As for Luo Yong's idea, he actually wanted to lay a foundation first.
After all, mathematics is a subject that played a very important role in the development of many modern sciences.
Starting to lay the foundation now will definitely benefit in the future.
Of course, it is not just Arabic mathematics that is called mathematics.
Traditional Chinese mathematics is also mathematics, and what Luo Yong is currently teaching can only be regarded as some basic arithmetic.
This is only the most basic and simplest part of the entire mathematical knowledge system.
The so-called Arabic mathematics is mathematics studied in Arabic.
The researchers here are not only Arabs, but also people from many other countries and regions.
Later studies showed that these Arabic numerals originally originated in India.
Around the eighth and ninth centuries, the Arabs built a "Palace of Wisdom" and gathered scholars from all over the world to translate and collect many classics in the world at that time. .
From the initial introduction period mainly through translation, to the widespread use of Arabic, it continued to develop, and finally became an internationally accepted numerical symbol.
This is the general development process of Arabic mathematics.
At this time in the early Tang Dynasty, the "big food" people in the Tang Dynasty referred to Arabs.
It is now 635 AD.
Five years ago, that is, 630 AD, this year was the "Year of the Delegation" of Christianity.
Muhammad led his followers to conquer Mecca, and other tribes on the Arabian Peninsula came to worship.
Converting to the leadership of Muhammad, the Arabian Peninsula was unified and continued to expand outwards to form the Arab Empire.
Luo Yong spent a lot of time to compile this information from the pile of books and miscellaneous materials in his space.
Luo Yong's mood is somewhat complicated, but no one can deny that Arabic mathematics developed under the influence of Arabic is an irreplaceable treasure in the history of human civilization.
It is now 635 AD.
It has just been a dozen years since the founding of the Tang Dynasty.
The Arab Empire is rising.
What is the situation like in other parts of the world at this time?
What about Europe?
Just before Tang Jian arrived, Luo Yong was still thinking about this question in his mind.
This day was another snowy day, with heavy snow falling on the ground.
From time to time, a cold wind blew through, blowing the snowflakes in the air and flying all over the sky.
Tang Jian sat on the tall horse and watched Luo Yong leading his disciples and striding towards this side.
The young man was thin, with a childish face, and his eyes were clear and firm.
When he stood not far in front and looked at the group of them, Tang Jian felt that his eyes seemed to be able to penetrate the thick snow curtain.
Travel through the mountains and ridges, through the unknown and chaos.
How could such a person be a thing in the pond?
Tang Jian guessed that the saint should be a little wary of Luo Sanlang.
This time he heard that the military defense in the Mengmen Pass area was to be strengthened.
Are we guarding against the barbarians outside the Pass, or Luo Sanlang within the Pass?
In the blink of an eye, the two sides were already close, but Tang Jian didn't show anything on his face.
He turned over and dismounted, smiled and greeted Luo Sanlang and others who were coming towards him.
After some greetings, he first said these The copper coins and silk cloth were sent to the Luo family's courtyard, and then the group went to the Xu family's guest house for dinner as usual.
His Majesty the Emperor was eager to get the recipe for Eucommia gum and soil cement, so Tang Jian naturally did not dare to neglect.
That night, he had a detailed discussion with Luo Yong in the Luo family hall.
Luo Yong was not surprised that the emperor wanted these two prescriptions.
Since he wanted them, he had no choice but to give them to him.
Is there anything he can't give?
He didn't do these things in order to get much benefit for himself.
It was just to get some copper coins and silk.
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"I heard that there is a war in the southwest, and it is a time when money and food are tight.
How can I let His Majesty spend so much money just for these two local people?"
Luo Yong declined.
"If Sanlang makes profits from these two methods, the income will be more than a mere five hundred guan.
Your Majesty is also grateful for Sanlang's high righteousness.
Although the treasury is tight, he is not willing to treat Sanlang too badly."
