Chapter 82 Constants

The villagers and children in the village have returned, and the people of Zhuangzi have withdrawn to the Zhuangzi farther away last night, and now they know that they are fine, so they come back again.

When Su Xiaomei saw Su You, she pounced: "Brother, are you okay?" ”

A group of younger children also talked around the older children, while looking curiously at the people of the second forest department.

Seeing so many children, Ah Mi glanced at Su You again, and also had a trace of admiration for the warmth of Da Song.

In the mountains and forests of the three hundred miles around the Second Forest Department, the law of the jungle does not allow such a scene to exist.

Su You smiled at everyone: "It's just right to come back, it's all a misunderstanding before, these native soldiers and uncles have built a house for us, just wait for you to come back to build wooden beds, furniture, and prepare to move into a spacious house!" ”

The children cheered and chattered to express their gratitude to the soldiers of the Second Forest Division.

The soldiers couldn't understand Chinese, but the children's sincere smiling faces made them smile.

In the next two days, Shijiazhuang provided vegetables and meat, and the children were responsible for the food of the soldiers, and the soldiers learned to use circular saws to change planks, wooden squares, and build furniture, and the progress was fast.

Mr. Fan was impressed by Su Xiaomei's ability to comprehend, and the old and the young communicated together all day and night, Su You didn't know what Su Xiaomei had learned, but Mr. Fan and several account offices were very attentive to Sanskrit numbers and double-entry accounting.

Su You is not hidden, this thing is just a means for him to promote the management of commercial circulation, but he hopes that through economic means, the Erlin Department and Meishan Jiangqing will gradually be tied together, and become a powerful foreign aid of Meishan Commercial Group.

Industrial transfer, carrying foreign self-respect, in the strength is too weak, Xichuan from the scholar doctor did not enter a large number of people, is the last resort to survive, Su oil is not pedantic in this.

The meal should be eaten in one bite, and things should be taken step by step, and what the master said was to ask questions and think closely, and benevolence was in it, which is what it meant.

As for whether the Erlin Department will be revolted when it becomes stronger, Su You has not had this worry, in history, the southwest Yi until Wuxi Man, in the Song and Ming dynasties, was basically completely beaten, assimilated, and finally completed the land reform in the Qing Dynasty, integrated into the national family, and then there was no difference with the Han people.

The barbarians of the south are still different from the north, well, except for the corner of the continent that is far, far away......

Thinking about it far, it is still a big construction project, there are local soldiers who take turns to operate wheel saws, and there are small timbers exchanged for Shijiazhuang. Wooden squares, planks, and running water are generally sent down from the processing table.

Su You also made a planer, which is similar to nailing the planer sideways to the table, but the cutting edge is much longer, and the soldiers push the wooden squares or stacked planks together, and soon they can get smooth wooden pieces.

The power of batch processing of standard parts has finally been reflected, and those that can be nailed by punching and bamboo nails should be nailed with bamboo nails as much as possible. In just two days, the wooden beds, desks and chairs, cabinets, blackboards, and clothes boxes and shelves were gradually enriched.

It is true that the fineness is not fine enough, but with the appearance of the minimalist style of the later generations of self-assembled wooden furniture, there is another beauty.

Ah Homi was amazed by the efficiency, and asked that when he returned, he would take all the things such as planers and nail stools with him.

She is also interested in the children's courses, but she is more interested in the liberal arts stories, as for the addition and subtraction of mathematics and area calculation, it is really a headache to see.

Today's math lesson is about measuring pi.

The tool is a pinion made of hardwood scraping, thirty-six teeth are separated by a ruler, and then the length of three hundred and sixty teeth is rolled out in a straight line with ink, and the stick is cut off and mounted on the gear as the radius of the great circle.

Then scrape mud on the flat ground and use the gears to roll out a large circle with a radius of three hundred and sixty teeth.

Then divide the number of teeth on the large circle by the number of teeth in the diameter to get pi.

After that, the experiment was left to the children and they were given the freedom to adjust the radius and calculate the relationship between the number of teeth on the large circle and the number of teeth on the diameter.

