Jia Xian looked at the various triangles on the blackboard, rubbed his forehead and said in a deep voice: "It's not difficult to say these contents. I have studied Pythagorean art for many years and rarely considered it before. But now I have changed to this new number, and add, subtract, multiplication and division are the same novel symbols. After a few hours, I feel dizzy. The deputy envoy, why not just do this today, and wait until I get to see this new set of numbers and symbols proficiently before making sense."

Xu Ping had no choice but to agree: "I can't do this even if I'm anxious, so I must calm down and do it steadily. In a few days, I may have to go out of the capital. If I don't have time, I will tell you first. Just write it down first. If you have time, I will think about it slowly. The content is indeed not difficult, the only thing is the symbols, just be familiar with it."

In the past, China's arithmetic system has always relied on calculation and calculation, and most of the calculations are explained based on calculation and composition. People who are unfamiliar will look like people who don't understand chess and are confused when they watch chess scores.

Xu Ping once worked hard on calculation sheets in Yongzhou. When he became familiar with them, he felt that they were far less convenient than the mathematical symbols in his previous life. This is a reasonable thing. I don’t know how many mathematics he learned in his previous life and that system has been sorted out by everyone. Whether it is convenient, easy to learn or scientific, it is much more advanced than the elementary tool of calculation sheets.

Now to cultivate mathematical talents, this mathematical system must be promoted first. This item alone will not know how many talents it will create, and it will allow them to move the mathematical system forward a big step forward.

Generally speaking, Jia Xian and others are no less than Xu Ping’s knowledge of mathematics than Xu Ping’s previous life, and their specific directions are far more than those in high school. The research on certain problems has reached the level of college or above. After mastering the new mathematical system, they have gradually surpassed the level of junior high school mathematics, and basically mastered what they learned in high school in their previous life. They have made greater progress in the direction of geometry, number theory and calculus. These directions are accumulated by mathematicians in previous life, and they have thoroughly studied many concepts.

Jia Xian and his senior brother Zhu Ji also focused differently. Jia Xian mainly studied triangles and number theory, and did not involve irrational numbers and differentiation at all. This was his own deliberate choice. Zhu Ji followed Liu Hui and put more effort into the differentiation direction, so he was a little weaker in geometry and number theory.

Based on the characteristics of the two, Xu Ping divided the labor.

Zhu Ji changed to do data statistics and analysis, which was the most useful practical mathematics for the three departments. Although Xu Ping himself remembered some formulas and conclusions from his previous life, it was not systematic, and he even didn't forget some practical content in his previous life. In the process of studying and learning with Zhu Ji, he improved this part again.

Jia Xian was arranged by Xu Ping to do elementary algebra of geometry and system, which was another aspect of the knowledge that officials of the Three Divisions needed to master. At this time, the court collected agricultural taxes based on the number of land acres, and measuring the number of land acres requires geometric knowledge.

Xu Ping could not imagine how difficult it would be to measure farmland in his previous life. In fact, there were very few talents who could measure land in this era. Guo Zi's method of using square fields was a rare talent among officials.

If you can accurately measure the area of ​​farmland with strange shapes, the operator must master basic geometric knowledge, know what to measure and what to remember. When encountering some strange plots of land, such as Linshui, Linshan, and other places where they cannot be measured directly, they will use geometric methods to convert them into other measurement values.

Another aspect of geometry is to use the direction of glass optics. Primary optics are very simple, which means that light propagates in a straight line. When the reflective surface encounters a complete elastic collision, it will be discussed with refraction, diffraction, etc. At this time, optics often use mathematics, research on the shape of the reflective surface. This is what Xu Ping said today, using a new mathematical system to change the previous Pythagorean technique to analytical geometry to study optical reflective mirrors.

The real mathematical content is not difficult for Jia Xian. The difficulty lies in combining it with the new mathematical system. Even the students of Si Tianjian who were studying with him were similar.

This is the importance of system education. Xu Ping started to deal with this system since he was a child when he was a child. Whether it was numbers or mathematical symbols, he formed an instinct since he was a child and could not feel the difficulties of this system at all. For these people a thousand years ago, mathematics was their expertise, but it was not easy to accept this system.

After sitting for a while, taking a sip of tea, Xu Ping looked at the sky outside and said to Jia Xian and the others: "Let's just go here today. This kind of thing is not urgent. I will go to the next day. I will go back to Beijing to take the field affairs in the evening. You and I will go to the newly opened business in Sansi with me and drink some wine to relax. There is no need to go home at night. I will rest in the glass yard, where there is a small courtyard that has been prepared. Tomorrow, I will experience the various mirrors with Qiu Dizhao tomorrow."

Jia Xian and several students around him promised.

As Chu Yan's most outstanding student, Jia Xian always felt that he was the top computing talent in the world. Until he met Xu Ping and saw so much knowledge that he had previously thought was amazing, Jia Xian suddenly knew that he still had a lot to learn.

Xu Ping made all kinds of knowledge one by one, and all kinds of knowledge were always organized and systematic. Now, it is amazing to have a new mathematical system, but it is not unacceptable. Moreover, for Jia Xian and others, Xu Ping was a high-ranking official in the court, and they dared not ask questions casually.

At this time, Xu Ping was another Yan Su in other eyes. He was just more complicated than Yan Su, and he had more credit and more official positions. Unfortunately, his talent in poetry, calligraphy and painting was not obvious, and ordinary literati and doctors could not feel it.

After taking a break, Xu Ping said to Jia Xian: "Okay, clean up and let's get up."

When he left the door, Xu Ping narrowed his eyes to the setting sun, stretched comfortably, retracted his hands, and straightened his body, but saw Zheng Jian and other groups of officials looking at him not far away.

Xu Ping looked around and saw that there was nothing strange around him. He asked Li Zhaoshu in front of him: "Zhongzu, why don't you go back? Why are you standing in the yard for something?"

Li Zhaoshu smiled embarrassedly: "To be honest, we have been studying for a few hours and are dizzy. We are discussing going out to have a drink in the evening, and are waiting for the deputy envoy to come out."

Xu Ping thought about it and realized that he must be waiting for him to treat him. Among these people, Li Zhaoshu and others were from aristocratic families. Ye Shen had been an official for many years, but his family was not rich. Although the most abundant Li family had been generals and ministers for generations, they did not buy much property in the previous generations. The whole family lived together, and compared with the Xu Ping family, they could only be considered poor.

With Xu Ping, a wealthy man who is worth a lot of money in the capital, and he is easy to talk to, he is naturally waiting to eat his wealthy family. To be continued.
Chapter completed!