These words in the scene are naturally said in a pleasant way.
It is a fact that the national treasury is tight, but it is not enough to get into trouble just for the sake of Qian800uan.
Today's saint has always been meticulous.
Whether it is the management of the official team or the income and expenditure of money and food, he keeps a close eye on it.
The current Tang Dynasty only has such a population, and the taxes it collects every year are also limited.
It has to make a living for the people and develop the economy.
There are often wars on the border.
It will definitely not work if it is not spent carefully.
Even if it is As an emperor, you can't spend whatever you want.
Luo Yong naturally knew that the emperor was unwilling to pay him a high price, which was normal.
His current situation was like a child taking a rare toy to a pawn shop to pawn.
What high price could they offer him?
, it would be very kind not to just give things away directly.
If you meet someone with a dark heart, you may even lose your life.
Since Li Shimin is the emperor, he has been hit by swords and blood, and he has never seen anything.
Luo Yong is not related to him, and with current interests, how can he be expected to allow him to give him these things, so it is considered very good.
Yes.
After that, Tang Jian and others rested for two days in Xipo Village.
The journey in winter was really difficult, and they finally walked all the way from Chang'an City to here.
They rested for two days.
The saint would not blame them.
Tang Jian had not been idle these past two days.
He ran to Luo Yong's yard early every morning and pestered Luo Yong all day long to teach him the vertical calculation method.
This person has a good foundation and studies seriously.
Looking at his energy, it seems that he wants to take out all the knowledge in Luo Yong's belly and study it one by one.
In less than two days, vertical addition and subtraction could no longer satisfy his thirst for knowledge.
"This method is really easy to use.
Even people who are not very smart can do arithmetic as long as they learn this method."
After mastering vertical addition and subtraction in a short period of time, Tang Jian couldn't help but sigh.
In the past, when people did arithmetic, they mainly relied on brainpower.
If the brain was not smart enough and the calculation was not clear enough, most of them would not be able to calculate well.
Small numbers were fine, but when it came to large numbers, it was completely impossible.
With this kind of vertical calculation, Don’t be afraid of formula arithmetic, no matter how big the numbers are.
"It's a pity that we only have addition and subtraction.
It would be great if we could have multiplication and division."
After sighing, he felt a little regretful.
"I heard a few words from that Hu Shang."
Luo Yong said.
"Sure enough," Tang Jian said excitedly.
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Even though he knew this guy was throwing bait, he still had to bite the hook, and he did so willingly. "" Luo Sanlang smiled but said nothing.
"Tell me, what do you want me to do?"
Tang Jian is such a smart person.
There is nothing else he can't figure out.
I just want to negotiate terms with him.
"It's not a big deal."
Luo Yong said with a smile: "I heard that in those academies in Chang'an City, students from the four majors can supplement the Taixue.
How on earth is this supplementary method?"
"You want to send your brother to study in Chang'an City?"
Tang Jian probably also saw that Luo Sanlang is not interested in studying now, and he may not really want to go to Chang'an City.
If you ask him about this matter now, most likely it will be for his sake. younger brother.
"Wulang is still young now, let's wait and see in a few years."
Luo Yong said: "I have a classmate who is now studying in the Four Schools."
"You want me to help him study for college?"
Tang Jian carefully looked at the young man in front of him.
He is still a child after all.
Look, how innocent and cute these words are.
You can help a classmate of mine transfer to another school.
"After all, we are classmates."
Of course, Luo Yong would not tell anyone about his little thoughts.
Even if he was the person involved, he might not let the other party know one day.
The road of heterosexuality is so broad and easy to walk.
Why drag people to the single-plank bridge?
"" Tang Jian pondered, he could still get this place as an imperial scholar.
Naturally, this gesture was to prevent Luo Yong from thinking that this matter was easy. "" Luo Yong didn't say anything.
It's up to you to decide whether to agree or not.
Anyway, it's not something that should be done.
