This is like in the math exam in later generations, you only write the final result for a big question, but there is no calculation process, which makes it difficult for the teacher to mark the paper. I don't know how you calculated, whether it was copied, or whether it was clouded.

In the absence of a numerical symbolic system, it is obviously very difficult and cumbersome to express the computation process in full text.

Another point is that the ancient Chinese way of writing is vertical, which is very inconvenient to express numbers and calculate. You can imagine how awkward that is.

And Li Chunfeng is not a person who eats the old and sticks to the old ways, and his ability to make considerable achievements in mathematics, astronomy, calendar, etc., is inseparable from his diligent study and apprenticeship.

Convenient, intuitive, concise, and clear at a glance, and easy to summarize the algorithm, revealing the quantitative relationship is conducive to reasoning, this is the evaluation of the digital symbol system given by Li Chunfeng.

Of course, Xu Qilin raised his hands in favor of this, and said to Li Chunfeng with a smile: "Dr. Li's proposal is fully supported. I also want to have a competition with Guozijian's arithmetic hall to prove that this number symbol is convenient and easy to learn! ”

Li Chunfeng thought for a while and said, "With the same time and similar intelligence, I thought it would be much faster to learn "Elementary Mathematics". ”

Fast is certain, quick is also absolute, Xu Qilin is very confident in this.

"In this way, the students of the Dayingku Arithmetic Hall are undoubtedly victorious!" Xu Qilin smiled proudly, as if he saw the black faces of the defeated Guozijian people.

Li Chunfeng smiled, feeling that Xu Qilin was still a teenager, what if he defeated the Guozi Accounting Academy, his background could not be changed, and he was still a noble child.

Of course, it is an indisputable fact that the number symbols have been valued because of this, and the students of the Dayingku Arithmetic Museum have one more way out.

"This "Elementary Mathematics" is just the first volume, when will the next volume be printed?" Li Chunfeng doesn't care who wins or loses, but wants to get a full picture of the number symbols, "I am looking forward to it, and it is also very beneficial to the improvement of mathematics." ”

"It should be soon, right?" Xu Qilin scratched his head and said, "I have already handed over the craftsman to cast the word mold, and I have been busy recently, and I forgot to ask." ”

The casting of digital symbols is also a big project, the cost is not small, and the typesetting must also be done by Xu Qilin himself, and no one understands this calculation formula yet!

Li Chunfeng pondered for a moment and said, "If Xu Cheng is busy with official business, he can also help him." ”

Xu Qilin thought for a while and said, "Then please ask Dr. Li to come to Dayingku tomorrow to help with typesetting and printing!" ”

As he spoke, he confessed and went to the study to get a draft for Li Chunfeng, "Dr. Li will review it first to see if there are any mistakes." ”

Li Chunfeng hurriedly stretched out his hand to take it and flipped through a few pages, although the handwriting was sloppy and the strokes were not like those written with a brush, but he was looking at the content. This second volume is printed, and the entire digital symbol system can be regarded as basically perfect, which can be called epoch-making significance.

"Whimsical and concise." Li Chunfeng nodded his head in appreciation and said: "Only this reform will make Xu Cheng enough to leave a name in history." ”

Of course, without these number symbols, how can we discuss more complex abstract problems, how can we do calculus? Go, I hate calculus the most!

Xu Qilin pretended to be humble for a few words, and sent Li Chunfeng, who was eager to go back to read the research draft, away.

When I returned to my yard, I saw Scarlett and Adjani doing their own business. One is eating melon seeds while drawing, and the other is lying on the table and making an abacus.

That's right, it's the abacus, an ancient calculator, which is very simple to manufacture and convenient to use.

"Aaron is back." Scarlett heard the footsteps, threw down the work at hand, got up to greet her, and helped Xu Qilin wash her face and change clothes.

When her own Ah Lang is the most important, Scarlett is a good girl.

Adjani was almost, she pretended to get up to greet her, called Ah Lang, and saw that there was no shortage of herself to serve, so she sat down again, staring at the birds eating on the stone table, as if she was sketching.

Xu Qilin glanced at the lazy girl and shook her head, but in a blink of an eye, she was comfortably served by Scarlett.

