Jia Xian looked at the various triangles on the blackboard, rubbed his forehead, and said in a deep voice: "If you say these things, it is not difficult, I have studied the Pythagorean technique for many years, and there are few things that I have not considered before. Pen & Fun & Pavilion www.biquge.info but now with this new number, addition, subtraction, multiplication and division are the same novelty symbols, and I feel dizzy after looking at it for a few hours. Deputy envoy, it is better to do this today, and wait until I am familiar with this new set of numbers and symbols, and then I will reason. ”

Xu Ping had no choice but to agree: "This thing can't be done urgently, we must calm down and do it in a down-to-earth manner." In a few days, I may have to go outside the capital, and if I don't have time, I will tell you first, you just have to swallow the dates and write them down first, and when you have time, you can think about it slowly. The content is really not that difficult, the difficulty is only in these symbols, and it is good to be familiar. ”

In the past, China's arithmetic system has always relied on arithmetic, and most of the various arithmetic scriptures are also explained based on arithmetic, and people who are not familiar with it look at it like people who don't know how to play chess and are confused.

Xu Ping had used to fiddle with calculations in Yongzhou, and after getting familiar with it, he felt that it was far less convenient than the mathematical symbols in his previous life. This is a reasonable thing, the mathematics he learned in his previous life, that system I don't know how much mathematics everyone has sorted out, whether it is convenient, easy to learn or scientific, it is much more advanced than the elementary tool of arithmetic.

Now to cultivate mathematical talents, this set of mathematical system is first to be promoted, and this alone does not know how many talents will be created, which will allow them to take a big step forward in the mathematical system.

Generally speaking, Jia Xian's knowledge of mathematics is no less than that of Xu Ping's junior high school in his previous life, and his specific direction is far beyond that of high school, and the research of some problems has reached the level above the university level. After mastering the new mathematical system, they will step beyond the level of junior high school mathematics, basically grasp what they learned in high school in their previous lives, and make greater progress in the direction of geometry, number theory, and calculus. These directions have the accumulation of mathematicians in previous lives, and they have studied many concepts thoroughly.

Jia Xian and his senior brother Zhu Ji also focus on different directions, Jia Xian mainly studies trigonometry and number theory, and does not involve irrational numbers and differentiation at all, which is his own deliberate choice. Zhu Ji studied under Liu Hui, and he exerted more force in the direction of differentiation, but was weaker in geometry and number theory.

According to the characteristics of the two, Xu Ping made a division of labor.

Zhu Ji switched to data statistics and analysis, which is the most useful practical mathematics for the three divisions. Although Xu Ping himself remembered some formulas and conclusions from his previous life, he was not systematic, and even some practical content was forgotten in his previous life.

Jia Xian was arranged by Xu Ping to do elementary algebra in geometry and systems, which was another aspect of knowledge that officials of the Third Division needed to master. At this time, the imperial court basically collected agricultural taxes according to the number of acres of land, and the measurement of the number of acres of fields required geometric knowledge.

Xu Ping couldn't imagine the difficulty of measuring farmland in his previous life, in fact, there were very few talents who could measure land in this era, and Guo Jian was a rare talent among officials who only used Fangtian's method.

To be able to accurately measure the area of farmland with various shapes, the operator must master the basic geometric knowledge, know what to measure, and what to remember. When encountering some peculiar plots, such as waterfront, mountain, and other places that cannot be directly measured, they will be converted into other measurements by geometric methods.

Another aspect of geometry is the orientation of glass optics. The primary optics is very simple, that is, the default light rays propagate in a straight line, and completely elastic collisions occur when they hit the reflective surface, and then the more advanced ones talk about refraction, diffraction, and so on. At this time, optics often used mathematics to study the shape of the reflective surface. This is what Xu Ping is talking about today, using a new mathematical system to change the previous Pythagorean technique to analytic geometry to study optical reflection mirrors.

It is not difficult for Jia Xian to really have these mathematical contents, but the difficulty lies in combining them with the new mathematical system. Even the several Si Tianjian students who were studying with him were similar.

This is the importance of systematic education, Xu Ping began to deal with this system since he was a child in his previous life, whether it is numbers or mathematical symbols, he has formed an instinct since he was a child, and he does not feel the difficulties of this system at all. For these people a thousand years ago, mathematics was their specialty, but it was not easy to accept the system.

After sitting for a while and taking a sip of tea, Xu Ping looked at the sky outside and said to Jia Xian: "Let's get here today, this kind of thing can't be rushed." Tomorrow will be off, and Wang Gongchen, who will lift the camp and field affairs in the evening, will return to Beijing, and you and I will go to the newly opened field affairs of the Third Division and drink some wine to relax. You don't have to go home at night, rest in the glass field, where there is a small courtyard prepared, and tomorrow follow Qiu Zhizhao to experience all kinds of mirrors. ”

Jia Xian and several students around him promised.

As Chu Yan's most outstanding student, Jia Xian has always felt that he is the world's top arithmetic talent. It wasn't until he met Xu Ping and saw so much knowledge that he thought was amazing before, and Jia Xian suddenly knew that he still had a lot to learn.

Xu Ping made things one by one, and all kinds of knowledge have always been organized and systematic, and now he has a new arithmetic system, although it is surprising, but it is not unacceptable. And for Jia Xian and these people, Xu Ping is a high-ranking official in the imperial court, and they don't dare to ask this and that casually.

At this time, Xu Ping is another Yan Su in other eyes, but he is more miscellaneous than Yan Su, has more credit, and deserves more officials. It's a pity that his talent in poetry, calligraphy and painting is not obvious, and ordinary literati doctors can't feel it.

After resting for a while, Xu Ping said to Jia Xian: "Okay, clean up, let's get up." ”

Out of the door, Xu Ping squinted at the west-slanting sun and stretched comfortably, withdrew his hand, and straightened up, but saw Zheng Jian and a group of officials not far away looking at him.

Xu Ping looked left and right, and saw that there was nothing unusual around, so he asked Li Zhaoshu in front of the person: "Zhongzu, why don't you go back, what are you doing standing in the courtyard?" ”

Li Zhaoshu smiled embarrassedly: "Don't hide it from the deputy envoy, we have studied for a few hours, dizzy, here we are discussing going out for a drink at night, and we are waiting for the deputy envoy to come out." ”

Xu Ping thought about it and understood that he must be waiting for his treat. Among these people, Li Zhaoshu and several others are from big families, and Ye Shen has also been an official for many years, but his family wealth is not very rich. Although the most affluent Li family has been in the past few generations, they have not bought much property in the previous generations, and the whole family lives together, which can only be regarded as poor compared to Xu Ping's family.

There is Xu Ping, a rich and wealthy man who can count in the capital, and he is easy to talk to, so he is naturally waiting to eat him. (To be continued.) )