Three Kingdoms

Who is Liu Hong?

The leading figure in the academic world who is tied for first place with Cai Yong actually said that he would accept him as his disciple. It was like a huge pie suddenly fell from the sky and fell in front of him. It was delicious...

Fei Qian just subconsciously opened his mouth and quickly closed it again. Well, why does this scene feel a bit familiar? Later generations seem to have encountered this kind of situation in the leadership office - it happened that the head of another department came to do something, and you just happened to do it smoothly. He praised you for your ability and said casually, do you want to work at my place...

If you agree, then everyone will have a laugh, and then you can only have a laugh...

Moreover, this was still in the Han Dynasty, a dynasty that paid great attention to the inheritance of teachers. The earlier the era, the more emphasis is placed on teacher-teacher training. Unlike modern times, everyone has experienced countless teachers from childhood to adulthood, including primary school teachers, middle school teachers, university teachers, Chinese teachers, mathematics teachers, etc., not counting those physical education teachers. Music or substitute teachers, so for modern people, there are too many teachers, so they don’t feel too big. On the contrary, in ancient times, a person might have one or two teachers in his life. , this difference naturally leads to different levels of emphasis on teachers.

"I almost fell into a trap," Fei Qian muttered, "Liu Hong looks very handsome, but I didn't expect that he would dig such a big trap for me..."

So Fei Qian held up his hands as a gift and said, "I thank you all for your love, but I already have a teacher."

Liu Hong actually didn't want to dig a hole for Fei Qian, but he was a little excited just now, so he said it casually, but he regretted it as soon as he blurted it out. He openly dug a hole in front of the victim, which was a bit embarrassing even if he and Cai Yong were old friends. Fortunately, Fei Qian didn't agree, otherwise it would be really difficult.

Seeing what Fei Qian said, Liu Hong just followed the trend and pretended to be stupid, "Oh, I wonder where he learned from him?"

At this time, Cai Yong coughed twice - Okay, you Liu Hongmo is acting. I just told you that Fei Qian was my registered disciple, or was it the one I called over?

You think Feiqian is good, I think so too, so don’t think about it. Before Fei Qian could answer, Cai Yong said, "Zi Yuan was recommended to me by an old friend, and we were destined to accept him as a disciple." - This time, Cai Yong intentionally said two less words, and was upgraded from a registered disciple to a registered disciple. Disciple.

It doesn’t matter if no one robs me. But if someone robs me, Cai Yong feels that Fei Qian is actually pretty good too. He’s not as handsome as me in terms of appearance, but he’s still pretty. His knowledge is naturally not as good as mine, but he’s got something to gain from his calculations. Coming out can actually impress this old guy Liu Hong - in this way, Liu Hong used to show off how powerful he was in calculus, but now my disciples all have something better than him, don't feel too good...

As long as they are human beings, they all have some small thoughts, and people in ancient times and today are the same.

Liu Hong suddenly slapped his forehead and said to Cai Yong: "Ah, I almost forgot, I have to say goodbye to you this time. I will leave Luoyang soon!"

"Why? I didn't just come back not long ago, what's going on?" Cai Yong felt very surprised.

Liu Hong said: "Hong Bucai moved to Shanyang County as the prefect. No, the seal and ribbon have been sent to him." After saying that, he took out the prefect's seal and ribbon from his arms and showed it to Cai Yong.

The prefect of the county was also a local official worth two thousand stones. Although Shanyang County was not a big county, it was not bad. Cai Yong felt relieved and asked: "So, when are you going to leave? I'll give it to you later." Practice it.”

"Okay, let's stay for a few days." Liu Hong agreed without being polite, and then took out a square wooden box from his arms that was slightly larger than a palm and gave it to Cai Yong, "Here. Come and take a look." The tone of his words was quite like some treasure that Cai Yong had been exposed to for a long time.

Cai Yong took it and took a look. The wooden box was made of ebony, with a layer of paint on the outside. It was quite exquisite. It shook slightly, and there seemed to be something inside.

At Liu Hong's signal, Cai Yong opened the box and took a look. He saw that the inside of the box was divided into three layers horizontally. The upper layer was the smallest, and the middle and lower layers were larger. From top to bottom, each layer was painted with black, white and red colors. Different colors are used to distinguish them, and there are nine vertical columns in the box, which together with the horizontal layers form ninety small grids. Between each small grid of the black and red layers, there are some circles of corresponding colors. There are nine wooden beads, black beads in total, and thirty-six red beads in total, but the white shelf in the middle of the box is empty.

"What is this?" Cai Yong frowned. Although he didn't know what this box was used for, it still felt familiar for some reason, but he couldn't grasp that familiarity for a while...

Liu Hong stroked his beard proudly and watched with enjoyment as Cai Yong was thinking hard - how could you possibly guess the wonderful thing that I have spent so much time and effort to figure out in just a short while?

Fei Qian looked at it, feeling that he had seen this form somewhere, and also guessing what Liu Hong was used for - but what is certain is that this thing must be related to mathematics, and a figure like Liu Hong must not He would be so bored that he would randomly find any toy as a treasure offering.

While thinking, Cai Yong casually picked up a black bead from the top layer of grids and placed it in the middle of the white paint area. In the grid...

Fei concentrated on thinking and suddenly thought, black beads and red beads, layered up and down, placed in the middle... What does this pattern look like? Fei Qian suddenly had an idea and blurted out: "Abacus!"

Liu Hong, who was stroking his beard happily and happily, was startled when he heard this. He couldn't help but use more force, and even pulled off two strands of his beard. He turned to Fei Qian and asked: "How did you know?!"

"Abacus?" Cai Yong murmured, and immediately realized that this was not a long abacus changed into beads, and then placed in a box like a disk, "Haha, that's it, it's just an abacus. I've guessed it a long time ago..." - Of course, I still tried to save my face, but in my heart I really admired Liu Hong's whimsical ideas.

Most people in the Han Dynasty still used abacus to count and calculate. The so-called "chi" for strategizing in ancient times refers to abacus.

The counter is actually a small wooden stick. According to personal habits, it can be divided into two counting modes. One is horizontal counter counting, and the other is vertical counter counting. It sounds very complicated, but in fact it is the stick that represents the number "one". It just depends on whether the chips are placed horizontally or vertically.

But after all, calculations have inherent flaws, such as being inconvenient to carry, easy to lose, accidentally getting mixed up in the middle of calculations, and sometimes stopping to do something in the middle of calculations and forgetting about themselves when they come back. Whether the calculation is based on horizontal chips or vertical chips, the result is that I have to start from scratch again...

Liu Hong himself is a master of arithmetic, and he is very sensitive to these problems. Therefore, he thought over and over again and invented this tool, which simplifies the arithmetic chips into arithmetic beads. The red beads represent one, the black beads represent five, and the white beads represent five. The area is used for calculation. Each column represents a single digit. The total of nine columns can be calculated to the level of hundreds of millions, which can meet the counting needs to the greatest extent.

Today I took out the finished product to show off to Cai Yong for the first time. Unexpectedly, Cai Yong failed to recognize it. Instead, Fei Qian next to him revealed the secret. How could Liu Hong not be surprised by this?