Smiled and touched the girl's face, Xu Qilin leaned into the sofa, and his shoulders and neck were pinched comfortably. Xu Qilin snorted twice and asked lazily, "Who is giving gifts again?" If you don't know where you came from, don't you. ”

Scarlett chuckled twice and said, "Don't you dare to do this, it's a royal reward for Alang." ”

Xu Qilin was stunned for a moment and said, "You don't have to give it to me in person, you want me to thank me or something?" ”

Scarlett shook her head and said, "I sent it to the house during the day, probably because I saw that Ah Lang was not there, so I put it down and left." ”

Xu Qilin smiled: "This is convenient." Well, I didn't open it to see, Your Majesty's reward, it should be a good thing, right? ”

Scarlett stopped her hand, pulled Xu Qilin and said with a smile: "It's better for Ah Lang to open it himself, the royal thing is very noble, and the slave family is not good to touch casually." ”

"How can there be so much." Xu Qilin was helpless, and was pulled close by Scarlett and reached out to open the box.

Scarlett stared at the two bowls in the box and exclaimed, "What a beautiful bowl! ”

Xu Qilin picked up one and examined it carefully, flicked it with his fingers, felt that it was made of glass, and then looked at the shape and appearance, knowing that this was an imported goods transported in through the Silk Road.

Even if it is an imported product, the quality is too bad according to later generations, the texture is impure, turbid and blurred, and you can still see the bubbles in it.

Strictly speaking, in ancient China, there was only glass and its production technology, but there was no glass. The chemical composition of glass and glass is not the same and should not be confused.

At this time, even Western glassmaking technology is crude and imperfect. It would probably take more than 600 years for Italy to make a breakthrough in glass manufacturing.

Although this is a way to make a fortune and make a lot of money, Xu Qilin has thought of it a long time ago, but he has never put it into action. Patent law was one of the conditions he expected and hoped for, but the other reason was that he didn't want to be too high-profile and attention-grabbing.

The monopoly of Xianglu is enough to make people blush. Add to that the glass, and the glass mirrors, and the windfall is crazy enough.

Xu Qilin is well aware of this, and has been weighing whether to continue to monopolize exclusively, or operate cooperatively, or hand it over to the royal family in exchange for official ranks and rewards.

"I'll give it to you to eat." Xu Qilin finished appreciating it and gave it to Scarlett casually.

"It's too precious." Scarlett wanted to return it to Xu Qilin, but when she saw him smiling and didn't stretch out her hand, she was afraid of falling, so she had to hold it carefully, as if it was a priceless treasure.

Adjani also came over at some point, and asked with a smiling face, "Ah Lang, is there a slave family?" ”

Xu Qilin waved his hand like a nouveau riche, "One for each of you, and you will eat this bowl of rice in the future." ”

Oh, Adjani smiled and bared her teeth, and like Scarlett, she touched it with great care before taking it out to take a closer look.

After a few years, this is the usual play, what cups, bottles, jars, all use glass. Well, the glass bottle with perfume, that's what it looks like!

Xu Qilin looked at the two little girls who were like treasures, and couldn't help but smile, turned around and went back to lie on the sofa.

There was not much time, Scarlett put the bowl back in the box, and came over to serve Xu Qilin, but he pulled him into the sofa and hugged him.

Scarlett giggled, and when she saw Adjani staring at the glass bowl in a daze, she pecked Xu Qilin's face quickly and lightly, and her face immediately flushed.

I can't eat this loss, you kiss me, I have to kiss back.

Xu Qilin kissed the girl's face, leaned back, and smiled contentedly.

Scarlett took Ah Lang's arm, stabilized her mind, and said, "Ah Lang, the slave family wants to learn to ride a horse, you talk to the horseman." ”

"Horseback riding?" Xu Qilin was stunned for a moment, shook his head and said, "You are still young, you can't ride that big horse." By the way, how do you want to learn this? ”

Scarlett lowered her eyelids and said softly: "The slave family knows that Ah Lang is going to go far away, is it Luoyang?" If you can ride a horse, the slave family will be able to serve with Ah Lang. ”

Xu Qilin patted Scarlett's hand and said, "Then you don't need to ride a horse, it's the same for a car." ”

"It's not comfortable to ride in the car, and it's not convenient." Scarlett's blue eyes looked at Xu Qilin, and begged: "Just talk to your subordinates, it's not troublesome." ”

Xu Qilin nodded helplessly and said, "I'll buy you a pony to practice first, and then change to a big horse when you are proficient." ”

Scarlett nodded vigorously and affectionately pulled Xu Qilin's arm tighter.

……………

Superstition and science are correct, this statement sounds very strange, but for Xu Qilin, he has become accustomed to it.

After experiencing the underworld, there is a soul detention order in the body, and it is difficult to be a materialist if you want to admit it!

