future library.

Chapter 5 Geometry Elements (Part [-])
The servants in the other courtyard are no less than those in the ancestral house, but the masters don't come here often, and they are less cautious. Although they don't run around between the first gate and the second gate, they leave their posts without authorization. Commonplace.

Cheng Jinzhou still walked in through the small door, and left Shi Yan outside to wait for the food from Huo's family.Sanfang has two small yards of its own in another courtyard, and the servants are also from Sanfang, apart from rushing to the old house to report, they will make proper arrangements for him.

The lighting in the rooms other than the main room was not very good. Cheng Jinzhou stretched tiredly and shook his head inwardly. This body was so weak that he felt tired even in the car, so he fell asleep in a daze.

When he woke up again, Shi Mo was already standing beside him, first he ordered the servant girl to prepare something for washing, and then whispered: "Third Brother, Young Madam sent someone over to ask, what are you doing with the food?"

"Who said it?" The matter of buying food must not be hidden. Cheng Jinzhou had expected that at his age and status of 12 years old, no matter what he did, his servants would report it to his parents.However, they should not be allowed to report casually. .

Shi Mo's eyes wandered for a moment and he said, "Shi Yan and I know the rules and don't dare to talk nonsense outside."

They are Cheng Jinzhou's schoolboys, and the second-class monthly cases also come from here, and they will definitely go to the little master first, but they dare not easily offend other servants.

Cheng Jinzhou snorted and said, "Master driving the carriage?"

Shi Mo shook his head lightly.

"The treasurer of the Huo family?"

Shi Mo still shook his head.

Cheng Jinzhou got a little angry, he was not a good-tempered person, even though he had been honed in school for so long, he was still a standard second-generation ancestor. At this moment, he slapped the edge of the bed and said angrily, "Say!"

Shi Mo didn't wait on the sick man, but when he heard the sound of "slap" being hit on the edge of the bed, he fell to his knees and hurriedly said, "It was reported to the young lady by the gatekeeper of the other hospital."

The same fourteen or fifteen-year-old boy knelt in front of Cheng Jinzhou. This guy only praised the evil old society in his heart, and then said carelessly: "Which school?"

The gatekeeper is the supervisor of the disciples, this is something that Cheng Jinzhou doesn't understand.

The two schoolboys couldn't explain, Shi Yan knelt down and said, "It's Gao Shiliu of the concierge, he saw us coming to the other courtyard, so he reported us first."

Cheng Jinzhou gave an "en" and said, "Get up, you must tell me about such things in the future."

"Yes." Shi Mo and Shi Mo were not familiar with the original sick child Cheng, and after being kneaded by the black-bellied Cheng Jinzhou twice, they became docile.

Cheng Jinzhou didn't continue talking about this topic, snapped his fingers lightly, and asked again: "Is all the food delivered?"

"It's all delivered, 40 shi for rice, 40 shi for grain, and 10 shi for sorghum. In the end, there is only one or two or three sen of silver left." Si Mo said politely.

At this time, the maid also brought a neat copper basin, towels woven with long-pile threads, thin and small silk squares, and soap the size of a palm, and said, "Third brother, the second housekeeper said, in the warehouse in the backyard There will be an empty room for you in which you can pile up the food."

A smile appeared on Dr. Cheng's face, and he said, "That's right, thank the housekeeper for me, and send the things over now. You can get up too."

The last sentence was directed at Shi Mo Shi Yan.

After washing his hands and face casually, Cheng Jinzhou did not use soap that smelled good. The soaps of this era were very complicated, including more than a dozen raw materials including Angelica dahurica, white monkshood, pig tooth sapodilla, camphor, almond, soybean powder, etc. These The effect of the thing is just that, what Cheng Jinzhou can't stand the most is that most soaps contain finely ground lead powder, and the quality of soap is largely reflected in the amount of lead powder.So since the girl said it once, he didn't use it anymore.

"Let's all go out." Cheng Jinzhou wiped his face with a silk scarf, and when the three left, he pressed his finger on the ring again, thinking desperately: Customer service 010, customer service 010...

"Have you collected enough money?" Mr. Customer Service's tone was blunt.

Cheng Jinzhou looked up at Shi Mo and asked first, "Did you hear that?"

"What?" Shi Mo blinked.

"What can you see?" Cheng Jinzhou asked again.

Shi Mo shook his head carefully and said, "I didn't see anything special..."

Cheng Jinzhou was relieved again, and while walking out, he whispered: "Enough, it will be there in one minute."

