This math book, Xue Lang is going to write a series. The first volume is very simple, it is written with reference to the first book of elementary school mathematics, and it is mainly to popularize basic knowledge. Therefore, in the eyes of adults who already have a foundation in mathematics, this book is very simple, and it is naturally quick to read.

King Qin quickly flipped through it, holding the "preface" written by Xue Lang in his hand, and thought silently. Princess Pingyang took the rest of the manuscript paper and flipped through it, and after that, the sage and the king of Qi read it. King Qi said: "Sister...... What is the purpose of my brother-in-law's book? Seems overly simplistic? ”

King Qi called Xue Lang awkwardly, and looked at Princess Pingyang after calling, Princess Pingyang smiled indifferently, didn't say anything, and didn't say anything unusual, Xue Lang found that King Qi seemed to be quietly relieved...... Ahem, poor child!

In his heart, he lit wax for King Qi, and Xue Lang said with a smile on his face: "Because this book is used for enlightenment, naturally it can't be too difficult." ”

"I see."

King Qi didn't ask anymore. After reading the manuscript of the preface in his hand, King Qin handed it to the sage and asked, "What is written in the Book of Youyang, mathematics is the foundation of all disciplines, I don't know how to understand it?" ”

Xue Lang said: "If you want to explain this sentence, you have to start with the division of disciplines. In the flower planter, the discipline can be divided into two major subjects, liberal arts and science. Under these two major subjects, smaller subjects are subdivided......"

Xue Lang started from the division of disciplines, and first explained clearly what subjects there are, and what role mathematics can play in promoting them. After speaking, Xue Lang said: "...... It can be said that a person's whole life, starting from the ground and ending in old age, is dealing with mathematics. The date of birth, weight, etc., are calculated mathematically, and when you reach old age, you are also mathematically calculated. Mathematics is closely related to a person's life. ”

Everyone nodded in agreement. Xue Lang said: "This is the aspect of life. In other affairs, from the state to pay taxes, build bridges and pave roads, down to the salaries and salaries of officials and sergeants, they all need to be calculated mathematically. The astronomical calendar, geography, and knowledge of things can all be calculated by mathematics. That's why mathematics is the foundation of all disciplines. ”

After a pause, Xue Lang continued: "Actually, if we talk about arithmetic research, the Ten Classics of Arithmetic have been done very well, and the depth and breadth of the research are sufficient, so to speak, it is much ahead of other places in the world at the same time. In our country, there is a special examination for the selection of arithmetic subjects, and there will only be more and no fewer people who study arithmetic. Although the Ten Classics of Arithmetic emphasize examples over theory, compared with the wisdom of my ancestors, the arithmetic knowledge I have learned is not superior, and what I rely on is that the calculation method is more simple. That's why I wanted to write such a math book for enlightenment to make up for the lack of existing arithmetic books. ”

Xue Lang explained his thoughts clearly, and the sage and the King of Qin nodded in unison. King Qin asked: "This year, the calculations and statistics of the Ministry of Gold have been completed faster than expected, is it because Youyang uses the method of digital calculation?" ”

"Yes. I asked someone to make two large wooden boards, and used the charcoal strips left over from burning to make a pen, and calculated on the wooden board, which is easier and faster than calculating chips, so the calculation efficiency can be improved. ”

The sage asked strangely, "This year, the official affairs of the Ministry of Civil Affairs have been completed as in previous years, has it been ahead of schedule?" ”

King Qin said: "Back to my father, when the summer harvest was in previous years, the Ministry of Civil Affairs always had to work hard all night for a few days, but this year there is not, and I think there must be the credit of Youyang." ”

This is all the less surprising as the completion date is the usual one in previous years. The requirements of the people above will only get higher and higher, moving their mouths at the top and breaking their legs at the bottom. Pei Ju is old and sophisticated, and he is also old, so he is naturally not the kind of person who is eager to perform and make credit for his subordinates, and he has room to do things. After a little thought, the saint understood that this is the normal condition of human beings, and he waved his hand and skipped it.

Speaking of mathematics, the sage said: "I once heard Pingyang say that the reason why you are so knowledgeable is related to the school system of the flower planter, right?" ”

Xue Lang said: "The erudite words spoken by the sage are ashamed and dare not be ashamed. However, when it comes to the school system of the flower planter, there is merit. The school system of the flower grower starts at the age of three, goes to kindergarten, starts elementary school at the age of six, and attends six years of elementary school, three years of junior high school, three years of high school, and then four years of university. Before university, everyone took the same course, but after college, they began to divide their subjects into more professional and in-depth studies. ”

The sage counted and said, "Isn't that going to school all the way to the age of the weak crown?" ”

Xue Lang said: "Back to the saint, yes. Therefore, the minister never went to university, and most of what he learned was from books or specially asked teachers to teach, and his learning was relatively mixed, and he did not have the profundity of a professional university. However, although this school system is good, it is not applicable to Datang. ”

King Qin said: "What Youyang said is very true, I was established at the beginning of the dynasty, the tax is limited, and the world is not yet peaceful, and military salary is the first major expense. Therefore, although this policy is good, there is no capital to implement it. ”

Xue Lang nodded and said, "As Erlang said, education can only be led by the state. However, one is limited by money, and the other is limited by teachers. Both are indispensable for the development of education. ”

Of the four ancient civilizations in the world, only China has been handed down, which is inseparable from the Chinese nation's tradition of attaching importance to education and inheritance. Because of such customs, civilization has been passed down and continued from generation to generation. In later generations, when China was poor and white, there was a policy that contributed to the development of education, that is, the free policy for normal students, which trained many teachers needed for compulsory education.

In fact, the teachers trained in this way are not enough, and in many remote areas, many people who graduated from high school and junior high school and cannot be admitted to university have become substitute teachers.

Everyone knows the importance of education, but the conditions are limited. The situation in the Tang Dynasty at this time did not allow such a policy to be implemented at all.

None of the people here are straw bales, even the King of Qi can figure out the pros and cons. The sage sighed and said: "Governing a big country is like cooking a small fresh, there are a thousand things, although I have ambitions, but the conditions are limited, not all good policies for the benefit of the country and the people can be implemented, it is really a big regret in life!" It is even more difficult to start a business and keep a business, and now that the country has been established, how to do it in the future depends on future generations. ”

"Son, Leader!"

In addition to Xue Lang, King Qin, King Qi, and Princess Pingyang all knelt down. Xue Lang looked left and right, and knelt down, which made the saint laugh, and the depression that had just risen dissipated in an instant, and asked with a smile: "Youyang, why are you kneeling?" ”

Xue Lang scratched his head silently in his heart, and said, "The minister will also work hard to assist the saint wholeheartedly." ”

The sage laughed, got up, pulled him up, and praised, "It's good that you have this heart." ”

Next, everyone discussed Xue Lang's math book together, and they all thought that it could be finalized. Seeing this, Princess Pingyang sent someone to take the manuscript back to Chang'an, and let the printing workshop under her name start printing.