Then everyone found out that this number was actually an almost constant value.

Su You finally concluded: "This number is called constant, and there are many such constants hidden in the laws of heaven and earth, as long as they are discovered, it will be of great help to our production." ”

"For example, now, Little Brother Qi can calculate the amount of mud needed for a round mud cake. Next, we will explain how to use this constant, and the radius of the circle, to find the area of the circle......"

“…… Okay, that's the way, but this constant is not accurate enough for us to take 3.14 at the moment. ”

"How do you derive the exact rate of pi? The two great mathematicians of ancient times, Zu Chongzhi and Liu Weizhi, have left us accurate derivation methods, but this requires you to continue to study mathematics in depth before you can master it. ”

“…… Tomorrow we will start to explain some of the amazing properties of the ruler and how to solve some of the theorems, and that's all for today......"

The children dispersed, and Mr. Fan came over and said: "Mingrun, I can analyze the questions in the "Nine Chapters" clearly and clearly, starting from the preliminary addition and subtraction, from the easy to the difficult to gather sand into a tower, and perfunctory into "Arithmetic Preliminary", "Geometric Preliminary", "Nine Chapters of Derivation", it is really breathtaking. ”

The first two are textbooks, and the latter one is actually a collection of exercises, Su You didn't dare to reveal his true thoughts, and learned from Mr. Fan and said: "Children are weak, so they can only be supplemented by arithmetic, and some machinery has been developed to save strength, to put it bluntly, this is just a book of basic craftsmen, and it should not be praised by Mr. Fan." ”

Mr. Fan said: "Mingrun is too modest, not to mention anything else, only this weekly rate, which is convenient for astronomical calculars." Manda Song, no, the whole world can tell Zhou Xiang, the old man dares to say that two slaps can be counted, but Mingrun this method has a lot of loopholes......"

Su You said with a smile: "Indeed, compared to Liu Gong's technique of cutting the circle, this method is just inferior, but it is just easy to understand and discover." To let everyone master the concept of the art of cutting the circle, and then deduce pi, the progress is fast, it will take two or three years of learning, and the slow progress will take five or six years. ”

Mr. Fan took Su You's hand and said with a smile: "Come on, come on, the old man asked himself that he is still proficient in one or two chapters, but the technique of cutting the circle is indeed too profound, you tell me first, and the decimal you created is also worth studying......

Confucianism is still at the end of the exegesis of exegesis, Taoism has just begun to emerge, followed by a few decades of controversy, and finally Cheng Zhu Lixue as the representative of the rule of the millennium.

Therefore, the current people of the Great Song Dynasty are tolerant and eager for all kinds of knowledge. Confucianism, Yi, Taoism, Interpretation, and even astrology, divination, medicine, military, geography, astronomy, and all kinds of ......

Among the scholars, there are many talents in mathematics, many masters, and even advanced their research to a very deep level.

Su You came to this world and thought that mathematical research was not his responsibility, and that the level was above him, Qin Tianjian, Jiang Zuo, and Ji Si, and the talent was the vehicle bucket.

His task is to disseminate, to make mathematics fall from the altar and become something that ordinary people can use to guide production and transform it into productive forces, rather than a metaphysical and ethereal pure academic research, or only applied to astronomical calculations.

He wanted to use a simple and easy-to-remember scientific annotation system to show the profound speculative proofs in the minds of the mathematicians of the Great Song Dynasty on paper one by one, so that more people could come into contact with them, understand them, become interested, study them deeply, and inspire more geniuses, rather than just in the hands of a few people by word of mouth.

At this point, in fact, Su You thinks that what he has done is of the same nature as what his master did in the Spring and Autumn Period.

Moreover, Su You thinks that he is much less difficult than the master's statement that it is difficult to sell when he traveled around the world.

To put it bluntly, the world is bustling, all for profit, and your own set of things can achieve immediate results.

Moreover, Su You has a deeper purpose, to change some things, this era is the last opportunity, once missed, it will be difficult to have another chance.