At the beginning, Xu Qilin also wondered if there were ghosts wandering around, but he couldn't see it.

Of course, this sight is a bit eerie and terrifying. The solution he can think of is not to think about it, and repeatedly subconsciously encourage himself that in the human world, ghosts are not scary, they are not hindered, they are not affected.

And until now, it has been. There are no supernatural events, no evil spirits entangled, and there is no love between people and ghosts in the fast.

But as he became more and more proficient in the use of the Soul Detention Order, a strange feeling that he couldn't explain appeared from time to time.

Sometimes, he felt as if he was being spied on, looking around and finding nothing; Sometimes I wake up suddenly in my sleep, as if a mysterious sixth sense is warning me.

Trouble is inevitable, but Xu Qilin didn't take it too seriously, and it didn't affect his work and life, he still felt that he might be too sensitive.

Because Xu Qilin had to recognize the underworld and ghosts, but he also had his own considerations and judgments. The so-called human beings are humane, and ghosts have ghost paths. The existence of two different forms should not disturb each other and be safe and sound.

As for what evil ghosts and evil ghosts harm people, Xu Qilin thinks that people have done something wrong, and the hallucinations born from restlessness and cranky thoughts all day long are just scaring themselves.

But things are often unexpected and imaginary, Xu Qilin doesn't want to deal with ghosts, and he doesn't expect any irresistibly beautiful female ghosts to seduce, but something related happened that made him unable to escape.

Of course, Xu Qilin didn't take it too seriously at first. After receiving the report from Xu Bao, the manager of the Zhuangshang Workshop, he just asked him to go to the Taoist temple or temple to ask someone to go to Chaodu Sticker, thinking that everything would be fine without his move.

But Xu Bao soon sent someone to report again, and the monks and Taoist priests were invited, but after only two days, strange things happened repeatedly, which made the workers a little panicked.

Even Mrs. Zheng wrote a letter and euphemistically invited Xu Qilin to go to the village, and even she, Ah Ke and Xiao Zhao seemed to be affected.

Xu Qilin can't sit still now, it is related to his relatives, he doesn't dare to be the slightest slack. Guan Li Chunfeng asked for a few charms, and then led the people to ride to the village.

On the surface, Zhuangzi is still like that, and it is normal to meet Zhuang Hu, and it does not give Xu Qilin any special feeling.

Anxious to find her sister-in-law, Xu Qilin saw Xiao Zhao in the small building by the lake, and when she saw that she was very healthy and healthy, most of her heart was relieved.

Zheng Tuantuan didn't say anything, and after the cold noise, he went to the bench and swing by the lake to sit idly. Xu Qilin felt that she wanted to talk to herself alone, sat in the building for a while, and went to find Mrs. Zheng while Xiao Zhao was not paying attention.

"Mrs. Zheng, what is the strange thing mentioned in the letter?" Xu Qilin met Zheng Tuantuan by the lake, and asked, "I don't know very clearly, so I am very worried." ”

Zheng Tuantuan finished the ceremony, so he frowned slightly and said: "Maybe the slave family is suspicious, or maybe there is really something unclean, when the slave family says it, Ah Lang will decide ......."

There must be ghosts in this world, but Zheng Tuantuan doesn't have yin and yang eyes, how can he detect it? Xu Qilin listened to Zheng Tuantuan with doubts, and finally understood the reason.

The so-called unclean things are not what Zheng Tuantuan feels, but Ah Ke. Although she is blind, her other senses, such as smell, hearing, and even her sixth sense, are far beyond the average person.

It was also with these keen senses that she sometimes sensed that something was approaching, but when she reminded her, Zheng Tuantuan found nothing.

Once or twice, Zheng Tuantuan will think that it is Ah Ke's delusion. But she also found that Xiao Zhao occasionally appeared strange, as if she was talking to someone, and as if she was talking to herself.

When there were rumors on the side of the workshop, Zheng Tuantuan thought of these things and felt that it was necessary to inform Xu Qilin. Regardless of whether there is something or not, you must always figure it out before you can rest assured.

After Xu Qilin heard it, he didn't think it was serious. But when it came to his sister-in-law, he didn't dare to take it lightly, so he thanked Zheng Tuantuan and went straight to Xiao Zhao to ask him face to face.

According to psychology, 60 percent of children between the ages of three and 5 make up their friends, also known as virtual partners. This virtual companion can only be seen by the children themselves, and will be described relatively realistically, such as "he is a little shorter than me, he plays games with me, he likes to eat cookies", etc.

(End of chapter)