future library.

Chapter 16 Level [-] Star Warlock

The power of the Star Warlock mainly comes from three aspects.Talent, star formation, plus various computing abilities acquired through training.

Both the square and the square root are the simplest calculations. Naturally, it is not difficult for astrologists who rely on this to make a living. But to use oral calculations to calculate the square root of 1369 (the square value of 37), there are not many shortcuts except the familiarity and sensitivity to numbers .

In the eyes of young astrologers, a person who memorizes the square of 37 (Note 1) will obviously remember more simple calculation results, and these are the basis for increasing computing power.

Even in the 21st century, those talented mental arithmetic boys can only show amazing calculation ability by memorizing many commonly used formulas and numerical calculation results by memorizing.

With the level of the 16th century, as a teenager of twelve or thirteen years old, Cheng Jinzhou's performance obviously exceeded some gentlemen's expectations.

How did they know that Cheng Jinzhou judged the third digit entirely based on the Pythagorean number—if he hadn't been reading "Elements of Geometry" recently, his sensitivity to these numbers would be far inferior to that of a mathematics student preparing for the exam.

No matter what, Liu Kuang has a good impression of Cheng Jinzhou. The young man who looks thin and weak also has the "style" of an astro-warlock, and he is also "working hard". His voice became softer and said: "Xie Soon, that small bag of adjustments is indeed a gift that should be given to you."

It proved that Cheng Jinzhou was not lucky, and the gift was naturally given out.

Mother Cheng's face suddenly glowed.

I heard Liu Kuang continue: "Then I'll ask you again."

As he spoke, Liu Kuang flicked casually, and instantly drew a standard parabola on the paper a few meters away, and asked, "Have you seen this graph?"

Cheng Jinzhou was still admiring the marvelous skills of the star warlock, and suddenly fell into a dilemma.In the era of popularization of mathematics, if anyone draws a big inverted U shape, people's first reaction is a parabola, not the letter U that was hit by a Mitsubishi modified car. It's difficult.

After a while, Cheng Jinzhou said hesitantly: "Yes."

"It seems that you have read a lot of books yourself. Children of aristocratic families are different after all." Liu Kuang's words were calm, but the appreciation in his tone could be heard by everyone.

The Cheng family did have a good library, but there wasn't much about mathematics and physics.

"We call it a parabola. On both sides of it, draw coordinate axes, which are (0, 0)..." Liu Kuang went on to talk about the coordinate system. In front of everyone, the speed was very fast, but the content was very Simple.

For this world, the concept of the coordinate system is already one of the cutting-edge.Knowing how to use the coordinate system means that analytic geometry has begun to develop. In many cases, analytic geometry can solve many problems that cannot be solved by ordinary geometry. Of course, the most important thing about it is that it can be integrated with algebra to quantitatively solve geometric problems—— In practical applications, determining the numerical value is often more important than qualitative.

Maybe it's the needs of the astrologists. In this regard, their development is far more than Cheng Jinzhou estimated.It seems that a very low-level apprentice star warlock has a considerable knowledge of coordinates.

Liu Kuang talked for three or four minutes, and then asked Cheng Jinzhou: "In this case, can you find out what is the focal point of the parabola and the line passing through the coordinates of the vertex?"

It is a very elementary question, but it still needs to involve some equations. In the world Cheng Jinzhou lives in, it is a two-dimensional equation, and the answer has only been obtained after hundreds of years of development.

Several astrologist disciples also stared at Cheng Jinzhou. People who have just started to contact the coordinate system must be confused when faced with similar problems, just like Cheng Jinzhou's parents in his previous life, even though they received the basic education of Cheng Jinzhou , but can't understand the problem about coordinates at all.

Cheng Jinzhou had a condescending feeling of being discriminated against. He put on a show, weakly clicked on the paper, and calculated casually: "25, 25."

After reading it, I realized that the old man's swipe was quite precise.

Everyone in the Cheng family looked at each other in surprise. The sick child Cheng in their impression seemed to be too different from the child in front of them.Of course, people will not think of unrealistic time travel.

Liu Kuang continued to ask questions noncommittally, and soon involved simple functions, but it was obvious that these were a bit too childish for Cheng Jinzhou.

Elementary mathematics, for doctoral students in the 21st century, must be thoroughly studied.Since entering university, Cheng Jinzhou has rarely been so confident.

The inquiry soon turned into a discussion. At the beginning, Cheng Jinzhou was really a little too excited. In addition, he didn't know much about the development of mathematics in the Great Xia Dynasty, so he said a few amazing words. Too much beyond the normal range—or, by the standards of an astro-manager, the range of a normal person is broad enough.

Time passed quickly, and there was a meal in the middle. When night fell, the Cheng family invited Liu Kuang to dinner again, but the latter still refused.

Moreover, in Cheng Jinzhou's expectant eyes, Liu Kuang did not ask for apprenticeship or other more valuable requests.Although he was extremely satisfied with Cheng Jinzhou himself, he also said a lot of words of praise.

While puzzled, Cheng Jinzhou had to admit that trying to repeat the successful path of crossing the crowd was still a failure.

Even Cheng's mother couldn't hide her disappointment and kept saying, "It doesn't matter, you are still young."

In fact, for children who want to become astrologers, 12 years old is not too young.There are always many factors to consider when recruiting an apprentice for a formal star warlock, and luck is one of them. After all, they don't recruit apprentices all year round.

A group of people waited, those with different moods had dinner in the main house, and went back to their rooms.

The red and yellow lanterns illuminated the Qingshi road mistyly, and Cheng's father walked with his hands behind his back, walking on the left side of Cheng Jinzhou.Compared with the usual style, it is much more intimate.

He was more delighted than surprised by Cheng Jinzhou's performance throughout the afternoon. After a moment of silence, he said: "I don't know that you like mathematics and science, but this is a way. If you like it, I can ask some colleagues to take you to Xiang city ​​or the capital.”

Xiangcheng is a top-notch city in the entire south.

Cheng Jinzhou was interested, but he quickly shook his head and said, "My parents are traveling not far away. If I want to go, I'll see."

His mathematics has little to do with this era, even if it is the best school, it is meaningless.

Maybe it was because the first sentence was used well, Cheng's father didn't care about Cheng Jinzhou's lazy voice, he nodded slightly and said: "From now on, come to my room to test your homework once every three days, remember."

Cheng Jinzhou suddenly had a bitter face, as if he had been beaten by someone, and he strongly objected: "You are usually busy with business..."

"That's it." Cheng's father showed the demeanor of the head of the family.

Cheng Jinzhou was helpless, seeing that his mother didn't seem to be able to object, he retreated and said: "I want to do some experiments, and I need to get some food."

"Mathematics and science can be regarded as the right path, and others should not be mixed in." Cheng's father said, then changed the subject and said: "Don't waste it, let's talk to your mother about the details."

Like the scholars and literati in ancient China, Father Cheng only had a carefree life and had a weak concept of money itself.

Speaking of things in the inner house, Mother Cheng pondered for a moment and said: "From now on, in the middle of every month, ask Zhuangzi outside the city to send 50 shi of food over. If you want anything, just tell the housekeeper in advance."

"Okay." Cheng Jinzhou couldn't tell whether he should be disappointed or satisfied after getting such an answer after a busy day.

Note 1: 37 is a prime number, the square value and cubic value of prime numbers are usually remembered.

(End of this chapter)