"Just press the button when you arrive, and the ring will automatically receive it. You can also set the quantity. Currently, your star alliance point is 1, and your level is 1. Only when you reach level 010 can you have your own trading platform." After customer service [-] finished speaking, he only left There is a big virtual button next to it, and there is a white space for entering numbers next to it, just like the search engine of later generations.

Being ignored was very uncomfortable, and Cheng Jinzhou had no choice but to enter the setting of 7.2 yuan first, and then slowly strolled to the warehouse in the backyard.

The grain of 90 shi, about 4.5 cubic meters, was piled into a small warehouse, and the surrounding area was cleaned.

After waving his hand to let everyone leave, Cheng Jinzhou pressed the Xuxu button just now.

The familiar confirmation and cancellation pops up, followed by a large selection box, which includes not only rice, wheat and sorghum, but also wood, bricks, silk and other things. It turns out that everything within 10 meters of the surrounding area is included. Go in.

Cheng Jinzhou sighed with emotion. After crossing, he thought he was insulated from it.

I chose the wheat easily and skillfully, and saw the pile of wheat shrinking a little bit. After about two to three minutes, the voice of customer service 3 came again: "The transaction is successful, you can choose to read."

Cheng Jinzhou couldn't wait to look at his chest-high position, and saw a paper-like Octamo book appearing in front of him, surrounded by dense smoke. The posture of the deputy speech.

"Original Geometry..." is followed by publishers and translators.Cheng Jinzhou read it word by word, and his face gradually darkened.

He has studied theoretical physics for 8 years. Although his grades are terrible, even if he plagiarizes a thesis, he still needs to consult the information. According to the age, although the original geometry is quite suitable for the middle ancient level of the Great Xia Dynasty, the content inside is completely different. Not what he needs right now.

From a historical point of view, "Elements of Geometry" has infinite significance. It is not an exaggeration to say that it is the pioneering work of classical mathematics. It is the Elements of Geometry that established the rigorous method that is most commonly used and hated by middle school students today. Logical argumentation method - because "the proposition has been proved", "the matter to be proved is correct", and the well-known method of proof by contradiction. Before Euclid, even a gentleman with an IQ of 200 had never thought of it.

For the Chinese, Xu Guangqi's translation of "The Elements of Geometry" is also exerting influence all the time.It is through the translation of "The Elements of Geometry" that Chinese has determined the most basic terms of today's geometry: point, line, straight line, parallel line, angle...

The translation of these basic terms is clever and clear, and it radiates brilliance in itself.

This is a math bible!

However, Cheng Jinzhou does not need dazzling brilliance. He wants to make glass, mirrors, or even fire pots.Except for the proof process, the content of Elements of Geometry is all junior high school content. It does not have any guidance in terms of applications that are most needed by the public - one can and can only draw a straight line through two points; line segments (finite) A straight line) can be extended infinitely;. With any point as the center and any length as the radius, a circle can be drawn; all right angles are equal;. A straight line in the same plane intersects two other straight lines. If the two straight lines on the same side of the straight line intersect, If the sum of the interior angles is less than 180°, then the two straight lines must intersect on this side after being infinitely extended.

These five points were shocking in the thousands of years of ancient Greece, but they are of no value to Dr. Cheng, a time-traveling man in the 21st century. Even in the Great Xia Dynasty, similar understandings are not new.

"It's a pity for my money." Cheng Jinzhou shook his head lightly, and casually flipped open the geometry original in front of him.

In the whole book, the most practical value is the theorem proof based on the five postulates. If the bad student Cheng Jinzhou is asked to do it, he may not be able to complete it. If you want to say that this book is not worth a few taels of silver, it is self-evident. Cheng Jinzhou, who claims to be acquainted with the academic community, is not easy to say this.

"010, let's have another book." Cheng Jinzhou pouted.

"Do you want to delete this book?" Mr. Customer Service replied quickly.

Cheng Jinzhou raised his head in surprise and said, "Of course not."

The study of star arrays is mainly the study of astronomy, and the foundation of astronomy is naturally mathematics and physics.The Great Xia Dynasty lags far behind other countries in the study of star arrays. It is not a problem to sell such a very basic book for a few taels of silver.

Customer service 010 said indifferently: "Because of your Star Alliance level, your terminal can only hold one book at a time."

"No wonder that Playboy book was collected so quickly." Cheng Jinzhou muttered.

Jiezi said without any emotion: "Are you sure you want to buy another book?"

Cheng Jinzhou shook his head first, and then said: "At least I can copy it down."

"of course."

Cheng Jinzhou walked out of the warehouse with a sad look on his face. Others couldn't see what the ring showed, which was no longer an advantage.

……

(End of this chapter)