Liu Ru is sprinkled with joy and writes a thousand words. Anyway, it's a silent writing, and it's not difficult for Liu Ru. But if you write too many words, your arms will be tired, and you have to explain to Chen Yuan after writing, so it is not appropriate to write too much at once.

It happens that the "Xun Meng Sentence" is divided into two parts, each with fifteen verses and nine crosses in each stanza. Liu Ru wrote five verses, which is the content of today's lecture.

In the usual school, there is one lecture every day, and it is done in exactly 30 days a month. But Chen Yuan memorized a lot of opera lyrics, and he was very good at memorization, so Liu Ru added it to five sections. This is also the difference between tutoring and school, which is more targeted.

Wait for Liu Ru to finish explaining, let Chen Yuan recite it again, and check that it is correct, and the lesson taught by Liu Ru today will be completed.

Next, it was naturally Chen Yuan who gave Liu Rushi a lesson in turn.

The total amount of things that Hua Xue has taught Chen Yuan is not much, but it is also divided into categories and quite complicated.

Chen Yuan said to Liu: "Sister Liu, let me tell you what Xue'er taught me, you can see what you want to learn." ”

Liu Ru originally thought that Hua Xue would let Chen Yuan only teach himself the astronomy he had proposed earlier. I didn't expect that there would be a choice, and I affirmed Hua Xue's talent and open-mindedness.

"Sister Liu proposed to study astronomy before, but Xue'er said that predicting the disaster to this extent requires too much knowledge and too much knowledge involved. can only start from the basics, and you may not be able to learn it after a year or two, Sister Liu must be mentally prepared. ”

Liu Ru nodded: "Of course." If it's easy to be superficial, how can it be that only the playboy can do it? ”

Hua Xue was praised, and Chen Yuan was also happy: "Xue'er said that to learn disaster prediction, the two most basic subjects are called mathematics and physics, and then there are astronomy and geography. ”

"Astronomy and geography, I understand, can this mathematics refer to arithmetic? Physics refers to the principle of things? ”

That's right, that's exactly how Cher explained. Cher said that mathematics is the foundation of all learning, even if you speak and write, how many words you say, how many strokes you write, this is all counted. ”

"It's a novelty, but it's true."

"Physics is the knowledge of things. Xue'er said that most of the previous personalities took the wrong path, but the Mo family had a very good set in the way of things, but it was a pity that the Mo family was divided, and the descendants put the cart before the horse. ”

"Putting the cart before the horse? The Mohist concept, and love, non-attack, Shangxian, Shangtong, Tianzhi, Ming ghost, non-life, non-music, festival funeral, and economy, which is the foundation and what is the end? ”

Cher said these are the ends. He said that he had never seen 18 of the 15 volumes and 71 articles in the Mozi book. Of the parts he had read, only the six articles of the tenth and eleventh volumes of the "Book of Ink" were fundamental. If the descendants of the Mo family had studied the "Book of Ink" with their hearts, instead of dwelling on civil strife, the Mo family would have had the opportunity to be on an equal footing with Confucianism and Law. ”

Liu Ru was very surprised, and the statement of Hua Xue relayed by Chen Yuan was very different from what she had always known: "With Confucianism and Confucianism? What's going on with Legalism? Isn't it to depose the hundred schools of thought and respect Confucianism? ”

This Xue'er also said, he said that the descendants of Confucianism claim to follow the way of Confucius and Mencius, but they all practice the way of Xunzi. The way of Confucius and Mencius was almost burned when Qin Shi Huang burned books and pit Confucianism. What Li Si left behind were all Confucian scholars of the Xunzi lineage. And the way of Xunzi, external Confucianism and internal law, in fact, is Confucianism and law in parallel. When the hundred schools were deposed, in fact, only ninety-eight schools were deposed, except for Confucianism, the Legalists were only deposed on the surface, but in fact they were more reused. Because deposing itself is a Legalist method, not a Confucian method. ”

"I see."

Although Liu Ru did not take the imperial examination, he had also read the scriptures, but he had not been poisoned by them all the year round, so he could listen to words that were different from today's mainstream Confucianism. She also didn't know that Hua Xue always claimed to be the successor of Xinxue, so she wouldn't be surprised by Chen Yuan's remarks about Hua Xue.

"Astronomy is as small as clouds, rain, wind and frost, and as big as the starry sky, all of which are based on physics, otherwise we can only know what it is, but we don't know why. Cher initially taught me about star charts, but after teaching me for two days, she decided to wait until I was at a certain level in physics before starting to learn it. ”

"Hmm."

As for geography, Cher said that he is proficient in the theory of mountains, rivers, hydrology and surface. As for the inner geology, that is, Zhang Heng's geodeticism, Xue'er said that he has not yet started researching it. But if all you're concerned about is the weather, you usually don't need geology. ”

"Hmm."

"In addition, Xue'er said Sister Liu, you may be particularly interested in the art of war, but although these Xue'er have taught me, he said that with my level, it is not enough to teach you, so I can only say that I can discuss what I have learned with you. In the end, Xue'er also said that she hopes you will also learn martial arts from me, after all, there will be chaos in a catastrophe, and it is much safer to have martial arts. ”

When Liu Ru heard the last two eyes shine, she almost said: "Don't teach me astronomy, teach me the art of war!" ”

However, thinking that since Chen Yuan was also a beginner, she was indeed not necessarily better than herself in this aspect, and she was willing to discuss it with herself, so she didn't say so, and what she said was: "That's really good!" The dude thought it all over. In the future, there will really be a sister Lao! ”

Chen Yuan's heart was really guessed by Hua Xue, Liu Ru is actually ambitious, and his favorite is the art of war.

The next step was the formal teaching, Chen Yuan took out her math class notes and asked Liu Rusi: "Sister, do you have a math class?" ”

"Well, there is. "Fang Tian" and "Corn" are okay, but "Decay" is a little dazed......"

Chen Yuan hurriedly interrupted: "Sister, slow down!" My sister is talking about "Nine Chapters of Arithmetic", right? That's not what Cher taught me. ”

She actually wanted to ask if she could multiply songs, abacus or something like that. However, Liu Ru has even read "Nine Chapters of Arithmetic", and these two things are inevitable.

Liu Ru choked: "What is that?" ”

"Does my sister know the Tianzhu number?"

"What's that?"

"It's a counting method, about the same as counting chips. What Cher taught me was his improved counting method, which is more convenient than an abacus. ”

Liu Ru learned Arabic numerals and arithmetic methods, especially vertical methods, and tried to do a few multiplication and division, only then did he believe that this method was really exquisite, and he was even more impressed by Hua Xue's talent.

Because Liu Ru has a certain foundation in mathematics, Chen Yuan is easy to teach, and she learns quickly.

The concept of positive and negative numbers and the solution of a system of equations are exactly the content of the chapter "Equations" in the "Nine Chapters of Arithmetic", which is represented by numbers and symbols, which is much more intuitive than expressing them in words.

Liu Ru is because he is self-taught "Nine Chapters", and he is completely confused about these, and after Chen Yuan said it, he suddenly felt that his mouth was suddenly opened, and he was confused, and everything was clear.

When Chen Yuan finished speaking, Liu Ru was a little aftertasted, and was even more surprised: There is still more than enough to finish the entire chapter of "Equation" in this hour, wouldn't it be possible to finish "Nine Chapters of Arithmetic" in nine days? "Nine Chapters" is not a textbook for Mengxue, how profound is Hua Xue's arithmetic?