The white rice paper is painted with criss-crossing lines, outlining a three-dimensional figure, which seems to be a cuboid, but it is not complete. One third of the shape seems to have been cut with a knife, revealing the twists and turns inside.
What is this?
Then he saw the mark on the paper.
Kang surface, flue, dog hole...
It’s actually a drawing of a fire bed? But I’ve never seen such a complicated fire bed...
Li Chunfeng was fascinated by what he saw. He found that this kind of picture was a form of expression that he had never seen before. With just a few strokes, the internal and external structure of the entire kang was clearly displayed in front of his eyes. This was just a kang. If it were like this
Wouldn't it be clearer if the drawing method was applied to the construction of large palaces, with all the construction steps and effects displayed?
The more Li Chunfeng thought about this picture, the more interesting it became, and then he saw the tadpole-like text next to the picture.
Looking carefully, I have never seen it before.
Li Chunfeng prided himself on being a scholar and a well-informed person, but this novel font was definitely unprecedented, and he would not think that Fang Jun was just playing around with drawing symbols on drawings...
"What is this word?"
Li Chunfeng pointed at the tadpole article and asked.
Fang Jun took a look and said casually: "Arab..." Suddenly he realized and shut up.
What he wrote was actually a calculation method for roughly how much material was needed to make a kang, but these were Arabic numerals. Did the Tang Dynasty have them?
Definitely not!
If Li Chunfeng asked "How did you know this?", how would he answer?
As expected, Li Chunfeng asked in confusion: "Arabia? The country of great food seems to have another name, but what does this have to do with the country of great food? The writing of the great food country is not like this."
Fang Jun really wanted to give himself a slap in the face. What he was most afraid of was "revealing his secrets" in front of Li Chunfeng, but he accidentally dug a hole for himself. He really did whatever he was afraid of...
Looking at Li Chunfeng's eyes full of curiosity, Fang Jun knew that he couldn't say anything. The more he didn't say anything, the more suspicious he would be. If he doubted his origin...
He quickly said: "I learned this from a big cannibal. He said they are called Arabic numerals. They were actually invented by the people of Tianzhu to facilitate calculations."
Li Chunfeng didn't doubt that he was there. In fact, he didn't care where the word came from. He was just more interested in the calculations. Although he couldn't understand them, he thought they were very powerful...
"Can you tell me something about this poor Taoist?"
Li Chunfeng asked, pointing to the calculation formulas "", "-", "×" and "÷".
Fang Jun had no choice but to bite the bullet and explain a simple algorithm for addition, subtraction, multiplication and division of ten Arabic numerals.
Li Chunfeng listened attentively for a long time, shook his head and said: "It's a novel thing, but that's it. It's not much better than our algorithm... Eh! That's not right!"
Suddenly he exclaimed. After thinking about it carefully, he was pleasantly surprised and said: "This number is easy to write. I didn't think much of it at first, but the more complex numbers are involved, the easier it is to calculate! What a genius idea..."
He immediately took Fang Jun's "pencil" and started writing and drawing on the paper.
He wrote the addition of two large values, listed the calculation formula and quickly calculated the result, and then listed the multiplication of the two values, covering it with the multiplication formula. He was pleasantly surprised: "Without calculation, it can still be so convenient.
The result is very good!”
Are you still using abacus? Should I show you the abacus again and shock you... Fang Jun thought to himself.
Of course I'm just thinking about it, but I don't dare to do anything more...
Li Chunfeng marveled and said: "I have never heard of such a simple number before. I am ashamed and ashamed... From now on, I will save a lot of trouble."
Fang Jun was convinced.
Li Chunfeng was the Taishi Ling, in charge of the revision of the calendar. In other words, he was an astronomer. Astronomy requires dealing with a large amount of data calculations, so astronomers in ancient and modern times, at home and abroad, must themselves be mathematicians of considerable standards.
No wonder Li Chunfeng found this "Arabic numeral" as if he had found a treasure.
After studying for a while, Li Chunfeng happily walked away with Fang Jun's drawing, and even postponed Fang Jun's hypocritical invitation to stay for dinner.
After Li Chunfeng left, Fang Jun suddenly remembered something.
This Niubi came here today, it must be because of the poem last night. I think he recited it casually at the time, but he didn't really hear it, so he came to ask for the full poem. At this moment, he forgot about it because of the Arabic numerals.
When I think about it when I get home, won't I come to my door again?
Fang Jun had a headache when he saw Li Chunfeng, a half-immortal. He hurried back to his study, swiped ink and copied the entire song "Qing Ping Le" in one go, and ordered his servants to catch up with Li Chunfeng and deliver it to him.
This bullshit won't happen again in the future, right?
Fang Jun sighed, sat on the bench, picked up the tea cup and took a sip, but suddenly jumped up!
Finished!
I was in a hurry just now and just wanted to get rid of the bullshit quickly, so I just used my usual "Zhao Ti" to copy the poem...
That guy won't be interested in "Zhao Tizi" anymore and come back to "ask for advice", right?
Fang Jun sweated on his forehead and immediately shouted: "That Niubi comes back again and says that he is going to retreat and no one will see him!"
I immediately packed up and ran to the blacksmith shop in the back mountain...