Luo Yong will definitely not teach the vertical calculation method of multiplication and division.
Of course, if they try to figure it out on their own, , it should be possible to figure it out, after all, the addition and subtraction methods are already there, it just takes a lot of effort.
That's what the emperor says.
Luo Yong has no room for bargaining.
Let's forget it.
We have to do what we should do.
Sure enough, after pondering for a while, Tang Jian finally relaxed: "I'm afraid it won't work this year.
I'll help him take a look next spring."
"Well, thank you Tang Gong."
Luo Yong smiled and thanked the other party.
Since the Taixue has limited student quota, and there are many people in Chang'an City watching, this matter cannot be rushed, and we have to wait for the opportunity.
Tang Jian has already agreed, and this matter will have to be handled by him sooner or later.
The transaction was established.
Luo Yongyi taught the other party the multiplication and division of vertical calculation method.
Tang Jian was already familiar with the multiplication formula and was good at arithmetic.
By this time, he had memorized the Arabic numerals from 0 to 9. , Luo Yong just arranged a few vertical poses for him to see, and the other party quickly understood what was going on.
Now it was really a treasure, especially for the calculation of division.
He simply couldn't put it down.
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He squatted there by himself, calculating over and over in front of a small blackboard, and he never got tired of doing the calculations.
It's a pity that the time is too short, they will rush back to Chang'an City soon.
Before leaving, Luo Yong gave each of them a small gift, a small blackboard with threads, which can be hung on the waist, which is unusual.
The waist card is bigger.
These small blackboards are not all black, there are also cyan and ocher ones.
The wooden boards are first dyed and then smeared with tung oil.
The front can be written with plaster, and the back is a multiplication table in Arabic.
Writing numbers and drawing tables is exactly like the multiplication table on the back of Luo Yong's pencil case when he was a child.
Early the next morning, the group set out from Xipo Village with colorful boards hanging on their waists, braving the dangers of the sky.
Luo Yong sent Tang Jian and his party to the sheepfold.
After saying goodbye, he watched them leave, then rode five pairs back to his yard slowly.
Of the two recipes given to the emperor this time, there is actually a lot of room for improvement in the cement recipe.
I wonder if the craftsmen in Chang'an City can improve the soil-cement formula to create a stronger and more durable one.
Ordinary cement and even some high-strength special cements.
If they improve it, Luo Yong will naturally have nothing to do with it.
If they don't improve it, Luo Yong still has some useful information.
There are also those rubber-soled leather boots.
Although ordinary people will definitely not be able to afford them with the current production, they will eventually become different in the future as time goes by.
In earlier times, when linen first appeared, not everyone could afford it.
At this time, although the lives of ordinary people are still difficult, they can still wear linen clothes.
The same is true for the Eucommia rubber soles.
As more and more people plant Eucommia trees to make Eucommia gum, I believe that it will not be long before this kind of shoe soles become popular.
Although the process of making rubber is cumbersome, it is not the same as growing hemp and weaving.
Compared with the process of cloth, it is nothing.
Luo Yong returned to his courtyard, entered his room, walked to a pottery urn by the wall, opened a grate randomly placed on it, and then pushed aside a layer of fine sand at the mouth of the urn, and saw the pottery urn below.
Layer of dark brown seeds.
Originally, the leaves of Duzhong trees were not mainly used for gum production.
The most gum-containing material was the bark.
In later generations, during production, seeds were mostly used for sowing.
After two or three years of planting, the entire sapling was cut down.
Peel the leaves and prepare Eucommia gum.
Among the saplings Luo Yong bought in the spring, some of them were older and had already produced some seeds this year.
When harvesting leaves in autumn, Luo Yong carefully collected these seeds and used them in the next spring. sowing.
I believe that in a few years, the Du species saplings on the slope will begin to produce seeds on a large scale.
By then, Luo Yong will not be able to use them all, so he will naturally have to sell them for money.
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