s work requirements and then came to the point.

"Just just now, Xu Cheng said that Your Majesty trained the backwards, let me deeply understand and be grateful to God's kindness, I agree with it!" Helan Chushi bowed to the void and said with emotion: "I want to record the earnest expectations in Your Majesty's edict on paper, frame them, hang them in front of the desk, keep them in mind, and encourage them all the time. I wonder what Xu Cheng thinks?"

Xu Qilin blinked his eyes and thought to himself: I made up all the training of the backwards, and I don’t have much anticipation. Are you thinking too much?

Seeing that Xu Qilin didn't say anything, Helan Chushi hurriedly added: "Your Majesty doesn't know who will be sent to serve as deputy chief, is he a young and backward? But he is very confident about Xu Cheng. Although the lower official was summoned to the Eastern Palace to receive the imperial edict yesterday, he was confused after drinking and recorded the content of the imperial edict. It is actually a crime of disrespect. If Xu Cheng is willing to forgive, he dares to ask the lower official to accept it. He must remember it firmly and dare not forget it."

Xu Qilin pondered for a moment, feeling that even if he was charged with this crime, he would not be able to do anything to Helan Chushi. There were only two of them in the house, and there was no circumstantial evidence! Helan Chushi's meaning seemed to be suspicious of the content of the edict.

Li Chengqian wasn't that bold, right? He dared to tamper with the edict, although this was not a formal imperial edict, but was transferred by the eunuch.

It’s okay to let you see it. There is no way to support the backwards, but that’s what His Majesty Li Er means. That’s what I think. If you have the ability, go and ask Your Majesty. If you give you a hundred courage, don’t dare!

Xu Qilin took out the edict from the file folder of the bookcase and handed it to Helan Chushi, and was also puzzled: Has this girl never read the edict?

Helan Chushi took it respectfully, looked carefully, his expression calmed down for a moment, but instead returned to normal, he respectfully returned it.

"Thank you, Xu Cheng, I understand everything." Helan Chu Shi bowed and said, "Don't disturb Xu Cheng's work, I will say goodbye."

"Previous Deputy Chief Helan walked slowly." Xu Qilin gave it in a fake way. Looking at Helan Chushi's back, he muttered in his heart: What does this guy understand? You should have understood it a long time ago!

Helan Chushi returned to the office, closed the door, his face turned gloomy, and sat in the chair and began to think.

Obviously, Du He made a false edict and even His Royal Highness the Crown Prince was suspected.

To put it bluntly, I was deceived and fooled. I guess they wanted to think that they had obtained the Shangfang Sword and had the power to supervise, and were arrogant and rude to Xu Qilin to cause conflict.

Fortunately, I was cautious enough. If I was angry just now and had some supervision power to make a statement, it would be terrible if Xu Qilin issued an edict.

Helan Chushi gritted his teeth. Not to mention the Eastern Palace, his father-in-law was considered to be of high status and powerful. Xu Qilin did not give him face and would definitely be resentful. But being deceived like a fool is even more hateful.

The Eastern Palace, or you, Du He, are not in harmony with Xu Qilin, and are in trouble for him and treat me as a gun, which is too sinister and dirty.

But what can you do? Go to the East Palace to explain it clearly, but you will offend Du He completely, and you may also anger the prince. Even if you don’t deceive you, the East Palace and Xu Qilin have a rift and want you to go against him and cause trouble for him, don’t you have to obey your orders?

With a long sigh, Helan Chushi felt that this was not as easy as he thought.

It is better to be in charge of the current official position. Xu Qilin is obviously favored by the holy people. It is not easy to move out of the Eastern Palace. If you want to deal with yourself, as long as you are justified, there is nothing you can do about the Eastern Palace, right?

………………………….

"Xu Lang hasn't returned to his house yet?" Chen Mengwei hesitated and glanced at the brother next to her, as if asking for his opinion.

Chen Jingxuan thought for a while and said, "Sister, why don't we wait for a while. Seeing that at this time, Xu Cheng is coming back soon."

When the manager of the mansion heard this, he hurriedly asked inside and asked him to go to the hall, and ordered his servants to serve tea.

"You are busy with yours, don't be so polite." Chen Mengwei said.

"Miss Chen and the little husband sat down for a while, and the villain went to invite Scarlett to accompany him." The manager said with a smile: "This is more convenient."

"Then I'll be in trouble." Chen Mengwei thanked him.

Since Chen Jingxuan was recruited as a student by Dayingku Mathematics, the Chen family bought a small house in Jing'anfang and often gave some things to the Xu Mansion. It was not so expensive, like live fish in buckets, fresh vegetables grown by Chenjiazhuang households, and a fat pig, which meant to express gratitude.

After a while, Chen Mengwei also met several people from the Xu family. She had met Scarlett in the village and was quite familiar with her.

There are usually no female guests in the Xu family, and no female relatives in the house come to entertain him. Chen Mengwei has a low status. Although Scarlett is a maid, everyone knows how her husband is spoiled. It is reasonable to be half of the hostess for the time being.

Time was not long, so Scarlett came to the hall. After a few words, he chatted with Chen Mengwei.

"It's Jingxuan who is confused about mathematics. Today, Xu Cheng didn't go to the school hall, so he thought about coming to the mansion to ask for advice." Chen Mengwei explained the purpose of the trip, "I didn't want to bother Xu Cheng, but I was afraid that the more I fell, the more I fell."

"What are you doing?" Scarlett blinked and said, "Alang just teaches my slaves to write numbers and calculate accounts, and I don't know if it's the same thing."

