Future library

There are no fewer servants in the other courtyard than in the ancestral house, but the masters don't come often and are a little less cautious. Although they don't rush between the first and second doors, they leave their posts without permission. Commonplace.

Cheng Jinzhou still walked in from the small door and left Shi Yan outside to wait for the food sent by the Huo family. Sanfang has two small courtyards of his own in another courtyard, and the servant is also from Sanfang. In addition to rushing to the old house to report, he will arrange it properly.

The light in the rooms outside the main room was not very good. Cheng Jinzhou stretched tiredly and shook his head inwardly. His body was so weak that he felt tired even after riding in a car, so he fell asleep in a daze.

When he woke up again, Shi Mo was already standing next to him. He first ordered the maid to prepare things for washing, and then whispered: "Third brother, the young lady sent someone over to ask, what are you doing with all that food?"

"Who told you?" The matter of buying food must not be hidden. Cheng Jinzhou had already 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 cannot 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 the book boys of Cheng Jinzhou, and the second-class monthly salary is also from here. They will definitely turn to the young master first, but they do not dare to offend other servants easily.

Cheng Jinzhou snorted and said, "The driver?"

Shi Mo shook his head lightly.

"The shopkeeper of the Huo family?"

Shi Mo still shook his head.

Cheng Jinzhou was a little angry. He was not a good-tempered person to begin with. Even though he had been polishing himself 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 was not waiting for Cheng Yangzi, and when he heard the sound of being hit on the edge of the bed, he knelt down and said quickly: "It was the affairs report of the other hospital that informed the young mistress."

A boy of fourteen or fifteen years old knelt in front of Cheng Jinzhou. He only praised the evil old society in his heart, and then said carelessly: "Which sect?"

Cheng Jinzhou didn't understand that the door administrator was the supervisor of the disciples.

The two book boys couldn't explain. Shi Yan knelt down and said, "It's Gao Shiliu from the concierge. He saw us coming to the other courtyard and reported us first."

Cheng Jinzhou said "yes" and said: "Get up, you must inform me about such things in the future."

"Yes." Shi Mo and Shi Mo were not familiar with the original sick man, Cheng Jinzhou. After being kneaded twice by the sinister Cheng Jinzhou, he became submissive.

Cheng Jinzhou didn't talk about this topic anymore. He lightly snapped his fingers and asked, "Has all the food been delivered?"

"Everything has been delivered, 40 shi of rice, 40 shi of grain, and 10 shi of sorghum. In the end, there is only one, two or three yuan of silver left." Shi Mo said politely.

At this time, the maid also brought a neat copper basin, a towel made of long velvet yarn, a thin silk square towel, and a hand-sized soap. She also said: "Third brother, the second housekeeper said, in the warehouse in the backyard I’ll make an empty room for you here, where you can pile the food.”

A smile appeared on Dr. Cheng's face and he said: "Yes, thank the housekeeper for me. Send the things over now. You should get up too."

The latter 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 stopped using it.

"Everyone, please get out." Cheng Jinzhou pulled a silk scarf to wipe his face. After the three of them left, he pressed his finger on the ring again, thinking desperately: Customer service 010, customer service 010...

"Have you collected enough money?" The customer service man's tone was stiff.

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 felt relieved again, and while walking out, he whispered: "That's enough, we'll be there in one minute."

"Press the button when you arrive, and the ring will be received automatically. You can also set the quantity. Currently, your Star Alliance points are 1 and your level is 1. You will not be able to have an independent trading platform until level 3." After customer service 010 finished speaking, he only left Next to the big virtual button is a white space for entering numbers, just like a later search engine.

Feeling unhappy at being ignored, Cheng Jinzhou had no choice but to enter the setting of 7.2 yuan, and then slowly walked to the warehouse in the backyard.

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

After waving everyone away, Cheng Jinzhou pressed Xuxu's big button.

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

Cheng Jinzhou sighed with emotion. After traveling through time, he thought he was insulated from it.

After choosing the wheat easily and skillfully, I saw the pile of wheat diminishing little by little. After about two or three minutes, the voice of customer service 010 came again: "The transaction is successful, you can choose to read."

Cheng Jinzhou couldn't wait to look at his chest height, and saw a paper-like octavo book appearing in front of him, surrounded by dense smoke. If others could see the content displayed on the ring, they would even think it was a book. Deputy speech posture.

"Elements of Geometry..." There are publishers and translators behind it. Cheng Jinzhou read it word by word, and his face gradually darkened.

He studied theoretical physics for 8 years. Although his grades were disastrous, even if he plagiarized a paper, he still needed to look up the information. According to the age, although the Elements of Geometry were quite suitable for the medieval level of the Great Xia Dynasty, the content inside was completely 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, "Elements of Geometry" translated by Xu Guangqi also exerts an influence all the time. It was through the translation of "Elements of Geometry" that Chinese defined the most basic terms of geometry today: point, line, straight line, parallel line, angle...

The clever and clear translation of these basic terms shines brightly in its own right.

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 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 ancient Greece for thousands of years, but they have no value at all to Dr. Cheng, a time-traveling man in the 21st century. Even in the Great Xia Dynasty, similar understandings were not new.

"It's a pity for my money." Cheng Jinzhou shook his head gently and opened 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 curled his lips.

"Do you want to delete this book?" Mr. Customer Service answered 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 basis of astronomy is naturally mathematics and physics. The Great Xia Dynasty lagged far behind other countries in the study of star arrays. It was not a problem to sell such a very basic book for a few taels of silver in royalties.

Customer Service 010 said nonchalantly: "Due to 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."

"certainly."

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.

…