Chen Mengwei hurriedly greeted her brother, "Jingxuan, bring what you don't understand and let Scarlett see."

Chen Jingxuan is better than Scarlett, and he doesn't think this little girl will be better than him. But my sister has already said that if he doesn't take it out, he will look down on Scarlett.

Scarlett was quite modest and waved his hand and said, "I can't do it, so I'd better ask Alang for advice. Look at the time, I'm coming back soon."

"Can you know, just take a look!" Chen Mengwei smiled and took the notebook from her brother and handed it to Scarlett.

Scarlett had to take it, looked at it for a while, and said, "This must be solved with unknown numbers, right? Alang told me the interesting question of chickens and rabbits in the same cage, which seemed to be similar to this."

"Unknown numbers?" Chen Jingxuan didn't understand why, in fact, there were some in the textbooks, but he hadn't read them yet.

The concept of unknown numbers has long existed in China. In the "Nine Chapters of Arithmetic" written in the early Western Han Dynasty, there is a problem of multiple equations. However, the concept is implicit in the placement of calculation pieces without resorting to written records.

Scarlett nodded and said, "I only say that I can solve the problem with the chicken and rabbit in the same cage. Maybe it will be helpful to Chen Lang."

Solution: Assuming that rabbits have x, then chickens have (35-x)... Solution: x=12...

Chen Jingxuan saw Scarlett write the problem-solving steps on paper, from confusion to Qingming. He didn't need to calculate the pieces to represent unknown numbers, but just replaced them with symbols on the paper, so he could see it at a glance.

Is ancient Chinese mathematics powerful? Liu Hui, Zu Chongzhi, Qin Jiushao, etc. Until the end of the Yuan Dynasty, China's mathematical level was ahead of the world.

But traditional mathematics also has fatal flaws, which is the lack of a completely independent written mathematical language system. To put it bluntly, it means the lack of perfect and unified mathematical symbols.

For example, if the decimal point is used to represent pi, it is 3.1415926. Without it, it is expressed in ancient Chinese books as: three zhang, one foot, four inches, one minute, five centimeters, nine millimeters, two seconds, six seconds.

This is not just a cumbersome problem, but also makes ancient math books obscure and difficult to understand, and the methods and steps of solving problems are unclear.

More importantly, it will cause traditional mathematics to encounter bottlenecks in its development and cannot develop to a more abstract and advanced stage.

Because of this, in ancient China, you had to learn mathematics first and learn well before you could pick up a math book to read it. Otherwise, if you can't even understand the questions, or if you understand them wrongly, how can you solve the problems correctly?

Xu Qilin's "Elementary Mathematics" basically solved these problems, and suddenly established a mathematical symbol system that has gradually formed and improved after thousands of years of development.

This makes mathematics clear in form at a glance, concise and clear, and expresses mathematical theories and arguments easily understandable, greatly reducing the cultural level and age requirements for learning mathematics.

"It turns out that symbols can be used instead. I think someone hasn't read this, so I'm really not serious." Chen Jingxuan bowed to Scarlett, "I thank you Lady Li for helping you."

Scarlett hurriedly said humbly: "I just read "Elementary Mathematics" early, and there is Professor Alang, but he is very stupid and feels ashamed. How dare I solve any confusion for Chen Lang?"

"Li Niang doesn't need to be modest, so won't Jing Xuan suddenly understand?" Chen Mengwei smiled and said, "You are Xu Cheng's personal disciple. I don't know how many people are coming to ask for advice alone!"

Ah?!Scarlett waved his hand and shook his head hard, and said, "Don't say that, I'm stupid and lost Alang's face."

Seeing Scarlett's anxious look, Chen Mengwei couldn't help but laugh and said, "How could it be? Li Niang is a girl, and she is so old, so she is so good at math. She can only add color to Xu Cheng!"

Chen Jingxuan also gave a few compliments, but Scarlett just shook his head and refused to spread the word.

As he was talking, Xu Qiqiu walked in, Chen Mengwei and others hurriedly got up to greet him.

Xu Qiqi hurriedly returned the gift and also talked to Xu Qilin about something. Seeing that Xu Qilin was not here, he was polite and turned around and left.

After sitting for a while, Xu Qilin had not come back yet. Seeing that it was getting late, the Chen brothers and sisters also said goodbye.

…………………

Minister of Personnel, Duke Chen's Mansion.

When Hou Junji was young, he was ignorant, but he was quite exaggerated, claiming to be very brave. Later, he followed Li Er to fight south and north and made many military achievements. During the Xuanwu Gate Incident, because he tried his best to persuade Li Er to make a decision and make plans, he was highly valued by His Majesty Li Er, and became a high-ranking official and promoted the title.

Hou Junji, who was born in the army, was able to study and study after obtaining high-ranking officials and participating in the government affairs with scholars and officials. He was praised by Wei Zheng and others, and praised him as the prime minister.

Therefore, after Hou Junji was appointed as the Minister of Personnel, he participated in the selection of officials and customized assessment questions. His performance in work was still remarkable and more competent.

It is beyond doubt that Hou Junji's talent is capable of becoming a general in martial arts and literary talent. However, Hou Junji's personality and character have very fatal flaws.

First, he has a poor character and does not know how to be grateful. He complains and hates him if he is not satisfied. He once learned military tactics from Li Jing, but he complained to His Majesty Li Er, saying that Li Jing "will never show his ministers when he is in vain." This is to rebel.
Chapter completed!